Using Test Chart Patents (Class 348/188)
  • Publication number: 20100201809
    Abstract: To provide highly accurate calibration method or the like for use with a distance measuring device which provides captured images with significant lens aberration.
    Type: Application
    Filed: May 19, 2009
    Publication date: August 12, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Ichiro Oyama, Norihiro Imamura
  • Publication number: 20100194886
    Abstract: A camera calibration device performs camera calibration for projecting a plurality of camera images from a plurality of cameras onto a predetermined surface to combine them on the basis of the results after calibration patterns to be arranged in a common photographing area of the cameras are photographed by each of the cameras. The camera calibration device judges where or not the calibration patterns are observed by the cameras on the basis of the photographed results. If judging that the calibration patterns are not observed, the camera calibration device creates the content of an instruction to contain the calibration patterns in the common photographing area to allow the cameras to observe the contained calibration patterns on the basis of the photographed results and notifies the instruction content to an operator who is in charge of the arrangement operation of the calibration patterns.
    Type: Application
    Filed: September 24, 2008
    Publication date: August 5, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Keisuke Asari, Yohei Ishii
  • Patent number: 7746457
    Abstract: The present invention provides a light quantity measuring apparatus capable of properly measuring, in short time, light to be measured whose quantity fluctuates periodically. Charges generated and stored in photodiodes during a measurement period are read in a plurality of times. A control unit obtains pixel data according to quantity of the charges generated and stored by the photodiodes in a plurality of storage periods obtained by dividing a measurement period. Further, the control unit adds up the plurality of pieces of pixel data, and calculates pixel data according to the quantities of charges generated and stored by the photodiodes in the measurement period.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: June 29, 2010
    Assignee: Konica Minolta Sensing, Inc.
    Inventors: Kiyoshi Imai, Makoto Takahashi, Shinji Shimizu
  • Publication number: 20100134634
    Abstract: An image processing system includes a camera, an image processor and a calibration surface. The calibration surface includes thereon a calibration pattern, the calibration pattern comprising a plurality of alternately coloured elements which provide a corresponding plurality of corners at locations on the calibration pattern at which more than two of the coloured elements adjoin. The corner locations define a first group of lines and a second group of lines, the lines in each of the group of lines are parallel with respect to each other and with respect to the calibration surface. The first group of lines is orthogonal to the second group of lines and the camera is operable to generate and communicate to the image processor a video signal representative of a scene as viewed by the camera, the scene including the calibration surface.
    Type: Application
    Filed: September 11, 2009
    Publication date: June 3, 2010
    Applicant: SONY CORPORATION
    Inventor: Sarah Elizabeth WITT
  • Patent number: 7728883
    Abstract: A method for enabling an output device to emulate colors of a target camera includes the following steps: (a) utilizing the target camera to shoot a color chart to obtain a first plurality of output values respectively corresponding to a plurality of color patches of the color chart, (b) utilizing the output device to shoot the color chart to obtain a second plurality of output values respectively corresponding to the plurality of color patches of the color chart, (c) comparing the first plurality of output values with the second plurality of output values to deduce a color transform matrix, and (d) applying the color transform matrix in an image processing pipeline of the output device to enable the output device to emulate colors of the target camera.
    Type: Grant
    Filed: August 14, 2006
    Date of Patent: June 1, 2010
    Assignee: Primax Electronics Ltd.
    Inventor: Wei Hsu
  • Patent number: 7692700
    Abstract: A method used for the compensation of vignetting in digital cameras has been achieved. The compensation for vignetting is done in two steps. The first step is done during production of the camera unit and involves taking and analyzing an image of a test screen, preferably a gray test screen. This results in a set of e.g. 5×5 coefficients describing a polynomial surface. The second step is done for each image that is taken by the camera and involves calculating and applying a gain-table based on polynomial coefficients to all pixels of the image to compensate vignetting.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: April 6, 2010
    Assignee: Digital Imaging Systems GmbH
    Inventors: Anders Johannesson, Ingemar Larsson
  • Patent number: 7671891
    Abstract: Online camera calibration methods have been proposed whereby calibration information is extracted from the images that the system captures during normal operation and is used to continually update system parameters. However, such existing methods do not cope well with structure-poor scenes having little texture and/or 3D structure such as in a home or office environment. By considering camera families (a set of cameras that are manufactured at least partially in a common manner) it is possible to provide calibration methods which are suitable for use with structure-poor scenes. A prior distribution of camera parameters for a family of cameras is estimated and used to obtain accurate calibration results for individual cameras of the camera family even where the calibration is carried out online, in an environment which is structure-poor.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: March 2, 2010
    Assignee: Microsoft Corporation
    Inventors: Andrew Fitzgibbon, Antonio Criminisi, Srikumar Ramalingam
  • Patent number: 7656425
    Abstract: A method characterizes field of view (FOV) distortion and may correct machine vision measurements accordingly. A plurality of distorted images are acquired, with the same calibration target at a plurality of spaced-apart locations within the FOV. The method analyzes the images and determines distortion parameters that can correct the distortions in the images such that features included in the calibration target pattern achieve a sufficient or optimum degree of congruence between the various images. Distortion parameters may be determined for each optical configuration (e.g., lens combination, magnification, etc.) that is used by a machine vision inspection system. The distortion parameters may then be used to correct FOV distortion errors in subsequent inspection and measurement operations.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: February 2, 2010
    Assignee: Mitutoyo Corporation
    Inventors: Joseph Daniel Tobiason, Yuhua Ding
  • Publication number: 20100020180
    Abstract: An alignment metrology and resolution measurement system concurrently determines the alignment of an imaging array in six degrees of freedom relative to an external reference frame, and further determines the resolution of the imaging array. To achieve this, an image of at least three mask patterns is projected on the imaging array. First and second positions of the imaging array relative to first and second coordinate axis of the reference frame is obtained using pixel positions of the images along the first and second axis. A first rotational position of the imaging array about a third coordinate axis is obtained using pixel positions of the images along the first and second axes. The third position and the second and third rotational positions of the imaging array about the first and second coordinate axis are determined using feature widths of focus images of the patterns and distances between the mask patterns.
    Type: Application
    Filed: July 23, 2008
    Publication date: January 28, 2010
    Applicant: Salvador Imaging, Inc.(a Delaware Corporation)
    Inventors: Henry A. Hill, David W. Gardner
  • Patent number: 7639303
    Abstract: A lens auto-focusing method in camera module testing includes the following steps: providing testing equipment including a range finder, a signal processor and a driving member; providing an imaged object (20); providing an camera module including a lens module (10) and an image sensor, the view angle and the biggest value of the modulation transfer function of the lens module are both certain values, the image (30) of the imaged object is formed in the image sensor; the imaged object and the image formed thereby in the other side of the lens module are fixed; the imaged object and the image formed in the other side of the lens module are fixed; inputting an image distance tested by the range finder into the signal processor, the signal processor calculates a displacement for the driving member; the driving member drives the lens module to a focusing point.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: December 29, 2009
    Assignee: Altus Technology Inc.
    Inventors: Yu Tai, Chien-I Chen, Hai-Hung Wen
  • Patent number: 7629998
    Abstract: A method and apparatus for measuring the performances of a camera including illumination, signal levels, signal to noise ratio, resolution, spectrum, color vectors and displaying the measured values in alphanumeric, waveforms, graphs and vectors onto a displayed scene generated by a camera under test, thereby enabling the user to better comprehend the meaning and verify the camera specifications and their fitness.
    Type: Grant
    Filed: June 23, 2005
    Date of Patent: December 8, 2009
    Assignee: Elbex Video Limited
    Inventor: David Elberbaum
  • Patent number: 7612801
    Abstract: Digital cameras are calibrated so that detailed highlights and shadows in scenes being photographed are reproduced in digital images of those scenes by calibrating holographic data obtained from target images at those scenes. In one embodiment the target image is obtained from an actual target having black and white, and optionally gray, target areas; and in another embodiment, the target image is obtained from the scene being photographed. In both embodiments, histographic data is manipulated so that shadow and highlight data spikes are automatically placed in boundary areas by automatically adjusting lens aperture and/or shutter speed prior to taking the desired photograph of the scene. The resulting photograph is adjusted for highlight and shadow details.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: November 3, 2009
    Inventor: Edward Alan Pierce
  • Patent number: 7600875
    Abstract: In a projector, CPU supplies a chart generation circuit with chart display information designating display position and display size of a chart image to be projected on a screen such that it comes within viewable ranges of phase difference sensors. For focus control, CPU sets display position near center of the screen, and designates display size regardless of distance between the projector and screen. For keystone correction, CPU designates display position and display size based on relationship among angular field of view, distance, and viewable ranges of the phase difference sensors. A superimposing circuit generates a video by superimposing a video signal with a chart image signal based on the chart display information. A display device projects the video superimposed by the superimposing circuit on the screen. CPU obtains the distance to the screen based on phase difference between reflection lights obtained by a sensor unit and corrects the video.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: October 13, 2009
    Assignee: Casio Computer Co., Ltd.
    Inventor: Hideaki Inoue
  • Patent number: 7586521
    Abstract: In one embodiment of the invention, a method is provided. The method, comprises (a) determining a white balance correction parameter for a white balance correction processing block for an image sensor, and including the white balance correction parameter in the white balance correction processing block; (b) determining a gamma correction parameter for a gamma correction processing block for the image sensor, and including the gamma correction parameter in the gamma correction processing block; and (c) determining a color correction parameter for a color correction processing block for the image sensor, and including the color correction parameter in the color correction processing block.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: September 8, 2009
    Assignee: Nethra Imaging Inc.
    Inventor: Ping Wah Wong
  • Patent number: 7570881
    Abstract: The imaging device comprises a flash light unit, an imaging unit, a memory comprising predetermined color balance parameters specific to the individual flash light unit, and an image processor to correct the image colors based on the parameters. The predetermined parameters are determined by imaging a white test target and stored into memory. The predetermined parameters are applied at a later stage for the color correction of actual images. Consistent image colors may be guaranteed in mass production of the imaging devices although the individual flash light units may have different spectral properties.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: August 4, 2009
    Assignee: Nokia Corporation
    Inventors: Mikko Perälä, Ossi Kalevo, Jyrki Huusko, Janne Tamminen
  • Patent number: 7570282
    Abstract: A system of correcting for color filter array by correcting for a plurality of colors in the color filter array. A color correction matrix is formed which corrects each color for a plurality of desired characteristics simultaneously. These desired characteristics can include, for example, all 24 colors in a chromaticity chart. An additional aspect includes weighting the more important colors relative to the less important colors.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: August 4, 2009
    Assignee: Aptina Imaging Corporation
    Inventor: Michael Kaplinsky
  • Patent number: 7557826
    Abstract: A method and system are provided for approximating spectral sensitivities of a particular image sensor, the image sensor having a color filter array positioned over the image sensor. In one example of the method, the method involves measuring spectral sensitivities of a set of image sensors each having a color filter array positioned over the image sensor, calculating mean spectral sensitivities of the set of image sensors for each color within the color filter array, measuring outputs of a particular image sensor when capturing a picture of a plurality of color patches under a first illuminant and calculating spectral sensitivities of the particular image sensor using the mean spectral sensitivities and the output of the particular image sensor. In some embodiments, the method further comprises utilizing the calculated spectral sensitivities to determine outputs of the particular image sensor under a second illuminant.
    Type: Grant
    Filed: April 4, 2006
    Date of Patent: July 7, 2009
    Assignees: Sony Corporation, Sony Electronics Inc.
    Inventors: Alexander Berestov, Ted J Cooper, Kenichi Nishio, Farhan A. Baqai
  • Publication number: 20090161945
    Abstract: Disclosed is a method of determining at least one three-dimensional (3D) geometric parameter of an imaging device. A two-dimensional (2D) target image is provided having a plurality of alignment patterns. The target image is imaged with an imaging device to form a captured image. At least one pattern of the captured image is compared with a corresponding pattern of the target image. From the comparison, the geometric parameter of the imaging device is then determined. The alignment patterns include at least one of (i) one or more patterns comprising a 2D scale and rotation invariant basis function, (ii) one or more patterns comprising a 1D scale invariant basis function, and (iii) one or more patterns having a plurality of grey levels and comprising a plurality of superimposed sinusoidal patterns, the plurality of sinusoidal patterns having a plurality of predetermined discrete orientations.
    Type: Application
    Filed: November 21, 2008
    Publication date: June 25, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: David Morgan-Mar, Stephen James Hardy, Matthew R. Arnison, Kieran Gerard Larkin, Christine Anne Deller
  • Patent number: 7545421
    Abstract: An apparatus, system, and method provide optimization of color space conversion using a joint quality metric representing differences between reference human visual representations and converted device captured image representations in a perceptual uniform color space, where the conversion includes transforming a nonstandard color space (RGB) to a perceptual standard color space (sRGB) and where the joint quality metric includes a color portion, a noise portion, and a contrast portion. An optical sensor produces a digital reference signal when capturing an image of a reference source such as a Macbeth ColorChecker color rendition chart. After white balancing and color correcting the digital reference signal, the gamma curve parameters are determined by minimizing the joint quality metric which is based on differences, within a uniform perceptual color space such as CIELAB, between the gamma curve compensated signal and the standard values for the reference source.
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: June 9, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Shuxue Quan, Andrew Chinchuan Chiu, Xiaoyun Jiang
  • Patent number: 7536094
    Abstract: A focus detection apparatus having a first focus detection unit and a second focus detection unit of a scheme differing from that of the first focus detection unit, for detecting the shift amount of a focal position by the first and second focus detection units, includes (a) an instruction unit capable of instructing a detection mode for detecting the shift amount, and (b) an image producing unit, when given the instructions for the detection mode from the instruction unit, for producing an object image.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: May 19, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takashi Ichimiya
  • Patent number: 7486309
    Abstract: A test system for digital camera modules used in consumer electronics, e.g. cellular phones and PDA's is shown. The test system comprises of a tester and a module handler that is aimed at reducing test time by an order of magnitude. The Test system has an image-processing unit that uses N-parallel processor to reduce the computation time on a test image by approximately the number of parallel processors. The handler is controlled by the tester to select, focus and test small digital camera modules. There are two test stations in the handler, where a first test station performs tests on a first camera module while a second test station is loaded with a second camera module, thus burying the loading time within the test time.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: February 3, 2009
    Assignee: Digital Imaging Systems GmbH
    Inventors: Horst Knoedgen, Dirk Huettmann
  • Patent number: 7479982
    Abstract: A device for measuring data for calibration for obtaining data for calibration of a camera 2 capable of varying its optical conditions, wherein the data for calibration are obtained using a plurality of images of a calibration chart 1 having marks arranged thereon which were photographed with the camera 1 under varied optical conditions, comprising: a mark extracting part 131 for extracting the marks from the images of the chart; an internal parameter calculating part 134 for calculating data for calibration under optical conditions under which the images of the chart were photographed based on the positions of the marks extracted by the mark extracting part and a plurality of conditions under which the images of the chart were photographed; and an internal parameter function calculating part 160 for calculating data for calibration corresponding to the varied optical photographing conditions of the camera 2, using the data for calibration calculated in the internal parameter calculating part and a plurality
    Type: Grant
    Filed: July 3, 2003
    Date of Patent: January 20, 2009
    Assignee: Topcon Corporation
    Inventors: Hitoshi Otani, Nobuo Kochi, Takayuki Noma
  • Patent number: 7477838
    Abstract: A Light box for optical module test is disclosed. The light box is designed to have at least a light source, a beam splitting unit, an optical filtering module and two optical fibers. The optical filtering module is formed with a plurality of filters and arranged between the light source and the beam splitting unit to generate a variety of color temperatures of the light beam from the light source before the light beam enters the beam splitting unit. Thereafter, the light beam is uniformly divided by the beam splitting unit into a first light beam and a second light beam which are transmitted via the optical fibers, respectively, and projected onto a test chart.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: January 13, 2009
    Assignee: UMA Technology Inc.
    Inventor: Chang Yuan Lee
  • Patent number: 7444071
    Abstract: A digital image processing method for a centralized multi-mode medical tongue image inspection system, comprising the steps of: forming at least one service unit (300) for performing tongue record (220) construction; forming a processing unit (320) for tongue record inspection (308); and providing communication links (330) between the service units and the processing unit.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: October 28, 2008
    Assignee: Carestream Health, Inc.
    Inventor: Shoupu Chen
  • Publication number: 20080192120
    Abstract: A security camera and an image, within the camera's field of view, of a test pattern, containing color elements and grayscale elements having know predetermined spectrophotometrical values and resolution elements. After taking of images at a scene, and when subsequently reproduced accurately the elements will produce electronic signals that are detectable on measuring equipment well-known to the trade, such as vectorscopes and waveform monitors. Adjustments and corrections can then be made to the images of a scene, based on those readings. A method of adjusting and correcting images using the test pattern is also disclosed.
    Type: Application
    Filed: February 13, 2007
    Publication date: August 14, 2008
    Inventor: Ferrand D. E. Corley
  • Patent number: 7405816
    Abstract: An improved test target pattern that can be used in the testing of image quality for digital images taken with a camera module, the camera module either being a stand-alone product or being incorporated into a device such as a mobile telephone. With the present invention, several different image quality aspects can be monitored and measured using a single test pattern. Previously, multiple test patterns would have had to have been used for such a task.
    Type: Grant
    Filed: October 4, 2005
    Date of Patent: July 29, 2008
    Assignee: Nokia Corporation
    Inventor: Harri J. Ojanen
  • Patent number: 7376345
    Abstract: This invention relates to an apparatus and method to permit a photographer to take accurate portraiture pictures. There is provided a camera reference device for adjusting the settings on a camera comprising a reference member with qualitative indicia for determining picture sharpness and colour for adjusting the settings on the camera and which allows for the taking of a picture of the face and head of the subject within the same photographic image beside the reference member. Using the device, there is provided a method of taking a photographic image comprising: taking a picture of the subject in combination with an apparatus comprising a reference member with qualitative indicia for determining photographic image qualities for adjusting the settings on the camera and which allows for the taking of a picture of the face and head of the subject within the same photographic image beside the reference member.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: May 20, 2008
    Inventor: Ferrand David Ernest Corley
  • Publication number: 20080088704
    Abstract: A novel method of calibrating digital photographs providing accurate planimetry measurements of objects within digital image 12 is disclosed herein. Digital image 12 is imported into a computer program where a calibration method is performed using calibration line 20 that is dragged and dropped to ruler 10 in digital image 12. The novel method provides users with a method to perform a number of accurate planimetry measurements including linear measurements 44 & 46, total surface area 24 along with sub area measurements 50, 52, 54, 56, and circumferential 66 measurements. In addition volume 42 measurement can be calculated and associated with various area parameters 50, 52, 54, 56, when various depth parameters 58, 60, 62, 64 are provided.
    Type: Application
    Filed: October 15, 2007
    Publication date: April 17, 2008
    Inventors: Martin Edmund Wendelken, Ronald Arpino
  • Publication number: 20080062266
    Abstract: A method for testing an image capture device. The method for testing an image capture device comprises providing an image test board printed with at least two positioning marks and at least one test pattern, the at least one test pattern being positioned in a coordinate system defined by the at least two positioning marks, capturing a test image of the image test board with the image capture device, locating the at least two positioning marks in the test image to find the coordinate system, and analyzing the at least one test pattern in the test image in accordance with the coordinate system to verify the quality of the image capturing device.
    Type: Application
    Filed: September 12, 2006
    Publication date: March 13, 2008
    Applicant: MEDIATEK INC.
    Inventors: Jia-Yang Chang, Chao-hsiung Su
  • Patent number: 7307654
    Abstract: An image capture and viewing system is disclosed. In one embodiment, the present invention provides an image capture system for providing an image of a subject. The image capture system includes a planar surface, a first camera, a second camera and a control module. The first camera is positioned to capture a first subject image of a subject positioned between the planar surface and the first camera. The second camera is spaced from the first camera. The second camera is positioned to capture a second subject image of the subject. The control module is configured to generate a synthesized image of the subject from a virtual view point using the relative positioning of the first camera, the second camera, and a planar surface.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: December 11, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Nelson Liang An Chang
  • Patent number: 7304663
    Abstract: Resolution of an image capture system is measured by imaging a test target having a progression of feature sizes and pitch in respective sub-fields thereof. The image captured by the imaging system is then inspected to determine a sub-field image which does not include aliasing in the form of a Moire' pattern. Inclusion of reference numerals corresponding to the sub-field image feature size and pitch allows direct reading of the resolution of the imaging system. Such a system enables fast and accurate determination of the resolution and alignment of an imaging system using an inexpensively produced test target together with an arbitrary image viewing program.
    Type: Grant
    Filed: August 4, 2005
    Date of Patent: December 4, 2007
    Assignee: Lockheed Martin Corporation
    Inventor: Lawrence E. Albertelli
  • Publication number: 20070268378
    Abstract: A method for enabling an output device to emulate colors of a target camera includes the following steps: (a) utilizing the target camera to shoot a color chart to obtain a first plurality of output values respectively corresponding to a plurality of color patches of the color chart, (b) utilizing the output device to shoot the color chart to obtain a second plurality of output values respectively corresponding to the plurality of color patches of the color chart, (c) comparing the first plurality of output values with the second plurality of output values to deduce a color transform matrix, and (d) applying the color transform matrix in an image processing pipeline of the output device to enable the output device to emulate colors of the target camera.
    Type: Application
    Filed: August 14, 2006
    Publication date: November 22, 2007
    Inventor: Wei Hsu
  • Patent number: 7292266
    Abstract: An image evaluation chart and a method for testing performances of the video equipment using the same. The image evaluation chart includes a resolution inspection area. The resolution inspection area includes a center point located at a center part of the chart, a regular-squared outer line located at outside of the center point, and a plurality of resolution measurement lines symmetrically arranged at right and left sections and upper and lower sections on the basis of the center point. Therefore, the image evaluation chart accurately and efficiently tests all performances, for example, resolution, balance, view angle, distortion, and focus, etc., of video equipment such as a camera by means of one-shot image capture, and provides users with reliable test data.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: November 6, 2007
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Kyoung-Tai Lee, Hyeong-Jin Yun
  • Patent number: 7265781
    Abstract: Color correction matrix determining method and apparatus and image photographing method and apparatus are used in a color processing system that converts input image data into output image data and has two color correction matrixes that are a first matrix and a second matrix, with a white balance correction circuit being sandwiched between the first matrix and the second matrix. The color correction matrix determining method and apparatus input a light source range and determines the first matrix based on this inputted light source range on the occasion of determining the color correction matrix in the color processing system. The image photographing method and apparatus discriminates a photographing light source range and determines the first matrix based on the discriminated photographing light source range.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: September 4, 2007
    Assignee: Fujifilm Corporation
    Inventor: Takafumi Noguchi
  • Patent number: 7248284
    Abstract: Calibration targets for use with digital cameras comprise black and white target areas to which digital cameras are exposed simultaneously to provide proper settings for highlight and shadow sensitivity prior to making a digital photograph. In addition a white or gray neutral target area, without color bias, is provided, to which the digital cameras are exposed to provide desired settings for color balance prior to making digital photographs. In one embodiment of the calibration target, the black and white target areas are on one side of a panel and the white or gray neutral target area is on the other side of the panel. In accordance with methods of calibrating digital cameras and to methods of photography, the image of the black and white target areas is adjusted by viewing a histogram display thereof and adjusting exposure settings until spikes in the histogram representing black and white detection are equally balanced between boundaries with no lateral offset.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: July 24, 2007
    Inventor: Edward Alan Pierce
  • Patent number: 7248287
    Abstract: In a test method in which an image photographed by a camera apparatus 1 attached to a body of a vehicle is displayed on a display device 17 and an examiner examines compliance or non-compliance of the shooting direction of the camera apparatus 1 by comparing the position of a reference pattern and the position of a judgment pattern on the displayed photographed image, the photographed image is obtained at first by photographing with the camera apparatus 1 a test chart which is placed at a predefined position ahead of the vehicle with the reference pattern drawn on the test chart. Next, the judgment pattern is set at a specific position on the photographed image. Then, the photographed image on which the judgment pattern has been set is displayed on the display device 17.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: July 24, 2007
    Assignee: Fuji Jukagyo Kabushiki Kaisha
    Inventors: Yoshiyuki Sogawa, Keiichi Murakami, Yoshio Tozawa
  • Patent number: 7200497
    Abstract: A test system for testing a portable electronic apparatus is described. The test system has at least a display, a platform, and a controller. The controller controls the display to display test images in sequence. The controller commands the portable electronic apparatus, via a test interface, to capture the test images on the display to generate image data. The controller determines whether the image data meet a predetermined test requirement. The test system can further include at least a light source and a reflector. The reflector reflects the light on the display, so that the display reaches a predetermined uniformity of light.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: April 3, 2007
    Assignee: Quanta Computer Inc.
    Inventors: Chih-Cheng Wang, Hung-Yang Wu, Chuan-Hung Chiang
  • Patent number: 7084905
    Abstract: Disclosed are method and apparatus for obtaining relatively high dynamic range images using a relatively low dynamic range image sensor without significant loss of resolution. The image sensor has an array of light-sensing elements with different sensitivity levels in accordance with a predetermined spatially varying sensitivity pattern for the array of light-sensing elements. An image of a scene is captured with the image sensor and stored as brightness values at respective pixel positions in a linear or two-dimensional uniform grid. The brightness values of the captured image at the pixel positions are then used to estimate the brightness values at off-grid positions of a uniform off-grid array located at respective interstices of the pixel position grid.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: August 1, 2006
    Assignees: The Trustees of Columbia University in the City of New York, Sony Corporation
    Inventors: Shree K. Nayar, Tomoo Mitsunaga
  • Patent number: 7071966
    Abstract: A method for aligning a lens of a camera with a sensor of the camera. The method includes positioning a test object a predetermined distance away from the lens of the camera, photographing the test object with the camera to produce image data, and outputting the image data from the camera to a calibration device. The method also includes dividing the image data into a plurality of sections, calculating resolution data for at least two sections of the image data, calculating position parameters of the lens according to the resolution data, and correcting alignment of the lens with respect to the sensor according to the position parameters.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: July 4, 2006
    Assignee: BenQ Corporation
    Inventors: Jih-Yung Lu, Chih-Po Yang, Chih-Ching Chen
  • Patent number: 7068302
    Abstract: A method for testing cameras includes positioning a camera such that an image of a target is displayed on a monitor within at least one default image parameter. The method further includes engaging a dimming condition of a light source from the camera, thereby generating a lighting condition signal. Subsequently the camera receives the lighting condition signal and displays it on the monitor. A group of observers then analyze the lighting condition signal. The method continues through engaging a second dimming condition of the light source from the first camera, thereby generating a second lighting condition signal, which is also displayed on the monitor. The group of observers then analyzes the second lighting condition signal.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: June 27, 2006
    Assignee: Ford Global Technologies, LLC
    Inventors: Samuel Edward Ebenstein, James Stewart Rankin, II, Gregory H. Smith, Yelena Mordechai Rodin, David Bednarz, Thomas Meitzler
  • Patent number: 7057641
    Abstract: A color measurement device comprising a means for electronically recording a digital color image, a target holder extending from the recording means having a distal end, and a target at the distal end of the holder, the target having one or more reference color regions thereon.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: June 6, 2006
    Assignee: Color Savvy Systems Limited
    Inventors: Gary Bodnar, Christopher Pearson, Karl F. Seibert, Michael J. Vrhel
  • Patent number: 7023472
    Abstract: An imaging device is calibrated using a flat, featureless surface and uniform illumination, relying on the effect of off-axis illumination and vignetting on the reduction of light into the camera at off-axis angles. The effect of the tilt of the camera is also considered. These effects are used to extract intrinsic camera parameters including focal length, principal point, aspect ratio and skew.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: April 4, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sing Bing Kang, Richard S. Weiss
  • Patent number: 6992696
    Abstract: Resolution of an image capture system is measured by imaging a test target having a progression of feature sizes and pitch in respective sub-fields thereof. The image captured by the imaging system is then inspected to determine a sub-field image which does not include aliasing in the form of a Moire' pattern. Inclusion of reference numerals corresponding to the sub-field image feature size and pitch allows direct reading of the resolution of the imaging system. Such a system enables fast and accurate determination of the resolution and alignment of an imaging system using an inexpensively produced test target together with an arbitrary image viewing program.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: January 31, 2006
    Assignee: Lockheed Martin Corporation
    Inventor: Lawrence E. Albertelli
  • Patent number: 6987533
    Abstract: A reference device for setting color biasing mechanisms on a camera and achieving a consistent color biasing in different environmental situations, and a method of making the same. The reference device comprises a reflective media having a surface that has had its spectral characteristics analyzed and its surface treated with colored droplets, wherein each of the droplets is less than 5 picoliters in volume, to achieve a degree of desired white neutrality or color bias of different spectral quality than that which was analyzed as aforesaid.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: January 17, 2006
    Inventor: Ferrand David Ernest Corley
  • Patent number: 6987529
    Abstract: A camera of this invention is a camera containing a shake correction device for correcting the shake by reading out application voltage data corresponding to a detected shake amount by use of parameters stored in an EEPROM indicating the relation between a voltage applied to a wedge prism and a deflection angle of a light beam and applying a voltage subjected to the temperature correcting process to the wedge prism to change the index of refraction of the wedge prism and deflect the light beam in a direction opposite to the shake direction.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: January 17, 2006
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Junichi Ito
  • Patent number: 6985183
    Abstract: The present invention is a method for exploring the viewpoint and focal length of a fisheye lens camera (FELC). It employs the characteristic of the central symmetry of the distortion of the fisheye lens (FEL) to set its optic axis by means of a calibration target with a plurality of symmetrically homocentric figures. Once the optic axis is fixed, further disclose the viewpoint (VP) of the FELC along the optic axis through a trail-and-error procedure and calculate its effective focal length and classify it to the primitive projection mode. Because the invention is capable of finding out both the internal and external parameters of the FELC and the calibration method is easy, low-cost, suitable to any projection model, and has greater sensitivity corresponding to an increasing in image distortion, the distortive images can be transformed easily to normal ones which fit in with a central perspective mechanism.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: January 10, 2006
    Assignee: APPRO Technology Inc.
    Inventors: Gwo-Jen Jan, Chuang-Jan Chang
  • Patent number: 6980231
    Abstract: A color reproduction system includes a tristimulus value calculation unit for calculating tristimulus values (X, Y, Z) under observation illumination light corresponding to the spectral reflectance of an object, which is obtained by a spectral reflectance calculation unit, and a color image signal calculation unit for calculating output color image signals (R?, G?, B?) to a CRT monitor on the basis of the tristimulus values (X, Y, Z). The tristimulus value calculation unit converts spectral reflectance image data (F) of the object into tristimulus value image data (X, Y, Z) under the observation illumination light using the spectral reflectance data of a color chip formed from a plurality of unit color chips, color chip image data (P?) obtained by sensing the color chip with a digital camera under the observation illumination light, spectral sensitivity data of the digital camera, and color matching function data.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: December 27, 2005
    Assignee: Olympus Corporation
    Inventor: Kenro Ohsawa
  • Patent number: 6961086
    Abstract: A photographing apparatus provided with a picture-taking device which photographs a subject, includes a transmission type chart to be attached to the photographing apparatus and having at least a chromatic color portion; a storage device which stores a color reproduction target value for the chromatic color portion of the chart; and a correction device which corrects a color correction coefficient of image data obtained by photographing by the photographing apparatus, on the basis of image data obtained by photographing an achromatic color portion of a subject by the picture-taking device through the chromatic color portion of the chart and on the basis of the color reproduction target value stored in the storage device.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: November 1, 2005
    Assignee: Fuji-Photo Film Co., LTD
    Inventor: Koji Ichikawa
  • Patent number: 6941012
    Abstract: When information is received specifying a desired product and a desired light source type, e.g. a type of a light source used in an environment in which the product, if purchased, would actually be used, a server device provides a color reproducing correction process for original image data obtained by shooting the desired product. Specifically, component data corresponding to a color of the light source at shooting and that corresponding to a color of the light source of the desired type are used to correct original image data to attain image data obtained when the product is shot under the desired light source type. The data obtained by the correction is transmitted to a consumer terminal and displayed on a screen. The consumer confirms the displayed image, and if satisfied with e.g. how the product would present color, the process moves on to an on-line transaction process for product purchasing.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: September 6, 2005
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Misao Takano, Kazuomi Hatanaka, Masayuki Ehiro, Teruaki Morita
  • Patent number: 6915072
    Abstract: A finder apparatus which is used together with a photographing apparatus presents a marker for positioning for setting relative positions of the photographing apparatus and an object for calibration so as to be visually recognizable by an operator in a finder configured to present an image of a subject so as to be visually recognizable by the operator, when photographing the object for calibration including at least one of a known shape and a known surface attribute in order to acquire parameters of a photographing optical system of the photographing apparatus.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: July 5, 2005
    Assignee: Olympus Corporation
    Inventors: Kazuhiko Takahashi, Akio Kosaka, Kazuhiko Arai, Takashi Miyoshi, Hidekazu Iwaki