Using Test Chart Patents (Class 348/188)
  • Patent number: 6901219
    Abstract: The present invention is in the technical field of image digitizers or scanners. It relates to a method and device that enables the automatic calibration of digitizing equipment. The method and device of the invention enable the auto-calibration of a digitizing device by taking into account sensitometric data specific to a film strip to be digitized, to automatically adjust the digitizing parameters of the digitizing device, according to these sensitometric data and without operator intervention. The application field of the invention more especially relates to the users of digitizing equipment dedicated to motion picture films.
    Type: Grant
    Filed: December 5, 2002
    Date of Patent: May 31, 2005
    Assignee: Eastman Kodak Company
    Inventor: Thierry Prigent
  • Patent number: 6859224
    Abstract: It is an object of the invention to measure the precise color characteristic of an image pickup machine and accurately reproduce a subject in an image display unit. A color characteristic measurement apparatus which has a test chart (1) as a subject of an image pickup machine (6), a hole (2) made in the test chart (1), a black box (3) placed on a rear face of the test chart (1) and formed on an inner surface in black, and a light output section (4) placed in the black box (3) at a position where the light output section (4) can be observed through the hole (2) from the outside.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: February 22, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Sugiura, Tetsuya Kuno, Junichiro Hayashi, Kiyotaka Yamamoto, Yoshikuni Nishimura
  • Publication number: 20040252195
    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: Application
    Filed: June 13, 2003
    Publication date: December 16, 2004
    Inventors: Jih-Yung Lu, Chih-Po Yang, Chih-Ching Chen
  • Publication number: 20040212680
    Abstract: The invention is concerned with a device for determining an intensity and/or color and/or sharpness profile in each case of an optical lens system (3), which projects a test pattern (1) consisting of measuring fields (5), wherein the projection is directed indirectly or directly in each case toward a sensor area (6) of electronic color and brightness sensors of high resolution, whose measured signals, which are correlated to the measuring fields (5), are sent to a computer (60), which determines from these the intensity and/or color and/or sharpness profile and/or distortion propagation profile, outputs them to an image processing system (62) for an electronic image flaw correction of images (B) that were generated by an identical lens system (3), and stores them or temporarily stores them on a data carrier (61).
    Type: Application
    Filed: June 14, 2004
    Publication date: October 28, 2004
    Inventors: Sebastia Wernher Schroeder, Detlef Grosspietsch, Wilfried Donner, Christian Wohler
  • Publication number: 20040189805
    Abstract: An electronic camera can be reprogrammed, recalibrated or optimized for a given application or environment by a remote expert who does not have to be present locally. The camera requires a bi-directional data path to the expert, preferably using the internet, for writing parameters into the camera's program memory and for reading its acquired images. The remote expert must be capable of presenting selected visual stimuli to the camera, which are presented by a suitable image presentation device to the camera, under remote control by the expert. Thanks to the invention, a recalibration of the camera is more simple, faster, at lower costs and independent of the location of the camera user.
    Type: Application
    Filed: April 8, 2004
    Publication date: September 30, 2004
    Applicant: CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA
    Inventor: Peter Seitz
  • Publication number: 20040179101
    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: Application
    Filed: December 15, 2003
    Publication date: September 16, 2004
    Inventors: Gary Bodnar, Christopher Pearson, Karl F. Seibert, Michael J. Vrhel
  • Patent number: 6785403
    Abstract: An optical axis direction, a distance measurement accuracy and so on are efficiently performed for quality assurance of a vehicle-mounted camera in cooperation of an image processing unit and a vehicle-mounted navigation control unit. In a vehicle monitoring system for imaging view ahead of the vehicle with the camera (2a, 2b) installed in the vehicle body and for recognizing a running condition with the image processing unit (20), the image processing unit measures an optical axis direction and a distance measurement accuracy to determine whether the camera quality is appropriate or not for quality assurance of the vehicle-mounted camera. The determined result is displayed on a monitor (52) of the vehicle mounted navigation control unit (5) to recommend adjustment of the camera.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: August 31, 2004
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Keiichi Murakami, Noriyuki Miyazawa
  • Patent number: 6734899
    Abstract: The gray balance of an input signal produced when a gray chart is read by a digital camera is adjusted by a color processor. Thereafter, a color chart is read by the digital camera, and color correction functions in the color processor are corrected so that chromaticities of an output signal with the adjusted gray balance will be in conformity with the chromaticities of the color chart.
    Type: Grant
    Filed: August 13, 1998
    Date of Patent: May 11, 2004
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takahiro Okamoto
  • Patent number: 6724423
    Abstract: A video camera system capable of matching colors between configured video cameras by effectively reducing color differences therebetween. A red, a green and a blue signal from imaging devices are amplified by preamplifiers and video amplifiers before being fed to a color matching circuit. The color matching circuit performs color matching in accordance with the levels of the red, green and blue signals using variables of gains and DC offset values. The gains and DC offset values are determined by the color matching circuit executing predetermined operation expressions. With a plurality of colors imaged in advance by the video cameras to be matched in color with a reference video camera, necessary coefficients of the operation expressions are obtained by use of the level measurements (tristimulus values) of the red, green and blue signals from an integrating circuit of each camera.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: April 20, 2004
    Assignee: Sony Corporation
    Inventor: Fumihiko Sudo
  • Publication number: 20040070669
    Abstract: In an image output calibrating system for cameras, a camera is supported so as to be directed at a plurality of different angles, and a light source is placed in front of the camera. A control unit associates the pan and tilt angles of the camera with corresponding positions of an image of the light source on the imaging device so that the relationship between each point on the object and the corresponding point on the image of the object formed on the imaging device of the camera can be identified.
    Type: Application
    Filed: July 11, 2003
    Publication date: April 15, 2004
    Inventor: Chiaki Aoyama
  • Publication number: 20040066454
    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: Application
    Filed: July 3, 2003
    Publication date: April 8, 2004
    Applicant: TOPCON CORPORATION
    Inventors: Hitoshi Otani, Nobuo Kochi, Takayuki Noma
  • Publication number: 20040032496
    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: Application
    Filed: August 15, 2002
    Publication date: February 19, 2004
    Applicant: Ford Global Technologies, Inc.
    Inventors: Samuel Edward Ebenstein, James Stewart Rankin, Gregory H. Smith, Yelena Mordechai Rodin, David Bednarz, Thomas Meitzler
  • Publication number: 20040027456
    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: Application
    Filed: August 8, 2003
    Publication date: February 12, 2004
    Inventor: Edward Alan Pierce
  • Patent number: 6654048
    Abstract: The calibration of an imaging system having a camera (20) for capturing colour data for a target object (carcass 10) includes a primary calibration to obtain a primary transform for RGB data to enable compensation for variations in the camera operation or characteristics, and a secondary calibration obtain a secondary transform to enable compensation for local lighting conditions during capture and processing of colour data for captured images to be analysed. The calculated primary transform relates the actual measured colour data to known standard colour data for the particular standard colour specimens (31). The standard colour specimens (31) are presented in an enclosure or hood (30) to the camera under controlled illumination and with extrancous or external light being excluded from illuminating the specimens. A preliminary calibration includes calibrating the primary calibration standard colour specimens and associated controlled light source against centralised laboratory standard colours.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: November 25, 2003
    Assignee: Meat & Livestock Australia Limited
    Inventors: David Barrett-Lennard, Lachlan Partington, Emlyn Garvey, Kurt Malmstrom
  • Patent number: 6633330
    Abstract: It is an object of the invention to measure the precise color characteristic of an image pickup machine and accurately reproduce a subject in an image display unit. A color characteristic measurement apparatus which has a test chart (1) as a subject of an image pickup machine (6), a hole (2) made in the test chart (1), a black box (3) placed on a rear face of the test chart (1) and formed on an inner surface in black, and a light output section (4) placed in the black box (3) at a position where the light output section (4) can be observed through the hole (2) from the outside.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: October 14, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Sugiura, Tetsuya Kuno, Junichiro Hayashi, Kiyotaka Yamamoto, Yoshikuni Nishimura
  • Patent number: 6628329
    Abstract: Images are sharpened and corrected for position dependent blur by providing a sharpening function which is adapted to operate upon signals corresponding to a selected number of pixels, providing a plurality of values which are a function of the position dependent blur; and applying the plurality of values to the sharpening function to modify the sharpening function so that after the modified sharpening function is applied to the image, a sharpened image will be provided which has been corrected for the position dependent blur.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: September 30, 2003
    Assignee: Eastman Kodak Company
    Inventors: Sean C. Kelly, Donald R. Williams, David W. Jasinski
  • Publication number: 20030160877
    Abstract: An imaging device installed on an autonomously movable body which comprises an image-taking section for taking images of the surrounding environment, and an object detecting section for detecting objects and obstacles by processing the obtained images. The imaging device comprises: an image processing section to perform color detection of the images taken by the image-taking section; a white calibration plate for the image-taking section to perform color correction; and a calibration plate control section for moving the calibration plate into a field of view of the image-taking section, wherein it is determined whether color information which is sufficient to perform color detection is obtainable from the images taken by the image-taking section, and color correction is performed using the calibration plate when it is determined that the images taken by the image-taking section do not provide color information sufficient to perform color detection.
    Type: Application
    Filed: January 23, 2003
    Publication date: August 28, 2003
    Inventor: Naoaki Sumida
  • Publication number: 20030156194
    Abstract: It is an object of the invention to measure the precise color characteristic of an image pickup machine and accurately reproduce a subject in an image display unit.
    Type: Application
    Filed: February 27, 2003
    Publication date: August 21, 2003
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Sugiura, Tetsuya Kuno, Junichiro Hayashi, Kiyotaka Yamamoto, Yoshikuni Nishimura
  • Patent number: 6560410
    Abstract: A camera section photographs a camera test chart. A calibration controller of the camera section reads out image data of the camera test chart, and executes calibration of the camera section by use of characteristic values of obtained image data and standard data, which is stored in an internal memory. Next, a printer test chart, printed by a printer section, is photographed by the calibrated camera section. Image data of the printer test chart is sent to the printer section from the camera section. A calibration controller of the printer section performs calibration of the printer section by use of characteristic values of obtained image data and standard data, which is stored in an internal memory. By calibrating both the camera and the printer sections, it is possible to execute effective calibration of the apparatus.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: May 6, 2003
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koji Ichikawa, Makoto Tsugita, Tetsuro Ashida
  • Patent number: 6542185
    Abstract: An image of an optical target including dark and light monochromatic patches is captured. An average YUV value is calculated from a predetermined number of YUV values for each monochromatic patch. A white balance is performed using the averaged YUV values and a predetermined reference image. Each averaged YUV value is converted to an equivalent RGB value. A difference in RGB values between the light and the dark monochromatic patches produces a dynamic range for the RGB values. The dynamic range for the G value is adjusted to match the dynamic range for a G′ value of the predetermined reference image.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: April 1, 2003
    Assignee: Intel Corporation
    Inventor: David W. Bogardus
  • Publication number: 20030007077
    Abstract: A calibration system activates all or a majority of a display with the same value, such as with the same color. The camera is pointed at the display, but doesn't have to precisely pick up the whole display. The computer compares the pixel information received in the camera photosensor, and can store an appropriate correction factor. Not only does the user not have to precisely position the camera, jitter due to use hand movement is not a problem since this smoothes out the color information from the various pixels on the display, and actually improves the calibration. A target can be provided on the display to indicate if the user is properly pointing the camera at the display.
    Type: Application
    Filed: July 9, 2001
    Publication date: January 9, 2003
    Applicant: Logitech Europe S.A.
    Inventor: Sergio Maggi
  • Patent number: 6462777
    Abstract: A color display characteristic measurement apparatus is provided with a first image pickup device for picking up an image of a first color component, a second image pickup device for picking up an image of a second color component, a measurement image generator for causing a color display apparatus to display a measurement image thereon, the measurement image being displayed in a single color to which both the first image pickup device and the second image pickup device are sensible, and a calculator for calculating, based on a first picked-up image of the first image pickup device and a second picked-up image of the second image pickup device, calibration data for calibrating a relative displacement between the first and second image pickup devices.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: October 8, 2002
    Assignee: Minolta Co., Ltd.
    Inventor: Kenji Hamaguri
  • Publication number: 20020118294
    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: Application
    Filed: February 11, 2002
    Publication date: August 29, 2002
    Inventors: Misao Takano, Kazuomi Hatanaka, Masayuki Ehiro, Teruaki Morita
  • Patent number: 6437823
    Abstract: A digital camera is calibrated by establishing the coordinates of at least four feature points of a pattern mounted on a planar surface. At least two, and preferably three or more, images of the planar pattern are captured at different, non-parallel orientations using the digital camera. The image coordinates of the pattern's feature points are then identified in the captured images. A closed form solution can be employed to derive all the intrinsic and extrinsic parameters needed to provide the camera calibration. Essentially, the known pattern coordinates and corresponding image coordinates are used to compute a homography for each image. Then, a process is employed that estimates the intrinsic camera parameters by analyzing the homographies associated with each image. Finally, the extrinsic parameters for each image are computed from the intrinsic parameters and the homographies.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: August 20, 2002
    Assignee: Microsoft Corporation
    Inventor: Zhengyou Zhang
  • Patent number: 6292617
    Abstract: A system for controlling the integrity of an image recorded on a first recording medium, for example, film, and transferred to a second recording medium, for example, videotape. The system includes a control chart having a set of chart control information and a plurality of control strips each having a set of strip control information. The control chart, which is for use by a cinematographer on a set, is recordable on the film under substantially the same conditions under which the image is recorded onto the film. Each of the control strips, which are for use by a telecine colorist at a transfer machine, is formatted to correspond to a different type of commercially available film so that one of the control strips corresponds to the film on which the image is recorded. The set of strip control information on each of the control strips includes information substantially the same as information included in the set of chart control information.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: September 18, 2001
    Inventor: Yuri Neyman
  • Patent number: 6256062
    Abstract: The invention provides a technique of making color correction by means of a simple operation so that the color difference among imaging apparatus is minimized for a particular color specified by a user. In the color correction operation, an MPU provided in a camera displays a marker on a viewfinder. A user controls a user interface so as to put the marker on a desired color of a color chart thereby selecting a color to be weighted. The MPU inputs data obtained by measuring the color chart via the camera and also inputs color reference data obtained by measuring the same color chart under the same conditions via another camera serving as a reference camera. The MPU determines the coefficients of a linear matrix circuit for making color correction by means of a calculation with a weight specified by the user. The resultant coefficients are set in the linear matrix circuit.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: July 3, 2001
    Assignee: Sony Corporation
    Inventor: Kazuo Endo
  • Patent number: 6190308
    Abstract: An endoscopic video system for correcting a video image of an object to be studied has a processing unit controlling an electronic image recorder which has a multiplicity of image elements, each generating an output signal upon illuminating a known test object. The processing unit has a learning mode of operation, wherein it determines and records a correction value corresponding to a difference between an output signal of the known test object and a generated one by each of the image elements, and a recording mode, wherein an output signal generated by each image element upon illuminating an object to be studied is adjusted at the correction value.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: February 20, 2001
    Assignee: Karl Storz GmbH & Co., KG
    Inventors: Klaus Irion, Karl-Heinz Strobl, Uwe Faust, David Chatenever
  • Patent number: 6034721
    Abstract: An analysis method for cinematographic film uses a film scanner for converting the images of the film into video images, the film scanner having a calibration mode providing a standardized video reproduction of films and a manual mode allowing the operator to adjust the film scanner for improving the visual quality of the video images it produces.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: March 7, 2000
    Assignee: Aaton
    Inventors: Frederic Mangeat, Alain Bellet, Jean-Pierre Beauviala
  • Patent number: 5917987
    Abstract: A system for controlling the integrity of an image recorded on a first recording medium, for example, film, and transferred to a second recording medium, for example, videotape. The system includes a control chart having a set of chart control information and a plurality of control strips each having a set of strip control information. The control chart, which is for use by a cinematographer on a set, is recordable on the film under substantially the same conditions under which the image is recorded onto the film. Each of the control strips, which are for use by a telecine colorist at a transfer machine, is formatted to correspond to a different type of commercially available film so that one of the control strips corresponds to the film on which the image is recorded. The set of strip control information on each of the control strips includes information substantially the same as information included in the set of chart control information.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: June 29, 1999
    Inventor: Yuri Neyman
  • Patent number: 5917541
    Abstract: An input section of a color sense measuring device includes a solid-state camera image-sensing an object to be measured and a frame memory storing output information from the solid-state camera. The output information of the solid-state camera read out of the frame memory is fed to a hue/saturation/lightness transform part in a color sense measuring section for transformation into hue image information, saturation image information and lightness image information for use in measuring the color sense of the object to be measured. Based on the image information output from the color sense measuring section, a feature extract/quantification section extracts a feature value for measuring the color sense of the object and a color sense analysis section judges the color sense of the material of the object on the basis of the feature information output from the feature extract/quantification section, while at the same time the feature information is supplied to an image processing/display part for display.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: June 29, 1999
    Assignee: Advantest Corporation
    Inventors: Kouji Nakagome, Haruo Kato
  • Patent number: 5900942
    Abstract: An optical imaging system provides automatic co-registration of a plurality of multi spectral images of an object which are generated by a plurality of video cameras or other optical detectors. The imaging system includes a modular assembly of beam splitters, lens tubes, camera lenses and wavelength selective filters which facilitate easy reconfiguration and adjustment of the system for various applications. A primary lens assembly generates a real image of an object to be imaged on a reticle which is positioned at a fixed length from a beam splitter assembly. The beam splitter assembly separates a collimated image beam received from the reticle into multiple image beams, each of which is projected onto a corresponding one of a plurality of video cameras. The lens tubes which connect the beam splitter assembly to the cameras are adjustable in length to provide automatic co-registration of the images generated by each camera.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: May 4, 1999
    Assignee: The United States of America as represented by Administrator of National Aeronautics and Space Administration
    Inventor: Bruce A. Spiering
  • Patent number: 5896168
    Abstract: An apparatus and method for adjusting video characteristics of a CRT screen having a plurality of adjustment mechanisms for adjusting visual characteristics of the CRT screen. Further included is a video playback mechanism adapted to display a screen format on the CRT video screen upon the actuation thereof. The screen format comprises a plurality of areas of various colors. A viewing mechanism is included to allow viewing of the screen format of the CRT screen therethrough. Upon viewing the screen format of the CRT screen through the viewing mechanism, a user may manipulate the adjustment mechanisms for properly adjusting the visual characteristics of the CRT screen.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: April 20, 1999
    Inventor: David J. Hedwall
  • Patent number: 5821993
    Abstract: A pair of calibration algorithms are provided for calibrating a color camera in a machine vision system. The first and most general form of the calibration algorithm requires that a calibration target be shown to a well adjusted machine vision system. The calibration target contains samples of red, green and blue. A gray level histogram is taken of each of the resulting red, green and blue images and is used to generate corresponding standard cumulative probability functions. The standard cumulative probability functions, together with a copy of the calibration target, is provided to a machine vision system having its own color camera which requires calibration. The same above-noted steps are repeated for this system and the resulting cumulative probability functions are compared to the corresponding standard cumulative probability functions to obtain gains for the red, green and blue channels of the camera to be calibrated .
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: October 13, 1998
    Assignee: Medar, Inc.
    Inventor: David A. Robinson
  • Patent number: 5820547
    Abstract: A portable endoscope tester determines specific properties of an endoscope optical system and enables comparisons between individual endoscopes to be made. The tester includes a holder for receiving and aligning an endoscope and a target attachable to the holder. The target is held in a plane normal to the optical axis of the endoscope when received in the holder. Opaque indicia indicative of the optical properties of the endoscope appears on the target and include a central disk with either a pinhole or a cross formed at the center, a plurality of field circles including an inner and outer bold ring, an inner and outer group of resolution targets arranged at respective clock positions, each resolution target comprising a plurality of parallel lines of different width and spacing, and rectangular grid centered on the optical axis.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: October 13, 1998
    Assignee: Karl Storz GmbH & Co.
    Inventors: Karlheinz Strobl, Eugene A. Antoine, Jr.
  • Patent number: 5805218
    Abstract: A three-dimensional resolution chart is used to adjust the position of a solid-state image detector 4 in a given image-forming optical system. A plurality of blocks 10a are provided on an upper surface of a resolution chart 10. Each block 10a has an adjusting pattern A-D depicted on a slant surface thereof. An image of each adjusting pattern A-D is formed-on the solid-state image detector 4 through a master lens 2. The contrast integration value F is calculated based on the image of the adjusting pattern at each of a plurality of designated areas hj (j=1 - - - n) on the slant surface of each block 10a provided on the resolution chart 10, to find out a specific position on each block where the contrast integration value F becomes maximum, thereby identifying the specific position as focus point of the master lens 2. The back focus of the solid-state image detector 4 is calculated based on thus obtained focus point. An optimum gradient (.alpha., .beta.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: September 8, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kouji Ohura, Keiji Shintani, Yoko Koseki, Hiroto Toba, Toshiro Obi, Kazuyuki Kobayashi
  • Patent number: 5760829
    Abstract: A system and method allows a user to evaluate the critical optical parameters associated with an imaging device including a CCD array. The system includes a series of optical test targets. Digital images of the optical test targets are captured by the imaging device under test. The stored digital image data is automatically analyzed by a computer program which evaluates the dynamic range, contrast resolution and distortion of the imaging device. The results are compared to predetermined criteria and printed for evaluation by a user. The system provides a means for comparing and qualifying various camera systems to be used for package tracking.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: June 2, 1998
    Assignee: United Parcel Service of America, Inc.
    Inventor: John W. Sussmeier
  • Patent number: 5748230
    Abstract: A system for automatically performing the Minimum Resolvable Contrast (MRC) test on an image sensor, such as a TV camera, using a digital signal processor for controlling the testing, wherein an edge response from a square aperture target edge is used to generate a Modulation Transfer Function (MTF) which, in combination with signal and noise data obtained using the square aperture target, provides an input to automated MRC (AMRC) processing equations, from which a value can be calculated for an AMRC output. Alternatively, a slit target may be substituted for the square target aperture when measuring camera MTF.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: May 5, 1998
    Assignee: Northrop Grumman Corporation
    Inventors: Harold J. Orlando, Michael L. Pappas, Marco A. Lopez
  • Patent number: 5467128
    Abstract: A test station enables the performance of a solid state imager (herein called a focal plane array or FPA) to be determined at high image frame rates. A programmable waveform generator is adapted to generate clock pulses at determinable rates for clock light-induced charges from a FPA. The FPA is mounted on an imager header board for placing the imager in operable proximity to level shifters for receiving the clock pulses and outputting pulses effective to clock charge from the pixels forming the FPA. Each of the clock level shifters is driven by leading and trailing edge portions of the clock pulses to reduce power dissipation in the FPA. Analog circuits receive output charge pulses clocked from the FPA pixels. The analog circuits condition the charge pulses to cancel noise in the pulses and to determine and hold a peak value of the charge for digitizing. A high speed digitizer receives the peak signal value and outputs a digital representation of each one of the charge pulses.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: November 14, 1995
    Assignee: The Regents of the University of California, Office of Technology Transfer
    Inventors: George J. Yates, Kevin L. Albright, Bojan T. Turko
  • Patent number: 5453840
    Abstract: A system which uses a random noise test target 16 to align sensors 10 and 12 by performing mathematical cross correlations between sensors 10 and 12. The system 48 includes a computer 58 rotating one of the images, computing a correlation between the rotated image and a reference image and determining the peak in the correlation. A global maximum is used to interpolate a true subpixel peak. The interpolated rotational cross correlation peak is used to determine values of two dimensional and rotational movement of one of the sensors 10 and 12 necessary to align the sensors. The values are used to move the sensor 10 or 12 and it is fixed in place. Once the sensors have been aligned and fixed in place, the system 118 computes the cross correlation of segments of the image to determine delay values and an interpolation filter coefficient values which are stored in a permanent storage device 120.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: September 26, 1995
    Assignee: Eastman Kodak Company
    Inventors: Martin A. Parker, Kenneth A. Parulski
  • Patent number: 5404164
    Abstract: A color TV convergence measurement device and process for measuring a position of an electron beam of a multiple-beam color picture tube relative to a field of view of an image converter, in which an electron beam generation system provides the electron beam which generates a brightness distribution pattern on a screen of a tube, the screen has phosphor stripes for different colors, and a shadow mask is arranged in front of the screen and has elongated slots in the direction of the phosphor stripes.
    Type: Grant
    Filed: June 8, 1993
    Date of Patent: April 4, 1995
    Assignee: Nokia Technology GmbH
    Inventors: Joachim Hassler, Zeljko Sernhorst, Gunter Wessels
  • Patent number: 5371538
    Abstract: A quality assurance standard for a video composite image has a target 10 with indicia 30 and a moveable flap 18 for casting a shadow 15 onto the indicia 30 in order to control the pedestal of an image captured by a video camera 2.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: December 6, 1994
    Assignee: Eastman Kodak Company
    Inventor: Nancy J. Widger
  • Patent number: 5327226
    Abstract: In an automatic color-balance setup system for a color TV camera, a chart board having a white pattern, a black pattern and a gray pattern is imaged by the color TV camera for the purpose of color balance adjustment. The image signal data appearing at the output of the TV camera are analyzed to compute and determine the white level, the black level and the gray level, and the locations of the image signal data corresponding to the individual levels, measurement regions for the white level, the black level and the gray level are automatically determined color balance automatic setup.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: July 5, 1994
    Assignee: Hitachi Denshi Kabushiki Kaisha
    Inventor: Kazuhiro Tanabe