Including Flicker Detection (e.g., Fluorescent) Patents (Class 348/226.1)
  • Patent number: 11381796
    Abstract: Provided herein is an image-sensing device and a method for auto white balance. An image signal processor is used to perform the method. In the method, an RGBIr photo sensor receives an image with data over red, green and blue channels. The image data over the red, green and blue channel is firstly restored. A series of weights are calculated according to the image data over an infrared channel. The weights are allocated to the image data so as to adjust the infrared ratios over the red, green and blue channels for reducing infrared effect on auto white balance. After that, an infrared weighting calculation is performed for adjusting the infrared values over the red, green and blue channels of the image. A set of white balance gains are obtained. An auto white balance is performed for obtaining a new image with infrared crosstalk compensation.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: July 5, 2022
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Ching-Ju Hsiao, Wen-Tsung Huang
  • Patent number: 11284023
    Abstract: In an imaging apparatus as an embodiment, a drive unit drives pixels so that a photoelectric conversion unit alternately performs accumulation of charges in a first exposure period and accumulation of charges in a second exposure period having different length from the first exposure period. A control unit performs a first exposure in a first cycle and performs a second exposure in second cycle when a result of detection indicates that a subject is not blinking. Further, the control unit performs a first exposure in a cycle different from the first cycle when the result of detection indicates that the subject is blinking.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: March 22, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shinji Yamanaka, Hisashi Takado
  • Patent number: 11212459
    Abstract: Systems and methods for imaging scenes illuminated by light sources that are powered by alternating current. Data concerning these light sources are extracted from the imagery. Systems comprising a rolling shutter imaging sensor and configured to de-flicker images with spatial flicker are also provided.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: December 28, 2021
    Assignees: TECHNION RESEARCH & DEVELOPMENT FOUNDATION LIMITED, THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO
    Inventors: Mark Sheinin, Yoav Schechner, Kiriakos Neoklis Kutulakos, Yoash Levron
  • Patent number: 11176868
    Abstract: Disclosed is a method for driving a display. The method includes calculating differences between digital codes corresponding to grayscale voltages each provided to pixels connected to the same data line and gate lines which are sequentially driven, summing digital code differences of a threshold value or more, generating a compensation code corresponding to the summation result, and providing grayscale voltages compensated with the compensation code to pixels of which digital codes have a difference of less than the threshold value.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: November 16, 2021
    Assignee: Anapass Inc.
    Inventors: Joon Bae Park, Jun Young Jang, Hyun Seung Lee, Dong Joon Lee
  • Patent number: 11172143
    Abstract: This invention enables one to check flicker of a HFR image signal. A display image signal of a first frame rate for flicker check is obtained on the basis of an image signal of a second frame rate. For example, the display image signal of the first frame rate is generated from the image signal of the second frame rate by a frame thinning process. In this case, a frame to be thinned is determined from a relationship between the second frame rate and a light source frequency. For example, the number of frames to be a flicker period is obtained from the second frame rate and the light source frequency, and the frame to be thinned is determined so that continuous frames of the number of frames to be the flicker period are present.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: November 9, 2021
    Assignee: SONY CORPORATION
    Inventor: Sohhei Okada
  • Patent number: 11172151
    Abstract: An image capture apparatus comprising a plurality of pixels, each pixel having a light-receiving circuit that outputs a pulse signal in response to incidence of a photon and a counting circuit configured to count the pulse signal, is disclosed. The image capture apparatus further comprises a detection circuit that detects whether or not a flickering light source is present in a field of view, based on an output frequency of the pulse signal.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: November 9, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoshi Suzuki, Nobuhiro Takeda
  • Patent number: 11144762
    Abstract: There is provided with an image processing apparatus. A target image including an object, for a predetermined imaging range, is obtained. A background image, which is obtained from a selected image selected from a captured image for the predetermined imaging range based on brightness of the target image, is obtained. A region of the object in the target image based on the background image is obtained.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: October 12, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tomoyori Iwao
  • Patent number: 11102423
    Abstract: An image pickup apparatus includes an image pickup device that picks up a subject by driving by a rolling shutter method, a memory that stores a set of instructions and at least one processor that executes the instructions to divide, when driving the image pickup device at a second frame rate lower than a first frame rate, a plurality pieces of image data successively acquired by the image pickup device at the second frame rate into predetermined areas to acquire data of divided areas, and perform flicker detection using a predetermined number of pieces of the data of the divided areas successive for a plurality of frames.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: August 24, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Kohei Ota
  • Patent number: 11039081
    Abstract: There is provided an image sensor for exposing a plurality of pixel rows within a frame period using a rolling shutter. The image sensor includes a processor for calculating bright-dark distribution patterns of image frames. The processor further adjusts the frame period to be substantially identical to a predetermined period by changing a total number of exposed line times within the frame period when a difference between the bright-dark distribution patterns of two image frames is larger than a predetermined threshold.
    Type: Grant
    Filed: July 17, 2019
    Date of Patent: June 15, 2021
    Assignee: PIXART IMAGING INC.
    Inventor: Wen-Han Yao
  • Patent number: 11032486
    Abstract: Techniques and apparatuses are described for reducing a flicker effect of multiple light sources in an image captured with an imaging device. A lighting frequency associated with each of the multiple light sources is detected and prioritized relative to a flicker effect upon the image to identify at least a first-prioritized lighting frequency and a second-prioritized lighting frequency. A first exposure-time factorization set is determined for the first-prioritized lighting frequency, and a second exposure-time factorization set is determined for the second-prioritized lighting frequency. An exposure time of the imaging device is adjusted to an exposure time identified in the first exposure-time factorization set that matches, or aligns near-to-matching, an exposure time identified in the second exposure-time factorization set.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: June 8, 2021
    Assignee: Google LLC
    Inventors: Gang Sun, Jinglun Gao, Ruben Manuel Velarde, Szepo Robert Hung
  • Patent number: 10972677
    Abstract: An imaging control apparatus includes: a flicker detecting section configured to detect a flicker component of a light source, the flicker component being included in an image; and a controlling section configured to control timing of imaging according to a detection result by the flicker detecting section, in which the controlling section controls the timing of the imaging according to timing of a peak or a bottom of the flicker component detected.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: April 6, 2021
    Assignee: SONY CORPORATION
    Inventors: Yutaro Honda, Satoko Suzuki
  • Patent number: 10944912
    Abstract: Systems, methods, and computer-readable media are disclosed for reducing flickering artifacts in imaged light sources. Example methods may include receiving images corresponding to a scene captured by a camera; determining a light source in the scene using at least one artificial intelligence (AI)-based algorithm; determining, using an event-based camera, data representing flickering of the light source, the flickering having a frequency; determining, based on the data, that a time duration of overlap between an on state of the light source and an exposure time of the camera is below a threshold; and delaying the exposure time of the camera by a delay time to increase the time duration of overlap.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: March 9, 2021
    Assignee: Ford Global Technologies, LLC
    Inventor: David Michael Herman
  • Patent number: 10911644
    Abstract: This application provides an image processing method and an image collection device. A haze intensity of a first image is calculated. When the haze intensity of the first image is greater than a first threshold, control information is sent, where the control information is used to control a haze penetration optical component to move into a lens. Because the haze penetration optical component can improve quality of optical imaging, the lens into which the haze penetration optical component is moved has a function of optical haze penetration. It can be learned that, when the haze intensity of the first image is greater than the first threshold, the function of the optical haze penetration is enabled, so as to improve quality of an image obtained in a haze environment.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: February 2, 2021
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Liyu Zhu, Peng Xu, Binbin Zhou
  • Patent number: 10848684
    Abstract: Provided is an imaging control device including a control unit and a flickering correction unit. The control unit adjusts a parameter of a correction signal for correcting a flickering component included in a captured image before imaging of the captured image starts. The flickering correction unit corrects the flickering component included in the captured image based on the parameter of the correction signal after adjustment.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: November 24, 2020
    Assignee: SONY CORPORATION
    Inventor: Keisuke Nakajima
  • Patent number: 10805548
    Abstract: The present technology relates to a signal processing apparatus, an imaging apparatus, and a signal processing method capable of reliably imaging a blinking imaging target in a scene having a very large difference in brightness. By detecting a difference between a plurality of images captured with different exposure times, calculating a combination coefficient indicating a combination ratio between the plurality of images on the basis of the difference, and combining the plurality of images on the basis of the combination coefficient, it is possible to reliably image a blinking imaging target in a scene having a very large difference in brightness. The present technology can be applied to, for example, a camera unit that captures an image.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: October 13, 2020
    Assignee: Sony Semiconductor Solutions Corporation
    Inventors: Makoto Koizumi, Masakatsu Fujimoto, Ikko Okamoto, Daiki Yamazaki, Yasushi Shibata
  • Patent number: 10798298
    Abstract: In one embodiment, a computing system receives one or more signals indicative of light intensities captured by one or more cameras. These signals are captured in a plurality of frames at a first frame rate. The computing system calculates light intensity metrics for each frame of the plurality of frames based on the one or more signals captured in the respective frames. The computing system detects one or more peaks based on the light intensity metrics associated with one or more frames of the plurality of frames. The one or more frames were captured in a predetermined time period. The computing system determines a likelihood of perceptible flicker based on the detected one or more peaks. The computing system causes the one or more cameras to capture frames at a second frame rate in response to a determination that the likelihood of perceptible flicker exceeds a predetermined threshold.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: October 6, 2020
    Assignee: Facebook Technologies, LLC
    Inventor: Mariano Jos Jaimez Tarifa
  • Patent number: 10771713
    Abstract: An imaging control device including: a control unit configured to perform control such that an exposure timing is synchronized with a timing of a peak of a detected flickering component on a basis of a period of the flickering component and the timing of the peak of the flickering component.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: September 8, 2020
    Assignee: SONY CORPORATION
    Inventors: Satoko Suzuki, Yutaro Honda, Syouei Hirasawa, Osamu Izuta, Daisuke Kasai
  • Patent number: 10755429
    Abstract: Methods and apparatuses in which a plurality of images are recorded at different illumination angles are provided. The plurality of images are combined in order to produce a results image with an increased depth of field.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: August 25, 2020
    Assignee: Carl Zeiss Microscopy GmbH
    Inventors: Lars Stoppe, Lars Omlor
  • Patent number: 10735669
    Abstract: A method for reducing artefacts caused by the presence of flicker during image capture. The method comprises performing image capture to produce image capture data corresponding to an image capture scene, the image capture data including a first image having a first exposure and a second image having a second exposure. The image capture data is processed to: (a) detect a discrepancy in the second image with respect to the first image; and (b) determine flicker indication data indicative of a presence of flicker in the second image. The discrepancy is corrected in dependence upon the flicker indication to produce a flicker-reduced version of the second image.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: August 4, 2020
    Assignee: Apical Ltd.
    Inventors: Andrew Dewhurst, David Hanwell
  • Patent number: 10721416
    Abstract: An imaging device includes an imaging unit, a sensor, and a controller. The imaging unit sequentially outputs a digital image by capturing a subject. The sensor includes a photoelectric element for receiving a part of luminous flux from the subject incident on the imaging unit. The sensor detects an AC current component of the luminous flux from the luminous flux received by the photoelectric element. The controller detects a flicker cycle in the luminous flux from the AC current component.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: July 21, 2020
    Assignee: Olympus Corporation
    Inventors: Keiji Kunishige, Masashi Takahashi
  • Patent number: 10708515
    Abstract: An imaging apparatus has a first mode in which a detection unit detects a light amount change characteristic from an object between first and second exposures of an imaging unit during a continuous shooting and a determination unit determines an exposure timing of the second exposure based on the detected light amount change characteristic.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: July 7, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Naoyuki Nakagawara
  • Patent number: 10609300
    Abstract: An image sensor comprises an image sensing array on a semiconductor substrate for image sensing. The image sensor comprises a plurality of first light sensing units arranged in an array. A light sensor, disposed on the semiconductor substrates for sensing ambient light and converting the ambient light into a first electrical signal comprises a plurality of second light sensing units arranged in an array. A processing module may be connected to one or more light sensing units and may be configured to determine the intensity of the ambient light based on the first electrical signal and control the operation of the image sensor based on the determined intensity.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: March 31, 2020
    Assignee: HUAIAN IMAGING DEVICE MANUFACTURER CORPORATION
    Inventors: Xinhe Feng, Shaw-Tzeng Hsia, Jianguang Chang, Yonggang Wang
  • Patent number: 10607575
    Abstract: A novel display system is provided. The display system includes a display portion and a control portion. The control portion includes a controller and a memory device. The display portion has a function of displaying an image. The controller has a function of outputting a signal for controlling a refresh rate of the image. The memory device has a function of storing data including data indicating a recognition state of the image and data on whether a flicker is recognized in the recognition state by a user or not. The controller has a function of changing the refresh rate of the image with reference to the data stored in the memory device when data on whether a flicker is recognized or not is input by the user.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: March 31, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yuji Iwaki, Hideaki Okamoto
  • Patent number: 10587817
    Abstract: Disclosed is an electronic device including an image sensor including a lens, a pixel array configured to convert light collected through the lens into an electric signal and to output the electric signal, a readout circuit configured to convert electric signals sequentially received for each row of the pixel array into pixel data and to output the pixel data, a memory, and a controller configured to control the pixel array, the readout circuit and the memory, and a processor electrically connected to the image sensor. The controller is configured to generate a frame by integrating the pixel data sequentially received from the readout circuit, generate a profile regarding flickering of the collected light using the generated frame and another frame generated prior to the generated frame, and store the generated profile in the memory, obtain a profile set including profiles corresponding to a plurality of frames from the memory, and transfer the generated frame and the obtained profile set to the processor.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: March 10, 2020
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Dongsoo Kim, Hwayong Kang, Eunsoo Chang, Minkyu Park, Minyoung Park, Youngkwon Yoon, Hyeoncheol Jo, Jonghoon Won
  • Patent number: 10547794
    Abstract: A solid-state imaging apparatus includes: a pixel unit (1) configured to perform imaging of a plurality of frames by a photoelectric conversion; an exposure amount calculating unit (9) configured to calculate exposure amounts of the plurality of frames imaged in a flicker cycle of a light source; and a control unit (12) configured to control the exposure amount of each of the frames imaged by the pixel unit based on the exposure amounts of the plurality of frames calculated by the exposure amount calculating unit.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: January 28, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shintaro Takenaka, Kazuhiro Sonoda
  • Patent number: 10496864
    Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: December 3, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-Uk Jeon, Sun-Kwon Kim, Seung-Hoon Lee
  • Patent number: 10432875
    Abstract: An image processing apparatus includes: a row integration ratio calculation unit that divides a first row integration value by a second row integration value for each row, to calculate a row integration ratio; a reference value generation unit that generates a reference value for each row; a reference value integration unit that multiplies the integration ratio by the reference value for each row and integrates multiplication results corresponding to all rows, to calculate a sum of the multiplication results of the integration ratios and the reference values; a flicker parameter estimation unit that estimates a flicker parameter of flicker generated in the first exposure image on the basis of the sum; and a flicker correction unit that corrects the flicker generated in the first exposure image on the basis of the estimated flicker parameter. The present disclosure can be applied to an image sensor.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: October 1, 2019
    Assignee: SONY CORPORATION
    Inventors: Shigeki Nakamura, Shun Kaizu
  • Patent number: 10425583
    Abstract: An imaging device captures an object. The imaging device includes: an imaging unit that captures the object and outputs video data; a memory unit that stores therein the video data from the imaging unit; a video signal processing unit that reads the video data from the memory unit at a frame rate lower than a frame rate at which the video data are written into the memory unit and performs signal processing on the video data; an output interface unit that outputs to an external device the video data; and a control unit that outputs to the imaging unit an instruction to capture the specific number of frames and to write video data into the memory unit as an exposure period signal, instructs the video signal processing unit to output the video data from the memory unit, and outputs to the external device an imaging period signal.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: September 24, 2019
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Tomoya Ohsawa
  • Patent number: 10412336
    Abstract: This video signal processing apparatus includes a luminance correction circuit that multiplies video signals of M sequential frames by weight coefficients individually set for frames respectively ordered in the M frames, M being plural, and adds and averages results, to generate a correction video signal of a frame in a predetermined order in the M frames, a value of a weight coefficient set for the frame in the predetermined order being set to be maximum among values of the weight coefficients individually set for the frames respectively ordered in the M frames.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: September 10, 2019
    Assignee: SONY CORPORATION
    Inventor: Sohhei Okada
  • Patent number: 10313616
    Abstract: An image sensor includes first pixels and second pixels arranged in alternating order along a first direction, first output lines extending in a second direction that is perpendicular to the first direction and respectively connected to the first pixels, second output lines extending in the second direction and respectively connected to the second pixels, first analog circuit blocks and second analog circuit blocks arranged in alternating order along the first direction, and shielding structures disposed each between adjacent ones of the first and second analog circuit blocks. Each of the first analog circuit blocks includes a plurality of first analog circuits respectively connected to the first output lines. Each of the second analog circuit blocks includes a plurality of second analog circuits respectively connected to the second output lines.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: June 4, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yunhwan Jung, Sunyool Kang, Kyoungmin Koh, Seungjin Lee
  • Patent number: 10264201
    Abstract: Provided is a solid-state image pickup apparatus which includes a plurality of groups, each including an output line to which the pixel signals are output from pixels in a corresponding column and an AD conversion unit configured to perform AD conversion on the pixel signals output to the output line for some of the plurality of rows to generate a digital signal. An adjustment period for ensuring a difference in length between a first horizontal period and a second horizontal period and executing an operation of the AD conversion unit is set in a period excluding a period from first timing at which the output of the pixel signals to the output line starts, to second timing at which the AD conversion unit starts the AD conversion.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: April 16, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masami Iseki, Kazuhiro Sonoda
  • Patent number: 10257430
    Abstract: An image processing technique that enables accurate detection of a flicker component even when applied to an image pickup device capable of changing a driving method on a region basis within a frame. A flicker detection section detects a flicker component of an image pixel signal read out from the image pickup device having a pixel region for detecting a phase difference. When the driving method is changed to one for performing phase difference detection, the flicker detection section detects a flicker component such that the period of the flicker component in a region used for phase difference detection within the frame coincides with a period of the flicker component in a region not used for phase difference detection.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: April 9, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yusuke Yamashita
  • Patent number: 10244183
    Abstract: [Object] To easily determine whether a flicker component is present. [Solution] An image sensor performs a process of generating image data by exposing a plurality of lines, each of which including a plurality of pixels, in sequence over a predetermined exposure time from exposure start timings that are different from each other whenever a predetermined period of a vertical synchronization signal elapses. A timing controller performs control for shifting each of the exposure start timings by a fixed time interval whenever the period elapses. A determination unit determines whether a component having luminance varying at a predetermined frequency along a direction perpendicular to the plurality of lines in the image data is present. A removal unit removes the component in the image data in a case where the component is determined to be present.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: March 26, 2019
    Assignee: Sony Corporation
    Inventor: Ryuichi Tadano
  • Patent number: 10244159
    Abstract: In an image capturing apparatus, an image sensing unit has a plurality of pixels and photoelectrically converts an object image formed by an optical imaging system including a focus lens and outputs an electrical image signal, a control unit controls at least a readout rate or an exposure condition independently for different regions of the image sensing unit, and a calculation unit calculates a plurality of focus evaluation values based on image signals read out from the pixels present in a focus detection area in one of the plurality of different regions at different focus lens positions, and find an in-focus position of the focus lens based on the focus evaluation values. The control unit takes an image signal read out from a first region among the plurality of different regions as an image signal for display.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: March 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuki Konishi, Naoki Iwasaki, Akiko Wada
  • Patent number: 10237492
    Abstract: An image sensor circuit includes an image sensor, a flicker detector and a flicker compensator. The image sensor generates frame data for a plurality of successive frames. The flicker detector determines a representative value of the frame data for each of the plurality of successive frames and generates a flicker detection signal that is activated when the determined representative values of the generated frame data show periodicity between a minimum value and a maximum value. The flicker compensator generates compensated frame data by compensating the frame data based on the determined representative values and a predetermined reference value when the flicker detection signal is activated.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: March 19, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Yo-Hwan Noh
  • Patent number: 10212344
    Abstract: Included are a photometric unit configured to obtain respective photometric values of a plurality of photometry areas in an image capturing area, an operation unit configured to perform setting regarding continuous shooting and/or focus adjustment, a calculation unit configured to calculate a light quantity change characteristic of a photometric target based on the photometric values of the plurality of photometry areas, an adjustment unit configured to adjust exposure timing based on the light quantity change characteristic, and a control unit configured to change a method of calculating the light quantity change characteristic according to the setting regarding continuous shooting and/or focus adjustment, and to determine whether the exposure timing is adjusted based on the light quantity change characteristic.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: February 19, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Toshifumi Osawa
  • Patent number: 10205886
    Abstract: There is provided an imaging apparatus that can obtain a satisfactory image under a flickering light source while preventing lowering of a frame speed during consecutive image capturing. The imaging apparatus includes an image capturing unit, an acquisition unit to acquire information about a periodic change in light intensity from a subject, and a control unit to control exposure timing of the image capturing unit to the light. The control unit may control the exposure timing so that the image capturing unit is exposed in synchronization with a timing at which the light intensity from the subject becomes a first light intensity based on the acquired information. A period at or during which the light intensity from the subject becomes the first light intensity may be shorter than a change period of the light intensity from the subject based on the acquired information.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: February 12, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yasuhiro Harada
  • Patent number: 10158811
    Abstract: Provided is an image processing apparatus for correcting blinking defect noise included in image data generated by an image sensor, the image sensor including pixels arranged two-dimensionally and read-out circuits configured to read out a pixel value. The image processing apparatus is configured to: acquire noise information that associates the pixel value with positional information of the read-out circuits or positional information of each of the pixels, and with feature data related to blinking defect noise attributed to the read-out circuits; determine whether the blinking defect noise occurs on a pixel of interest based on the noise information; calculate candidate values indicating a correction amount for correcting the blinking defect noise based on the noise information and a pixel value of the pixel of interest if the blinking defect noise occurs; and correct the pixel value of the pixel of interest based on the candidate values.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: December 18, 2018
    Assignee: OLYMPUS CORPORATION
    Inventors: Manabu Ichikawa, Hiroki Maruyama
  • Patent number: 10129449
    Abstract: A flash band determination device capable of always detecting a flash band with high accuracy, and correcting the detected flash band. It is determined whether or not there is a high-luminance area in an image, which is an area having a luminance level exceeding a predetermined luminance level. When determining whether or not a flash band which is an area having a luminance level higher than a predetermined threshold level is present in a difference image which is a difference between two images which are continuously obtained, if it is determined that the high-luminance area is present, whether or not the flash band is present is determined, by excluding an area corresponding to the high-luminance area, as a determination excluded area, from the difference image.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: November 13, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takenori Kobuse
  • Patent number: 10126632
    Abstract: Provided are an imaging apparatus, a flicker detection method, and a flicker detection program that can accurately detect a flicker even in a case in which an image of a bright object is captured. A digital camera directs a MOS imaging element 5 to perform a plurality of imaging operations at an arbitrary frame rate and compares captured image signals which are read from the imaging element 5 for frame periods F1 and F2 based on the frame rate to detect whether a flicker has occurred. The end time of a signal reading period in the frame period F1 is before the end time of the frame period F1 and the end time of a signal reading period in the frame period F2 coincides with the end time of the frame period F2.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: November 13, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Yoshinori Furuta
  • Patent number: 10122937
    Abstract: A method of processing an image obtained by a camera includes: obtaining the image using an image sensor; identifying an image signal in a direction perpendicular to a line scan direction of the image sensor, with respect to at least one region of the image; detecting a signal indicating a flicker, using the image signal; and generating an image in which a flicker is corrected, based on the signal indicating a flicker and the image.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: November 6, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-jun Yu
  • Patent number: 10104308
    Abstract: An image capturing apparatus comprises an image sensor, a driving unit configured to drive the image sensor, and a detection unit configured to detect a variation in amount of light within one frame image based on a plurality of image signals obtained by driving the image sensor with different accumulation periods by the driving unit.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: October 16, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Nakaoka
  • Patent number: 10104309
    Abstract: An imaging apparatus includes: an imaging element; an imaging element driving unit that directs the imaging element to alternately perform imaging operations at a first frame rate and a second frame rate being different from the first frame rate; and a flicker detection unit that detects whether a first flicker of a light source with a first frequency is present and whether a second flicker of a light source with a second frequency is present, based on a first captured image signal obtained by an imaging operation at the first frame rate and a second captured image signal obtained by an imaging operation at the second frame rate as defined herein, and a sum of a duration of a first frame period based on the first frame rate and a duration of a second frame period based on the second frame rate is a value as defined herein.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: October 16, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Tatsuo Onodera
  • Patent number: 10057501
    Abstract: An imaging apparatus includes: an imaging element; an imaging element driving unit that directs the imaging element to alternately perform imaging operations at a first frame rate and a second frame rate being different from the first frame rate; and a flicker detection unit that detects whether a first flicker of a light source with a first frequency is present and whether a second flicker of a light source with a second frequency is present, based on a captured image signal obtained by an imaging operation at the first frame rate, a captured image signal obtained by an imaging operation at the second frame rate following the imaging operation at the first frame rate and a captured image signal obtained by an another imaging operation at the first frame rate or the second frame rate, wherein the first frame rate and the second frame rate are as defined herein.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: August 21, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Tatsuo Onodera
  • Patent number: 10027857
    Abstract: A method for detecting electronic lighting flickering includes: taking a video of an electronic light with a duration of a predetermined period and a scanning frequency; extracting a predetermined number of frames of pictures from the video; determining a flickering frequency of the electronic light; determining at least one fixed reference point at each frame; and reconstructing a brightness waveform of the electronic light from the reference point in all frames of the video.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: July 17, 2018
    Assignee: Gean Technology Co. Limited
    Inventors: Shan Mei Wan, Po Shu Bruce Lam, Chi Keung Yeung
  • Patent number: 10009547
    Abstract: An image pickup apparatus which is capable of properly detecting and compensating for flash bands to generate a corrected image with no different levels of luminance. Based on an image signal output from an image pickup device which sequentially starts exposure and reads out signals for each row of pixels, a flash band appearing in a plurality of frames consecutive in terms of time due to an external flash is detected. Gains are changed with rows of the frames. At least one of the frames in which the flash band was detected is corrected to a full-screen flash image. When flash bands caused by a plurality of external flashes fired in one frame is detected, a gain is calculated based on a light quantity ratio between the external flashes, and a region where the flash bands overlay each other is multiplied by the gain to generate the full-screen flash image.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: June 26, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kouji Kubota
  • Patent number: 9979898
    Abstract: An imaging apparatus equipped with a flicker detection function and including an image sensor of a rolling shutter type calculates a Fourier spectrum including an amplitude and a phase for each of two captured images acquired by the image sensor and having different imaging timings by performing Fourier spectrum analysis based on a flicker period serving as a detection target, and judges that flicker with the flicker period serving as the detection target has occurred, when the amplitude of a calculated Fourier spectrum and the phases of the two Fourier spectrums satisfy predetermined conditions and a sum of squares of a pixel value difference between the two captured images for each pixel is larger than a predetermined sum of squares.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: May 22, 2018
    Assignee: CASIO COMPUTER CO., LTD.
    Inventor: Takeshi Tsukagoshi
  • Patent number: 9912878
    Abstract: A flicker detection apparatus and method where flickers in the video images are detected based on the mean detection values obtained from pairs of neighboring frames in the current frame and the former n frames, which is able to perform flicker detection efficiently, and the detection results are accurate.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: March 6, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Jianrong Wu
  • Patent number: 9900092
    Abstract: A coded light component is modulated into emitted light on one of multiple channels each having a different modulation frequency. Modulation in the light causes a receiving camera to experience an apparent temporal frequency due to sequential capture of multiple frames and an apparent spatial frequency due to sequential exposure of spatial portions within each frame. Each channel can be detected by a detection module of the camera based on a respective combination of values of the apparent temporal and spatial frequency corresponding to the respective modulation frequency. The detection module has a respective response on each channel that varies as a function of the apparent temporal frequency. The channel for modulating the coded light component is selected from amongst a predetermined set having a property that the response of the detection module on each channel will have a minimum substantially at the apparent temporal frequency of each other channel.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: February 20, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Frederik Jan De Bruijn, Stephanus Joseph Johannes Nijssen
  • Patent number: 9794491
    Abstract: An imaging apparatus has a first mode in which a determination unit determines an exposure timing of an imaging unit based on a timing calculated by a calculation unit after a light metering unit performs light metering a first number of times, and a second mode in which the determination unit determines the exposure timing of the imaging unit based on the timing calculated by the calculation unit after the light metering unit performs the light metering a second number of times.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: October 17, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Naoyuki Nakagawara