Patents by Inventor Leung Chun Chan
Leung Chun Chan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220294964Abstract: The present disclosure relates to a low-light autofocus technique. One example embodiment includes a method. The method includes receiving an indication of a low-light condition for a camera system. The method also includes determining an extended exposure time for a low-light autofocus procedure of the camera system. Further, the method includes capturing, by the camera system, an extended frame for the low-light autofocus procedure. The extended frame is captured by die camera system using the determined extended exposure time. In addition, the method includes determining, based on the captured extended frame, an in-focus lens setting for a lens of the camera system.Type: ApplicationFiled: October 11, 2019Publication date: September 15, 2022Inventors: Ying Chen Lou, Leung Chun Chan, Kiran Murthy, Qiurui He, Szepo Robert Hung, Sushil Nath
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Patent number: 10325354Abstract: A method and apparatus for determining an auto white balance (AWB) gain based on determined depth information. The method may include receiving an image captured by an image sensor, determining depth information associated with the captured image, assigning weights to a plurality of illuminants based on the determined depth information, determining an auto white balance gain based on the assigned weights and statistics of the captured image, and applying the auto white balance gain to the captured image.Type: GrantFiled: April 28, 2017Date of Patent: June 18, 2019Assignee: QUALCOMM IncorporatedInventors: Ying Xie Noyes, Kyuseo Han, Ho Sang Lee, Hengzhou Ding, Leung Chun Chan, Loic Francois Segapelli
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Patent number: 10230888Abstract: An apparatus includes an initializer configured to adjust one or more settings of a camera prior to initialization of the camera. The one or more settings are adjusted based on an indication of motion detected using at least one measurement performed by a sensor device. The apparatus further includes a processing device configured to execute a camera application to initialize the camera after adjustment of the one or more settings.Type: GrantFiled: July 31, 2015Date of Patent: March 12, 2019Assignee: QUALCOMM IncorporatedInventors: Ying Chen Lou, Ruben Velarde, Sanket Krishnamurthy Sagar, Hengzhou Ding, Liang Liang, Leung Chun Chan
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Publication number: 20180359465Abstract: Aspects of the present disclosure relate to systems and methods for calibrating a flash for image capture. An example method may include receiving, from a camera, a first image of a scene captured with a first flash light source emitting light with a first color temperature and with a second flash light source emitting light with a second color temperature different from the first color temperature. The first flash light source and the second flash light source may be derived based on a first flash calibration setting of a number of stored flash calibration settings. The example method may also include determining a difference between a desired color characteristic for the first flash calibration setting and a color characteristic of the first image. The example method may further include adjusting the first flash calibration setting based on the determined difference.Type: ApplicationFiled: June 13, 2017Publication date: December 13, 2018Inventors: Loic Francois Segapelli, Hengzhou Ding, Leung Chun Chan
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Patent number: 10154256Abstract: Aspects of the present disclosure relate to systems and methods for calibrating a flash for image capture. An example method may include receiving, from a camera, a first image of a scene captured with a first flash light source emitting light with a first color temperature and with a second flash light source emitting light with a second color temperature different from the first color temperature. The first flash light source and the second flash light source may be derived based on a first flash calibration setting of a number of stored flash calibration settings. The example method may also include determining a difference between a desired color characteristic for the first flash calibration setting and a color characteristic of the first image. The example method may further include adjusting the first flash calibration setting based on the determined difference.Type: GrantFiled: June 13, 2017Date of Patent: December 11, 2018Assignee: QUALCOMM IncorporatedInventors: Loic Francois Segapelli, Hengzhou Ding, Leung Chun Chan
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Publication number: 20180315166Abstract: A method and apparatus for determining an auto white balance (AWB) gain based on determined depth information. The method may include receiving an image captured by an image sensor, determining depth information associated with the captured image, assigning weights to a plurality of illuminants based on the determined depth information, determining an auto white balance gain based on the assigned weights and statistics of the captured image, and applying the auto white balance gain to the captured image.Type: ApplicationFiled: April 28, 2017Publication date: November 1, 2018Inventors: Ying Xie Noyes, Kyuseo Han, Ho Sang Lee, Hengzhou Ding, Leung Chun Chan, Loic Francois Segapelli
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Patent number: 9992423Abstract: Devices and methods for capturing images are described herein. A processor may be configured to capture a first image. The processor may further be configured to determine a distance between a lens and an image sensor of the image capture device for capturing the first image. The processor may further be configured to determine a portion of the image sensor to use for the first image based on the determined distance in order to maintain a constant field of view for one or more images captured by the image capture device. The processor may further be configured to adjust the portion of the image sensor used for the first image based on the determined portion of the image sensor to generate an adjusted first image.Type: GrantFiled: October 14, 2015Date of Patent: June 5, 2018Assignee: QUALCOMM IncorporatedInventors: Sanket Krishnamurthy Sagar, Venkata Ravi Kiran Dayana, Leung Chun Chan
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Patent number: 9910247Abstract: Methods and apparatuses for focus hunting prevention for phase detection auto focus (AF) are disclosed. In one aspect, the method is operable by an imaging device, for preventing focus hunting during a phase detection AF process. The method may include capturing an image of a scene and generating a phase difference value and a confidence level for the phase difference value based on the image. The method may also include calculating a focus hunting metric based at least in part on the phase difference value and the confidence level. The method may further include preventing focus hunting via at least one of preventing the start of the focus search and terminating the focus search, in response to the focus hunting metric meeting or exceeding a defined threshold value.Type: GrantFiled: January 21, 2016Date of Patent: March 6, 2018Assignee: QUALCOMM IncorporatedInventors: Jisoo Lee, Leung Chun Chan
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Publication number: 20170212327Abstract: Methods and apparatuses for focus hunting prevention for phase detection auto focus (AF) are disclosed. In one aspect, the method is operable by an imaging device, for preventing focus hunting during a phase detection AF process. The method may include capturing an image of a scene and generating a phase difference value and a confidence level for the phase difference value based on the image. The method may also include calculating a focus hunting metric based at least in part on the phase difference value and the confidence level. The method may further include preventing focus hunting via at least one of preventing the start of the focus search and terminating the focus search, in response to the focus hunting metric meeting or exceeding a defined threshold value.Type: ApplicationFiled: January 21, 2016Publication date: July 27, 2017Inventors: Jisoo Lee, Leung Chun Chan
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Patent number: 9716822Abstract: Methods and imaging devices are disclosed for determining a first direction to move a lens in an autofocus operation. For example, one method includes capturing a plurality of frames depicting a scene, selecting a portion of at least one frame that corresponds to an object in a displayed frame, and tracking the object in the plurality of frames, where tracking the object provides a reference parameter of the object for each of the plurality of frames. The method may further includes detecting a change in the reference parameter of at least a first frame and a second frame of the plurality of frames, determining a focus direction based on the change in the reference parameter, and initiating a focus operation by moving a lens of the imaging device based on the determined focus direction.Type: GrantFiled: April 22, 2015Date of Patent: July 25, 2017Assignee: QUALCOMM IncorporatedInventors: Lei Ma, Fan Deng, Leung Chun Chan
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Patent number: 9686463Abstract: Systems and methods for continuous automatic focus are disclosed. In some aspects, an object to focus on is selected from a field of view of a camera. At least one region of the field of view that includes the object is monitored for change. Regions of the field of view that do not include the object may not be monitored, thus improving efficiency and speed. If a change in the image content of the monitored region(s) occurs, the method may trigger a focus event. If the object moves to different region(s) of the field of view, the method detects the movement and adjusts the regions of the image being monitored to maintain focus on the object. In some aspects, the size of the object is also monitored. If the size of the object changes, a focus event may be triggered, depending on whether the amount of change exceeds predetermined parameters.Type: GrantFiled: March 10, 2015Date of Patent: June 20, 2017Assignee: QUALCOMM IncorporatedInventors: Fan Deng, Lei Ma, Leung Chun Chan
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Publication number: 20170111588Abstract: Devices and methods for capturing images are described herein. A processor may be configured to capture a first image. The processor may further be configured to determine a distance between a lens and an image sensor of the image capture device for capturing the first image. The processor may further be configured to determine a portion of the image sensor to use for the first image based on the determined distance in order to maintain a constant field of view for one or more images captured by the image capture device. The processor may further be configured to adjust the portion of the image sensor used for the first image based on the determined portion of the image sensor to generate an adjusted first image.Type: ApplicationFiled: October 14, 2015Publication date: April 20, 2017Inventors: Sanket KRISHNAMURTHY SAGAR, Venkata Ravi Kiran DAYANA, Leung Chun CHAN
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Publication number: 20170034432Abstract: An apparatus includes an initializer configured to adjust one or more settings of a camera prior to initialization of the camera. The one or more settings are adjusted based on an indication of motion detected using at least one measurement performed by a sensor device. The apparatus further includes a processing device configured to execute a camera application to initialize the camera after adjustment of the one or more settings.Type: ApplicationFiled: July 31, 2015Publication date: February 2, 2017Inventors: Ying Chen Lou, Ruben Velarde, Sanket Krishnamurthy Sagar, Hengzhou Ding, Liang Liang, Leung Chun Chan
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Patent number: 9462188Abstract: A method includes determining, at an image processor, a first time period associated with processing a first frame of an image captured via an image sensor. The method also includes extending a frame time for processing the first frame by a second time period. The second time period is based at least in part on an amount of permitted focus value contamination for processing the first frame, and the frame time includes the first time period and the second time period.Type: GrantFiled: March 20, 2015Date of Patent: October 4, 2016Assignee: QUALCOMM IncorporatedInventors: Leung Chun Chan, Ying Chen Lou
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Publication number: 20160269615Abstract: Systems and methods for continuous automatic focus are disclosed. In some aspects, an object to focus on is selected from a field of view of a camera. At least one region of the field of view that includes the object is monitored for change. Regions of the field of view that do not include the object may not be monitored, thus improving efficiency and speed. If a change in the image content of the monitored region(s) occurs, the method may trigger a focus event. If the object moves to different region(s) of the field of view, the method detects the movement and adjusts the regions of the image being monitored to maintain focus on the object. In some aspects, the size of the object is also monitored. If the size of the object changes, a focus event may be triggered, depending on whether the amount of change exceeds predetermined parameters.Type: ApplicationFiled: March 10, 2015Publication date: September 15, 2016Inventors: Fan Deng, Lei Ma, Leung Chun Chan
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Publication number: 20160142616Abstract: Methods and imaging devices are disclosed for determining a first direction to move a lens in an autofocus operation. For example, one method includes capturing a plurality of frames depicting a scene, selecting a portion of at least one frame that corresponds to an object in a displayed frame, and tracking the object in the plurality of frames, where tracking the object provides a reference parameter of the object for each of the plurality of frames. The method may further includes detecting a change in the reference parameter of at least a first frame and a second frame of the plurality of frames, determining a focus direction based on the change in the reference parameter, and initiating a focus operation by moving a lens of the imaging device based on the determined focus direction.Type: ApplicationFiled: April 22, 2015Publication date: May 19, 2016Inventors: Lei Ma, Fan Deng, Leung Chun Chan
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Publication number: 20160127628Abstract: A method includes determining, at an image processor, a first time period associated with processing a first frame of an image captured via an image sensor. The method also includes extending a frame time for processing the first frame by a second time period. The second time period is based at least in part on an amount of permitted focus value contamination for processing the first frame, and the frame time includes the first time period and the second time period.Type: ApplicationFiled: March 20, 2015Publication date: May 5, 2016Inventors: Leung Chun Chan, Ying Chen Lou