公开(公告)号：US20230276060A1

公开(公告)日：2023-08-31

申请号：US18144484

申请日：2023-05-08

Applicant: OmniVision Technologies, Inc.

Inventor： Hitoshi Watanabe

IPC: H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/513 ,  H04N19/70 ,  H04N19/139 ,  H04N19/146

CPC classification number: H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/513 ,  H04N19/70 ,  H04N19/139 ,  H04N19/146

Abstract: A video encoding method includes adding, to a bitstream, an indicator of whether a frame resolution is to be reduced. The method also includes, when said indicator indicates that the frame resolution is to be reduced, encoding a block of video data on a current video frame without motion compensation. A video decoding method includes receiving, as a syntax element from a bitstream, an indicator of whether a frame resolution is to be reduced. The method also includes, when said indicator indicates that the frame resolution is to be reduced, decoding a block of video data on a video frame without motion compensation.

公开(公告)号：US11695944B2

公开(公告)日：2023-07-04

申请号：US17469724

申请日：2021-09-08

Applicant: OmniVision Technologies, Inc.

Inventor： Hitoshi Watanabe

IPC: H04N19/164 ,  H04N11/02 ,  H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/513 ,  H04N19/70 ,  H04N19/139 ,  H04N19/146

CPC classification number: H04N19/30 ,  H04N19/139 ,  H04N19/146 ,  H04N19/176 ,  H04N19/46 ,  H04N19/513 ,  H04N19/70

Abstract: A video encoding method includes (i) determining a current bit rate of a communication channel between a destination device and a source device that stores an input video frame, and (ii) generating a current reconstructed frame and an encoded bitstream at least in part via inter-frame coding of a current input video frame of a sequence of input video frames using a previously-generated reconstructed frame generated at least in part via inter-frame coding of a previous input video frame. The current reconstructed frame is a compressed version of the current input video frame. When both (i) a subsequent bit rate, determined after said inter-frame coding, is less than a threshold and (ii) the current bit rate exceeds the threshold, the method includes: (a) generating a downscaled reconstructed frame at least in part by downscaling the current reconstructed frame; and (b) appending the encoded bitstream with a bit sequence representing the downscaled reconstructed frame.

公开(公告)号：US20220301187A1

公开(公告)日：2022-09-22

申请号：US17700655

申请日：2022-03-22

Applicant: OmniVision Technologies, Inc.

Inventor： Hitoshi Watanabe

IPC: G06T7/246 ,  G06T7/00

Abstract: A motion-detection method includes for a motion-detection region in a first image of a scene, (i) determining a respective first pixel-value gradient at each of a plurality of pixel-coordinates within the motion-detection region, and (ii) determining a first feature-descriptor value as a function of the first pixel-value gradients and position vectors defined by the plurality of pixel-coordinates. The method also includes, for the motion-detection region in a second image of the scene, (i) determining a respective second pixel-value gradient at each of the plurality of pixel-coordinates, and (ii) determining a second feature-descriptor value as a function of the second pixel-value gradients and the position vectors. The method also includes determining a difference-parameter that varies in direct relationship to a difference between the first feature-descriptor value and the second feature-descriptor value.

公开(公告)号：US20230070021A1

公开(公告)日：2023-03-09

申请号：US17469724

申请日：2021-09-08

Applicant: OmniVision Technologies, Inc.

Inventor： Hitoshi Watanabe

IPC: H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/146 ,  H04N19/70 ,  H04N19/139 ,  H04N19/513

Abstract: A video encoding method includes (i) determining a current bit rate of a communication channel between a destination device and a source device that stores an input video frame, and (ii) generating a current reconstructed frame and an encoded bitstream at least in part via inter-frame coding of a current input video frame of a sequence of input video frames using a previously-generated reconstructed frame generated at least in part via inter-frame coding of a previous input video frame. The current reconstructed frame is a compressed version of the current input video frame. When both (i) a subsequent bit rate, determined after said inter-frame coding, is less than a threshold and (ii) the current bit rate exceeds the threshold, the method includes: (a) generating a downscaled reconstructed frame at least in part by downscaling the current reconstructed frame; and (b) appending the encoded bitstream with a bit sequence representing the downscaled reconstructed frame.