US 2017/0364772 A1Published application

Differential image processing

AssigneeQUALCOMM Incorporated

InventorsSiddharth Chauhan, Nishant Pandit, Hau Ling Hung

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Abstract

An image signal processor (ISP) processes received image frame data. In order to reduce power consumption caused by the processing of substantially similar image tiles of received image frames, differential processing may be used to determine which image tiles of a received image frame should be processed by the ISP, based upon a comparison between the received image tiles and previously received image tile data. In addition, differential processing may be automatically disabled in response to a determination that the image frames are too different from each other to realize any savings in processing resources or memory usage, and reenabled in response to a determination the received image frames are similar enough such that power savings can be realized through differential processing.

Claims20

Dependent claims

A method operable by an image processing device, the method comprising:

storing an indication of a first image frame in a buffer of the device, the first image frame corresponding to a previously received image frame;
receiving a second image frame, the second image frame comprising a plurality of image tiles;
performing differential image detection (DID) via determining which tiles of the second image frame are to be processed by an image signal processor (ISP) based on:
identifying an indication of a corresponding first image tile of the first image frame corresponding to a second image tile of the second image frame;
comparing the indication of the corresponding first image tile and the second image tile to determine a dissimilarity value between the corresponding first image tile and the second image tile;
in response to a determination that the dissimilarity value between the corresponding first image tile and the second image tile meets a tile threshold, designating the second image tile as a delta tile to be processed by the ISP;
in response to a determination that a number of designated delta tiles associated with the second image frame has reached a frame threshold limit, not performing DID for a remainder of the image tiles of the second image frame, such that the remainder of the image tiles are all designated to be processed by the ISP.

4 more elements

An image processing device, comprising:

a buffer storing an indication of a first image frame in a buffer of the device, the first image frame corresponding to a previously received image frame;
a processor configured to:
receive a second image frame, the second image frame comprising a plurality of image tiles;
perform differential image detection (DID) via determining which tiles of the second image frame are to be processed by an image signal processor (ISP), based on:
identifying an indication of a corresponding first image tile of the first image frame corresponding to a second image tile of the second image frame;
comparing the indication of the corresponding first image tile and the second image tile to determine a dissimilarity value between the corresponding first image tile and the second image tile;
in response to a determination that the dissimilarity value between the corresponding first image tile and the second image tile meets a tile threshold, designating the second image tile as a delta tile to be processed by the ISP;
in response to a determination that a number of designated delta tiles associated with the second image frame has reached a frame threshold limit, not performing DID for a remainder of the image tiles of the second image frame, such that the remainder of the image tiles are all designated to be processed by the ISP.

5 more elements

Dependencies are inferred from the claim text.