Patent ID: 11876987
Assignee: DOLBY LABORATORIES LICENSING CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for encoding a video stream captured by an image sensor that includes a plurality of pixels, each pixel belonging to one of N subframes, where the pixels of each subframe are distributed substantially uniformly over an area of the image sensor, each subframe characterized by (i) a same exposure-time sequence that includes a short exposure-time alternating with a long exposure-time, and (ii) a respective temporal offset equal to an integer multiple of the short exposure-time, the method comprising:
for each of the N subframes, linearly combining a long-exposure low-resolution image, captured at the long exposure-time, and a short-exposure low-resolution image, captured at the short exposure-time, to yield a subframe residual image;
combining at least some of the long-exposure low-resolution images from the N subframes to yield a full-frame long-exposure image having a higher resolution than any long-exposure low-resolution image, wherein said at least some of the long-exposure low-resolution images comprise all pixels of the image sensor;
encoding the full-frame long-exposure image into a base layer of the video stream; and
encoding at least some of the subframe residual images from the N subframes into an enhancement layer of the video stream.