Interpolation of video compression frames
AssigneeDolby Laboratories Licensing Corporation
InventorGary A. Demos
Life of this patent
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Abstract
Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.
Claims1
A method for video image decompression tangibly embodied on a video image decompression system, the method comprising:
- providing a sequence of predicted and bi-directionally predicted frames each comprising pixel values arranged in picture areas, wherein at least one of the picture areas in at least one of the bi-directionally predicted frames is predicted from picture areas in one or more reference frames using direct mode prediction;
- determining a predicted motion vector with a frame-distance method, wherein the frame-distance method comprises:
- given a predicted picture area in a first reference frame, a bi-directionally predicted frame of the predicted picture area, and at least one motion vector between the predicted picture area in the first reference frame and a co-locating picture area in a second reference frame, determining a predicted motion vector that is linearly proportional to the at least one motion vector and a distance between the bi-directionally predicted frame of the predicted picture area and at least one of the first or second reference frames;
- determining the predicted motion vector as a function of multiplying the at least one motion vector with a frame scale fraction;
- and
- utilizing a processor at least to determine the predicted motion vector with the frame-distance method and the multiplication,
- wherein both the first and second reference frames are in a display order that is prior to a display order of the bi-directionally predicted frame of the predicted picture area.
Dependencies are inferred from the claim text.