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Weighted prediction video encoding

A coding source, psycho-visual technology, applied in the direction of digital video signal modification, television, image data processing, etc.

Inactive Publication Date: 2008-07-23
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gradients are not encoded well in unweighted MPEG compression systems

Method used

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  • Weighted prediction video encoding
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  • Weighted prediction video encoding

Examples

Experimental program
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Embodiment Construction

[0051] In a ramp, a sequence of images gradually increases or decreases in brightness and chrominance magnitudes, usually from 0 for black to 0, for example. Fig. 2 is a simplified example where logWD = 0 and luminance values ​​are taken only from a P-picture example, eg the previous picture in the sequence. In Fig. 2, line 21 represents the maximum range achievable by the luminance signal in the 8-bit binary system. Line 22 represents the actual range of luminance within the reference MB of the reference image, specifically, it is between the integers a and b (a, b ε [0, 255]). Line 23 represents the actual range of MB pixel values ​​within the current image, which is between c and d. Assume that all luminance values ​​in the reference image are in the range [a, b], and all luminance values ​​in the current image are in the range [c, d], and it is also assumed that the current image (Cur- pic)23 with a linear gradient towards black in brightness. In other words, a and c te...

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Abstract

The present invention provides a method for encoding a source image using at least two reference images, by dividing the source image into regions based on a predetermined rule, and dividing the reference image into corresponding regions using the predetermined rule. The brightness values ​​for at least one region of the at least one reference image are weighted and offset by using the average brightness difference between the reference image region and the corresponding region of the source image to obtain brightness values ​​for at least the source image. A luminance value of a source image is predicted by averaging or summing weighted and shifted luminance values ​​from at least two reference images.

Description

technical field [0001] The present invention relates to weighted predictive video coding. Background technique [0002] Known advanced image coding systems using sophisticated video compression techniques have been standardized and commercially available for many years. Most of the more popular ones are the MPEG standard series and its successors. The main feature of these encoding processes is motion compensation, which is used to exploit temporal redundancy in moving image sequences. [0003] In these encoding processes, an image frame or image is divided into an array of irreducible pixels called image elements or pixels. Referring to FIG. 1 , by referring to pixels in one or more other images 12, the pixels of the current image 11 are encoded. The image 12 can be sequentially located in front of or behind the current image or multiple images, wherein one or more of the multiple images One is before or after the current image; therefore, prediction and interpolation ca...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/46H04N7/50
CPCH04N19/105H04N19/17H04N19/46H04N19/573H04N19/61H04N19/70H04N19/85G06T5/50
Inventor P·吴
Owner TELEFON AB LM ERICSSON (PUBL)
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