Patent ID: 6654419
Filing Date: 2003-11-25
Classification: H04N

Abstract:
A method for coding of a video image, the method comprising:providing a data block representing pixel values for at least part of a digital image for each of at least a present frame and an adjacent frame; determining if the pixel values of the present frame data block are the same as the pixel values of the same data block for the adjacent frame; when the pixel values for the present frame data block are the same as the pixel values for the same data block for the adjacent frame, providing a predictor coefficient indicating that the present frame data block pixel values are predictable from the adjacent frame data block pixel values; when at least one of the pixel values for the present frame data block is not the same as a corresponding pixel value for the same data block for the adjacent frame, determining if all pixels for the present frame data block have the same value, and: when all pixels for the present frame data block have the same value, providing a dc predictor coefficient representing a constant pixel value for all pixels in the data block; and when at least two pixels for the present frame data block have different values, providing a selected set of non-dc predictor coefficients; using the predictor coefficients to determine a predicted pixel value for each pixel in the present frame data block; forming and issuing a difference value between pixel value and predicted pixel value for each pixel in the present frame data block; receiving the pixel values, the predicted pixel values and the difference values, and forming and issuing a block of compressed values representing the pixel values for the present frame data block; and choosing said set of non-dc predictor coefficients for said selected frame to have an algebraic sum of 1.