Procedure for quantification of coefficients

Details Procedure for quantification of coefficients Procedure for quantification of coefficients

H - Electricity

04

N

H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2152237

The disclosure concerns a procedure for quantification of coefficients in a variable data rate image compression system, in the form of blocks and macro-blocks, said system including means of transformation of blocks of pixels into blocks of coefficients, means of quantification of these coefficients, means of storage of coded information before transmission, and means of regulation of means of quantification as a function of the state of the means of storage. The procedure is such that each image being divided into groups of blocks, at least when a so-called current image must be coded in inter mode, a quantifier is determined at the start of the current image, said quantifier being corrected by a correction coefficient recalculated before the quantification of at least one of said groups, said coefficient being a function of the difference between, first, the number of bits produced for all the groups of blocks previously coded and, secondly, a prediction of this number of bits, said prediction being based on the distribution of the bits during the coding of at least one image preceding the current image. The invention is applicable notably in the field of image compression at low data transmission rates.

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