A METHOD FOR DETERMINING THE CONDITION IN ZERO BLOCK PREJUDGMENT AND FOR PREJUDGING ZERO BLOCK

摘要

This invention discloses a method for determining the condition in zero block prejudgment which comprises the steps of: obtaining the predictive difference image block between 4*4 block of current video image and the reference 4*4 block of preceding frame; calculating the sum of absolute difference corresponding to said predictive difference image block; according to the sum of absolute difference, calculating the quantization value of the DC coefficient which is integer transformed from the predictive difference image block by using integer transforming expression; obtaining the sufficient condition that the quantization value of said DC coefficient is equal to zero as the condition in zero block prejudgment. Accordingly, this invention also discloses a method for prejudging zero block. This invention can be applied to the processing of zero block prejudgment in H.264 compression encoding standard and can improve the compression encoding efficiency in H.264 standard.