Patent ID: 6141449
Filing Date: 2000-10-31
Classification: G06T

Abstract:
A coding mode determination system for adaptively selecting an inter-frame predictive coding and an intra-frame coding in the compression coding of moving pictures using inter-frame prediction, comprising:a block dividing means for dividing a macro-block, a unit for coding mode switching, into a plurality of sub-blocks;first dispersion calculation means for calculating the inter-frame predictive difference dispersion for each of said sub-blocks divided by the block dividing means; first nonlinear function transform means for using a nonlinear function to transform the dispersion values obtained by said first dispersion calculation means to values for estimating amounts of generated encoded information;first adder means for adding the values for estimating amounts of generated encoded information for each of said sub-blocks obtained by said first nonlinear function transform means to produce an inter-frame sum;second dispersion calculation means for calculating the intra-frame dispersion for each of said sub-blocks divided by the block dividing means;second nonlinear function transform means for using a nonlinear function to transform the dispersion values obtained by said second dispersion calculation means to values for estimating amounts of generated encoded information;second adder means for adding the values for estimating amounts of generated encoded information for each of said sub-blocks obtained by said second nonlinear function transform means to produce an intra-frame sum; anda coding mode determination means for determining one of an inter-frame and intra-frame coding mode as a usable mode according to which is smaller of said inter-frame sum and said intra-frame sum.