Zero-quantised discrete cosine transform prediction technique for video encoding

Zero‐quantised discrete cosine transform coefficients prediction technique for intra‐frame video encoding

“…Therefore it is desirable to predict them and not to compute them at all. Note that here we consider only the DCT and the quantisation because, recently it is found that the total execution time of the DCT and quantisation accounts for approximatively 40% of the total coding time [7].…”

“…Several methods [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have been proposed in the literature for predicting zero-quantised DCT (ZQDCT) coefficients followed by quantisation to reduce the computational complexity (CC) of inter-frame video coding [1][2][3][4][5][6][7], intra-frame video coding [8][9][10] and image compression [11]. Most of these methods use statistical approach and compare the sum of absolute difference (SAD) of residual pixels with different thresholds to predict an all-zero block or a partial-zero block.…”