Novel early detection of method of all-zero DCT coefficients in H.264
Cangju Xing · Jisuanji gongcheng yu sheji · 2011
An innovative algorithm for detecting all-zero discrete cosine transform(DCT) coefficient blocks prior to DCT and quantization for video coding standard of H.264/AVC is presented.A mathematic model for predetermination is established based on the characteristics of float/integer DCT formula and quantization,the distribution of the residual pixel values,analysis of the false-judgment and miss-judg-ment of prevent algorithms.The simulation results show that compared to conventional methods,the proposed algorithm achieves ave-ragely an 12%~37% encoding time saving and an 6%~10% improvement of compression rate with a little PSNR loss for low or middle bit-rate video sequences.