1 December 2004 Efficient discrete cosine transform and quantization algorithm based on eliminating redundant computations in H.264 video encoding
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Optical Engineering, 43(12), (2004). doi:10.1117/1.1813442
Abstract
We propose a new efficient discrete cosine transform (DCT) and quantization algorithm for the H.264 encoder. We theoretically analyze integer DCT and quantization of the H.264 encoder. A theoretical analysis shows that there are redundant calculations for DCT and quantization. In the proposed algorithm, one of four methods—1. DCT skip; 2. reduced DCT1; 3. reduced DCT2; 4. original DCT—is selected by using the minimum SAD information obtained in the motion estimation. The reduced DCT1 and reduced DCT2 eliminate the redundant calculations required for DCT and quantization. The simulation results show that the proposed algorithm achieves an approximately 15 to 25% computational saving without video-quality degradation, compared to the conventional method.
Yong Ho Moon, Se Hyeok Park, Jae Ho Kim, "Efficient discrete cosine transform and quantization algorithm based on eliminating redundant computations in H.264 video encoding," Optical Engineering 43(12), (1 December 2004). https://doi.org/10.1117/1.1813442
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