Complexity controllable DCT for real-time H.264 encoder
Journal of Visual Communication and Image Representation
Adaptive method for early detecting zero quantized DCT coefficients in H.264/AVC video encoding
IEEE Transactions on Circuits and Systems for Video Technology
Zero-block mode decision algorithm for H.264/AVC
IEEE Transactions on Image Processing
Computation reduction in motion search using early zero-block detection
SIP '07 Proceedings of the Ninth IASTED International Conference on Signal and Image Processing
Early determination of zero-quantized 8 × 8 DCT coefficients
IEEE Transactions on Circuits and Systems for Video Technology
Classified region algorithm for fast intermode decision in H.264/AVC encoder
EURASIP Journal on Advances in Signal Processing
Reducing computational costs of H.264/AVC for video codec in mobile devices
Proceedings of the 7th International Conference on Ubiquitous Information Management and Communication
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An improved algorithm for the early detection of all-zero blocks in H.264 video encoding is proposed in this paper. Based on the theoretical analyzes for the integer transform and quantization in H.264, we derive a sufficient condition under which each quantized coefficient becomes zero. And then, a more precise sufficient condition is proposed by modifying the calculation order of the sum of absolute difference obtained in the motion estimation. The simulation results show that the proposed algorithm achieves approximately an 11%-36% computational saving without video-quality degradation, compared to the conventional method.