Early detection method of all-zero integer transform coefficients
IEEE Transactions on Consumer Electronics
A mathematical analysis of the DCT coefficient distributions for images
IEEE Transactions on Image Processing
An improved early detection algorithm for all-zero blocks in H.264 video encoding
IEEE Transactions on Circuits and Systems for Video Technology
A General Method for Detecting All-Zero Blocks Prior to DCT and Quantization
IEEE Transactions on Circuits and Systems for Video Technology
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In video delivery system, it is known that early detection of all-zero quantized discrete cosine transform (DCT) coefficients can be used to reduce the computational cost of H.264/AVC video encoding, which is critical for mobile applications. In this paper, a new method to efficiently and accurately detect such all-zero coefficients is presented. The early detection criterion is derived from a new rate - quantization model that analyzes the distribution model of DCT coefficients and takes into account the unique features of H.264/ AVC quantization process. Simulation results show that the proposed method consistently achieves a very high detection rate, while maintaining a low false detection ratio and negligible quality degradation. A comparison with other existing methods shows that by considering the unique features in the H.264/AVC quantization step, the detection of all-zero DCT coefficients is improved. The investigation on encoding process runtime also indicates a significant time saving by enabling the proposed early AZB detection especially for low bit-rate applications in mobile devices.