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We describe an efficient algorithm for jointly optimizing the quantization parameter (QP) and the quantization decisions in H.264/AVC. Based on bitrate estimation for quantized and entropy coded coefficients in H.264/AVC, a technique was introduced to select only a small subset of transform coefficients which have the most significant impact on the overall quantization performance. Only the quantization...
In this paper, a fast RDO quantization algorithm for H.264/AVC is proposed. In this algorithm, we consider that each quantized coefficient of level / may take one of the three possible levels / or I-I or / + 1 for output, thus 316 combinations need to be tested for a 4x4 block. To reduce the searching space of level adjustments, the input quantized coefficients are filtered in a hierarchical way....
In the perceptual video coding scheme, the properties of the human visual system (HVS) are usually used to improve the subjective quality. The frequency sensitivity is one of the most important properties of HVS and related techniques have been adopted in many video coding standards, such as MPEG2 and H.264/AVC High Profile. However, the frequency weighting algorithms used in those standards are all...
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