An Adaptive Scanning Method Oriented to HEVC Entropy Coding
A scanning method and self-adaptive technology, applied in the field of video coding, can solve problems such as limiting coding performance and ignoring characteristics, achieving low coding complexity and improving coding efficiency
Active Publication Date: 2019-11-22
XIAN UNIV OF TECH
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However, due to the relatively fixed scanning model, the characteristics of subsequent entropy encoding are ignored, which limits the further improvement of encoding performance.
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[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] The present invention provides a flow of an adaptive scanning method for HEVC entropy coding as follows: figure 1 As shown, the specific steps are as follows:
[0036] Step 1, according to the existing adaptive scanning method of HEVC, obtain the two-dimensional coordinates of the last non-zero coefficient position in the TU;
[0037] Step 2, according to the two-digit coordinates in step 1, determine the syntax elements last_sig_coeff_x_prefix, last_sig_coeff_y_prefix, last_sig_coeff_x_suffix, last_sig_coeff_y_suffix values related to the position of the last non-zero coefficient, and then perform entropy coding;
[0038] Step 3, obtain the syntax element CSBF related to the position of each non-zero coefficient in the TU;
[0039] Step 4, obtain the context probability index and LPS corresponding to each CSBF;
[0040] Step 5, p...
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The invention discloses a self-adaptive scanning method oriented to HEVC entropy coding. The self-adaptive scanning method comprises the specific steps of: firstly, performing self-adaptive scanning and entropy coding on syntactic elements associated with a last nonzero coefficient position in a TU; determining a syntactic element CSBF of each sub-block in the TU and a syntactic element sig_coeff_flag at each coefficient position in each sub-block; calculating a prediction probability that a CSBF value equals a least probability symbol (LPS), calculating a prediction probability that a sig_coeff_flag value equals the least probability symbol (LPS), and performing sorting, scanning and coding separately; and finally performing self-adaptive scanning and entropy coding on syntactic elementsassociated with all nonzero coefficient amplitudes in the TU. The self-adaptive scanning method allows the correlation among symbols to be fully utilized by HEVC, further improves the coding efficiency, does not need to transmit extra data rate information for a decoding end, and has low coding complexity which is only 0.33% of that of an existing algorithm.
Description
technical field [0001] The invention belongs to the technical field of video coding, and relates to an adaptive scanning method oriented to HEVC entropy coding. Background technique [0002] Video can bring more vivid subjective feelings to users, and it has gradually penetrated into every corner of our lives. With the emergence of high-definition / ultra-high-definition video such as "high resolution, high frame rate, and high pixel bit depth", more and more users participate in related video services and experience the experience of high-definition / ultra-high-definition video immersively. unique charm. However, the huge amount of video data not only increases the burden on video storage systems and global communication networks, but also affects the deployment and practical application of new services. Therefore, the new-generation video coding standard HEVC (High Efficiency Video Coding, High Efficiency Video Coding) is based on predictive coding, transform coding, and en...
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IPC IPC(8): H04N19/13H04N19/70H04N19/129H04N19/154
Inventor 李维张二虎赵凡范彩霞
Owner XIAN UNIV OF TECH