AVS3 intra frame prediction parallel algorithm based on minimum CU cost
To address the time-consuming issue of audio video coding standard 3(AVS3) intra frame prediction, an intra frame prediction parallel algorithm based on the cost of the minimum coding unit (CU) was proposed. Firstly, the images were divided into the smallest CUs. Secondly, the original pixels were u...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Beijing Xintong Media Co., Ltd
2025-02-01
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| Series: | Dianxin kexue |
| Subjects: | |
| Online Access: | http://www.telecomsci.com/zh/article/doi/10.11959/j.issn.1000-0801.2025027/ |
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| Summary: | To address the time-consuming issue of audio video coding standard 3(AVS3) intra frame prediction, an intra frame prediction parallel algorithm based on the cost of the minimum coding unit (CU) was proposed. Firstly, the images were divided into the smallest CUs. Secondly, the original pixels were used as references to calculate the intra-mode cost of all smallest CUs in parallel. Finally, the intra-mode priorities of other CUs were quickly calculated by means of cost combination, and the optimal 15 modes were selected to enter the rough mode decision (RMD) stage. Additionally, three optimization strategies were proposed to reduce the errors caused by the proposed method.The original pixels were preprocessed before prediction to better approximate reconstructed pixels; the cost function of intra-frame prediction was modified to more accurately estimate the priority of each mode; and for larger CUs, the cost of the top-level CU was used as a reference to reduce cumulative errors during CU combination. Experimental results demonstrate that while the code rate is reduced by only 0.35%, the overall encoding time is reduced by 27%, effectively reducing the time required for intra frame prediction and ensuring the encoding quality. |
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| ISSN: | 1000-0801 |