纹理感知多模式编码的帧存有损压缩算法研究

A Research on Frame Memory Lossy Compression Algorithm Using Texture Perception Multimode Coding

  • 摘要: 为了提高帧存储的压缩性能,该文提出了一种纹理感知多模式编码的帧存有损压缩算法。该算法首先感知区域纹理的方向性,为当前像素计算得到最优方向的参考像素,并方向性预测得到预测残差;然后根据运动方向的延续性和帧间同位置像素的量化步长的相关性,对率失真模型进行改进,以得到量化参数;最后针对不同纹理区域的预测残差特点,在游程编码、自适应k的哥伦布编码和直传编码3种编码模式中,自适应选取最优的编码模式进行编码。实验结果显示,与内容感知自适应量化的帧存压缩算法相比,一方面,该算法在PSNR和编码时间几乎不变的情况下,平均压缩率提高了14.8%;另一方面,该算法的性能与图像复杂程度强相关,即图像纹理越简单,该算法的编码时间越短,提高的压缩率越大。

     

    Abstract: A texture perception multimode coding for frame memory lossy compression is proposed to improve frame memory compression performance. First, the optimal directional reference pixel is calculated by using the texture perception and prediction residual is obtained by using the directional prediction. Then, rate-distortion is improved to obtain quantized parameter based on the continuity of motion direction and the correlation between quantization steps of same-position pixels between frames. Finally, according to the prediction residual characteristics of different texture regions, among the three encoding modes of run length coding, adaptive k Columbus coding and direct coding, adaptive selection of the optimal encoding mode is carried out. The simulation results show that, compared with the frame memory compression algorithm based on content-aware adaptive quantization, the average compression rate of this algorithm is improved by 14.8% when PSNR and encoding time are almost unchanged. The performance of the algorithm in this paper is strongly related to the complexity of the image, that is, the simpler the image texture is, the shorter the encoding time of the algorithm is, and the higher the compression rate is.

     

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