摘要
为提高编码效率,通过分析残差系数在空域和DCT域均符合拉普拉斯分布后,提出一种快速DCT算法。该算法能够在DCT之前对每个量化DCT系数进行零值预判而节省DCT计算。通过头肩序列的实验表明新算法在不降低图像质量的条件下,其整体运算复杂度优于常规算法。
To improve encoding efficiency, by analyzing the distribution of residual coefficients in spatial-domain and DCT-do- main, the coefficients accord with a Laplacian distribution with zero mean. Then, a fast DCT algorithm is proposed, which judges whether each of DCT coefficients is quantized to zero before DCT, and computation for DCT is saved. The head-shoulder sequence experiments show that the overall computing complexity of new algorithm is superior to the normal under the premise of not leading to the reduction of image quality.
出处
《电视技术》
北大核心
2008年第11期16-19,共4页
Video Engineering
关键词
拉普拉斯分布
全零块检测
离散余弦变换
运动估计
Laplaeian distribution
all-zero block detection
discrete cosine transform
motion estimation
