基于六边形采样的离散余弦变换及压缩编码的研究-Based on hexagonal sampling the discrete cosine transform and compression research

块匹配算法，包含全搜索算法，菱形搜索算法，十字菱形搜索算法，六边形搜索算法，十字六边形搜索算法-Block matching algorithms, including full search algorithm, diamond search algorithm, cross diamond search algorithm, hexagonal search algorithm, cross-hexagon search algorithm