自适应分区DCT/DWT低码率视频编码算法

为了降低低码率视频编码算法的块效应与环效应，提出了一种基于自适应分区余弦变换／子波变换和重叠运动补偿的视频编码算法，首先给了一种空－是相关自适应运动估计算法，有效降低运算复杂性，然后通过过层游动窗块区域形成算法检测现帧间预测误差场的高能量区域，对大区域进行了子波变换和量化，对零散区域进行余弦变换和量化，根据人类视觉系统（ＨＶＳ）的空－频和时－频特性，给出基于ＨＶＳ的量化模型，以期在信噪比约束下获得

自适应分区DCT/DWT低码率视频编码算法

A novel video coding algorithm based on adaptive blocking regional wavelet transform and dis-crete cosine transform is described in this paper. An adaptive algorithm of motion estimation employs the spatial-temproal correlation presented in motion vector field to reduce calculating complexity. The high energy regions ofinterframe predicted difference are first detected using hierarchical sliding-window region forming algorithm.Thedetected regions are segmented to DWT regions and DCY regions. This scheme reduce the ringing-effects andblocking-effects compared with traditional DWT or DCf coding algorithms . A quantization model based on HVSspatiality-frequency and time-frequency feature is used in coding algorithm.Simulation result shows acceptableimage quality for CIF resolution at low bit-rate and very low bit-rate. This video coding algorithm is downwardcompatible with H.263,and is suited for low bit-rate video conference application.