运动图象的压缩是实现多媒体通信的关键技术之一。本文提出一种基于离散余弦变换系数的条件帧间补偿法及其视频编码方案。该算法利用DCT变换特点和人眼视觉特性，快速高效地对运动图象进行编码。

A Novel Video Coding Scheme with conditional interframe replenishment(CFR) algorithm based on DCT frequency domain is proposed in this paper. Utilizing the characteristics of DCT and visual perception of human, this DCT-based CFR algorithm can encode and decode motion pictures quickly and efficiently. Its compression ratio and reconstructed picture quality are similar with DCT/MC coding scheme such as H.261 and MPEG but with much lower complexity. Both simulation and practical video communication application have shown that this algorithm has high performance and ease of implementation. Because of its low computing complexity, it can be real-time realized by PC software. It can also work with H.261/MPEG by replacing ME/MC module(the motion vector is fixed as zero) after some little modifications on coding scheme. This DCT-based CFR algorithm and the video coding scheme are very suitable for low cost full PC software videophone, video conference and multimedia communication system.