To realize the real time video coding in low bit rate communication by PC software is the hotspot in image compression field

thus a frequency domain block matching algorithm based on discrete cosine transform(DCT) coefficients is proposed in this paper. By utilizing threshold matrix

the motion estimation computation is greatly reduced and the time used in searching motion vectors is saved. The DCT based frequency domain block matching algorithm can encode and decode motion pictures quickly and efficiently. Its reconstructed picture quality is higher than the 3SS algorithm and is closer to the FS algorithm. Simulation results show that the proposed DCT based block matching algorithm and the video coding scheme has high performance and is easy for implementation. Because of its low computing complexity

it can be real time realized by PC software and has a good value in practice.