Video Monitor With VOD System--Design And Implement The Video Codec

At first, this thesis introduces the structure and the application of the Video Monitor with VOD System, then analyzes the main techniques used in the video codec in detail, including DCT, the frames inter predict and the rate control, etc. DCT is used to remove the spatial redundancy of the still image. The frames inter predict is used to remove the temporal redundancy of the video sequence and the rate control is used to match the encoder output with the channel rate, etc. The emphasis is put on the frames inter predict.After that, several ways including: the fast DCT algorithm, the zero DCT coefficients verdict before DCT, the fast motion estimate algorithm and the TMN8 rate control strategy are researched to improve the codec's efficiency in this thesis. The fast DCT algorithm is used to make DCT quickly. The zero DCT coefficients verdict before DCT is used to avoid some unnecessary DCT. The fast motion estimate algorithm is used to increase the frame predict speed and the TMN8 rate control strategy is used to make the rate control simple and useful in the video coder. The main effort is on the fast DCT algorithm and the TMN8 rate control strategy. Based on these ways, some tests are implemented to test its performance.At last, based on the H.263 standard, this thesis applies the above techniques and methods to design and implement the video encoder of the Video Monitor with VOD System. And the designs and implementations of the video capture" and the video decoder are given out, too.