Research And Application In Video Image Processing And Technique Of Video Transmission On The Web

The research and exploitation in encoding, compression, encryption, watermark embedding and transmission of video data has reached a high level in video image processing field today. Streaming media has also been the rage in recent years. High quality real-time transmission of video image on the web has come true today.In this thesis, we put forward several video image processing mode based on Visual C++6.0 including encoding, catching, compression, conservation of video image and conversion between video format.In video image encrypting part, a secret key is produced by a secret key random maker, and the video files are encrypted which the encrypting and decrypting key is same. The user can not play the video files normally unless he acquire the decrypting key, so we can prevent the video files from being visited by non-authorized users.Some experiments are done in video real-time catching, compressing and saving part, for example, catching single non-compressed and compressed video frame, many video frames which limit playing time, adopting different compressing format which limit the number of video frame. From above, the space of non-compressed video files is ten or hundred times as the compressed files. In order to realize real-time transmission of video image on the web, we must adopt appropriate compressing and saving format, and give an appropriate compressing ratio for video image. In this thesis, we give transform between several familiar video formats, put forward the radical frame and some ideas about video image real-time transmission on the web little by little, use a tool for real-time playing supporting YUV video format to do some playing experiments:one' s format is CIF (352×288) , and the other' s format is QCIF (176×144) .In the last part of this thesis ,we give two video image transmission systems on the web based on Visual C++6. 0 via the video image collecting tool (using a small video camera in the experiment), one is the same with point to point in the LAN, the other is based on client-server mode in the Internet.