The Digital Video Image Transmission System, Several Problems

This paper mainly investigates two important problems of digital image and video transmission. One is compression; the other is digital modulation. Here we discuss the basic theory and their realization, and mainly concentrate on their realization. First of all, the paper discusses the basic theory and means of image and video compression, then attaches more importance to the standards of image and video compression, such as MPEG. As for its realization, there are two ways: soft and hard. Here we try out a hard way with video card to realize it. In the second place, we discuss some ways of digital modulation in transmission of image data, for example BPSK, QPSK, QAM, and so on. Here the paper compares the differences of these ways of modulation, and gives some simulation results, and chooses two integrated circuits: HSP50215 and HSP50214B, then designs the structure of QPSK's realization. Finally as a special example of the system of image transmission, the paper discusses the structure of digital video broadcasting system, and manages to complete its simulation in MATLAB, and gives the simulation results, so that we can have an overall recognition.