Image Acquisition And Processing System Based On DSP

Image acquisition and processing is an important branch of information processing technology. It has great utilities in the fields of industry measuring, medical device, military and commercial use. The traditional architecture of image acquisition is based on computer, but this architecture has disadvantages of large power consuming, big size and hard to debugging. Due to above problems, this dissertation proposed an image acquisition and processing system using DSP and CPLD. TMS320C6713 DSP, which is a 32-bit floating pointer processor and can work on 500MHz, was applied as the core processor to realize the algorithms. CPLD is to control video decoder to acquire image data. Because of its high speed and high accuracy, this system provided an ideal platform for image processing.At the beginning of dissertation, overall architecture and working principle of the system was introduced. Function of each module was also introduced briefly. Moreover, the dissertation also described performance of TMS320C6713 DSP and the system working flow.In addition, the hardware design of back circuit board was presented. This section consists of image sensor, image buffer and its control circuit. Video decoder, SAA7111A, worked as image sensor to convert analog video signal to digital video data and isolated the synchronous signal for image acquisition. Image data buffer was used to store image data temporarily in order to match acquisition timing between DSP and SAA7111A. Image acquisition timing match and logical control was completed by CPLD. At last, the simulation result of acquisition timing was also given.Besides, hardware design of image processing platform was introduced in the dissertation. This section can be divided into DSP minimal system, image storage module and image transmission module. EDMA controller of DSP transported image data from FIFO to SDRAM via DMA mode. DSP sent image data to host computer via serial port and a whole image will be displayed on host computer. An external flash chip is used to store DSP program. Bootloader design of the system was introduced.At last, image processing algorithms were also realized on the DSP platform, including image binary, image edge detection with SOBEL operator, image sharpening with LPLACE operator and image smoothing. Algorithm principle and results were given in the dissertation.