The Research Of Video Image Processing System Based On FPGA Technology

With the advancement and improvement of digital techniques, the application field of video image acquisition and processing is constantly expanding. FPGA has the characteristics of high speed, low power, short development cycle, etc. And these characteristics are very suitable for the computing of amount of data processing. FPGA is most suitable for real-time image processing.This paper mainly introduces the design of video image processing system based on FPGA, it realizes image acquisition, storage, VGA reality and some commonly used digital image processing algorithm. Image acquisition module use CMOS image sensor OV7620, The OV7620's A/D converter and other auxiliary circuits are integrated on the chip, so the system design is simplified; it is also very easy to read its image data, the initial configuration can be done through the SCCB protocol. Image storage module uses two SRAM for table tennis operation to complete frames save of image data, realize the image acquisition of 25 frames per second 640 x 480 pixels, preparing for later image processing. Image display module with THS8133 chips for A/D conversion gets the analog signals used for display, and the FPGA produces horizontal sync and field synchronized signal used for VGA display, then image VGA display is completed. Real-time digital image processing section describes the rationality and applicability of the median filter algorithm and the convolution algorithm, simultaneously the fast median filtering algorithm and convolution algorithm have realized with the assembly line design method. The digital image acquisition and the digital image processing module in this design are realized on one FPGA. Thus, the system structure is simplified.The evaluation of the image acquisition system shows that its performance reaches the requirements of the system, and it can work reliably with low power consumption.