Image Preprocessing of CMOS Image Acquisition System Based on FPGA

Abstract

The paper introduces a high-frame-rate and high-resolution image acquisition system with DVI Interface, which uses the CMOS image sensor of 2.3 million pixels as the light-sensitive chip and a high-performance FPGA as the main processor. In order to get better image quality and correct the unrealistic color, the image preprocessing is implemented based on FPGA, including color space conversion and auto white balance. Firstly, RGB color space is conversed to YCbCr color space. Then a novel auto white balance algorithm is proposed to correct the unrealistic color iteratively. The experiment results show that the color space conversion greatly simplifies the design process with four DSP48E units. And the novel auto white balance algorithm improves the precision of channel gains.