During the procedure of real–time image processing, FPGA was often utilized to convert the format of collected digital image. This paper looks at how to process the conversion of 3 types format image, which comes from Micron MT9V112 CMOS DIGITAL IMAGE SENSOR. The study first introduces YCbCr4:2:2 to YCbCr4:4:4, RGB565 to RGB888, Bayer data to RGB888 and image denoising methods. It then gives the design module based on Verilog HDL and simulation via MATLAB. The simulation result demonstrates that this module can successfully process 640x480 pixels with desirable real-time results.