Study on real-time image enhancement pre-processing for CMOS sensor
Wang Jian, Chen Qimei,Zhang De (Department of Electronics & Engineering, Nanjing University, Nanjing 210093,China)
In order to compensate for the inherent limitation of CMOS image sensor, an algorithm of real-time image enhancement pre-processing and its implementation are presented. The framework of the pre-processing algorithm is introduced firstly. Considering the real time, transplantation characteristics and the hardware performance required by the method, the major function blocks of the pre-processing algorithm are discussed in detail, including gamma correction, color interpolation, color correction, color space conversion, image enhancement, digital gain control, auto contrast adjustment, and auto exposure. Experiment results prove that the proposed method effectively improves the image quality captured by CMOS image sensor.