Luminance-Based Adaptive Green Enhancement Algorithm Design And Circuit Implementation

With the continuous development of the digital camera and cellphone camera technology, CIS (CMOS image sensor) has been widely used. People have high pursuit about CIS function, and the demand for color enhancement is also growing. When shooting landscapes, people want to shoot more vivid green world. In this paper, the existing green enhancement algorithms are surveyed and studied then I point out that there are two main issues,i.e.,the presence of over-saturation and color deviation, which can not satisfy people’s demands for stronger green enhancement. In this paper, YCbCr space is carefully studied, and then I find the correct mathematical model about Y (brightness) on Cb (blue chrominance components), Cr (red chrominance component) constraint relations. Considering their constraints, I propose appropriate multiplier factor list, and use the matlab as simulation tool. The simulation images show that the proposed method effectively enhances the green color and at the same time avoid the problems of over-saturation and color deviation.The proposed algorithm is also verified by RTL circuit model. Firstly, based on matlab algorithm I write the RTL code. Secondly, with the establishment of the matlab and modelsim joint verification platform, the functional consistency of RTL code and matlab algorithm is verified. Thirdly, logic synthesis is completed through Design Compiler. Finally, the functionality and timing accuracy of gate-level circuit is verified by using NCsim.