Gr-Gb channel difference improvement of CMOS Image Sensor with transfer gate barrier optimization

Abstract

The color difference defect can be eliminated through the lens shading correction (LSC) function in the image signal processing (ISP) circuit. However, the design trend of the image sensor mounted on the smartphone is changing to the concept of correcting the image using the application processor (AP) circuit of the phone. The purpose of the study is to construct an appropriate model describing lens shading & Gr-Gb imbalance mechanisms affecting image quality and apply the model for image correction.