Apparatus and method for white balance compensation of pixel data

摘要

An image processing apparatus and an image processing method are provided. The image processing apparatus includes a sample unit, an amplifier, an analog to digital converter, and a white balance unit. The sample unit is for sampling a pixel to obtain a pixel voltage. The amplifier is for amplifying the pixel voltage according to an analog gain. The analog to digital converter is for converting the amplified pixel voltage into digital pixel data, the digital pixel data including a number of first sub-pixel data which are corresponding to different colors. The white balance unit is for obtaining a number of second of sub-pixel data from white balance compensating the first sub-pixel data. The first sub-pixel data are white balance compensated respectively according to the analog gain and a number of white balance gains which are corresponding to different sub-pixels.

主权项

1. An image processing apparatus, comprising:
a sample unit for sampling a pixel to obtain a pixel voltage; an amplifier for amplifying the pixel voltage according to an analog gain; an analog to digital converter for converting the amplified pixel voltage into digital pixel data, the digital pixel data including a plurality of first sub-pixel data which are corresponding to different colors; and a white balance unit for obtaining a plurality of second sub-pixel data from white balance compensating the first sub-pixel data, the first sub-pixel data being white balance compensated respectively according to the analog gain and a plurality of white balance gains which correspond to different sub-pixels; wherein the white balance unit provides a plurality of third sub-pixel data according to the first sub-pixel data and the white balance gains, and determines, according to the analog gain and a full well level of the pixel, whether to clamp the third sub-pixel data so as to provide the second sub-pixel data.