Auto white balance adjustment system, auto white balance adjustment method, and camera module

摘要

According to one embodiment, a white balance fine adjustment starting instruction unit determines whether to start fine adjustment in white balance using a first threshold value. The white balance fine adjustment starting instruction unit determines whether to keep on performing the fine adjustment using a second threshold value. The second threshold value is set for the fine adjustment based on a second color judgment gate. The second color judgment gate defines the range of a target color temperature in white balance adjustment for each light source.

主权项

1. An auto white balance adjustment system in a processor, the system configured to comprise:
a white balance adjustment unit which performs white balance adjustment on an image signal based on a white balance gain; a color judgment unit which performs color judgment targeting the image signal to sort pixel data used for calculating the white balance gain; an integration unit which integrates the sorted pixel data by the color judgment unit and outputs the integration data; a first color judgment gate generating unit which generates a first color judgment gate to define an entire range of a target color temperature of the white balance adjustment; a second color judgment gate generating unit which generates a second color judgment gate to define a range of a target color temperature of the white balance adjustment with respect to each light source identified according to the white balance gain; a white balance fine adjustment starting instruction unit which makes an instruction to start fine adjustment in white balance in which the second color judgment gate is a reference for the color judgment; and a color judgment gate switching unit which performs the switching of the reference for the color judgment in the color judgment unit from the first color judgment gate to the second color judgment gate in response to the instruction caused by the white balance fine adjustment starting instruction unit, wherein the white balance fine adjustment starting instruction unit determines whether to start the fine adjustment depending on a comparison result of the integration data with a first threshold value which is set for the white balance adjustment based on the first color judgment gate, and determines whether to keep on performing the fine adjustment depending on a comparison result of the integration data with a second threshold value which is set for the fine adjustment based on the second color judgment gate.