Auto white balance adjusting method and auto white balance adjusting system for calibrating images by using dual color spaces

An auto white balance adjusting system comprising:

• an image capturing device configured to acquire an image;
• a memory configured to save data;
• an output device configured to output a white balance adjusted image;
• and
• a processor coupled to the image capturing device, the memory, and the output device and configured to control the image capturing device, the memory, and the output device;
• wherein after the image capturing device acquires the image, the processor determines a white pixel area according to a standard of a first color space saved in the memory, the processor selects a plurality of pixels of an image according to the white pixel area, the processor generates an average color value of the plurality of pixels in the first color space, the processor converts the average color value in the first color space to three primary color gains in a second color space, the processor generates three primary color target gains according to the three primary color gains and a color temperature curve, the processor gradually adjusts a white balance of the image to meet the three primary color target gains according to the average color value in the first color space and the three primary color gains in the second color space, and the processor controls the output device to output the white balance adjusted image.