Abstract: A method for adjusting a light source threshold value for face recognition is presented, including capturing an input image; calculating a first brightness value of the input image; loading a target image; loading a second brightness value of the target image; comparing the first brightness value with the second brightness value to obtain a brightness difference value between the input image and the target image; adjusting a basic threshold value according to the brightness difference value to obtain a recognition threshold value; and performing a face recognition process on the input image by using the recognition threshold value.