1. A recognition system, coupled to an image capturing device, that determines a first matching percentage by comparing a first live image with a first reference image, that determines a second matching percentage by comparing a second live image with said first reference image, that compares said first matching percentage with said second matching percentage to determine a direction of adjustment of a setting of said image capturing device, and that generates a feedback signal to adjust said setting based on said direction of adjustment, wherein said first live image and said second live image are captured by said image capturing device.