Lighting source device of adaptive regulating light-intensity in machine visual measuring system

This invention discloses an illumination light source device for adaptively adjusting light intensity composed of an image card, a computer, PWM control circuit, LED light source and a light source main circuit, among which, the data output end of the image card is connected with the input end of the computer its output end is linked to the input end of PWM control circuit, its output end is connected with the control end of the light source main circuit, output of which is linked to the input of LED source, its operation module is formed by an image quality quantization process unit computing image gray standard difference and variance functions according to signals input by the card and maximum unit of the optimum supply current corresponding value.