METHOD OF CONTROLLING ILLUMINATION USING IMAGE

A method for controlling illumination using an image is provided to control the quantity of light transmitted to an inspecting product uniformly by controlling the illumination of a light source according to a reference light quantity. A method for controlling illumination using an image includes the steps of: obtaining the images by photographing an inspecting sample to which light is irradiated by installing an area scanning camera adjacent to a defect inspecting unit(200); detecting the average brightness value of the obtained images(220); comparing the detected average brightness value and a reference brightness value(240,260); controlling a light source through an illumination controller according to the error between the average brightness value and the reference brightness value as the result of comparison(250,270); and using the brightness controlled light quantity from the controlled light source for defect detection(280).