OPTICAL TEST METHOD

摘要

An optical test method captures an external appearance image of a target object, analyzes the captured image, and determines the presence or absence of a defect in the target object according to the analyzed result. The optical test method mounts different BPFs to several white lights, illuminates an illumination light signal on the test surface to acquire a wavelength band on which a lattice image is clearly shown, divides the acquired color image into several wavelengths, calculates individual phases of the divided images at the wavelengths, adds the calculated phases, calculates the added result as a single phase, analyzes the calculated single phase, and determines the presence or absence of a defect.