Automated color inspection system for color CRT displays

An automated white uniformity inspection system for high-resolution color CRTs (cathode ray tubes) was developed. White uniformity is the general evaluation of whiteness on CRT screens and is especially important for CRTs used in computer display terminals. A color television camera was used to obtain color data on a CRT screen at high speed. Perceptual color differences on chrominance signal color space are discussed. An algorithm for white uniformity inspection is presented using the chrominance signals. Color contrast between a defect region and the background, hue, area, and edge strength of the defect was used for the evaluation. The validity of the algorithm has been verified by experimental results