Abstract:In order to shorten the test time of polarizer in LCD production, to meet the demand of dynamic cutting in subsequent production, the realtime polarizer defective region detection system was developed. In the system, a linear motor platform was used to transfer the finished polarizer product, it triggered an 8k linear scan camera to pick up images at a fixed scan frequency, the defective region detection of the pickedup image was done by the synchronization processing section. The defective images were cut with the adaptive thresholds, then the defective images were grouped and marked the position range, by using the improved rapid clustering algorithm based on density. Finally, the image process and the markup programs were processed in parallel by the dualcore CPU, to realize the function of immediate defect detection. The experiments show that, at the speed of 70 mm/s of the detection platform, a single CCD can continuously process the defect detection and clustering of polarizer images with a width of approximately 57 mm per second, meeting the production demand.