LCD electronic instrument has been widely used in industrial production because of its accurate indication and strong antiinterference ability. According to the display characteristics and display principle of LCD, proposes an adaptive color morphology preprocessing method based on information entropy, and enhances the LCD region segmentation based on HSV space and hue mapping V channel, and combines the region image enhancement algorithm of dual channel image weighted fusion to realize the segmentation of LCD position region. The experimental results show that, compared with the traditional segmentation scheme, the segmentation accuracy of the proposed method is improved by 8. 6% for monochromatic LCD and 12. 4% for color LCD.