Ruiguang Wang

Application of image smoothing algorithm

With the application of CCD image sensor, the display effect of LED display panel is greatly improved. Due to the pixel response non-uniformity of CCD, it usually brings a “center dark, surround light” defect on LED display panel. Based on image smoothing algorithm, a calibration method for this defect is proposed in this paper. After calibration, the display uniformity deviation of LED display panel can be narrowed from 12.9% to 0.73%. Experimental results show that the method overcomes the inherent defect and achieves the desired effect.

The Deviation of Color Matching Algorithm in the Field of Full-Color LED Display

In this paper, a color gamut transformation method which transformed the different color gamut into a same one has been proposed. In the transforming process, the deviation which was arose from the quantization error and the truncation error were existing. If the deviation was out of the color tolerance, the uniformity of the screen color will be deteriorated. Firstly, the color tolerance of vision was calculated by the color-difference formula. Secondly, in the full-color LED display experiments, it was analyzed that the tri -color tolerance values are respectively 2.5, 2.8 and 1.3. According to the tri -color tolerance values and the color difference formula, the express of the quantization precision, gray value and the color difference was set up. Finally the gray-scale range of the color uniformity was analyzed by the collected data, it was concluded that the uniformity of the display was satisfied the requirement of the visual when the range of the gray level was (11, 14), and when the range was (1, 11), the value of the color difference was also reduced significantly.