An Edge Aware Image Compression Technique for LCD Overdrive Applications

• Main Authors: Hui-Fu Chen, 陳惠甫
• Other Authors: Chung-Hsun Huang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/89179869128022363840

碩士 === 國立中正大學 === 電機工程研究所 === 101 === Overdrive technique is widely used to reduce the gray-to-gray level response time of liquid crystal display (LCD). To supply a high or low enough driving voltage for the liquid crystal cell to twist in time, the pixel data of the previous frame should be used as reference to be compared with the pixel data of the current frame. These pixel data are usually stored in the off-chip frame buffer, which is dynamic random access memory (DRAM) usually. Image compressions with low distortions, therefore, are used to apply overdrive technique with consuming a sufficient low DRAM bandwidth. In this thesis, we propose a new low distortion and high compress ratio image compression technique with preserving the edge information so as to avoid inducing artificial edges after overdrive technique is applied. Furthermore, the new DPCM based edge aware compression technique use only 0.5 line buffer so that the hardware complexity is reduced. Performance evaluations show that the PSNR of 37.57 dB, 37.11 dB, and 36.71 dB are achieved for the image compression of 4, 5, and 6, respectively.