Perceptibility Enhancement of LCD Images Under Dim Backlight

• Main Authors: Tai-Hsiang Huang, 黃泰翔
• Other Authors: 陳宏銘
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/66450374309454831626

碩士 === 國立臺灣大學 === 電信工程學研究所 === 96 === Maintaining image quality under various lighting conditions is critical to portable multimedia devices. In this thesis, an image enhancement algorithm is proposed to deal with extremely dim LCD backlight under which the image often becomes imperceptible. The crux of our idea is to keep the detail content of the image in the visible luminance range. To do that, just noticeable difference (JND) theory is used to form a two-layer image decomposition architecture for extracting the details, and a boosting scheme is applied to the details that are in the low intensity luminance regions of the image. Experimental results have shown the superiority of the proposed algorithm.