影像增强于跨媒体色彩管理系统之应用TheApplicationofImage.PDF

影像增強於跨媒體色彩管理系統之應用 The Application of Image Enhancement on Cross-Media Color Management System 羅梅君 林宗興 世新大學資訊管理學系 世新大學資訊管理學系 mcl@.tw crossfuture@ 摘要 Abstract 一般影像處理中所用到的影像增強模 Traditionally, in the field of image 式，僅針對影像所在的色彩空間作直接的 processing application, models, used in 增強(如RGB或CMYK)。如此不但未考慮到 image enhancement, only enhance the 影像在跨媒體複製時所會遇到的問題，也 images in interest in its device dependent color space (e.g. RGB or CMYK). Hence, 可能使增強的影像之色相有所改變。本研 the reproduced results on the enhanced 究中結合多媒體色彩管理系統並加入對於 images, obtained via cross-media 影像增強之研究，達到設備獨立、光源獨 reproduction system, often have hue changes. 立的影像增強演算法。研究中對四種不同 In this research, by the combination of 的影像增強模式(對比延伸法、S曲線對比 image enhancement, totally four algorithms 增強、銳利化、反銳化遮罩)經由心理物理 were derived based on both device 實驗以及 S-CIELAB色差公式作效能比 independence and illuminant independence. Those were algorithms of contrast stretching, 較，找出最佳的影像增強模式。 s-curve, sharpness, and unsharp mask. Also a set of psychophysical experiments and 我們將影像所在的設備從屬色彩空間 S-CIELAB was conducted to evaluate 搭配使用CIECAM02色外貌模式產生的ICC performances of models derived, and to find pro