| 摘要: | 自有顯示器產品以來，人類對於視覺上的要求與透過顯示器顯示出來的要求從沒停止過，一直朝向如何將色彩100%真實重現的路走，加上這幾年顯示器，光學與相關科技技術不斷的創新,使得近來各大研究單位以及廠商紛紛朝如何使人眼所看到的物與顯示器所呈現的結果達到一致；尤其在色彩精確、色彩再現方面的研究不斷的有新發現，使顯示器更逼近人眼所看到的真實畫面，因此色彩能否忠實呈現是評價顯示器品質之重大指標。在這篇論文中將探討在CIE1976 (L*,a*,b*)表色系統下Gamma Curve 與最低位元深度(Bit Depth)的關係進而使CDI(Color Distribution Index)達到100%以呈現出真實色彩。首先介紹人眼的對亮度色彩感知能力，以及本文所使需用到的色彩理論，CIE1931 RGB, CIE1931 XYZ, CIE1931 Lxy, CIE1931 Lu’v’, CIE1976 L*a*b*, 與Gamma曲線與色域邊界如何描繪。介紹色彩分佈指標理論，使用不同的位元深度對CDI的影響，不同的亮度、不同的對比對色彩分佈指標(CDI)的影響又是如何及此理論仍需再探討的部分，然後提出解決方案，由Lu'v'表色系統下需要12位元深度才能達到CDI=100%，轉換成L*a*b*色彩空間後，加上S型Gamma曲線只需要到11位元之位元深度也可以到達CDI=100%，經由程式模擬結果與實驗結果來驗證提出的解決方案之效果。 Since there are display products at marketing, the mankind, to demanding and never stopping through the requirement that the display revealed on the vision, move towards 100% true color reproducing way, during these years, innovation that optics and relevant science and display technology are constant, make every research center recently and manufacturer to get the result that display appear and human eye see reach same picture quality, new discoveries constantly to especially reproduce the research of the respect in color accuracy, color reproducing, make display approach true picture human eye see even more, so color could faithful be appeared, will be the quality indicator of display device. In this paper we will probe into Gamma Curve and the most low-order depth (Bit Depth) relation then achieve CDI (Color Distribution Index) =100%, in order to demonstrating 100% true color, at CIE1976 (L*, a*, b*) colour system. Introduce human eye perceiving ability first, and the color theory used , CIE1931 RGB, CIE1931 XYZ, CIE1931 Lxy, CIE1931 Lu’v’, and CIE1976 L*a*b*, how describe Gamma curve and colour gamut boundary, color distribution index theory, use different bit number to check CDI result, and what’s the result for different luminance, contrast ration and the part that this theory still need to probe into again, then propose the solution, at Lu’v’ color appearance, to archive CDI=100% display need to use 12 bits, but for L*a*b* color space, implement S Gamma curve, only need 11 bits to reach CDI=100%. And verify the solution put forward via the simulation result of the procedure and experimental result. |
