臺灣博碩士論文加值系統

印刷式彩色濾光陣列電子紙具有快速驅動和準確色彩控制的優勢。然而，它的色域比多色彩電子紙狹窄，且輸出響應曲線通常是非線性的，這導致顏色和色調再現困難。本論文討論了傳統影像處理流程在這種新型彩色電子紙上的應用問題，並提出了解決非線性響應問題的方法。通過這種新影像流程，可以顯著改善顯示品質。

The color electronic paper (e-paper) based on a printed color filter array offers the advantage of rapid driving capability and accurate intensity control for each color channel. However, its color gamut is comparatively narrower than that of multi-pigment color e-paper, and the output response curve is generally nonlinear. This leads to difficulties in color and tone reproduction when displaying an image on this new color e-paper. This paper discusses the practical issue of applying the traditional image processing pipeline to this new color e-paper and proposes an alternative approach to address the nonlinear response issue in printed color e-paper. With the proposed image pipeline, significant improvements in display quality can be achieved.

Chapter 1 Introduction 1
1.1 Background 1
1.2 Objectives 4
1.2.1 Colorimetric Device Model of CFA e-Papers 5
1.2.2 Image Processing of Color Reproduction for CFA e-Paper 5
1.2.3 CFA e-Paper Halftoning 6
1.3 Thesis Structure 7
Chapter 2 Literature Review 8
2.1 Color Correction Matrix 9
2.2 Gamut Mapping 12
2.3 Device Colorimetric Characterization 14
2.4 e-Paper Halftoning 16
2.4.1 Nearest Neighbor Search 17
Chapter 3 Methodology 19
3.1 Device Characterization 19
3.1.1 Monotone Piecewise Cubic Interpolation 22
3.1.2 Monotone Piecewise Bicubic Interpolation 24
3.1.3 Interpolation for Device Colorimetric Model 27
3.2 Image Processing Pipeline 29
3.3 Color Enhancement 29
3.4 Tone Reproduction 32
3.5 Gamut Mapping 34
3.6 Halftoning Technique 40
3.6.1 Nearest Neighbor Search 41
Chapter 4 Experimental Results 44
4.1 Experimental environment and equipment 44
4.2 Gamut mapping results comparison 44
4.2.1 Statistical comparison of gamut mapping results 47
4.3 Comparison of results for color enhancement and tone reproduction 48
4.3.1 Color difference comparison 50
4.4 Comparison with traditional pipeline output results 50
Chapter 5 Conclusions and Future Work 53
5.1 Conclusion 53
5.2 Future Work 53
References 54

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