臺灣博碩士論文加值系統

半色調影像是對連續調影像處理，是一種破壞的運算，然而運用傳統的影像品質評估計算法來評估，如MSE等方法並不適用。加上半色調影像的產生通常會考慮人眼模式以及傳統評估方法評估的結果與人眼模式不完全符合，故在評估半色調影像時必須完整考慮人眼視覺系統。
半色調影像的破壞大多會在影像的銳利度、網點規則性以及在低頻的平滑區域顯現，而這些破壞會嚴重的影響到影像的品質，故為了符合人眼視覺系統以及有效的評估出半色調對於銳利度、網點規則性及蟲紋(Worm)造成的品質破壞，半色調影像品質評估必須考慮影像結構相似性，本研究利用現有的連續階調影像之品質評估方法，整合出適合用於半色調影像品質評估的方法，並且利用心理物理實驗透過多元迴歸來驗證本研究整合的評估模式是否與人眼有一致性。

The halftone image is to manipulate a continuetone image, with bi-level tone quantization resulting a halftoned image. The traditional image quality, such as MSE and so on is not appropriate to assess halftoned image. In halftone images assessment, the human vision system must be considered, but the traditional image quality assessment methods do not measure human vision system which result in assessment error
The halftone images usually destroy detailed information of images, yields regularity in the area of low frequency perceived as moiré or worm, which cause severe image on quality.

Therefore, halftone image quality assessment must consider structural
similarity of images. This study uses a number of image-quality assessment
methods to form a suitable halftoned color image quality assessment method.
To test if proposed method and human vision system is consistent, some
physical and psychological experiments through the multiple regression is
utilized.

第一章緒論.......................................................... 1
1.1 研究背景與動機.................................................. 1
1.2 研究目的........................................................ 1
第二章文獻探討...................................................... 3
2.1 半色調(Halftone) ............................................... 3
2.1.1 墨點CSF Model ................................................ 3
2.1.2 半色調技術.................................................... 4
2.1.3 半色調技術對影像的破壞........................................ 8
2.2 影像品質評估方法................................................ 10
2.2.1 一般品質評估方法：MSE、SNR ................................... 10
2.2.2 結構相似度比較................................................ 11
2.2.3 色彩空間...................................................... 15
2.3 評估方法........................................................ 17
第三章研究方法...................................................... 29
3.1 選擇影像........................................................ 30
3.2 影像品質評估.................................................... 33
3.3 心理物理實驗.................................................... 37
第四章實驗結果與分析................................................ 40
4.1 多元迴歸說明.................................................... 40
4.2 評估結果值...................................................... 41
4.2.2 迴歸結果分析.................................................. 49
第五章結論與未來研究方向............................................ 52
第六章參考文獻...................................................... 55
附錄.................................................................57

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