Relation between Image Quality and White Balance Shift against Gray Level in LCDs. Evaluation on Face Colors.
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- Tamura Tohru
- Department of Image Information Engineering, Tokyo Institute of Polytechnics
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- Ohishi Iwao
- Department of Image Information Engineering, Tokyo Institute of Polytechnics
Bibliographic Information
- Other Title
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- 液晶ディスプレイにおける白色色度点の階調に対する変化と画質の関係 肌色評価への影響
- エキショウ ディスプレイ ニ オケル ハクショク シキドテン ノ カイチョウ ニ タイスル ヘンカ ト ガシツ ノ カンケイ ハダイロ ヒョウカ エ ノ エイキョウ
- Evaluation on Face Colors
- 肌色評価への影響
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Abstract
Liquid-crystal displays (LCDs) are now widely used as computer display devices. Among them, twisted nematic (TN-mode) and super twisted nematic (STN-mode) displays are the most popular. The spectral transmittance of these LCDs, however, depends on the gray tone level so the gray tone color becomes bluish. We have therefore investigated the quality of the displays and in this study we focus on face color quality. We prepared test images by using a software program to add blue into the image data. Five different bluish levels were used in simulated TN-mode and STN-mode displays. Nine portraits were selected as the testing images. Test participants were asked to judge the quality of the faces according to a five-grade scale and judge the amount of blue according to an impairment scale. These test results show that face color quality is significantly affected by the bluish level of gray tones and that face-color quality is good when no blue is perceived in the face color. We then compared the simulated face color quality with the gray-tone chromaticity of three current TN-mode LCDs, and we found that two of them will be able to display good face colors.
Journal
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- The Journal of The Institute of Image Information and Television Engineers
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The Journal of The Institute of Image Information and Television Engineers 54 (1), 93-100, 2000
The Institute of Image Information and Television Engineers
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Details 詳細情報について
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- CRID
- 1390282680075083008
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- NII Article ID
- 110003692657
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- NII Book ID
- AN10588970
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- ISSN
- 18816908
- 13426907
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- NDL BIB ID
- 4969981
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed