1998 Fiscal Year Final Research Report Summary
DESIGN OF IMAGE QUALITY FOR ELECTRONIC ENDOSCOPE BASED ON HUMAN PERCEPTION
| Project/Area Number |
08455031
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
MIYAKE Yoichi CHIBA UNIV., DEPT.ENG., PROFESSOR, 工学部, 教授 (70027895)
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| Co-Investigator(Kenkyū-buntansha) |
TSUMURA Norimichi CHIBA UNIV., DEPT.ENG., RESEARCH ASSOCIATE, 工学部, 助手 (00272344)
HANEISHI Hideaki CHIBA UNIV., DEPT.ENG., ASSOCIATE PROFESSOR, 工学部, 助教授 (20228521)
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| Project Period (FY) |
1996 – 1998
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| Keywords | ENDOSCOPE / REFLECTANCE SPECTRA / MUCOUS MEMBRANE / IMAGE QUALITY / COLOR REPRODUCTION |
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| Research Abstract |
It is our goal to improve the image quality, particularly color reproduction of electronic endoscopes. To achieve our goal, we have developed the endoscopie spectrophotometer to measure the spectral reflectance of gastric mucous membrane. Three hundred and ten spectra have been analyzed by principal component analysis. The results indicate that the reflectance spectra can be adequately described using only three principal components. Based on the above experimental result, it is shown that the spectral reflectance of gastric mucous membrane can be calculated from the R, G, B signals of the conventional electronic endoscopes. Therefore, spectral reflectance of all pixels in gastric mucous membrane taken by electronic endoscopes can be estimated less than the average color difference DELTAE^*_<uv>= 2.66 in the L^* u^* v^* color space. Then computer simulations of the color reproduction of' electronic endoscopes were performed, and the resulting spectral characteristics under different illuminants are described and analyzed. We also proposed a new method to design mosaic filters on CCD area sensor by using the reflectance spectra of gastoric mucous membrane.
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