The color reproduction of electronic endoscopes is poor compared to the conventional optical endoscopes which use color film. It is our goal to improve the color reproduction of electronic endoscopes. To achive our goal, we have developed the endoscopic spectrophotometer to measure the spectral reflectance of the gastric mucous membrane. The resulting data is then used in computer simulations. Three hundred and ten spectral reflectances have been measured and 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 results, it is shown that the spectral reflectances of the gastric mucous membrane can be calculated from the R, G, B signals of a conventional electronic endoscope. Computer simulations of the color reproduction of electronic endoscopes were performed and the resulting spectral characteristics under different illuminants are described and analyzed.
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