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한국펄프·종이공학회 한국펄프종이학회 기타 간행물 Pre-symposium of the 10th ISWPC
발행연도
1999.6
수록면
198 - 203 (6page)

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Versatility of a desk-top flat-bed image scanner with a transparency unit as an image input device for formation analyses was exhibited and discussed. If the scanner output under satisfied prerequisite conditions is calibrated based on a standard film or by comparison to Elrepho type reflectometer, the scanner was found to provide reasonably scaled gray levels. However, there remained some distortion in the output characteristics even after the calibration. So, unlike Elrepho type, optical density squared was almost proportional to the basis weight of paper. Formation of handsheets was quantitatively analyzed with the light transmission images obtained by the scanner. The formation index, the standard deviation of optical density squared correlated better with the subjective ranking than that of optical density or of gray level. Optical density squared divided by the basis weight showed the highest Kendall's coefficient of correlation. Anyway, the standard deviation of gray level was far from propriety as a formation index.

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