| 光谱学与光谱分析 |
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| Spectrum Analysis and Measurment Research on Visual Density of the National Standard Densitometer |
| LIU Zi-long1,2, CHEN Rui2, LIAO Ning-fang1, LI Zai-qing2, WANG Yu2 |
1. National Professional Laboratory of Color Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2. Optical Division, National Institute of Metrology, Beijing 100013, China |
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Abstract Visual density is an important index for the estimation of photographic film and visual photo. The development of biomedical image and macromolecule image needs high measurement uncertainty of visual density in spectrum characteristic. The ISO standard of visual density measurement conditions was modified in 2001. A series of equipments designed for densitometer enhance the spectral matching between the national standard densitometer and the ISO standard function. And a new measurement formula is given based on theory analysis. According to the measurement data and uncertainty analysis, the combined uncertainties are 0.001 1 (0<D<4.0) and 0.003 1 (4.0≤D<6.0).
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Received: 2012-06-11
Accepted: 2012-09-12
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Corresponding Authors:
LIU Zi-long
E-mail: liuzl@nim.ac.cn
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