基于Hough变换的光学测量胶片成像质量评价方法

感光特性曲线是评价测量胶片影像质量密度变化均匀性的一种手段和方法.针对光学测量胶片传统评价方法主观性强、误差大、难以量化等问题,提出了利用Hough变换技术对胶片感光特性曲线进行空间变换,通过分析检测特性曲线的变化规律及斜率和断线率等评价指标,对光学测量胶片成像质量进行评价的方法.并采用2条成像质量不同的21梯级光楔胶片进行实验.实验结果表明,此方法评价结果准确、客观性强,能够真实地反映光学测量胶片的成像质量.

Imaging Quality Evaluating Method of Optical Measurement Film Based on Hough Transform

The photo sensitive characteristic curve is one quality evaluating method of measuring film.Aiming at the strong subjectivity,big error,quantitative difficulty of the traditional evaluating method,the imaging quality evaluating method of optical measurement film was put forward,using Hough transform technology to make a space shift for the film photo sensitive characteristic curves, and evaluating the indexes of characteristics by analyzing and testing the changing rules,slope,broken-line rate of the characteristic curves.The experiment was done using two different imaging quality wedge films of 21 steps,the results prove the evaluating results are more correct and objective,it can truly reflect the imaging quality of the optical measurement film.