闪光照相底片成像非线性校正技术研究

Nonlinear Correction Technique for Radiography Image

介绍了利用黑密度～穿透光程关系曲线对底片接收方式下的闪光照相图像进行非线性校正的方法.根据闪光照相成像原理,在光场均匀、散射均匀的条件下,图像的黑密度是照相客体的穿透光程的单调函数.当有一定的散射分布时,相当于校正图像中叠加了一本底成分,利用先验知识可以扣除.因此可以用黑密度～穿透光程关系曲线进行闪光照相图像的非线性校正.利用本方法对一三棱柱照相客体的图像进行了非线性校正,处理结果证实了该方法的有效性.

Principle of nonlinear correction for radiographic image by optic density vs. path length curve was introduced. By the principle of radiography, the function of the optic density and the path length was monotonous on conditional that the X-ray radiation and the scatter distribution were regular. So the optic density vs. path length curve could be used to correct the radiographic image. A background was added on the corrected image when the scatter distribution was non-regular. A radiographic image of triangle object was corrected using this method, and the results confirmed the method.