模糊和散射对闪光照相边界检测的影响

借助蒙特卡罗方法模拟闪光照相过程，研究了模糊和散射因素对边界检测的影响。结果表明:模糊与边界退化量的变化关系依赖于相邻飞层的材料、密度和尺寸；相同客体结构下，模糊越大，边界退化量也越大；客体结构不同，相同模糊下的边界退化量也不同；散直比越大，散射对边界检测结果的影响也越大，当散直比大于50时，散射引起的边界检测误差超过1个像素。

Effects of blur and scattering on boundary detection of flash radiography

Owing to the effect of non-ideal factors in the imaging process, X-ray photographic image quality is degraded, resulting in a shift of image boundary position relative to that of the object. In this paper, the Monte Carlo method is used to simulate the flash photography process, and the influence of fuzzy and scattering on the boundary detection is studied. The result shows that the relationship between the blur size and the boundary deviation is dependent on the material, density and size of adjacent layers; under the same object structure, the larger the blur, the greater the boundary deviation; when the object structure is different, the boundary deviation is also different with the same blur size. The greater the ratio of scatter to direct, the greater the effect of scattering on the boundary detection results. When the ratio is greater than 50, the boundary detection error caused by scattering is more than one pixel.