subtraction image

基本解释

The quality of the subtraction image is improved by the multi exposure.
采用多次曝光技术，提高了相减象的质量。
The quality of the subtraction image was improved and computation time was reduced by selecting edge pixels as triangular control points.
通过计算图像梯度信息，选取边缘区域像素作为控制点，既改善减影图像质量，又提高运算速度。
The results show that the phenomenon of mackling rails can be detected accurately, and also the category of mackling rails and the offset can also be determined by analysis of the subtraction image.
结果表明：此方法可以较准确地检测出重影现象，还可以通过分析减影图来确定重影的种类和偏移量。