中文摘要：

针对现有研究中刃边地物选取的主观性比较强的问题,提出用Canny边缘探测器得到二值边缘图，再应用Hough变换得到候选刃边，最后通过候选刃边倾斜角度判断的方法，来自动提取高分遥感影像上满足刃边法测定要求的刃边地物。结果表明，应用该方法能够得到精度较高的高空间分辨率遥感成像系统的调制传递函数参数值。

英文摘要：

In order to avoid the subjectivity of the extraction of the knife edge objects in the existing researches,an approach was proposed for extracting the required knife edge objects automatically. Firstly,the binary edge map of the image can be obtained using the Canny edge detector. Then, the Hough transform was applied to the binary edge map. Thus,the candidate knife edge objects can be obtained. By judging whether the candidateknife edge objects have the appropriate angles of inclination, the required knife edge objects can be extracted automatically. The experimental results show that the MTF value of the high spatial resolution remote sensing imaging system can be measured accurately by using the proposed approach.