且获得的图像特征描述符具有旋转、平移、尺度不变性等优点，能够很好地描述图像的形状和空间分布信息。
And the image feature descriptor has a rotation, translation, scaling invariance, etc. it can be a very good to describe the shape and spatial distribution of information.
为了表示的图像的空间分布信息，一种疾病的矩阵，其具有的图像内容的旋转和平移的不变性，已被设计。
In order to represent the spatial distribution information of image, a disorder matrix, which has the invariance to the rotation and translation of the image content, has been designed.
该方法克服了传统刀口扫描法的缺陷， 消除了由于离散型光学元件的离散性产生的空间非平移不变性的影响，减小了测量误差，提高了精确度。
The method avoids the influence of non-isoplanantic result from the dispersancy position between the edge and the array for measured MTF, and its precision was improved accordingly.
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