It can also calculate the distance between the image and the template features, and determine the category with the minimum distance method. However, in general, the imaging conditions of each image used for matching are different, resulting in large noise interference, or after image preprocessing and normalization, the gray level of the image or the position of the pixel point changes. In the actual design of the template, it is based on the internal characteristics of the shape of each region, highlighting the differences between similar regions, and taking into account the factors such as noise and displacement that are easy to produce in the process of processing. The above problems can be avoided by constructing templates based on the invariant features of images.<br>
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