To avoid the issue caused by the different sizes of the template and original image we can use multiscaling. In the case where, just because the dimensions of your template do not match the dimensions of the region in the image you want to match, does not mean that you cannot apply template matching.

OpenCVtemplate Matching

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Template matching is a technique for finding areas of an image that are similar to a patch (template). A patch is a small image with certain features. The goal of template matching is to find the patch/template in an image. To find it, the user has to give two input images: Source Image (S) – The image to find the template in, and Template Image (T) – The image that is to be found in the source image.