How to Get Coordinates of Sub-Images from a Larger Image
Overview I had an opportunity to obtain the coordinates within a larger image from multiple cropped sub-images. This article is a memo summarizing the method for doing this. I introduce a method using OpenCV’s SIFT (Scale-Invariant Feature Transform) to perform feature point matching between template images and the original image, estimate the affine transformation, and obtain the coordinates. Implementation Required Libraries pip install opencv-python numpy tqdm Python Code The following code matches template images (PNG images in templates_dir) against a specified large image (image_path) using SIFT, and obtains the coordinates within the original image. ...