Hi GRASS users! I have an image of a small object (e.g. photograph of blue square 15x5cm) which I want to automatically georeference. In addition, the image contains 6 points where I know the exact coordinates, i.e. these points can be use as ground control points (GCP) for rectifying the image. This is basically a experimental setup, and I could use different colors or shapes for the GCP; the image itself will then be rather a photograph of a fish on a white background than a blue square; I just want to test with a simpler setup before.
However, as I want to automatize the step of rectifying/georeferencing I am looking for a way to autodetect these six points in the image. I am thinking of tools like pattern/face recognition that are able to autodetect objects (e.g. eyes, points etc.) and extract their position (coordinates) within that image. I assume these coordinates together with their "true" position could then be used for rectifying the picture using e.g. i.rectify. Has anyone done this or a similar exercise before and can recommend tools and approaches to auto-detect GCP from an image? Any hints are welcome! Best regards, Johannes
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