On 06/10/16 11:59, Johannes Radinger wrote:
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?
I've never used it, but there's i.points.auto in the addons:
https://grass.osgeo.org/grass70/manuals/addons/i.points.auto.html
Moritz
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