Can we compare the size of two objects appearing in different images with different resolutions?
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1$\begingroup$ Kind of difficult unless we know some kind of scales to the distances in the image. $\endgroup$– NareshCommented Jun 10, 2013 at 9:49
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You must have some reference between the images, either some other similar elements or the camera parameters,
If you know the different resolutions that it is easy to calculate:
relative size = resolution ratio * object_size_ratio
otherwise you must have some other spatial reference between the images.
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$\begingroup$ This is what i thought. I was trying my luck because i did a fair bit of reading on this topic and found out what you said. Thanks for the help. $\endgroup$ Commented Jun 12, 2013 at 12:18