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I was using the tensorflow android example which has a placeholder for the location of a ROI (see tensorflow/examples/android/src/.../Classifier.java), but it is not used. I would like to be able to locate the ROI of the classified object. I looked through the code, but it wasn't obvious how the location could be determined. Does tensorflow support this?
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Unfortunately that placeholder is not populated, and actually determining the region of interest of an object is still a hard research problem. We don't currently have a released example of a model that can do that in TensorFlow, but if you want to look through the research, the term to look for is 'localization'.
There's a related question you might find helpful here:
Does Convolutional Neural Network possess localization abilities on images?