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add dataset of door crops, for model training

real_crops_dataset/README.md

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+# Dataset for training a door orientation detection model
+
+This dataset contains raster images that show crops taken around detected doors.
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+There are 3 cases: double door, single door opening to the left, single door opening to the right.
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+The crops were obtained with the code in `crop_extractor_for_cnn_dataset.py`
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+The orientation of the door is always door sill at the bottom, door opening upwards.
+(If you see a door opening downards it's another, upper door that appears in the crop area).