blue-oil/blueoil

Coordinates of gt_boxes are invariant after augmentation related to coordinates transformation

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#60 opened on Dec 5, 2018

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Description

Coordinates of gt_boxes are invariant after augmentation related to coordinates transformation, "Pad", "Rotate" and "Crop". Here is the examples on "Pad". The coordinates of gt_boxes and shifted images are not match:

On "Pad", I fixed it by adding the code to __call__method like this:

        gt_boxes[:,0] = gt_boxes[:,0]+self.left
        gt_boxes[:,1] = gt_boxes[:,1]+self.top

and modifiiied the argument and the return value accordingly.

Then, it works well.

Likewise, I think "Rotate" and "Crop" should be modified accordingly.

Contributor guide

Research direction
Ensure that augmentation methods like Pad, Rotate, and Crop update the bounding box coordinates accordingly. For Pad, the fix is to add offsets to gt boxes. For Rotate and Crop, similar coordinate transformations are needed.
Tech stack
python
Domain
machine learningai
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70