Comments (4)
pGit1
commented on May 22, 2024
Looking at this site I guess I could have simplified this by asking for shearing in the Y direction not just the X. Perhaps this library already does that!
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aleju
commented on May 22, 2024
What you want sounds like a transformation that moves two corners of the same image side closer together, similar to shear in the images, just applied to two sides at the same time.
I guess the easiest way to achieve that might be PiecewiseAffineTransform (see example), with the original image corners as source points and the new image corners (with two of them closer together) as the target points.
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pGit1
commented on May 22, 2024
Actually this is an extremely powerful transformation I just did not know
how to begin to describe it. However the transform I describe above seems
much more simple by comparison. Instead of shearing an image in the X
directions I was wondering if there was a way to do it in the Y direction
so an image could be transformed similar to a door opening and closing in
space.
…On Sat, Apr 1, 2017 at 3:37 PM, Alexander Jung ***@***.***> wrote:
What you want sounds like a transformation that moves two corners of the
same image side closer together, similar to shear in the images, just
applied to two sides at the same time.
I guess the easiest way to achieve that might be PiecewiseAffineTransform
<http://scikit-image.org/docs/dev/api/skimage.transform.html#skimage.transform.PiecewiseAffineTransform>
(see example
<http://scikit-image.org/docs/dev/auto_examples/transform/plot_piecewise_affine.html>),
with the original image corners as source points and the new image corners
(with two of them closer together) as the target points.
—
You are receiving this because you authored the thread.
Reply to this email directly, view it on GitHub
<#27 (comment)>, or mute
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aleju
commented on May 22, 2024
You can probably simulate that door effect with PiecewiseAffineTransform. The current Affine augmenter has a shear parameter, but that one maps to AffineTransform's shear parameter. Their doc says about it just Shear angle in counter-clockwise direction as radians, so not sure if it is x- or y-direction shear.
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Related Issues (20)
- Script takes over one hour to install through pycharm on 224GB 24CPUs DSVM HOT 1
- [Enhancement] Comment in imgaug/augmenters/_init_.py is not correct
- Customize image augmentation HOT 1
- Assigning Probability in imgaug OneOf HOT 1
- Add distortion/fisheye effect
- Project dependencies may have API risk issues
- Is this project abandoned? HOT 8
- how to use imgaug to aug single image just one time?
- Out Of Memory (OOM) error in perspective transformation
- Support for Oriented Bouding Boxes
- AttributeError: module 'imgaug.augmenters' has no attribute 'LinearmnContrast' HOT 1
- numpy 1.20 bool deprecation HOT 1
- AttributeError: 'FigureCanvasAgg' object has no attribute 'set_window_title' HOT 2
- PIL version leads to immutable error
- It doesnt support latestversion of numpy HOT 2
- Track Random Augmentations as They Are Applied
- how to generate such image effect from clear images? I want to simulate scanner effects
- ImportError: cannot import name 'QhullError' from 'scipy.spatial' (/opt/conda/lib/python3.10/site-packages/scipy/spatial/__init__.py) HOT 3
- [BUG] show_grid and draw_grid are incompatible
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