Comments (3)
The expectation that "imrotate(img, pi/2)
should have the same size as img
" can be somehow illusive due to the numerical error. A trick we use in this package is to discretization on ratio so that we consistently have imrotate(img, theta) == imrotate(img, theta+2pi)
but that doesn't handle special pi/2
, pi
and 3pi/2
case.
ImageTransformations.jl/src/warp.jl
Line 247 in 4d89e5c
To get the same size you can use imrorate(img, π/2, axes(img))
.
Would it make sense to just define a new imrotate specifically for these factors of pi/2?
Yes it totally makes sense, I did some experiment a long time ago in #79 but there are performance concerns.
from imagetransformations.jl.
Would it make sense to just define a new imrotate specifically for these factors of pi/2?
There're Base functions rotl90
, rotr90
and rot180
for this very purpose. In the meantime, I still think #79 is needed.
I believe that we also need more documentation on this behavior because other image processing frameworks don't have this axes
stuff.
from imagetransformations.jl.
This is also fixed by #148
from imagetransformations.jl.
Related Issues (20)
- Does ForwardDiff work with ImageTransformations? HOT 3
- demo: grid stretching and elastic transformation
- add swirl function HOT 1
- Images getting generated differently HOT 4
- No stable version document is deployed HOT 6
- Add `Projective` transformation HOT 2
- Demos using CoordinateTransformations and Rotations
- Repeated warping HOT 6
- Clarification of rotations HOT 7
- Rotation operation is inaccurate HOT 2
- Custom image transformation? HOT 4
- imresize without interpolation for integer upscaling
- imflip function
- The reference frame associated to an image is not the best one to perform a shear transformation HOT 6
- Support for autodiff in warping?
- Support v0.15 of Interpolations.jl HOT 1
- Warp seems to be off HOT 1
- Add docs for imresize!
- Cropping after warp HOT 2
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from imagetransformations.jl.