Comments (2)
@felschr, perspectiveProjection
is a universal tool and can be used in simple crop cases too, but it might be overweight for a simple cropping use case.
GammaCV has no built-in crop operation, but it is possible to create your own. The implementation will depend on the details of your requirements, such like:
- do you want to change the crop coordinates "on the fly";
- does the size of the resulting image will always be the same as crop coordinates;
- etc.
Here is a guide on how to create an operation: https://gammacv.com/docs/create_operation.
The sample crop operation for a simple case might look like:
kernel.glsl
vec4 operation(float y, float x) {
return pickValue_tSrc(y + float(CY), x + float(CX));
}
crop.js
import * as gm from 'gammacv';
import kernel from './kernel.glsl';
export default (tSrc, x, y, w, h) => new gm.RegisterOperation('crop')
.Input('tSrc', tSrc.dtype)
.Output(tSrc.dtype)
.Constant('CX', x)
.Constant('CY', y)
.LoadChunk('pickValue')
.GLSLKernel(kernel)
.SetShapeFn(() => [h, w, 4])
.Compile({ tSrc });
This sample has kernel.glsl
, as a separate file for syntax highlight, if you are not using a bundler that could load glsl as js strings, then you should put the content of kernel glsl as a string variable. This implementation is just a sample, wasn't debugged, and does not contain boundary state control.
Here is this sample on CodePen: https://codepen.io/WorldThirteen/pen/gOozMVo.
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Since we have no near-tearm plans to create a built-in crop operation, I am closing an issue.
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