AI-generated Key Takeaways
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Computes local image displacements for registration while allowing rubber sheet deformations.
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Displacements are computed in the reference image's CRS at a scale based on the lowest resolution of three projections: input, reference, and requested.
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The resulting displacements are transformed into the user-specified output projection.
| Usage | Returns |
|---|---|
Image.displacement(referenceImage, maxOffset, projection, patchWidth, stiffness) | Image |
| Argument | Type | Details |
|---|---|---|
this: image | Image | The image to register. |
referenceImage | Image | The image to register to. |
maxOffset | Float | The maximum offset allowed when attempting to align the input images, in meters. Using a smaller value can reduce computation time significantly, but it must still be large enough to cover the greatest displacement within the entire image region. |
projection | Projection, default: null | The projection in which to output displacement values. The default is the projection of the first band of the reference image. |
patchWidth | Float, default: null | Patch size for detecting image offsets, in meters. This should be set large enough to capture texture, as well as large enough that ignorable objects are small within the patch. Default is null. Patch size will be determined automatically if not provided. |
stiffness | Float, default: 5 | Enforces a stiffness constraint on the solution. Valid values are in the range [0,10]. The stiffness is used for outlier rejection when determining displacements at adjacent grid points. Higher values move the solution towards a rigid transformation. Lower values allow more distortion or warping of the image during registration. |