Reference Image |
This is the image against which the layer will be
transformed. |
Transformation Model |
This parameter specifies how to transform the image.
Shift and Rotate instructs
the tool to only use a rigid body transformation,
which is a combination of translation (shift) and
rotation (preserving all lengths and angles, 3
degrees of freedom). Affine
Transformation is a combination of rotation,
scaling or shear, and translation
(6 degrees of freedom). |
Matching Area |
This parameter specifies whether to take into account
the whole layer or only the selected parts of it as match
criteria for calculating the transformation parameters. |
Accuracy |
This is the threshold indicating the desired accuracy of
the transformation parameters. It is given as an integer
indicating the number of digits behind the decimal point
(e.g., 6 indicates an accuracy of 10-6). The tool
will stop iterating as soon as the (normalized) difference
between the transformation parameters in two subsequent
steps becomes smaller than this value. |
Iterations |
This is the number of steps after which the tool will
stop unconditionally. It is used for terminating the
registration process in non-convergent situations. The layer
remains unchanged if the process stops in this way, i.e.,
before reaching the specified accuracy. Another means for
stopping the process is to press the Cancel button, which will also
leave the layer unchanged. |
Interpolation |
This parameter specifies the interpolation method used for
rendering the transformed image:
None |
No interpolation (take the value of the nearest
neighbor) |
Linear |
Bi-linear interpolation |
Cubic |
Bi-cubic interpolation |
Sinc (Lanczos) |
Lanczos interpolation |
|
Clipping |
This parameter determines how to clip the transformed image:
Adjust |
Enlarge the layer to contain the transformed image |
Clip |
Delete all parts of the transformed image which
exceed the image boundaries |
Crop |
Crop the layer to contain only the non-empty parts
of the transformed image |
Crop with Aspect |
Same as Crop, but
conserving the aspect ratio of the original image |
|