Blot Algorithm for Cutouts¶
A module that provides blotting algorithm for image cutouts and a default WCS-based coordinate mapping class.
| Author: | Mihai Cara (for help, contact HST Help Desk) |
|---|---|
| License: | LICENSE |
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class
subpixal.blot.BlotWCSMap(source_cutout, target_cutout)[source]¶ Coordinate mapping class that performs coordinate transformation from the source cutout to the “target” cutout. The target cutout simply provides a coordinate system. This class implements coordinate transformation in the
__call__()method.Parameters: - source_cutout : Cutout
A cutout that defines source coordinate system (input to the
__call__(x, y)method).- target_cutout : Cutout
A cutout that provides target coordinates system to which source coordinates need to be mapped.
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subpixal.blot.blot_cutout(source_cutout, target_cutout, interp='poly5', sinscl=1.0, wcsmap=None)[source]¶ Performs ‘blot’ operation to create a single blotted image from a single source image. All distortion information is assumed to be included in the WCS of the
source_cutoutandtarget_cutout.Parameters: - source_cutout : Cutout
Cutout that needs to be “blotted”. Provides source image for the “blot” operation and a WCS.
- target_cutout : Cutout
Cutout to which
source_cutoutwill be “blotted”. This cutout provides a WCS and an output grid.- interp : {‘nearest’, ‘linear’, ‘poly3’, ‘poly5’, ‘spline3’, ‘sinc’}, optional
Form of interpolation to use when blotting pixels.
- sinscl : float, optional
Scale for sinc interpolation kernel (in output, blotted pixels)
- wcsmap : callable, optional
Custom mapping class to use to provide transformation from source cutout image coordinates to target cutout image coordinates.