SunPy image¶

The image submodule contains routines to process images (i.e. numpy arrays). The routines in this submodule are generally exposed through map-specific functions in other places.

sunpy.image Package¶

sunpy.image.resample Module¶

Image resampling methods.

Functions¶

`resample`(orig, dimensions[, method, center, …])	Returns a new `numpy.ndarray` that has been resampled up or down.
`reshape_image_to_4d_superpixel`(img, …)	Re-shape the two dimension input image into a a four dimensional array whose first and third dimensions express the number of original pixels in the “x” and “y” directions that form one superpixel.

sunpy.image.transform Module¶

Functions for geometrical image transformation and warping.

Functions¶

affine_transform(image, rmatrix[, order, …])

Rotates, shifts and scales an image.

sunpy.image.coalignment Module¶

This module provides routines for the coalignment of images and mapsequences.

Currently this module provides image coalignment by template matching. Which is partially inspired by the SSWIDL routine tr_get_disp.pro.

In this implementation, the template matching is handled via the scikit-image routine skimage.feature.match_template.

References

http://scribblethink.org/Work/nvisionInterface/nip.html
J.P. Lewis, Fast Template Matching, Vision Interface 95, Canadian Image
Processing and Pattern Recognition Society, Quebec City, Canada, May 15-19, 1995, p. 120-123 http://www.scribblethink.org/Work/nvisionInterface/vi95_lewis.pdf.

Functions¶

`calculate_shift`(this_layer, template)	Calculates the pixel shift required to put the template in the “best” position on a layer.
`clip_edges`(data, yclips, xclips)	Clips off the “y” and “x” edges of a 2D array according to a list of pixel values.
`calculate_clipping`(y, x)	Return the upper and lower clipping values for the “y” and “x” directions.
`match_template_to_layer`(layer, template)	Calculate the correlation array that describes how well the template matches the layer.
`find_best_match_location`(corr)	Calculate an estimate of the location of the peak of the correlation result in image pixels.
`get_correlation_shifts`(array)	Estimate the location of the maximum of a fit to the input array.
`parabolic_turning_point`(y)	Find the location of the turning point for a parabola `y(x) = ax^2 + bx + c`, given input values `y(-1), y(0), y(1)`.
`check_for_nonfinite_entries`(layer_image, …)	Issue a warning if there is any nonfinite entry in the layer or template images.
`apply_shifts`(mc, yshift, xshift[, clip])	Apply a set of pixel shifts to a `MapSequence`, and return a new `MapSequence`.
`mapsequence_coalign_by_match_template`(mc[, …])	Co-register the layers in a `MapSequence` according to a template taken from that `MapSequence`.
`calculate_match_template_shift`(mc[, …])	Calculate the arcsecond shifts necessary to co-register the layers in a `MapSequence` according to a template taken from that `MapSequence`.