unrotate90

sofia_redux.toolkit.image.adjust.unrotate90(image, direction)

Un-rotates an image using IDL style rotation types

The table below lists the different IDL rotation directions (The rotation applied to the image that you now wish to remove). (X0, Y0) indicates the original subscripts, and (X1, Y1) are the subscripts of the resulting array. The notation Y0 indicates a reversal of the Y axis, Y1 = Ny - Y0 - 1.

Direction	Transpose?	AntiClockwise	X1	Y1
0	N	0	X0	Y0
1	N	90	-Y0	X0
2	N	180	-X0	-Y0
3	N	270	Y0	-X0
4	Y	0	Y0	X0
5	Y	90	-X0	Y0
6	Y	180	-Y0	-X0
7	Y	270	X0	-Y0

This function applies the opposite rotation to the input image.

Parameters:

imagearray_like of float

(nrow, ncol) array to rotate.

directionint

The IDL rotation type to “unrotate” the image by.

Returns:

numpy.ndarray

(nrow, ncol) or (ncol, nrow) depending on rotation type.