Name

rtshg - rotate and shift a 2D image using the gridding method

Usage

• output = rtshg (image, alpha, sx, sy, scale)

Input

image

a 2D input image

alpha

rotation angle

sx

x shift (default = 0.0)

sy

y shift (default = 0.0)

scale

magnification change (default = 1.0)

Output

output

the output rotated and shifted image

Method

• The rotation is performed first, second the shift (in one interpolation step). The scale will change the 'physical pixel size' of the image (scale >1 will reduce the pixel size, scale<1 will increase it). Note rescaling will not change the image size in pixels; to do that, use command resample.

  • Operation
• output = rtshg (input, alpha, sx, sy)
• corresponds to:
• temp = rtshg (input, alpha)
• output = rtshg (temp, 0, sx, sy)

Author/Maintainer

Pawel A. Penczek

Keywords

category 1

FUNDAMENTALS

category 2

SPATIAL

Files

• fundamentals.py

See also

• rot_shift, rotshift2dg, resample

Maturity

• Perfect

Bugs

• perfect