BARBARA - Load the 'barbara' test signal

Description

barbara loads the 'barbara' signal. Barbara is an image commonly used in image compression and filtering papers because it contains a range of tones and many thin line patterns. The resolution is (512 x 512).

This signal, and other standard image tests signals, can be found on Morgan McGuire's Computer Graphics Archive`<http://graphics.cs.williams.edu/data/images.xml>`_.

For convenience the output image is normalized by 255 and converted to double.

Example

Load the image and display it:

im = barbara();
imagescgray(im);