coyote: HISTOMATCH

• coyote/Image Processing
• [Source code]

NAME

HistoMatch

PURPOSE

This is a function for Histogram Matching, in which an image
is manipulated in such a way that it's final histogram approximates
the histogram of an input image or histogram. Histogram matching
allows the user to specify the shape of the histogram of the final
product.

AUTHOR

FANNING SOFTWARE CONSULTING
David Fanning, Ph.D.
1645 Sheely Drive
Fort Collins, CO 80526 USA
Phone: 970-221-0438
E-mail: david@idlcoyote.com
Coyote's Guide to IDL Programming: http://www.idlcoyote.com

CATEGORY

Image Processing

CALLING SEQUENCE

output_image = HistoMatch(image, histogram_to_match)

INPUTS

image - The input image to be manipulated. Assumed to be a 2D byte array.
histogram_to_match - Can be either a 1D long vector of 256 elements specifying
    the histogram to match, or a 2D byte array from which the histogram to
    match is calculated.

OUTPUTS

output_image - The manipulated image adjusted to the histogram specifications.

INPUT KEYWORDS

None.

OUTPUT KEYWORDS

None.

DEPENDENCIES

None.

METHOD

Based on the Histogram Matching method on pages 94-102 of Digital
Image Processing, 2nd Edition, Rafael C. Gonzalez and Richard E. Woods,
ISBN 0-20-118075-8.

EXAMPLE

There is an example program at the end of this file. It will require cgImage
from the Coyote Library to run. You can also find an explanation of this program
at http://www.idlcoyote.com/ip_tips/histomatch.html.

MODIFICATION HISTORY

Written by David W. Fanning, January 2003.