FBHIST

Section: User Commands (1)
Updated: 25-Jun-90
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NAME

fbhist - compute histogram of an image

SYNOPSIS

fbhist [ -h ] < image

DESCRIPTION

Prints some of the header info and displays the maximum, minimum, mean, and standard deviation of the gray levels. If given any argument it also dumps the histogram. Works correctly for black and white images. On color images it will work, but the results for images with odd widths will include the zeroes used to pad to an even byte boundary.

-h: histogram argument requests printing the actual counts for all gray levels used by the image.

EXAMPLE

To compute the mean and range of an image:

    % fbhist < tiger.fbm
    Tiger [400x640  8 bits  0.833 aspect ratio]
    Mean 88.83 +- 40.94, range 21..201

The output shows that the image is title 'Tiger', and that it is 400 pixels wide and 640 pixels tall. The pixels are 8 bits deep, and the image has a 0.833 aspect ratio (it is a rotated version of a 1.2 to 1 image). The average density is 88.83 with a standard deviation of 40.94. Pixels range from values 21 (darkest) to 201 (lightest) out of a 0..255 range.

BUGS

None known.

HISTORY

Copyright (C) 1989,1990 by Michael Mauldin. Permission is granted to use this file in whole or in part for any purpose, educational, recreational or commercial, provided that this copyright notice is retained unchanged. This software is available to all free of charge by anonymous FTP and in the UUNET archives.

25-Jun-90 Michael Mauldin at Carnegie Mellon University: Release 1.0 mlm@cs.cmu.edu
07-Mar-89 Michael L. Mauldin at Carnegie Mellon University: Beta release (version 0.9) mlm@cs.cmu.edu

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