Copyright © Fred Weinhaus My scripts are available free of charge for non-commercial (non-profit) use, ONLY. For use of my scripts in commercial (for-profit) environments or non-free applications, please contact me (Fred Weinhaus) for licensing arrangements. My email address is fmw at alink dot net. If you: 1) redistribute, 2) incorporate any of these scripts into other free applications or 3) reprogram them in another scripting language, then you must contact me for permission, especially if the result might be used in a commercial or for-profit environment. Usage, whether stated or not in the script, is restricted to the above licensing arrangements. It is also subject, in a subordinate manner, to the ImageMagick license, which can be found at: http://www.imagemagick.org/script/license.php Please read the Pointers For Use on my home page to properly install and customize my scripts. |
Automatically thresholds an image to binary (b/w) format at a specified percentile on the cumulative histogram. |
last modified: December 15, 2018
USAGE: ptilethresh [-p percentile ] infile outfile
-p .... percentile .... percentile on cumulative histogram for PURPOSE: To automatically thresholds an image to binary (b/w) format at a specified percentile on the cumulative histogram. DESCRIPTION: PTILETHRESH automatically thresholds an image to binary (b/w) format at a specified percentile on the cumulative histogram. When the percentile is 50%, this technique is also known as balanced thresholding. ARGUMENTS: -p percentile ... PERCENTILE is the desired threshold point on the cumulative histogram. Values are floats between 0 and 100. The default=50. NOTE: It is highly recommended that the output not be specified as a JPG image as that will cause compression and potentially a non-binary (i.e. a graylevel) result. GIF is the recommended output format.
REFERENCES: CAVEAT: No guarantee that this script will work on all platforms, nor that trapping of inconsistent parameters is complete and foolproof. Use At Your Own Risk. |
PTILE Thresholding Of Various Images |
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Pictures Were Obtained from: |
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Original Image |
Thresholded Image |
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See A Comparison Of Each Image Against Each Thresholding Technique
What the script does is as follows:
This is equivalent to the following IM commands
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