gray image to binary image

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please i need the best java code to convert gray image to binary image

i tried alot of examples but it is not accurate like for example the output of paint when save the photo as mono bitmap

Posted 28-Apr-13 3:27am

amir tarek

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Sergey Alexandrovich Kryukov 28-Apr-13 13:01pm

This combination of words makes no sense. All images are "binary".
—SA

Zoltán Zörgő 28-Apr-13 16:38pm

But it does! 1 bit color depth images are called binary - "mono" makes less sense here.

Sergey Alexandrovich Kryukov 28-Apr-13 19:49pm

Yes, I already found some documentation using this kind of jargon, thank you.
—SA

Zoltán Zörgő 29-Apr-13 0:24am

I have left out a link. Please see updated answer.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-04-28T07:06:00

I think you need to convert the image to black and white by some threshold or similar criterion.

If you think at it just a bit, you will understand that this kind if filter cannot be more or less "accurate". It converts one image to another one according some threshold value, but this is you who can decide what threshold to choose.

[EDIT #1]

More exactly, the word "inaccurate" it totally inapplicable here. If you knew the final "perfect" result of some image transformation, you could compare it with the results you got, but there is no a "perfect" unambiguous transformation. By making a black-and-white image, you always lose some information. What exactly to lose, is a philosophical question. It depends on the input image and some criteria which can be quite hard to formulate.

[END EDIT #1]

[EDIT #2]

You can use, for example, AForge.Imaging.Filters.Threshold:
http://www.aforgenet.com/framework/docs/html/503a43b9-d98b-a19f-b74e-44767916ad65.htm[^].

This is from the well-known open-source library for .NET called AForge.NET:
http://en.wikipedia.org/wiki/Aforge.net[^],
http://www.aforgenet.com/[^].

For the threshold filter, please see org.jscience.computing.ai.vision.Filter:
http://jscience.org/experimental/javadoc/org/jscience/computing/ai/vision/ThresholdFilter.html[^].

You can find it in the JScience library: http://jscience.org/[^].

[END EDIT #2]

—SA

**Zoltán Zörgő** · Accepted Answer · 2013-04-28T10:36:00

As you asked for java solution, I can recommend OpenCV[^]. And here you have a good tutorial about converting an image to binary (black and white) using thresholding, with some theory too: http://docs.opencv.org/doc/tutorials/imgproc/threshold/threshold.html[^]. You will notice, that there is no best method, you will have to choose the most suitable for you. Note, that the samples there are not in Java, but it will be easy to do the same in java since both use OpenCV.

Binarization is in general a special type of image segmentation[^], and there are other, more complex aspects of that than thresholding. Please note also, that binarization can be a morphological operation too, like skeleton extraction.

If you don't want OpenCV, look here: http://zerocool.is-a-geek.net/?p=376[^]

[update: important link was missing]

gray image to binary image

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