Contrast Measuring in C#

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Greetings,

I am new to C-sharp and I am trying to implement an auto focus setup on a digital microscope. I plan to have the camera on a small axis and have the camera take a couple of pictures at different distances. I would like the program to pick to picture that has the highest contrast(the least blurred picture). While researching this topic I found out there are several ways of doing this such as the FFT, phase measurement, and contrast measurement. I would like to use the contrast measurement method and just pick the picture with the highest contrast but I could not find any information on implementing that in Visual C#. Does anyone have any ideas as to how I could resolve this issue?

Thank you,
John K

Posted 17-May-13 5:45am

Member 9927463

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Richard C Bishop 17-May-13 11:47am

You will need to consult the documentation provided by the manufacturer of the device you are using.

Sergey Alexandrovich Kryukov 17-May-13 13:55pm

This is not really related to the device; it should be done when the image is already delivered. Please see my answer.
—SA

Richard C Bishop 17-May-13 13:59pm

Indeed. After re-reading it, it is device independent. Thank you for the clarification.

Sergey Alexandrovich Kryukov 17-May-13 14:05pm

Sure. Note that OP was able to solve the problem, accepted my solution.
The problem is really interesting, come to think about; please see some more comments below.
—SA

Richard C Bishop 17-May-13 14:33pm

Nice work! As usual.

Sergey Alexandrovich Kryukov 17-May-13 14:46pm

Thank you very much. :-)
—SA

Member 9927463 17-May-13 12:17pm

The device we are using does not have the autofocus capability. We are trying to manually add it

Sergey Alexandrovich Kryukov 17-May-13 13:56pm

Great idea. You should have told it from the very beginning. It makes the question interesting. I'll vote 5 for it.
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-17T06:17:00

First of all, forget the PictureBox. It is totally irrelevant to image, and especially to its measurement. As this is a usual mistake, please see my past answers:
How do I clear a panel from old drawing[^],
draw a rectangle in C#[^],
Append a picture within picturebox[^].

The image is the bitmap, not the control.

To get all information from an image you need to use System.Drawing.Bitmap.LockBits:
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.lockbits.aspx[^].

Better yet, I would recommend well-known open-source AForge.Net library:
http://en.wikipedia.org/wiki/AForge.NET[^],
http://www.aforgenet.com/[^].

See also the CodeProject articles by Andrew Kirillov, the author of AForge.Net: http://www.codeproject.com/Articles/Andrew-Kirillov#articles[^].

—SA