Detecting Water Droplets

2011 7 14
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I need to detect water droplets on different surfaces. I have a picture of the original surface, but the lighting is slightly flickery so the shadows change slightly. I have tried many variations of tracing edges and circle detection. I have also increased the image contrast and equalized the brightness of the image by using histeq() in various combinations before using any of the previously mentioned methods.
Here is an example of my images. The first picture is before any condensation, and the second has the droplets I want to analize/isolate. http://imageshack.us/g/685/a00120110714092419.png/

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Image Analyst
Image Analyst 2011-7-15

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Maybe try this: http://blogs.mathworks.com/pick/2008/05/23/detecting-circles-in-an-image/
If you can change the water to quinine water you can use UV fluorescence photography, because the water will glow. Just another example of how improving or changing the image capture situation will give you an image that is easier to measure.

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Julie
Julie 2011-7-15
I can't add anything to the water, I am looking at condensation from the humidity in the air. Also as for improving the image capture sitation I have tried everyhing I can think of, including diffusing my light source so the flickering is dimished and the pictures posted are the result.
Also, I have already tried the program the tutorial sugests as well as many of the other teqniques sugeated, I can't seem to get it to pick up the droplets correcttly. But thank you for the sugestions.
Doug Eastman
Doug Eastman 2011-7-15
How flat is the surface? Perhaps you could scan a laser just about the surface to highlight the drops better?
Julie
Julie 2011-7-18
No, It it in a really small chamber, and I need to take the data over time. Also, I don't have that much freedom over the setup.

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Sean de Wolski
Sean de Wolski 2011-7-14

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perhaps an
imdivide %?

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Julie
Julie 2011-7-14
Would that work if the shadows were diffrent lengths/sizes? Because I tried imsubtract as well as imabsdiff and neither of those worked.
Sean de Wolski
Sean de Wolski 2011-7-14
A division is probably better for illumination issues.
Julie
Julie 2011-7-15
I tried using imdivide(), but all I get is a completely black screen. Am I doing something wrong?

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Julie
Julie
2011-7-14

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