Detecting and Calculating the droplet diameter in an image with Low contrast

Hi

Is there a way to detect the droplets in the attached image and draw a boundary around them with an acceptable accuracy?

My final purpose is to find the diameter of each droplet so that I can calculate the distributions of droplet size.

I have tried to use watershed cutting and imfindcircle, but the effect is not ideal.

Thank you for your help.

[KALYAN ACHARJYA]

You can try with other color models. I got this by simply thresholding in the hsv color space.

[Yabin Niu]

Thank you, Sir. I have got a good binary graph through image preprocessing. However, how to realize the perfect circle recognition and diameter statistics on the basis of binary graphics? I have tried to use watershed cutting and imfindcircle, but the current results are not ideal.

Answer 1

[Swetha Polemoni]

Hi

It is my ynderstanding that you want to find the diameter of the circles/droplets in the image. You can do it using regionprops .

Here is an example for understanding the estimation of radii and centroid of circular object in an image.