Image processing on irregular shaped water droplets

Currently, I am working on a project about condensation of droplets on flat surfaces. What I need to do is detecting all the droplets occurring on surfaces in series of pictures using MATLAB. For example, one of the pictures will look like this:

I was able to detect all the small droplets (which are more likely to be complete circles) using imfindcircles . However, the problem is detecting irregular shaped droplets (like 3 biggest circles in the picture). I am planning to used regionprops on these droplets; however, I was not able to clearly extract the binary image on this picture.

The code that I am using to process image is:

I=imread('test003.jpg');
im = mean(I,3);
im = (im-min(im(:))) / (max(im(:))-min(im(:)));

bw=im2bw(im,0.28);
imshow(bw)
[~, threshold] = edge(im,'canny');
fudgefactor = .92;
bws = edge(im, 'canny', threshold * fudgefactor);
figure, imshow(bws)
se90 = strel('line', 3, 80);
se0 = strel('line', 3, 0);
BWsdil = imdilate(bws, [se90 se0]);
figure, imshow(BWsdil)
BWdfill = imfill(BWsdil, 'holes');
figure, imshow(BWdfill);

so far I was able to get these images:

So droplets I have a problem with are 1, 2 and 3. I am planning to combine the regionprops and imfindcircles once I am able to extract the regions of irregular shaped droplets. Could you please suggest to me what I can do to improve this image processing?

Thank you!

[Ashish Uthama]

Do you have control on how the images are captured? (I am thinking if alternate means of lighting the surface would yield better results)