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I have a suggestion.

1. Isolate the large blob. Connected components should work, but there are other ways.
2. Find the left-most pixel in every row (use the bounding box to make the search faster).
3. Push the x position of the left pixels into an std::vector and use std::nth_median to find the median value.
4. That's your line edge. Then the very left-most pixel is the top of the droplet, and you have the height of the droplet in pixels.

I have a suggestion.

1. Isolate the large blob. Connected components should work, but there are other ways.
2. Find the left-most pixel in every row (use the bounding box to make the search faster).
3. Push the x position of the left pixels into an std::vector and use std::nth_median to find the median value.
4. That's your line edge. Then the very left-most pixel is the top of the droplet, and you have the height of the droplet in pixels.