How to choose the right image filtering technique for my application

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user 2018-3-19

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评论： user 2018-3-26

I am observing two droplets, one with a air bubble and one without an air bubble. The droplets are frozen and I watch the freezing process and track through time. Currently I send my black and white video (a snippet of it is attached as image.png) through an edge-detection filter in Matlab this filter is as follows:

B = edge(Frames,'canny',0.1);

The only problem with this "canny" method of filtering is that they leave too much noise inside the droplets, especially in the one with an air bubble. When I analyze with these filters, the noise interferes with my analysis of the freezing line and skews my data. As you can see in the "withotu bubble.PNG" file there is some noise around the freezing line and this noise is much worse in the "withairbubble.PNG" file that is attached. I want to know if there is a way for me to either remove or avoid all that noise surrounding the lines and only filter in the freezing line as it goes up.

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Image Analyst 2018-3-19

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Then don't use edge detection. I see no reason why you'd want to use edge detection. And why can't you just throw out any droplets that have a bubble in them? Why even bother with them? Can't you just take another video, or not start recording if you see a bubble? Just record enough videos so that you have enough good videos even when you throw out the bad ones with air bubbles.

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user 2018-3-20

编辑：Image Analyst 2018-3-20

The Ideal image.jpeg is my "ideal" scenario. And the Raw image.png is the image I start with (it's a video so there will be thousands of frames but I can't upload all of that).

The "ideal" sketch shows what I want. The droplet on the left is without air and the one on the right is with air. The numbers next to the droplets represent an arbitrary time as time increases the freezing line goes up. The asterisk represents some sort of digital noise that will occur, most likely due to the air bubble in the droplet. I want to minimize this noise as much as possible.

Basically all I want is the outline of the droplet and freezing line as it moves up. I have been able to do this with droplets without air bubbles but it proves to be very difficult (maybe even impossible) with droplets with air bubbles in side. It is ok if my end product has the air bubble, as long as the freezing line is easily visible and distinguishable, I am fine. After all, that is all that I care about.

Image Analyst 2018-3-26

Your video just has one droplet in each frame, right? Not two like you had above. I assume you just stitched two different frames side-by-side.

user 2018-3-26

No, my video has two droplets side by side, one with air bubble and one without; but that shouldn’t cause too many problems because I end up cropping the video into half and then analyzing each droplet individually.

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