How to track the boundary of a drop over successive frames?

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Rajesh
Rajesh 2017-5-2
评论： Image Analyst 2017-5-2
Hi,
I am trying to track the boundary of drop that is spreading over a liquid. The drop is circular initially but get deformed over subsequent frames. A few frames from the video are attached in this Hyperlink. I tried using regionpros and hough transform in Matlab but neither of them worked. The major problem is due to the background which is a grid placed in order to enhance the contrast of the edge (without it the edge is not very clear) while recording the video. How can I measure the area/ perimeter of the region enclosed by the interface?
Any help on how to proceed would be really appreciated.
Thanks,
Rajesh

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回答（1 个）

Image Analyst
Image Analyst 2017-5-2
Try thresholding and calling bwboundaries. If that doesn't work because the boundary is too faint, then try to seal it by using imdilate() before thresholding:
img = imdilate(grayImage, true(3));
binaryImage = img > 128; % Or whatever value works.
binaryImage = imfill(binaryImage, 'holes'); % Fill it so we can get the outer boundary only.
boundaries = bwboundaries(binaryImage);
  2 个评论
Rajesh
Rajesh 2017-5-2
编辑：Rajesh 2017-5-2
Dilating the image make the interface less prominent even for a low value of the structuring element. So the subsequent operations become more difficult. Is there an alternate way I could perform dilation to join the pixels in the band of white pixels at the interface?
I = imread('frame (1).jpg');
figure(1), imshow(I);
J=im2double(I);
figure(2), imshow(J);
se = strel('disk',1);
K = imdilate(J,se);
figure(3), imshow(K);
Image Analyst
Image Analyst 2017-5-2
It should make the white ring larger. I don't know why it didn't.
You could try just thresholding the noisy image and then calling bwareafilt() or bwareafilt() to take only blobs of a certain size. Then call bwconvhull() to create the ellipses.

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