How to detect bubbles from a flow of water from picture below?

Question

Coral Kennerley 2019-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/443887-how-to-detect-bubbles-from-a-flow-of-water-from-picture-below

评论： Image Analyst 2019-6-7

Hi,

I need to write a code that will detect the bubbles in the picture below in order to calculate the air to water ratio.

I have attached examples with white and black backgrounds - im not sure which would be easier to process

I want to be able to detect the bubbles, then calculate the radius, then eventually volume of each bubble.

I have tried the Sobel edge detection to detect bubbles, when i did it with a picture of circles it worked fine, but now im using the image of the bubbles it isnt detecting the bubbles correctly.

I have also tried, Canny and Prewitt.

image=imread('bubblesblack.png');

I=rgb2gray(image);

BW=imbinarize(I, 1);

BW1=edge(I, 'Sobel');

imshow (BW1)

It is showing this:

Any help would be appreciated! Screenshot 2019-02-08 at 11.03.29.png

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Answer 1

Pedro Silva Aires 2019-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/443887-how-to-detect-bubbles-from-a-flow-of-water-from-picture-below#answer_378194

Hello Coral, any luck with the issue?

I'm performing similar experiment and having the same problem with my images.

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Image Analyst 2019-6-7

She needs to work on improving her image capture situation first, like using more appropriate lighting and surrounding background. For example, many/most of the reflections could be removed using crossed polarizers. The image analysis could be made a lot easier if care was taken to improve the images.

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