Calculate the cone angle of a spray image
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Please find the image bellow - the angle is between the boundary lines in red shown, while the reference point is the center point in the line shown as reference. The reference point is at fixed distance known value. The dark fish shaped is the spray shape after impingement- for which we need to measure the angle. Scattered dots are particle in liquid form-
To tackle I thought to get following steps: read the image Subtracting image with background image to get clear spray visualization convert grey-scale to binary setting threshold for separating the dark and light area- for boundary Drawing the boundary lines as spray after collision and calculating the angle between lines
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/150066/image.png)
3 Comments
Image Analyst
on 13 May 2015
Attach the original, un-annotated image and your script if you need help on it.
Accepted Answer
Image Analyst
on 14 May 2015
Edited: Image Analyst
on 16 Jul 2021
Alright sanjeet, I spent way more time than I should have to make this fancy for you (about half an hour) but attached below the image is the code.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/176820/image.jpeg)
It determined that the angle is 23.1 degrees. If you want the lines overlaid on the image, I'm sure you can figure out that simple part. As I mentioned in the comments you might want to figure out an algorithm to examine the widths plot and figure out where to fit your line over. The min is fairly straight forward, but the widest part is somewhat of a judgement call.
More Answers (2)
Dhruv Gandhi
on 29 Apr 2019
Hallo image analyst,
i want to calculate the area of the coloured image , see the attachment.
i try to convert all the blue lines into white and other then Blue in to Black. after That want to calculateArea of this Black region in the image. i Dont know How to do that. can ypu please Help.
0 Comments
I Komang Gede Tryas Agameru Putra
on 28 Jul 2023
Dear Image Analyst,
Thank you for providing the code above, I tried to use your code to analyze the cone angle, but it turns out that the cone angle is not properly calculated since it shows zero values (please kindly see the attachment).
Please kindly help me to solve this issues.
Thank you in advanced.
5 Comments
I Komang Gede Tryas Agameru Putra
on 2 Aug 2023
Dear Image Analyst,
I have posted the question in separate section. Thank you in advanced
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