# to draw perfect circle object mask in PIVlab

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준수 il 7 Feb 2024
Commentato: 준수 il 8 Feb 2024
I want to draw a perfect circle ( like using functions or code) when creating an object mask in PIVlab. I am interested in observing droplet flow on a flat surface
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Vaibhav il 8 Feb 2024
Modificato: Vaibhav il 8 Feb 2024
You can draw a perfect circle by creating a binary mask where the circle is represented by ones and the rest of the matrix is zeros. This binary mask can be used in PIVlab or other image processing applications to observe specific regions, such as a droplet flow on a flat surface.
To create a circle mask, you can use the following code snippet:
% Define the dimensions of the image (mask)
imageWidth = 512; % Width of the image in pixels
imageHeight = 512; % Height of the image in pixels
% Define the properties of the circle
centerX = imageWidth / 2; % X coordinate of the circle's center
centerY = imageHeight / 2; % Y coordinate of the circle's center
% Create a grid of coordinates corresponding to the image dimensions
[xGrid, yGrid] = meshgrid(1:imageWidth, 1:imageHeight);
% Calculate the binary mask where the circle pixels are 1 and others are 0
% Display the binary mask as an image
% If you need to save the mask to a file, you can use the following code:
You can also use "viscircles" function to create circles with specified centers and radii. Refer to the below official MathWorks documentation to know more about "viscircles" function:
Hope this helps!
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준수 il 8 Feb 2024
Thank you so much, I solved the problem. I was able to use the code you told me to convert each cell of the data sheet of 1 person, which is the mask part 0, to white and black, and load it with PIVLAB to use it as a mask. Thank you and have a nice day.
준수 il 8 Feb 2024
^__^

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