How to take circular ROI

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Parag
Parag 2016-11-11
回答： Tim Jackman 2018-9-21
Hi, I am trying to get a circular ROI within the image. For rectangular ROI we can use imrect and get the position/coordinate, so is there a similar function to take circular ROI ?. I tried with imellipse but the coordinate that the function return I am not able to crop using imcrop. I am attaching an image here with desire ROI please let me know your suggestions. Thank you,

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回答（2 个）

Image Analyst
Image Analyst 2016-11-11
编辑：Image Analyst 2016-11-11
Simply threshold
Mask = grayImage > someThresholdValue;
Tim Jackman
Tim Jackman 2018-9-21
Starting in 18b, you can use drawcircle to create a circular ROI:
https://www.mathworks.com/help/images/ref/drawcircle.html
For more information about the new suite of ROI tools, please take a look at the following link:
https://www.mathworks.com/help/images/roi-based-processing.html

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