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select roi on the circle

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Latifa Bouguessaa
Latifa Bouguessaa am 21 Jun. 2022
Kommentiert: Image Analyst am 23 Jun. 2022
Good day,
I hope someone can help me here.
I have a phantom CT image and want to select the objects (Roi). The objects are on a circle. Is there a way to convert this ROI to Cartesian coordinates. many thanks and best regards
  1 Kommentar
Sulaymon Eshkabilov
Sulaymon Eshkabilov am 21 Jun. 2022
Here are a couple of good examples how to work with ROI:Eg1., Eg2.

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Antworten (2)

Image Analyst
Image Analyst am 21 Jun. 2022
Looks like you could simply create a mask using the code in the FAQ:

Latifa Bouguessaa
Latifa Bouguessaa am 22 Jun. 2022
Hello,
Thank you Sulaymon Eshkabilov and Image Analyst for your answer.
I have now segmented my phantom on the picture and determined the center of the phantom. but I couldn't cut the desired area (roi) on the picture.
I need to select an arc with Radius1=45 and Radius2=55 on the image. The center of the phantom has the coordinates X= 259 and y=252.
can someone help me??
Best regards
  1 Kommentar
Image Analyst
Image Analyst am 23 Jun. 2022
Why do you need to cut it out (crop it)? That's probably not necessary. If you do you can do this
props = regionprops(mask, 'BoundingBox');
croppedImage = imcrop(grayImage, props.BoundingBox);

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