How can I remove inside area from an ROI to analyse the outer area only?

2 次查看（过去 30 天）
molly jane fitches
评论： molly jane fitches 2017-8-8
I have recently started using MATLAB for image processing with MR images, and so far have found previously asked questions and examples to be a great help - but with this I am a little stuck! I have created an ROI on my dicom image using imfreehand() I have then dilated this ROI using the imdilate(I, strel('square',n)) function to create a new ROI. Ideally, I would now like to subtract the original ROI from the new ROI so that I am left with only the new area. Any help would be greatly appreciated!

请先登录，再回答此问题。

采纳的回答

KSSV
KSSV 2017-8-7
I = imread('cameraman.tif') ;
imshow(I)
h = imfreehand ;
pos = wait(h);
%%Extract the ROI
[ny,nx] = size(I) ;
[X,Y] = meshgrid(1:nx,1:ny) ;
idx = inpolygon(X(:),Y(:),pos(:,1),pos(:,2)) ;
Z = I ;
Z(idx) = NaN ;
imshow(Z) ;
  4 个评论
显示 2更早的评论
molly jane fitches
molly jane fitches 2017-8-8
I thought so, thought it would be very easy to adjust but rather than returning an error it executes and displays the original image. I drew the ROI using imfreehand, then tried it as a double, and then tried using the column and row vectors from the boundary.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 DICOM Format 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by