Any way to free hand crop an image?

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Siddharth
Siddharth il 19 Giu 2013
Commentato: ali seraj il 11 Ago 2020
Is there any way to free hand crop on an image? I have an organic shape I want to quickly crop not using the rectangular box that matlab has for cropping. Any way to go about this?

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Sean de Wolski
Sean de Wolski il 19 Giu 2013
How do you propose cropping a non-rectangular shape? Do you want to zero out parts that aren't within in your "cropped" region. An image always has to be rectangular.
doc imcrop
doc impoly
doc imfreehand
If you want to zero out the parts not in the free hand reason. use the createMask method of the freehand region to build a mask of the free hand region. Then negate it and zero everything in it out.
I = imread('cameraman.tif');
imshow(I);
h = imfreehand; %draw something
M = ~h.createMask();
I(M) = 0;
imshow(I);
  8 Commenti
Warid Islam
Warid Islam il 23 Lug 2019
Hi,
I found tha MATLAB does not recommend getPosition method. They recommend to use ROI classes. I tried using the ROI.FREEHAND class but I get the following error:
Unrecognized method, property, or field 'roi' for class 'images.roi.Freehand'.
Error in fh4 (line 6)
pos = images.roi.Freehand(); % get position for that ROI
ali seraj
ali seraj il 11 Ago 2020
thank you

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