How to Crop A bunch of image with same box but different position

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Hi ,
I'm trying to cropping polygons out of a bunch of images where the polygon's dimention and shape is always the same but I can choose the position changing the center or a vertex. I already made a code that allow me to do this with a rectangle but i want to change the shape. Anyone can help me please?
figure
imshow(read(DatabaseTest , i))
hold on
[x0,y0] = ginput(1);
J = imadjust(rgb2gray(read(DatabaseTest , i)));
ImageTest = imcrop(J,[x0 - width / 2,y0 - height / 2,width,height]);
this is a part of a code able to extract HOG Features so I change rgb2gray to reduce noise effects (if you want you can also suggest me any tips).

Respuesta aceptada

Ani Singh
Ani Singh el 26 de Mzo. de 2020
You can do this by using roipoly function.
I am attaching sample script for it :
% read the image
input = imread (I)
%Co-ordinates of selected area(change thee according to your requirements)
r=[40 204 267 102];
c=[136 125 210 219];
BW=roipoly(input,r,c);
%replacing white area with the desired image
out=zeros(size(BW,1),size(BW,2));
out = gray .* uint8(BW); %store those pixels in output which are selected, can be done by 2 for loops also
imshow(out)
  1 comentario
Martino Corno
Martino Corno el 28 de Mzo. de 2020
Thanks very much,
I understood what this code want to performe but 'BW' and 'gray' are not the same class of integer . I copied and pasted your code, but the matrix moltiplication doesn't seems to work for my case, I also change with function uint8 the class of matrix 'gray' but it doesn't work as well . Do you have any suggestion?

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