One need to automatically find the coordinates of top left corner and width & height of subimage to be cropped. Once determined, you can run the following example code from MATLAB imcrop documentation to automatically crop subimages from any image
I = imread('circuit.tif');
% I2 = imcrop(I, rect) crops the image I. rect is a
% four-element position vector
%[xmin ymin width height] that specifies the
% size and position of the crop rectangle.
I2 = imcrop(I,[75 68 130 112]);
imshow(I), figure, imshow(I2)
One need to automatically find the coordinates of top left corner and width & height of subimage to be cropped. Once determined, you can run the following example code from MATLAB imcrop documentation to automatically crop subimages from any image
I = imread('circuit.tif');
% I2 = imcrop(I, rect) crops the image I. rect is a
% four-element position vector
%[xmin ymin width height] that specifies the
% size and position of the crop rectangle.
I2 = imcrop(I,[75 68 130 112]);
imshow(I), figure, imshow(I2)
Yes, you can, based on the image you need to select automatically the parameters of MATLAB function "imcrop". The selection of parameters depends on the application for which you need to crop the image.
It is easy to crop images in matlab.
a=imread(filename.jpg);
gr=rgb2gray(a);
bw=im2bw(gr);
edge=edge(bw,'canny',[0.15, 0.3])
crp=imcrop(edge)
you can use the imcrop function too. That will take the image and exclude the image other than the specified dimensions of image.
If you prefer, can do it:
%% read the image
IMG = '1_6.jpg';
IMG = imread(IMG);
IMG = rgb2gray(IMG);
IMG = double(IMG);
%crop 3 pixels off each side
IMG = IMG(4:end - 3, 4: end - 3);
originalImage = uint8(IMG);
Hi,
This great way to crop part from image.
I have hundreds of colour images with extra information , I want to cut just the face from this images without extra information in the same size to use them to extract features from images. Could you please any one help me to how I can calculate selection parameters .
Please anybody explain the imcrop(I,[xmin ymin width height]) with an example. I have attached my problem herewith. Please give me some suggestions. Thanks for all.
Hi Depankar,
How did you go with cropping your images, do you still need help?
Cheers
Peyman
The material in the following link regarding cropping a binary image will help you to understand this concept.
for more details, visit the link:
http://naveenideas.blogspot.com/2016/02/matlab-cropping-binary-image-algorithm.html
function Croping(PATH,CLASE_IN,CLASE_OUT)
PATH_CLASE_IN = [PATH CLASE_IN];
PATH_CLASE_OUT = [PATH CLASE_OUT];
TYPE = '*.*';
LIST_DIR = dir(fullfile(PATH_CLASE_IN,TYPE));
for i=1:length(LIST_DIR)
if (LIST_DIR(i).isdir==0) %not directory
imagen = LIST_DIR(i).name;
I = imread([PATH_CLASE_IN imagen]);
I2 = imresize(I,0.5);
imshow(I2);
rec=imcrop(I2);
imshow(rec);
imwrite(rec,[PATH_CLASE_OUT imagen]);
end
end
end
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