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.

Thank you

How to calculate selection parameters

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