Automatically crop the edge detected area of an image

after detect the edge by canny edge edge detector how can i crop the edge detected area of the image?

[SHOBA MOHAN]

Hi, Please refer this link, it will be helpful for you. https://www.mathworks.com/matlabcentral/answers/337751-crop-the-irrelevant-part-of-the-image?s_tid=answers_rc1-2_p2_MLT

Answer 1

[Image Analyst]

Try imcrop(). I can't say more than that because you forgot to attach your image.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[Kogila wanee]

This is my image , after detecting the boundary of the image i need to automatically crop the detected area of the image

[Image Analyst]

You'd do yourself a favor by improving your image capture parameters. For example, put the bill on black velvet or some other kind of uniform, matte background, or at least use a polarizer over the lens of your camera.

Anyway, imcrop() will work. Did you even try it? If not, why not?

[Kogila wanee]

Yes sir , I tried , But i can only manually crop the image, for automatically crop the edge detected area what i need to do??

This is my code:

a=imread('img(14).jpg');

figure,imshow(a); title('Original image');

% Convert to gray scale

if size(a,3)==3

gr=rgb2gray(a);

end

figure,imshow(gr); title('Gray image');

bw=imbinarize(gr);

figure,imshow(bw); title('Binary image');

edge=edge(bw,'canny');

figure,imshow(edge); title('edge detected image');

crp=imcrop(edge);

figure,imshow(crp); title('Cropped image');

[Image Analyst]

Your badly-named edge is an image, not a bounding box. Don't call your image edge since that's a built-in function. You can call bwconvhull() to get a single blob from all the edges and then use regionprops(binaryImage, 'BoundingBox') to find the bounding box that you can then pass in to imcrop(). Write back if you have trouble.

[Kogila wanee]

thank you sir, i tried that, but if the background white/no illuminations then i can crop it , but if the image have the illuminations (light effect) then i cant crop it , it crop the entire image?

how can i remove those illuminations??

Here is my code..........

clc;

clear all;

close all;

[inputfilename,dirname] = uigetfile('*.*');

inputfilename = [dirname, inputfilename];

Image = imread(inputfilename);

hsvImage = rgb2hsv(Image);

sImage = hsvImage(:, :, 2);

mask = sImage > 0.1;

mask = bwareafilt(mask,1);

mask = imfill(mask, 'holes');

props = regionprops(logical(mask), 'BoundingBox');

croppedImage = imcrop(rgbImage, props.BoundingBox);

figure,imshow(croppedImage);title('Cropped Image');