Remove unwanted area of image ?

Hi Everyone,

I want to remove unwanted area of an image by apply image processing. But i stuck to remove area after thresholding.

Could anyone help ?

Bellow is my step.

Img = imread('image.png')

img = im2gray(img)

img = img<150

imshow(img)

Thanks and Regards!

Han

Answer 1

[Matt J]

A=im2gray(imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1147135/image.png'));

A(205:260,:)=[];

imshow(A)

[Jenifer NG]

thanks for your help.

I want to define removed area by threshold.

Could we define the removed area by threshold ?

for example: the remove area = height of white square in my image.

[Matt J]

A=im2gray(imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1147135/image.png'));

idx=sum(edge(A),2)>3.9;

imshow(A(~idx,:)); shg

[Jenifer NG]

It really work nice!

If i want to remove more than 1 area. Could we do it automactic ?

for example: I want to remove 3 areas as picture bellow

[Matt J]

Did you try it? It worked for me.

[Jenifer NG]

Oh it work for me also.

I used wrong image

Thanks you

Answer 2

[Taru]

Hi,

Try the below code, it performs image matrix manipulation to get the required output.

img=imread('image.png');
im2=img>150;
sz=size(img)
row=sz(1,1);
col=sz(1,2);
psz=0;
for i=1:row
    if im2(i,:)==im2(1,:)
        psz=psz+1;
    end
end
patchsize=psz;
nimg=[img(1:sz/2-patchsize,:);img(1:patchsize,:);img(sz/2+patchsize:end,:)];
imshow(nimg)

[Jenifer NG]

thank you!

If i want to remove more than 1 area. Could we do it automactic ?

for example: I want to remove 3 areas as picture bellow

[Image Analyst]

Try this:

grayImage = imread('boxes.png');
subplot(2, 2, 1);
imshow(grayImage, []);
impixelinfo;
% Get mask
mask = grayImage > 143;
% Get rid of stripe
mask = imclearborder(mask);
% Enlarge by one layer
mask = imdilate(mask, true(3));
subplot(2, 2, 2);
imshow(mask, []);
impixelinfo;
% Fill in the mask regions in the original image.
grayImage(mask) = 0;
grayImage = regionfill(grayImage, mask);
subplot(2, 2, 3);
imshow(grayImage, []);
impixelinfo;

[Jenifer NG]

Thanks you so much!

I got it