Can't view binary image

Question

Mesho 2023-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/1947173-can-t-view-binary-image

评论： Image Analyst 2023-4-17

Dear all, I couldn't view the binary image after runing this code

    fab_img = imread('fabric.png');
    Img = rgb2gray(fab_img);
    BW1 = edge(Img,'sobel');
    figure (500)  
    fig500 = gcf;
    ax2 = subplot(1,1,1, 'Parent', fig500);
    image(ax2, (BW1));

Any idea how to solve it without using imshow function?

Meshoo

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Answer 1

Image Analyst 2023-4-14

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I would use imshow also. But if you insist on using image you can do it if you multiply the logical matrix by 255:

fab_img = imread('fabric.png');
Img = rgb2gray(fab_img);
BW1 = edge(Img,'sobel');
image(255 * BW1);

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Mesho 2023-4-17

Thank you Image Analyst. I want a solution to the 'image' function properties such that it can show a binary image (not by changing my binary image to another a color or gray image).

Image Analyst 2023-4-17

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Sorry we can't help you. We offered solutions and for some baffling reason you rejected all of them. "The idea here is not to use imshow function."

fab_img = imread('fabric.png');

subplot(2, 2, 1);

imshow(fab_img);

Img = rgb2gray(fab_img);

BW1 = edge(Img,'sobel');

% Option 1

subplot(2, 2, 2);

imshow(BW1);

% Option 2

subplot(2, 2, 3);

image(255 * BW1);

% Option 3 leave as binary but must convert to 3-D RGB image

subplot(2, 2, 4);

image(cat(3, BW1, BW1, BW1));

The display is just for your viewing pleasure. It doesn't have anything to do with the analysis of the image. I don't know how the image is displayed is of such great concern to you. Just pick one and go with it.

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Answer 2

Praveen Reddy 2023-4-14

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编辑：Praveen Reddy 2023-4-14

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Hi Mustafa,

I understand that you want to display binary image in a figure. You can use "imshow" method to display binary image.Refer to the following modified code.

fab_img = imread('fabric.png');
Img = rgb2gray(fab_img);
BW1 = edge(Img,'sobel');
figure (500)  
fig500 = gcf;
ax2 = subplot(1,1,1, 'Parent', fig500);
imshow(BW1);