How to use image labeled resulted from Image labeler App (black image) to calculate jaccard Index?

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yasmin ismail 2023-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/2031159-how-to-use-image-labeled-resulted-from-image-labeler-app-black-image-to-calculate-jaccard-index

评论： yasmin ismail 2023-10-9

I used pixel label from image labeler App and after I finished labeling I used Export to file . Then I opened the file which created called PixelLabeData and I found the labeled image is totally black and the label not shown, I undertsand that I have to use the following code to let label appear

figure;

[i, m] = imread('Label_1.png');

imshow(i,m)

but then I want to use this labeled image in the following equation to calculate jaccrad index, but the image is totally black

A = logical(imread('7001-236.png'));

BW_groundTruth =logical(imread('Label_1.png'));

similarity = jaccard(squeeze(A(:,:,1)), BW_groundTruth)

similarity =

0.0925 because label image is black

so how to fix it?