how to convert pixel value to 0 and 1 only or (0 and 255) only?

Question

yasmin ismail 2023-10-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033894-how-to-convert-pixel-value-to-0-and-1-only-or-0-and-255-only

评论： Dyuman Joshi 2023-10-16

I tried to used (rgb2gray) and (imbinarize) for each image but I cannt get only 1 and 0 value , still have 148 and others

how to fix it?

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yasmin ismail 2023-10-15

编辑：Walter Roberson 2023-10-15

在 MATLAB Online 中打开

@Dyuman Joshi thanks alot

but I got another error as following:

im = imread('Label7027_157.png');
im_gray2 = rgb2gray(im);
im_bin2 = imbinarize(im_gray2);
all(ismember(im_bin2,[0 1]),'all')
im = imread('new7027-157.png');
im_gray1 = rgb2gray(im);
im_bin1 = imbinarize(im_gray1);
all(ismember(im_bin,[0 1]),'all')
%%Jcard index
A = imread(im_bin1);
BW_groundTruth =imread('im_bin2');
similarity = jaccard(A, BW_groundTruth)

Error using imread>parse_inputs (line 504)

The file name or URL argument must be a character vector or string scalar.

Error in imread (line 342)

[source, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});

Error in trial2 (line 25)

A = imread(im_bin1);

how to fix it?

Image Analyst 2023-10-15

在 MATLAB Online 中打开

Don't call imread (you already did that) and don't put quotes around im_bin2 in this line:

BW_groundTruth = imread('im_bin2');

Do this instead:

BW_groundTruth = im_bin2;

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Answer 1

Dyuman Joshi 2023-10-15

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033894-how-to-convert-pixel-value-to-0-and-1-only-or-0-and-255-only#answer_1333679

在 MATLAB Online 中打开

Use the binary images obtained via imbinarize as the input to jaccard -

im2 = imread('Label7027_157.png');
im_gray2 = rgb2gray(im2);
im_bin2 = imbinarize(im_gray2);
all(ismember(im_bin2,[0 1]),'all')
ans = logical
   1
im1 = imread('new7027-157.png');
im_gray1 = rgb2gray(im1);
im_bin1 = imbinarize(im_gray1);
all(ismember(im_bin1,[0 1]),'all')
ans = logical
   1
%% Jcard index
similarity = jaccard(im_bin1,im_bin2)
similarity = 0.1260

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yasmin ismail 2023-10-15

7027-157.jpg

@Dyuman Joshi thanks alot for your help, my last question do you have any suugestion to improve the smilarity between the two images , i used label app to labeled crack in the original attached image(7027-157.png), then I got the labed image (label 7027_157.png) and i compared it with (new7027_157.png) .I applied jaccard index but as you know creating ground truth doesnt give accurate result although if you see the labeled and (new7027_157.png) approximatly same , so is there another way to measure similarity instead of jaccard indix , like compare number of pixels or anything else. I am not expert in image processing and new biggener in matlab. I appreciate your help

Dyuman Joshi 2023-10-16

@yasmin ismail, That question is not related to your original question. Also, it is more related to Image processing than it is related to MATLAB. So, I will not be answering it (nor do I have enough experience with Image processing).

And I see that you have already asked a new question here - https://in.mathworks.com/matlabcentral/answers/2033924-is-there-a-method-to-capire-similarity-between-two-images

So, if my answer solved the questions you have asked, please consider accepting it.

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