Binarizing image with single pixels

Question

Mat 2024-1-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2075791-binarizing-image-with-single-pixels

回答： Animesh 2024-1-30

I have some photos of random pixels marked on a low noisy background. I want to binarize the image, in order to have a clear array of 0s and 1s, and I would like to make each spot as one element of the matrix.

What I did was to grayscale the image, and then try to binarize it. Unfortunately, it is not enough. Adding Adaptive histeresys equalisation (Ae = adapthisteq(Ag);) makes it worst. Maybe strel function could help?

Thanks

This is my code. I think code will be similar to datamatrix and QR code reading.

Thank you

if dim ~= 1

Ag = rgb2gray(photo);

else

Ag = photo;

end

Ab=imbinarize(Ag);

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Answer 1

Animesh 2024-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/2075791-binarizing-image-with-single-pixels#answer_1399481

Hi @Mat

If you're working with an image that has random pixels against a faintly noisy background and wish to detect those random pixels, you can employ morphological operations to enhance the features of the spots and distinguish them from the background noise.

A suggested approach you can try is:

Step 1: Convert the image to greyscale (if not already).

Step 2: Apply a filter to reduce noise.

Step 3: Binarize the image using thresholding.

Step 4: Use morphological operations to clean up the image and isolate the spots.

You can refer to the following documentation on morphological operations: