How can i know my first image is master image and second image my current image how can i find the noise raito between this two images.

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Shri.s 2023-10-4

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https://ww2.mathworks.cn/matlabcentral/answers/2028924-how-can-i-know-my-first-image-is-master-image-and-second-image-my-current-image-how-can-i-find-the-n

回答： Drishti 2024-9-30，14:33

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Walter Roberson 2023-10-4

Note that it would be easier for people to experiment if you were to post those as separate images instead of as one pair.

Walter Roberson 2023-10-4

See immse

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Answer 1

Drishti 2024-9-30，14:33

在 MATLAB Online 中打开

Hi Shri.s,

To distinguish between the master image and the current image, you can perform statistical analysis, including histogram analysis.

Introducing noise to an image will typically result in a distinct change in the histogram, differentiating it from the original, noise-free version.

You can refer to the MATLAB Documentation of ‘imhist’ function for producing histogram of image data.

https://www.mathworks.com/help/releases/R2024a/images/ref/imhist.html

Furthermore, the noise ratio can be calculated by utilizing the difference of standard deviation between the images.

Refer to the implemented work around for better understanding:

% Calculate the difference image
difference_image = abs(double(master_image) - double(current_image1));
% Calculate noise level (standard deviation of the difference image)
noise_level = std(difference_image(:));
% Calculate signal level (mean of the master image)
signal_level = mean(double(master_image(:)));
% Calculate noise ratio
noise_ratio = noise_level / signal_level;