How to replace image pixels

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sejugn jung 2019-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/474893-how-to-replace-image-pixels

回答： Image Analyst 2019-8-5

I have an image and a csv file. I want to change the pixel value of the image to the values in the csv file. How do I do that?

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Adam 2019-8-5

Load the image, load the csv file, index into the image and replace values. Write the image to file again if desired.

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Answer 1

Image Analyst 2019-8-5

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Try this if your data is stored row, column, new gray level:

data = csvread(filename);  % Assumes columns of row, column, new gray level, NOT x, y, new gray level
rows = data(:, 1);
columns = data(:, 2);
newValues = data(:, 3);
for k = 1 : length(rows)
    grayImage(rows(k), columns(k)) = newValues(k); % Replace this pixel of grayImage with a new value.
end

If your data is in the form x, y, gray level, you need to do this:

data = csvread(filename);  % Assumes columns of x, y, new gray level, NOT row, column, new gray level
rows = data(:, 2);
columns = data(:, 1);
newValues = data(:, 3);
for k = 1 : length(rows)
    grayImage(rows(k), columns(k)) = newValues(k); % Replace this pixel of grayImage with a new value.
end