how to smoothen only the high intensity pixel in a color image

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alexander 2021-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/844410-how-to-smoothen-only-the-high-intensity-pixel-in-a-color-image

评论： Image Analyst 2021-7-29

采纳的回答： Image Analyst

@Image Analyst i want to smoothen or reduce the pixel value high pixels can anyone help me with the code part

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Answer 1

Image Analyst 2021-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/844410-how-to-smoothen-only-the-high-intensity-pixel-in-a-color-image#answer_713675

在 MATLAB Online 中打开

Just get a mask where the bright regions are, then blur the image and then replace only where it's blurred and in the mask

Something like (untested)

% Separate into individual color channels.
[r, g, b] = imsplit(rgbImage);
% Get mask of where the bright pixels are.
brightMask = rgb2gray(rgbImage) > 220; % Or whatever value you want.
% Blur entire image.
windowWidth = 15;
kernel = ones(windowWidth, windowWidth) / windowWidth^2;
blurryR = imfilter(r, kernel);
blurryG = imfilter(g, kernel);
blurryB = imfilter(b, kernel);
% Replace mask pixels with smoothed/blurred ones
r(brightMask) = blurryR(brightMask);
g(brightMask) = blurryG(brightMask);
b(brightMask) = blurryB(brightMask);
% Reconstruct output image from individual color channels.
outputImage = cat(3, r, g, b);

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alexander 2021-6-4

Thank you so much sir

Image Analyst 2021-7-29

在 MATLAB Online 中打开

To dim the bright regions (ONLY) by 20 gray levels in each color channel, do this:

% Replace mask pixels with smoothed/blurred ones
r(brightMask) = blurryR(brightMask) - 20;
g(brightMask) = blurryG(brightMask) - 20;
b(brightMask) = blurryB(brightMask) - 20;
% Reconstruct output image from individual color channels.
outputImage = cat(3, r, g, b);