Flat field before/after RGB2gray? Noise Reduction. Which is bettter?

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Rajesh Kontham
Rajesh Kontham 2019-7-23
回答： Etsuo Maeda 2019-7-26
I desire to remove the noise present in my image.
My original image is RGB image and the image processing for my project is done on grayscale image.
I found the either of following ways give different result.
RGB -> imflatfield (image, 20) -> RGB2gray.
RGB -> RGB2Gray() -> imflatfield(grayImage, 20)
What is the best method to remove the noise.

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Etsuo Maeda
Etsuo Maeda 2019-7-26
In imflatfield.m, RGB image input is converted from RGB to HSV. And only HSV value is used for flat-field correction. You can confirm this sequence using edit command. I am not sure which is better way, giving gray scaled image or giving HSV value. But it is possible to see the difference of those images.
A = imread('printedtext.png');
ihsv = rgb2hsv(A);
ihsv = ihsv(:, :, 3);
igray = rgb2gray(A);
montage({ihsv, igray})
HTH

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