MATLAB: Changing black pixels to white.

image processing

How can I keep the small black pixels and change the large lump of black pixels to white?

Best Answer

inverted = ~YourBWImae;   %now black is 1, white is 0

Now you can do bwareafilt() on inverted, telling to keep only the groups that are sufficiently small for your purpose. Then after that, invert the result of that so that black goes back to being represented by 0.

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MATLAB: Increase RGB image saturation.

This is easier in HSV colorspace:

RGB = rand(100, 100, 3);
HSV = rgb2hsv(RGB);
% "20% more" saturation:
HSV(:, :, 2) = HSV(:, :, 2) * 1.2;
% or add:
% HSV(:, :, 2) = HSV(:, :, 2) + 0.2;
HSV(HSV > 1) = 1;  % Limit values
RGB = hsv2rgb(HSV);

MATLAB: Black and white image

Try this

[counts, grayLevels] = imhist(grayImage, 256);
if sum(counts(2:end-1)) > 0
  % It's not pure black and white
end
% Get map of non-0 and non-255 pixels
grayPixels = grayImage > 0 & grayImage < 255;
% Get pure black and white image
bw = grayImage; % Initialize

bw(grayPixels) = 0; % Zero out any gray pixels.
% Get gray pixels only
grayOnly = grayImage; % Initialize
grayOnly(~grayPixels) = 0; % Zero out any pure 0 or pure 255 pixels.

Best Answer

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MATLAB: Increase RGB image saturation.

MATLAB: Black and white image

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