MATLAB: How can i check if an image is RGB or grayscale or binary

checkimagetypes

I'm a new in matlab, need answer to this question.. And, may i change the size of matrix of RGB image to two-dimensional matrix? I wanna try edge detection, i load an grayscale image but the image matrix show an image have three-dimensional matrix.. Any solutions?? Thank you for your response..

Best Answer

You can convert to grayscale using a combination of all color channels:

grayImage = rgb2gray(rgbImage);

Or you can extract one of the color channels:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

You can get the size (dimensions) like this:

[rows columns numberOfColorChannels] = size(yourImageArray);

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MATLAB: How to code image types

Try this:

grayImage = imread(fullFileName);
% Get the dimensions of the image.
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
	% It's not really gray scale like we expected - it's color.
	% Use weighted sum of ALL channels to create a gray scale image.
% 	grayImage = rgb2gray(grayImage);
	% ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
	% which in a typical snapshot will be the least noisy channel.
	grayImage = grayImage(:, :, 1); % Take red channel.
end
if max(grayImage(:)) == 1 && length(unique(grayImage(:))) == 2
    % It's binary because it has only two values: 0 and 1
else
    % It's grayscale
end

You can also use isa(grayImage, 'logical') or similar to identify what class it is.

MATLAB: How to do Contrast Enhancement of color image

Not sure what you mean by that. But there are several possibilities. You could convert the image to hsv color space with rgb2hsv, then use imadjust on the v channel, and convert back to RGB with hsv2rgb.

Or you could do the same thing on the s channel to make the colors more vivid.

Or you could use imfilter on the v channel to enhance edges.

These all produce different effects.

Best Answer

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MATLAB: How to do Contrast Enhancement of color image

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