MATLAB: How to convert two rgb images into grayscale? and then subtract

subtraction of images

I have two images in jpg format(one as reference image and other is captured image) . I want to convert them to grayscale and want to subtract them. How to do this?

Thanks in Advance.

Best Answer

img1 = imread('Image1.jpg');
img2 = imread('Image2.jpg');
D    = rgb2gray(img1) - rgb2gray(img2)

Related Solutions

MATLAB: How to convert gray or indexed images to color images

That image is a 2D image, an indexed image with a color map. It's not a 3D color RGB image. You need to convert it to an RGB image if you recognize it's an indexed image. Replace your loop with this:

for k = 1:numel(bmpFiles)
  fullInputFileName = fullfile(inputFolder,bmpFiles(k).name)
  [originalImage, colorMap] = imread(fullInputFileName);
  [rows, columns, numberOfColorChannels] = size(originalImage)
  if ~isempty(colorMap) && numberOfColorChannels == 1
    % It's an indexed image with a colormap.
    % Convert it to RGB color
    originalImage = ind2rgb(originalImage, colorMap);
    [rows, columns, numberOfColorChannels] = size(originalImage)
  end
  fullOutputFileName = fullfile(outputFolder, bmpFiles(k).name);
  outputImage = imresize(originalImage, [100,50]);
  [rows columns numberOfColorChannels] = size(outputImage);
  if numberOfColorChannels == 1
    % It's monochrome, so convert to color.
    outputImage = cat(3, outputImage, outputImage, outputImage);
  end
  
  figure,imshow(outputImage);
  imwrite(outputImage, fullOutputFileName);
end

MATLAB: How to solve this error in converting RGB to grayscale

That code is for Octave, not for MATLAB.

rgb2gray is built into the Image Processing toolbox, which is required by the Computer Vision toolbox.

If you do not have the Image Processing toolbox then you can implement using the equation that is documented on the rgb2gray documentation page.

Best Answer

Related Solutions

MATLAB: How to convert gray or indexed images to color images

MATLAB: How to solve this error in converting RGB to grayscale

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