MATLAB: Luminance component of an image

luminance component of an imageMATLAB Compiler

Hi, I have a frame of a vedio sequence I which is a 288*532 double. How can I extract only the luminance component? Thanks.

Best Answer

Run the following:

I = imread('test.png');
J = rgb2gray(I);

rgb2gray uses the same formual which is used to calculate luminance (to 3 decimal places the formula is):

0.299 * R + 0.587 * G + 0.114 * B

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MATLAB: Creating a movie sequence from rgb images

for frame_idx = start_frame:end_frame
       image = dataset(:,:,frame_idx);
       msk = mask_stack(:,:,frame_idx);
       boundary = edge(msk, 'canny'); 
       rgb = repmat(image,[1 1 3]);
       rgb(:,:,1)=max(boundary,image);
       rgbf(:,:,:,frame_idx)=rgb;
  end
  mov = immovie(rgbf); implay(mov);

MATLAB: Error using rgb2gray

C = rgb2gray( imread(FileNameGoesHere));

Or if you already have an image array in I then just

C = rgb2gray(I);

Best Answer

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MATLAB: Creating a movie sequence from rgb images

MATLAB: Error using rgb2gray

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