How can i convert YCBCR image to binary image.

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Sarmad Paracha 2018-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/426545-how-can-i-convert-ycbcr-image-to-binary-image

评论： Image Analyst 2018-10-30

I am making a project using image processing and i need to convert the rgb image to YCBCR and then convert it to binary image.

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Answer 1

Image Analyst 2018-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/426545-how-can-i-convert-ycbcr-image-to-binary-image#answer_343848

There are functions rgb2ycbcr() and imbinarize().

If those don't work, read this link and write back.

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Image Analyst 2018-10-28

在 MATLAB Online 中打开

imbinarize() was introduced in R2016a so I'm not sure why you had an error running it. Unfortunately you forgot to post the second half of the error message - what the actual error was.

Try this code. No guarantee it's being binarized in the way that you like though.

RGB = imread('peppers.png');
subplot(3, 3, 1);
imshow(RGB);
title('Original Image', 'FontSize', 20);
% For some reason, set the green channel to black.
RGB(:,:,2) = 0;
subplot(3, 3, 2);
imshow(RGB);
title('Now with Green Channel Erased', 'FontSize', 20);
% Convert to YCbCr
YCBCR = rgb2ycbcr(RGB);
yChannel = YCBCR(:, :, 1);
cbChannel = YCBCR(:, :, 2);
crChannel = YCBCR(:, :, 3);
subplot(3, 3, 4);
imshow(yChannel, []);
title('Y Image', 'FontSize', 20);
subplot(3, 3, 5);
imshow(cbChannel, []);
title('Cb Image', 'FontSize', 20);
subplot(3, 3, 6);
imshow(crChannel, []);
title('Cr Image', 'FontSize', 20);
% Now binarize with imbinarize, introduced in R2016a
binaryY = imbinarize(yChannel);
binaryCb = imbinarize(cbChannel);
binaryCr = imbinarize(crChannel);
subplot(3, 3, 7);
imshow(binaryY, []);
title('Y Image Binarized', 'FontSize', 20);
subplot(3, 3, 8);
imshow(binaryCb, []);
title('Cb Image Binarized', 'FontSize', 20);
subplot(3, 3, 9);
imshow(binaryCr, []);
title('Cr Image Binarized', 'FontSize', 20);

Sarmad Paracha 2018-10-30

在 MATLAB Online 中打开

I want to explain you what i am really trying to do. Actually i am trying to do image processing to detect fire using RGB and YCBCR and applying some rules to these color spaces. one of which is to suppress max value of B component so bright light sources are not detected as fire. This is just the initial stage. That is also the reason i am binarizing image and filling holes.I will also be using bounding box and centroid properties. This is the code i have written so far to see how things work.

    RGB= imread('1.tif');
          subplot(3,3,1);
          imshow(RGB);
          RGB(:,:,3) = 0;
          subplot(3,3,2);
          image(RGB);
          YCBCR = rgb2ycbcr(RGB);
          subplot(3,3,3);
          imshow(YCBCR);
          BW = imbinarize(YCBCR);
          subplot(3,3,4)
          imshow(BW)
          title('Original Image Converted to Binary Image')
          BW2 = imfill(BW,'holes');
          subplot(3,3,5)
          imshow(BW2)
          title('Filled Image')
      >> PROJECT1
      Error using imbinarize
      Expected I to be two-dimensional.
      Error in imbinarize>validateImage (line 240)
      validateattributes(I,supportedClasses,supportedAttribs,mfilename,'I');
      Error in imbinarize>parseInputs (line 176)
      validateImage(I);
      Error in imbinarize (line 113)
      [I,isNumericThreshold,options] = parseInputs(I,varargin{:});
      Error in PROJECT1 (line 10)
      BW = imbinarize(YCBCR);

Sarmad Paracha 2018-10-30

在 MATLAB Online 中打开

I dont think it is a issue with software it is just the code. I used the image from the examples and binirized it without changing its colour space and it runs

I = imread('coins.png');
subplot(1,3,1);
imshow(I)
title('Original Image')
BW = imbinarize(I);
subplot(1,3,2);
imshow(BW)
title('Binary Image')
BW2 = imfill(BW,'holes');
subplot(1,3,3);
imshow(BW2)
title('Filled Image')

Image Analyst 2018-10-30

imbinarize() works with gray scale images. "coins.png" is a gray scale image while "1.tif" is NOT.

Note how you tried to binarize YCBCR, a multiband image, while I did not. I binarized just the Y, Cb, or Cr channels alone, which are grayscale. That is why your code did not work while mine did.

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How can i convert YCBCR image to binary image.

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How can i convert YCBCR image to binary image.

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