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Morphological image processing

Morphological image processing. April 4, 2012. Example binary image B. Grayscale image f( x,y ). z = randn (100); z = conv2( z,ones (7),'same');. Z_BW=z>5; figure; imagesc (Z_BW). BW image filtered by convolution. figure; imagesc (conv2(double(Z_BW),ones(5),'same')).

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Morphological image processing

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  1. Morphological image processing April 4, 2012

  2. Example binary image B Grayscale image f(x,y) z =randn(100); z = conv2(z,ones(7),'same'); Z_BW=z>5; figure; imagesc(Z_BW)

  3. BW image filtered by convolution figure; imagesc(conv2(double(Z_BW),ones(5),'same')) Image is smoothed but no longer binary (black and white)

  4. >> strel ('disk', 5) >> strel ('square', 5) Neighborhood: 0 0 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 0 0 1 1 1 1 1 0 0 Neighborhood: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 >> strel ('line', 5, 90) Neighborhood: 1 1 1 1 1 >> strel ('arbitrary', [0 0 1 0 0; 0 0 1 0 0; 1 1 1 1 1; 0 0 1 0 0; 0 0 1 0 0]) Neighborhood: 0 0 1 0 0 0 0 1 0 0 1 1 1 1 1 0 0 1 0 0 0 0 1 0 0 >> strel ('line', 5, 45) Neighborhood: 0 0 1 0 1 0 1 0 0

  5. Erosion B A Binary Image Structuring element Image eroded with structuring element

  6. Erosion B A Binary Image Structuring element Image eroded with structuring element

  7. imerode(Z_BW,strel('disk',1))

  8. Dilation B A Binary Image Structuring element Image dilated with structuring element

  9. imdilate(Z_BW,strel('disk',1)) Notice lone pixels take the shape of the structuring element

  10. ~imerode(Z_BW,strel('disk',1)) imdilate(~Z_BW,strel('disk',1))

  11. imopen(Z_BW,strel('disk',1))

  12. imclose(Z_BW,strel('disk',1))

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