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By: a guest on Apr 25th, 2012  |  syntax: None  |  size: 0.87 KB  |  hits: 12  |  expires: Never
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  1. In need for imaging details
  2. >> a = imread('Hydrangeas.jpg');
  3. >> w = [-1 0 1; -1 0 1; -1 0 1];
  4. >> b = imfilter(a,w);
  5. >> imshow(b)
  6.        
  7. for i < img.height, i++
  8.  for j < img.width, j++
  9.   rsum = pixel[i-1,j-1].R*(-1) + pixel[i-1,j+1].R*(1)
  10.   rsum += pixel[i,j-1].R*(-1) + pixel[i,j+1].R*(1)
  11.   rsum += pixel[i+1,j-1].R*(-1) + pixel[i+1,j+1].R*(1)
  12.  
  13.   gsum = pixel[i-1,j-1].G*(-1) + pixel[i-1,j+1].G*(1)
  14.   gsum += pixel[i,j-1].G*(-1) + pixel[i,j+1].G*(1)
  15.   gsum += pixel[i+1,j-1].G*(-1) + pixel[i+1,j+1].G*(1)
  16.  
  17.   bsum = pixel[i-1,j-1].B*(-1) + pixel[i-1,j+1].B*(1)
  18.   bsum += pixel[i,j-1].B*(-1) + pixel[i,j+1].B*(1)
  19.   bsum += pixel[i+1,j-1].B*(-1) + pixel[i+1,j+1].B*(1)
  20.  
  21.   if rsum>255, rsum=255
  22.   if gsum>255, gsum=255
  23.   if bsum>255, bsum=255
  24.  
  25.   if rsun<0, rsun=0
  26.   if gsun<0, gsun=0
  27.   if bsun<0, bsun=0
  28.  
  29.   img.setpixel(i,j) = (rsum|gsum|bsum)
  30.  end
  31. end
  32.        
  33. y[n] = SUM x[n-k] . h[k]
  34.         k
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