sum of absolute differences

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nomad nomad
nomad nomad 2012-3-30
回答： indhumathi gunasekar 2016-9-29
Good evening everyone,
I have two images which I seek correspondence by correlation using the sum of absolute differences (SAD) to find the disparity map.
I do not know how to apply the formula of SAD.
thank you
  1 个评论
vimal
vimal 2012-6-26
You can directly use correlation method..
corr2(im1,im2) is the code for calculating the correlation between two images.
for more details type
doc corr2
in command window..

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回答（3 个）

Jan
Jan 2012-6-26
While imabsdiff is implemented as efficient MEX (no temporary array created), you can calculate the "sum of absolute differences" easily by hand also:
img1 = rand(640, 480, 3);
img2 = rand(640, 480, 3);
difference = img1 - img2;
absolute = abs(difference);
result = sum(absolute(:));
It is less obvious for UINT8 images, because abs(uint8(10) - uint8(20)) is not uint8(10), uint8(0) due to the saturation effects. If this is not wanted, convert the UINT8 image to double at first.
Alex Taylor
Alex Taylor 2012-3-30
If you have the Image Processing Toolbox, consider looking at the function imabsdiff as a starting point for computing the absolute difference between two images.
help imabsdiff
indhumathi gunasekar
i have two 16*16 matrix,i need to find SAD between this. can anyone help me out?

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