MATLAB: Comparing images

images

I want to compare images by taking a difference of their images but those values are just limited to 0 and 255. if i subtract 0-255 it gives me a 0 and if its 255-0 the answer is 255. how do i make them subtract like normal numbers so i can calculate the difference and get negative values too?

Best Answer

Cast them to double before you add or subtract uint8 or uint16 images.

diffImage = double(uint8Image1) - double(uint8Image2);

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MATLAB: Matlab integer format for answer

Try a function, like int32(), fix(), ceil(), floor(), uint8(), int32(round()), etc.

a = (2+24)/(4*3) % Floating point.
aInteger = int32(a)
whos aInteger; % int32
aInteger = round(a)
whos aInteger; % Double


aInteger = floor(a)
whos aInteger; % Double
aInteger = ceil(a)
whos aInteger; % Double
aInteger = fix(a)
whos aInteger; % double
aInteger = uint16(a)
whos aInteger; % uint16

Note that with round(), ceil(), floor(), and fix() you will end up with a double but with no fractional part. If you want an actual integer, you have to cast to an integer data type with int32(), int16(), etc.

MATLAB: Problem to adding pixel values

Try this at the command line:

uint8(255) + uint8(2)

And then this

double(uint8(255)) + double(uint8(2))

Best Answer

Related Solutions

MATLAB: Matlab integer format for answer

MATLAB: Problem to adding pixel values

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