How Can I Take the Inverse of an Image Matrix in MATLAB?

[Az83]

I'm trying to take the inverse of an image matrix by doing the following:

>> A=imread ('noise.jpg');
>> inv(A)

But I'm getting the following error:

? Undefined function or method 'inv' for input arguments of type 'uint8'.

How can I change the image matrix so that I can take the inverse of it?

 

[redbrain]

Erm what?! hah

well what lanagauge is that?! Matlab?
maby try inv('noise.jpg') :S

hmmm i duno not sure would be easier to know what language your doing it in and what functions or methods you have available.

 

[jtbell]

If this is C++, you must be using some non-standard add-on library. imread() and inv() are not standard C++ functions, as far as I know.

 

[DrGreg]

I'm trying to take the inverse of an image matrix by doing the following:

>> A=imread ('noise.jpg');
>> inv(A)

But I'm getting the following error:

? Undefined function or method 'inv' for input arguments of type 'uint8'.

How can I change the image matrix so that I can take the inverse of it?

I recognise this as MATLAB. It would have helped if you had said so.

imread() takes an image file and returns an N x M x 3 array of 8-bit unsigned integers. inv() expects an N x N array of floating points.

I have to ask why would you want to invert an image array? I don't understand the point.

 

[chroot]

I also don't understand why you'd want the matrix inverse of an image, but you can use this:

inv(double(A))

You just need to convert the array to the double-precision floating-point datatype before inv() will know what to do with it.

- Warren