MATLAB: Question on image coefficients using matlab

question on image coefficients using matlab

I am getting the coefficients using imread() function,but coefficients are more than 256*256,but I want to get 256*256 pixels or blocks.

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doc imresize.

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MATLAB: Question on Image transformation

Hi Mubeen,

If you have R2013a, you should look at the class projective2d and the function imwarp.

http://www.mathworks.com/help/images/ref/imwarp.html http://www.mathworks.com/help/images/ref/projective2dclass.html

You can use projective2d to compute forward and inverse point transformations. You can use imwarp and projective2d together to form the resampled output image that is produced by applying a projective transformation.

If you are using previous versions of the Image Procesing Toolbox, you should use the analogous workflow with maketform('projective',___) and imtransform.

We refer the transformation you are referring to as a projective transformation in the Image Processing Toolbox.

MATLAB: Ridge regression coefficient question

Good question! This took a while to figure out, and I can see the help text is not clear about it. The calculations are actually always based on a scaled X under the hood, but the results are adjusted later to be usable with the unscaled data. In particular, the ridge parameter is interpreted as applying to the scaled data. You can reproduce the ridge results by computing R in your code as follows:

R = X'*X + lambda*diag(var(X));

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MATLAB: Question on Image transformation

MATLAB: Ridge regression coefficient question

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