function call:

[out_img1r,out_img1i]=vsg('FFTGaussian',sizex,sizey,std);

 

Arguments:

sizex – an integer specifying the horizontal dimension of the output image.

sizey – an integer specifying the vertical dimension of the output image.

std – a double specifying the standard deviation of the output Gaussian kernel.

 

Description:

out_img1r – the output image values are the real FFT coefficients which make up a 2d Gaussian bell curve if the zero frequency was at the centre

out_img1i – the output image values are the imaginary FFT coefficients which are set to zero.

 

Example:

w = 100;

h = 82;

sd = 1.6;

[out_img1r,out_img1i]=vsg('FFTGaussian',w,h,sd);

h=figure;imagesc((out_img1r(:,:,1)));colormap(gray);set(h,'Name','FFTGaussian');

 

Notes:

The function always outputs a 3 channel image, all of which are identical. A single channel may be selected if needed.