differenceOfGaussia​nFilter

differenceOfGaussianFilter() creates difference of Gaussian channel filters in 2D (DoG)

EXAMPLE OF USE:
L=differenceOfGaussianFilter(); % generates the channel filters with default parameters
L=differenceOfGaussianFilter(imgSize); % generates the channel filters at the given image size (as a 2D vector) with default parameters
L=differenceOfGaussianFilter(imgSize,N,std0,alpha,Q); % generates N channel filters at the given image size (as a 2D vector) and the specified values for std0, alpha and Q