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View Code? Open in Web Editor NEWC++ Equivalents of some Matlab Functions. These were used in my work when I was working with Intel Performance Primitives.
C++ Equivalents of some Matlab Functions. These were used in my work when I was working with Intel Performance Primitives.
I found the fftshift implementation very helpful. By the way, for speed I did modify this function to use std::rotate which makes it significantly faster and simplifies it. Here is the version I have (note that my version takes a line stride parameter since I am working with images that may not be tightly packed:
/**
* circshift
*
* Does a 2D circular shift like the Matlab command.
*
* Inputs:
* out* - pointer to a buffer for the result
* in* - pointer to the input data
* xdim - size of the x-dimension
* ydim - size of the y-dimension
* step - line stride size in bytes
* xshift - shifting to be done along x-dimension
* yshift - shifting to be done along y-dimension
*
*/
template<typename T>
inline void circshift(const T *in, T *out, int xdim, int ydim, unsigned int step, int xshift, int yshift) {
yshift = yshift % ydim;
if (yshift < 0) {
yshift = ydim + yshift;
}
for (int i = 0; i < xdim; i++) {
int ii = (i + xshift) % xdim;
if (ii < 0) {
ii = xdim + ii;
}
T *out_row = reinterpret_cast<T *>(reinterpret_cast<char *>(out) + ii * step);
const T *in_row = reinterpret_cast<const T *>(reinterpret_cast<const char *>(in) + i * step);
std::rotate_copy(in_row, &in_row[yshift], &in_row[ydim], out_row);
}
}
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