How to copy pixels using a raster?

Let say there is a 7x5 matrix (16-bit image) with the following values, and a raster with equdistant length of 3 pixels between the lines. So I want to copy every 3rd value into a new 3x2 matrix

=>

 0  3  6
21 24 27

I tried ippiCopySubpix_16u_C1R  but it does not seem to be the correct function. Do you have any ideas how to solve it? I'm using IPP 5.2.

Thanks.