Downsample image with a custom kernel

Goran_N — Fri, 21 Oct 2011 16:45:02 GMT

Hi there,
I need to downsample images using custom-crafted kernels. I was not able to find an IPP function to do this. I could filter an image using the custom kernel and then nearest-neighbor it, but the efficiency is critical and I don't want to filter pixels I will throw away. In addition I must use separable filter/downsample (1D in X and Y, again for performance). So what I really need is a 1D filter with custom kernel and a stride (filter at every n-th pixel), do this in X and Y, and then pick a subset of pixels (every n-th pixel) to get the output image.

Are there IPP functions that will help me do this?
Thanks!

Downsample image with a custom kernel

Chao_Y_Intel — Fri, 28 Oct 2011 06:14:18 GMT

Hello,

Have you checked the multirate FIR function? Can it meet your requirement?
http://software.intel.com/sites/products/documentation/hpc/ipp/ipps/ipps_ch6/functn_FIR.html

Thanks,
Chao

topic Downsample image with a custom kernel in Intel® Integrated Performance Primitives

Downsample image with a custom kernel

Downsample image with a custom kernel