topic Re: Re:Replicate border of 1D data array in Intel® Integrated Performance Primitives

Replicate border of 1D data array

gilles73 — Mon, 06 Sep 2021 15:13:00 GMT

Hi,

Do you know a function or a code like the function CopyReplicateBorder in the library of image processing to obtain the fast copy with the borders replication of an one-dimensional array Ipp32f ?

Thanks in advance

Re:Replicate border of 1D data array

ShanmukhS_Intel — Tue, 07 Sep 2021 08:14:07 GMT

Hi,

Thanks for reaching out to us.

>>Do you know a function or a code like the function CopyReplicateBorder in the library of image processing?

Please refer the below link which might help you.

https://software.intel.com/content/www/us/en/develop/documentation/ipp-dev-reference/top/volume-2-image-processing/image-data-exchange-and-initialization-functions/copyreplicateborder.html

If this is not what you are looking for, Kindly provide us details more specific on the functionality so that we could assist you.

Best Regards,

Shanmukh.SS

Re: Re:Replicate border of 1D data array

gilles73 — Tue, 07 Sep 2021 15:00:13 GMT

Hi Shanmukh,

As explained, my input is a pointer to an 1D array of float (Ipp32f), not of image type. But, it seems as a "Pointer to the source image ROI" is not be different from a pointer to an array, is it ?

I will try to use CopyReplicateBoder with a vector of float as input data.

Thanks

Gilles

Re: Re:Replicate border of 1D data array

Andrey_B_Intel — Fri, 17 Sep 2021 14:50:57 GMT

Hi Gilles.

You can either use ippiCopyReplicateBorder_32f_C1R for 1d vector too or use pipeline of ippsSet_32f+ippsCopy_32f functions. See details in code below:

#include <stdio.h> #include "ipp.h" #define LEN 16 #define BRD 4 IppStatus CopyReplicateBorder(const Ipp32f* pSrc, int srcLen, Ipp32f* pDst, int dstLen, int left) { #define MIN(A,B) ((A)<(B))?(A):(B) ippsSet_32f(pSrc[0], pDst, MIN(left,dstLen)); dstLen -= left; if (dstLen > 0) { pDst += left; ippsCopy_32f(pSrc, pDst, MIN(srcLen, dstLen)); dstLen -= srcLen; } if (dstLen > 0) { pDst += srcLen; ippsSet_32f(pSrc[srcLen-1], pDst, dstLen); } } int main() { Ipp32f pSrc[LEN]; Ipp32f pDst[LEN+2*BRD]; int n; for (n = 0; n < LEN; n++) { pSrc[n] = n + 1; } #if 1 IppiSize srcroi = {LEN , 1}; IppiSize dstroi = {LEN + 2 * BRD, 1}; int topBorderHeight = 0; int leftBorderWidth = BRD; ippiCopyReplicateBorder_32f_C1R( pSrc, LEN*sizeof(Ipp32f), srcroi, pDst,(LEN+2*BRD) * sizeof(Ipp32f), dstroi, topBorderHeight, leftBorderWidth); #else CopyReplicateBorder(pSrc,LEN,pDst, LEN+2*BRD, BRD); #endif printf("pSrc:\n"); for (n = 0; n < LEN; n++) { printf("%.2f ", pSrc[n]); } printf("\n"); printf("pDst:\n"); for (n = 0; n < LEN+2*BRD; n++) { printf("%.2f ", pDst[n]); } printf("\n"); return 0; }

Andrey B.