topic Re: How to use some IPP functions about image processing? in Intel® Integrated Performance Primitives

How to use some IPP functions about image processing?

qujiang — Tue, 19 Feb 2008 07:09:42 GMT

Llately, I am researching some image-processing functions in IPP. But I encountered some problems forthefunctions as followed: ippiCrossCorrFull_Norm_8u_C3RSfs, ippiDistanceTransform_3x3_8u_C1R, ippiWarpPerspective_8u_C3R, ippiCanny_32f8u_C1R, ippiDFTFwd_RToPack_32f_C3R.

Who can help me? Give me someexamples aboutthis functions.

My email is: whu200232580137@yahoo.com.cn

Re: How to use some IPP functions about image processing?

Vladimir_Dudnik — Wed, 20 Feb 2008 14:54:13 GMT

Hello,

your question is quite clear. I would recommend you to take a look on IPP samples package. For example, you may take a look on MPEG4 codec in audio-video-codecs sample or image-processing sample to see how to use ippiWarp functions.

Regards,
Vladimir

Re: How to use some IPP functions about image processing?

qujiang — Fri, 22 Feb 2008 08:36:32 GMT

Hello,Vladimir! I know there are some examples about this functions. But I didn't explain clearly. I want to use this functions with OpenCV, so I need to use data structure of OpenCV. For example:

void dft()
{
const int M=3;
IppiSize msz={M,M};

IplImage* img=cvLoadImage("c101001.jpg",1);
IplImage* med1=cvCreateImage(cvGetSize(img),8,3);
CvMat *mat = cvCreateMat(img->width,img->height,CV_32FC1);
CvMat *dst = cvCreateMat(img->width,img->height,CV_32FC1);

IppiSize size = {img->width-M+1,img->height-M+1};
double isz=1./(img->width*img->height);

int wstep = (img->width) * sizeof(IplImage);
Ipp8u* pBuffer = ippiMalloc_8u_C1(img->width, img->height,&wstep);
ippiDFTFwd_RToPack_32f_C3R(&CV_IMAGE_ELEM(img,float,M/2,M/2*3), img->widthStep,&CV_IMAGE_ELEM(med1,float,M/2,M/2*3), med1->widthStep, pDFTSpec, pBuffer);
ippsFree(pBuffer);
}

There is something wrong in the function:ippiDFTFwd_RToPack_32f_C3R.

Could you do me a favor?

Re: How to use some IPP functions about image processing?

Vladimir_Dudnik — Tue, 26 Feb 2008 08:04:36 GMT

I'm sure there is nothing wrong in ippiDFTFwd_RToPack_32f_C3R function. You just need to refer to IPP documentation for this function to see how you need to call that, what is the parameters and what is the range of values are expected by this function.

Regards,
Vladimir