VisionWorks OpenCV Interoperability API functions

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

I want to first take image with opencv and convert VisionWorks(OpenVX) after making some process with Visionworks , output will be OpenCV imshow but when i convert openvx to opencv i take some mistakes could you help me?

void nvx_cv::copyVXMatrixToCVMat(mat_v,edges1);

this void or int functions not working.

2

Hi,

You can find visionworks sample in /usr/share/visionworks/sources.
Check the sample named as samples/opencv_npp_interop to get some idea about opencv <-> visionworks.

Thanks.

3

Thank you for requesting. I solved it .

4

Hi,

There are some information in our document:
[i]> VisionWorks Toolkit Reference Documentation

VisionWorks API
NVIDIA Extension API
OpenCV Interoperability API
convertCVMatTypeToVXImageFormat[/i]

Support image type are:

  • NVX_DF_IMAGE_2F32
  • NVX_DF_IMAGE_2S16
  • NVX_DF_IMAGE_F32
  • NVX_DF_IMAGE_RGB16
  • VX_DF_IMAGE_RGB
  • VX_DF_IMAGE_RGBX
  • VX_DF_IMAGE_S16
  • VX_DF_IMAGE_S32
  • VX_DF_IMAGE_U16
  • VX_DF_IMAGE_U8

Thanks

5

Thank you for contribution.I solved my problem with “nvx_cv::VXImageToCVMatMapper” function. Program gets video frame with OpenCV and returns OpenVX image.After OpenVX operations turns into OpenCV mat type and at last take output image with OpenCV again.

Here is the code:

#include <iostream>
#include "NVX/Application.hpp"
#include "opencv2/opencv.hpp"
#include <NVX/nvx.h>
#include <NVX/nvx_timer.hpp>
#include <NVX/nvx_opencv_interop.hpp>
#include <NVX/Application.hpp>
#include <NVX/ConfigParser.hpp>
#include <OVX/FrameSourceOVX.hpp>
#include <OVX/RenderOVX.hpp>
#include <NVX/SyncTimer.hpp>
#include <OVX/UtilityOVX.hpp>
using namespace cv;

vx_context context = vxCreateContext();

int main(int, char**)
{

VideoCapture cap("/home/ubuntu/VisionWorks-1.6-Samples/data/parking.avi");
    if(!cap.isOpened()) 
        return -1;

    Mat edges,edges1;
    namedWindow("Window",1);
    for(;;)
    {

Mat frame;
Mat frame2;
cap >> frame;

vx_image v_src = nvx_cv::createVXImageFromCVMat(context,frame);

//
// OpenVX operations...
//

nvx_cv::VXImageToCVMatMapper mapper (v_src,0,NULL,VX_READ_AND_WRITE,VX_MEMORY_TYPE_HOST);
cv::Mat copy_frame = mapper.getMat();

        imshow("Window", copy_frame);
        if(waitKey(30) >= 0)
	{
		 break;
	}
    }

}
6

Good to know this. : )