Using nvdewarper element for homography

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
1

Hi,

I’m trying to use the nvdewarper element to apply an homography transformation matrix that I obtained by executing the OpenCV function cv2.findHomography(…). The result from that function is a 3x3 matrix. I’ve successfully used the nvdewarper for image undistortion in the past, but I don’t know how to structure the nvdewarper config file in order to apply an homography transformation. Is there any example for this use case?

Thank you in advance.

3

Hi,

Is VPI an option for you?
It can adopt the OpenCV transform matrix directly:
https://docs.nvidia.com/vpi/sample_perspwarp.html

Thanks.

5

Hi AastaLLL,

thanks for the response, I am afraid we can’t use VPI as we currently deploy only a gstreamer pipeline, so that would mean we have to write a new element that utilizes that code. Isn’t there any form of information of what this element can do? Can it actually perform such a transformation ? Thanks in advance.

6

Hi,

For nvdewarper component, you can find more info in the below GitHub.
There are also some samples (configure) that you can refer to.

Thanks.