NVIDIA VPI GStreamer Plug-in/Examples/Overlay

GstVPI
GstVPI Basics
Getting Started
Evaluating GstVPI Getting the Code Building the Plugin
Examples
Gaussian Filter Undistort Harris Keypoints Detector KLT Tracker Perspective Warp Overlay Videoconvert Videoscale Convolution Separable Convolution
Performance
Nano TX1 TX2 Xavier
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Introduction

The vpioverlay element draws boxes over the image from the metadata produced by the vpiharrisdetector and vpiklttracker elements. In the case of vpiharrisdetector it computes a small box around each detected keypoint.

Element properties

• color
  

Color to draw the boxes. Available options:

black: Black color for boxes

white: White color for boxes

Flags: readable, writable
Default: "black"

Example

The following example pipe will draw key points and corners detected with the vpiharrisdetector element in your input video stream. You may modify the properties values according to the information above.

gst-launch-1.0 nvarguscamerasrc ! nvvidconv ! 'video/x-raw,format=GRAY8' ! vpiupload ! vpiharrisdetector gradient-size=3 block-size=3 nms-distance=8 sensitivity=0.01 strength-thresh=20 ! vpioverlay color=white ! vpidownload ! nvvidconv ! 'video/x-raw(memory:NVMM),format=I420' ! nvoverlaysink

gst-launch-1.0 nvarguscamerasrc ! nvvidconv bl-output=false ! 'video/x-raw(memory:NVMM),format=GRAY8' ! vpiupload ! vpiharrisdetector gradient-size=3 block-size=3 nms-distance=8 sensitivity=0.01 strength-thresh=20 ! vpioverlay color=white ! vpidownload ! nvvidconv ! 'video/x-raw(memory:NVMM),format=I420' ! nvoverlaysink