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Dependencies

OpenCV built with CUDA and OpenGL support is required by default. Alternatively one can switch to CPU rendering code-path (much slower), which doesn’t depend on CUDA and OpenGL support in OpenCV:

• change the following values in imagebroker.json (see inline comments there for guidance):

  1. chains/main/elements/gpuproc/elements/export/type to "export_to_hostmem"

  2. chains/main/elements/exporter/device_id to "cpu_dev"

Installing OpenCV on Linux

See linux/install_opencv.sh script, which builds OpenCV library with CUDA and OpenGL support. It was tested on Ubuntu 20.04, NVIDIA Jetson Linux (L4T) 32.7, 35.2 and 35.4. On Ubuntu it is assumed that CUDA repository is already installed in the system.

Installing OpenCV on Windows

The simplest way to use OpenCV on Windows is to download the official release: https://opencv.org/releases/ (tested with version 4.6.0). The downside of this solution is a lack of CUDA and OpenGL support. To have OpenCV detected, after unpacking the package add environment variable named OpenCV_DIR with value equal to path to build sub-directory of the unpacked OpenCV package. Also another path has to be added to PATH environment variable (pay attention to cmake output) or *.dll files copied from that directory near the resulting imagebroker.exe executable (so to build*/bin directory) to be able to run the sample application.