Vehicle Detection with OpenCV

Simple demo of vehicle detection with OpenCV cascade classifier. Tested with OpenCV 3

Install

Typically we install the latest OpenCV in Python 3 with:

pip install opencv-python

which has binary wheels (no-compile install) for most platforms.

Usage

python3 vehdet.py data/video.avi -q

Omitting the -q allows live display, which is much slower--particularly on embedded systems.

Notes

data source

X11 Virtual Frame Buffer

On systems without an X11 server, a virtual frame buffer can be used. This method is used in general where a program wants a display but doesn't have a video server.

apt install xvfb

then create a file ~/xvfb.sh:

#!/bin/bash
Xvfb :99 -screen 0 1024x768x16 &
export DISPLAY=:99

and run that file when a program needs a display on a display-less system.

Libraries

On certain Linux platforms, you may need to install shared libraries:

apt install libwebp-dev libtiff-dev libjasper-dev libilmbase-dev libopenexr-dev libgstreamer1.0-dev libavcodec-dev libavformat-dev libswscale-dev libqtgui4 libqt4-test

to resolve errors including:

ImportError: libwebp.so.6: cannot open shared object file: No such file or directory

ImportError: libtiff.so.5: cannot open shared object file: No such file or directory

ImportError: libjasper.so.1: cannot open shared object file: No such file or directory

ImportError: libImath-2_2.so.12: cannot open shared object file: No such file or directory

ImportError: libIlmImf-2_2.so.22: cannot open shared object file: No such file or directory

ImportError: libgstbase-1.0.so.0: cannot open shared object file: No such file or directory

ImportError: libavcodec.so.57: cannot open shared object file: No such file or directory

ImportError: libavformat.so.57: cannot open shared object file: No such file or directory

ImportError: libswscale.so.4: cannot open shared object file: No such file or directory

ImportError: libQtGui.so.4: cannot open shared object file: No such file or directory

ImportError: libQtTest.so.4: cannot open shared object file: No such file or directory