This repository is the C++ Source Code of several algorithms of Extracting Background, which are based on OpenCV libraries after I learn about the theory of these algorithms. These Extracting Background Algorithms includes Frame-Difference Algorithm, Background-Difference Algorithm, ViBe Algorithm, ViBe+ Algorithm.

Extracting Background Algorithms' Theory

I wrote a blog about these algorithms' theory. And here is the web address:
《背景提取算法——帧间差分法、背景差分法、ViBe背景提取算法》
《论文翻译：ViBe+算法（ViBe算法的改进版本）》
The Paper of ViBe+ Algorithm's web address:
《Background Subtraction: Experiments and Improvements for ViBe》

Files Introduction

• src - Source Codes' Path
  • FramesDifference - source codes of Frame-Difference Algorithm
  • BGDifference - source codes of Background-Difference Algorithm
  • ViBe - source codes of ViBe Algorithm
  • ViBe+ - source codes of ViBe+ Algorithm
• Image - the Path of Screenshot of Test Programs
• Video - the Path of Test Video
• CMakeLists.txt - CMake File of this Project

Tutorial for Generating this Project

1. My Working Environment

• Operating System: Ubuntu 14.04 LTS
• Conditions before your cmake command:
  • have already done OpenCV's make & make install
  • have already done CMake's make & make install

Besides, I also wrote the tutorial blog of how to install OpenCV 2.4.9 in Ubuntu 14.04. Here are the websites:
CSDN：http://blog.csdn.net/ajianyingxiaoqinghan/article/details/62424132
GitHub：upcAutoLang/Blog#1

2. CMake this Project

Open a terminal and enter in the path of folder named GLCM_OpenCV, then input commands like below:

cmake ./
make

Then you will build this project.

The path of binary files - /BackgroundSplit-OpenCV/build/bin The path of library files - /BackgroundSplit-OpenCV/build/lib

Test Results

I run these 3 kinds of Algorithms by using video whose path is /BackgroundSplit-OpenCV/Video/Camera Road 01.avi, and 3 kinds of Algorithms' results are like below: the result of Frame-Difference Algorithm:
the result of Background-Difference Algorithm: the result of ViBe Algorithm: the result of ViBe+ Algorithm:

P.S: **1. Efficiency of ViBe Algorithm: **
the result of Debug Version:

Time of Update ViBe Background: 15.5914ms
Time of Update ViBe Background: 15.7827ms
Time of Update ViBe Background: 15.2309ms
Time of Update ViBe Background: 15.3791ms
Time of Update ViBe Background: 16.5063ms
Time of Update ViBe Background: 16.0289ms

the result of Release Version:

Time of Update ViBe Background: 3.88142ms
Time of Update ViBe Background: 3.71257ms
Time of Update ViBe Background: 3.59945ms
Time of Update ViBe Background: 3.35824ms
Time of Update ViBe Background: 3.57153ms
Time of Update ViBe Background: 3.44415ms

**2. Efficiency of ViBe+ Algorithm: **
the result of Debug Version:

Time of Update ViBe+ Background: 224.118ms
Time of Update ViBe+ Background: 222.495ms
Time of Update ViBe+ Background: 223.623ms
Time of Update ViBe+ Background: 243.826ms
Time of Update ViBe+ Background: 224.687ms
Time of Update ViBe+ Background: 223.875ms

the result of Release Version:

Time of Update ViBe+ Background: 66.9405ms
Time of Update ViBe+ Background: 67.1447ms
Time of Update ViBe+ Background: 69.6733ms
Time of Update ViBe+ Background: 68.3159ms
Time of Update ViBe+ Background: 67.0427ms
Time of Update ViBe+ Background: 75.1574ms
Time of Update ViBe+ Background: 68.5131ms

It shows that the amount of calculation increased and the efficiency of calculation decreased after increasing algorithm's complexity.