For technical help / support with GTrack, and its sub components, please send an email to bbyrne at cc.gatech.edu

Contents

• Introduction
• Overview of the Components

• Basics

• The btf file format

• Avi Input Processing

• ctag: Color Selection Application
• bsubtract: Background subtraction
• cmvbtf: Color Segmentation of video files

• btf File Processing

• timestamp: Add a correct timestamp to a btf file
• identify: Correlate objects from frame to frame

• Results Viewing Applications

• avitools: Overlay btf info onto an avi file
• TeamView: Graphical btf Viewer

• Download

• Download a static package containing a tutorial and sample movie

Introduction

The GTag set of applications is designed to help researchers analyze video files. The GTag suite was developed in the BORG Lab at Georgia Tech.

Overview

The GTag application suite is made up of a group of small, single task utilities. For optimal performance, the utilities are designed to be run in a specific order. Each of the sections below will provide a breif description of the various components. Please see the appropriate project page for more details.

The btf File Format

The btf file format is a plaintext format for describing picture files. Please see the btf Guide for a complete description of this format.

CTag: Color picker

The CTag application is used to choose the correct color definitions for fast color segmentation. It takes in one or a sequence of pictures, and then allows the user to select live on those pictures the colors they wish to use for cmvbtf.

bsubtract: Background Subtraction

bsubtract is an optional program you can run as a preprocessing stage to remove a background from an image. bsubtract will remove a background by removing anything that holds still over a period of time.

cmvbtf: Fast Color Segmenter

cmvbtf takes the color definition files from CTag and runs them through the CMVision color segmentation program.

timestamp: Timestamp btf files

A DV file from a camera comes with time in a HH:MM:SS format. You can use timestamp to give you a timestamp in a milliseconds since 1970 format.

identify: Object Tracker

identify is a program that will associate objects from one frame to the next.

avitools: Data and AVI file merger

Often you will want to view btf data overlayed onto an avi from where the data came. avitools will allow you to do this in numerous ways.

TeamView: Data viewer

Another way to view your btf data in a visual manner. Please see the TeamView Homepage for more information.

Download

NEW TUTORIAL FILE! Contains sample movies for steps along the way, overview of the process, etc.
File: Tutorial File MD5: 9cf589800d1d3792024155ce15625f64

New: Version 1.0 of GTrack. This file contains statically linked binaries, as well as source.
File: Binary File MD5: 9b17ce83dda6851fe1528d20a2554583

Avitools in the 1.0 package segfaults. Download a new version here