00935378

Component

https://doi.org/10.3141/1804-11

http://scholar.google.com...iley&publication_year=2002

An algorithm with which to estimate mean vehicle speed from roadside cameras owned by a traffic management agency is presented. These roadside cameras are not calibrated nor are calibration marks available in the scene. However, estimating camera calibration coefficients is the most important step in extracting quantitative information about the three-dimensional world from the two-dimensional image. Within this framework an algorithm is presented that performs a simplified dynamic calibration and estimates mean vehicle speed. Many algorithms depend on point correspondences between the earth coordinates and the image coordinates as well as targets of known shape to obtain accurate results. However, in the work presented, the goal is to estimate the mean of a distribution of vehicle speeds, and it is demonstrated that a simplified form of calibration is adequate for making an accurate mean speed estimate. Dynamic camera calibration is performed with training sets of 10-s video sequences. The proposed method detects moving vehicles in a set of consecutive frames. This information, together with mean vehicle dimension estimates, is used to create scaling factors that are used to infer a relationship between motion in the image and motion in the earth coordinate system. The proposed algorithm has a camera model with a reduced number of camera calibration parameters. The algorithm is validated with simulated data and actual traffic scenes.

This paper appears in Transportation Research Record No. 1804, Transportation Data and Information Technology Research.

English

p. 77-84

2002

Transportation Research Record

0309077303

Figures (10) ; References (12)

Algorithms; Calibration; Estimates; Intelligent transportation systems; Mean (Statistics); Traffic speed; Validation; Video cameras

Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Dec 10 2003 12:00AM

• CLEANING OF MATCHED LICENSE PLATE DATA
• COMPARISON OF DISTANCE ESTIMATES FOR COMMODITY FLOW SURVEY: GREAT CIRCLE DISTANCE VERSUS NETWORK-BASED DISTANCES
• COSTS AND BENEFITS OF USING INTELLIGENT TRANSPORTATION SYSTEMS AS AN ALTERNATIVE DATA SOURCE: CASE STUDY
• DECISION SUPPORT SYSTEM FOR ADVANCED TRAFFIC MANAGEMENT THROUGH DATA FUSION
• DESIGN CHARACTERISTICS OF NATIONAL TRAVEL SURVEYS: INTERNATIONAL COMPARISON FOR 10 COUNTRIES
• DEVELOPMENT OF AN XML-BASED SPECIFICATION FOR TRAFFIC MODEL DATA EXCHANGE
• EFFECT OF FIELD SETUP ON ACCURACY OF TRAFFIC DATA COLLECTION USING MACHINE VISION TECHNOLOGY
• EFFECTS OF AMBIENT LIGHT, CAMCORDER SETTINGS, AND AUTOMATED LICENSE PLATE READER SETTINGS ON PLATE TRANSCRIPTION RATES
• ENABLING AND MANAGING GREATER ACCESS TO TRANSPORT DATA THROUGH METADATA
• ESTIMATING TRAVEL TIME SUMMARY STATISTICS OF LARGER INTERVALS FROM SMALLER INTERVALS WITHOUT STORING INDIVIDUAL DATA
• INTEGRATED SIGN ORDERING SYSTEM THROUGH NETWORKING AND RULE BASE APPLICATIONS
• MEASURING VARIABILITY IN TRAFFIC CONDITIONS BY USING ARCHIVED TRAFFIC DATA
• MONTE CARLO SIMULATION IN SAMPLING TECHNIQUES OF TRAFFIC DATA COLLECTION
• OBJECT-ORIENTED GEOGRAPHIC INFORMATION SYSTEM DATA MODEL FOR TRANSIT TRIP-PLANNING SYSTEMS
• PROTOTYPE CLASSIFICATION TOOL FOR SUPPORTING MAINTENANCE OF TRAFFIC SIGNAL TIMING PLANS
• REAL-TIME TRAFFIC MEASUREMENT FROM SINGLE LOOP INDUCTIVE SIGNATURES
• RECONSIDERATION OF SAMPLE SIZE REQUIREMENTS FOR FIELD TRAFFIC DATA COLLECTION WITH GLOBAL POSITIONING SYSTEM DEVICES
• REDUCTION OF VIDEO LICENSE PLATE DATA
• SIMULATION STUDY OF ESTIMATION OF INDIVIDUAL SPECIFIC VALUES OF TIME BY USING ADAPTIVE STATED-PREFERENCE SURVEY
• SPATIAL BEHAVIORAL DATA: COLLECTION AND USE IN ACTIVITY SCHEDULING MODELS
• TECHNIQUES FOR BUILDING MULTIJURISDICTIONAL GEOGRAPHIC INFORMATION SYSTEM PLATFORMS FOR TRANSPORTATION ANALYSIS
• TEMPORAL DATA CONSTRUCTS FOR MULTIDIMENSIONAL TRANSPORTATION GEOGRAPHIC INFORMATION SYSTEM APPLICATIONS
• TIME-USE METADATA
• TRANSIT VEHICLES AS TRAFFIC PROBE SENSORS
• TRAVEL-TIME ESTIMATES OBTAINED FROM INTELLIGENT TRANSPORTATION SYSTEMS AND INSTRUMENTED TEST VEHICLES: STATISTICAL COMPARISON
• USE OF INTERNET-BASED HOUSEHOLD TRAVEL DIARY SURVEY INSTRUMENT
• USE OF VESSEL FREIGHT DATA TO FORECAST HEAVY TRUCK MOVEMENTS AT SEAPORTS
• XML-BASED TRANSIT TIMETABLE SYSTEM