Journal of Advanced Transportation

Research Article

Automatic Traffic Data Collection under Varying Lighting and Temperature Conditions in Multimodal Environments: Thermal versus Visible Spectrum Video-Based Systems

Table 2

Summary of lighting test cases.
(a)
Lighting conditionVehicle speedClassification
Sample SizeSeasonRoad typeVideo lengthSeasonRoad type
Daytime      
 Overcast100 vehiclesWinterSegmentEvery 10 s for 30 minutesSummerIntersection
 Sun, little shadowSpringSummerIntersection
 Sun, slight shadowsSpringN/AN/A
 Sun, strong shadowsSummerSummerIntersection
Nighttime      
 High visibility100 vehiclesSpringSegmentEvery 10 s for 30 minutesWinterIntersection
 Medium visibilityIntersection
 Low visibilityIntersection
(b) Sample camera views under different lighting conditions
Daytime conditionsThermal cameraRegular cameraNighttime conditionsThermal cameraRegular camera
OvercastHigh visibility
Sun, little shadowMedium visibility
Sun, strong shadowsLow visibility