Visibility Checking Method for Railway Signals by Cab-mounted Camera

Nagamine, Nozomi; Ukai, Masato

doi:10.2219/rtriqr.54.85

Cited by 3 publications

(1 citation statement)

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“…This paper therefore proposes a method for detecting blinking obstruction warning signals, based on a system which identifies the signals' near-infrared LED light emitted in specific patterns [2]. In this method, the LED light emission patterns of different obstruction warning signals, are recognized by the difference from the frame average, but this system is for the purpose of inspection and cannot detect emissions in real time.…”

Section: Introductionmentioning

confidence: 99%

Blinking Detection for Obstruction Warning Signal using Front Camera

Mukojima

Nagamine

Nomura³

et al. 2021

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When a something occurs that could hinder a train passing a level crossing, obstruction warning signals are turned on to show that trains must stop. At present, this system relies on the driver's visual observation. This research aims to make this system more reliable and secure. This paper proposes a method to detect blinking obstruction warning signals and describes evaluation tests that were performed. Evaluation test results showed that these blinking signals could be detected with a detection rate of about 90 percent at a distance 600 meters under running conditions.

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Section: Introductionmentioning

confidence: 99%

Blinking Detection for Obstruction Warning Signal using Front Camera

Mukojima

Nagamine

Nomura³

et al. 2021

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Recent Research and Development of Signaling and Telecommunications Technologies

Hiraguri¹

2015

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The simulation of an installation position of wayside signals using video sequences from the train cab

Nagamine¹,

Ukai²

2014

WIT Transactions on the Built Environment

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This research aims to create a simulator that would generate simulated images for use when investigating where to install wayside signals along a railway track. Because the installation of wayside signals requires such considerations on as visibility from the driver's booth, the current installation measures involve that a staff member holds a simulated emergency wayside signal at a given point and the wayside signal's visibility is confirmed from a position located in a required distance. These operations require, for both the signal staff and train operation staff, the scheduling of a date for meeting on-site after a lengthy process; this is one reason why it takes considerable time before wayside signals are actually installed. To deal with this problem, we have developed a simulation method that displays a virtual driver's-eye view of wayside signals on a track by using images of signals overlaid onto the fore view out of the train. This simulation was then used to establish and adjust scheduled wayside signal positions. The simulation uses the fore view of the cabin footage (taken with a camcorder) from the driver'seye view and the camera parameters (focal length, height) used therein to predict the three-dimensional space. This three-dimensional space is predicted by using track gauge onscreen as a limiting parameter and solving simultaneous equations. Track gauge is calculated by means of rail extraction techniques used during image processing. The simulation technique cuts back the time needed to study wayside signal positions on-site and requires no restrictions on train schedules or operation. This report describes the algorithms used and explains how to achieve verification by our test data.

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Visibility Checking Method for Railway Signals by Cab-mounted Camera

Cited by 3 publications

References 1 publication

<b>Blinking Detection for Obstruction Warning Signal using Front Camera</b>

<b>Blinking Detection for Obstruction Warning Signal using Front Camera</b>

<b>Recent Research and Development of Signaling and Telecommunications Technologies</b>

The simulation of an installation position of wayside signals using video sequences from the train cab

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