Ais-v Specification

Transcript

AIS-V Specification 1 of 6 REV:NC 1.0 GENERAL 1.1 Description. The video detection camera shall produce consistent quality video in all weather, lighting, and traffic congestion levels common to the traffic industry. The camera image sensor shall have high sensitivity for accurate vehicle detection at night and other times of low light levels. It shall be housed in a robust, weather-proof and waterproof sealed enclosure with adjustable sunshield to prevent solar heating and to prevent sunlight from entering the lens to ensure consistent operation and optimal detection performance. A 10X optical zoom auto-iris lens shall be standard with the camera to simplify preliminary engineering, installation, and product ordering and to reduce spare inventory requirements. The zoom lens shall be easily adjusted to the desired field of view for optimal vehicle detection using two (2) wires and a simple two (2) button controller. The camera shall have been designed and tested to meet the rigorous requirements to produce high quality video for vehicle detection processing. 2.0 Video Camera 2.1 The video detection image sensor camera system will use high resolution, monochrome or color image sensors as the video source for real-time vehicle detection. Where low light sensitivity is important monochrome cameras will be used. As a minimum, each video sensor will provide the following capabilities: a. Images will be produced with a CCD sensing element with effective horizontal resolution of at least 750 pixels and effective vertical resolution of at least 494 pixels. Images will be output in one of the following formats: (1) As a video signal conforming to RS170, RS 170A or NTSC specifications. (2) As a video signal conforming to CCIR or PAL specifications. b. Useable video and resolvable features in the video image will be produced when those features have luminance levels as low as 2.0 Lux at night with no AGC. c. Useable video and resolvable features in the video image will be produced when those features have luminance levels as high 10,000 Lux during the day. d. Useable video and resolvable features in the video image will be produced when the ratio of the luminance of the resolved features in any single video frame is 300:1. 2.2 The image sensor optics will be glass to minimize distortions such as “starring” around bright lights. 2.3 The image sensor will use an infrared cut filter between the lens and the CCD. This cut filter must have a 3 dB cutoff at approximately 630 nm. 2.4 The image sensor will be equipped with an auto-iris lens with variable focal length to be adjusted for each site. The maximum aperture of the lens will be prefocused at infinity at the factory, will not be smaller than f1.8 and the minimum aperture of the lens will not be larger than f300. 2.5 The image sensor will have a zoom lens. 2.6 The procedure used to focus the image sensor will require that a neutral density filter be used to ensure the iris is wide open during the focus procedure. This will ensure that optimal focus is available under low light conditions. If auto-focus capability is available, the auto-focus must be turned off. 2.7 The image sensor will operate with a Gamma of 1.0. 2.8 The image sensor will operate with an auto-iris. The auto-iris will operate in a damped manner with a time constant of approximately 0.25 seconds. th 2.9 The image sensor will operate with a fixed speed shutter. The shutter speed will be 1/60 second for NTSC th format video applications and 1/50 second for PAL format video applications. If the image sensor provides autoflicker removal, this may be used. 2 of 6 REV:NC 2.10 The image sensor will operate with automatic gain control or AGC. The maximum value of the AGC must be limited to prevent blooming around bright lights when viewed with higher AGC settings. The AGC will operate in a damped manner with a time constant of approximately one second. The AGC will not be active until the lens aperture is fully opened by the automatic iris control. 2.11 The image sensor will not use backlight compensation and it will not use bright dark compensation. 2.12 The image sensor must operate with average brightness tracking, not peak brightness. 2.13 The image sensor output video signal must be adjustable to ensure that peaks in the video signal output are not clipped when the video signal is within the 1v peak to peak operating range. 2.14 The image sensor video output must meet the requirements shown in the Figure 4, below. By meeting the specifications of Figure 4, the image sensor video output will be properly adjusted so that: 2.14.1 A no-contrast image has 40 IRE units; 2.14.2 The black level is adjusted to 0 IRE units. Figure 4. Requirements for image sensor video output. 2.15 The image sensor must not use edge enhancement unless the iris is fully open. 2.16 The image sensor and lens assembly will be housed in an environmental enclosure that provides the following capabilities: a. The enclosure will be waterproof and dust-tight to IP 66 (NEMA-4) specifications. b. The enclosure will be light-colored and will include a sunshield to minimize solar heating and glare. The front edge of the sunshield will protrude beyond the front edge of the environmental enclosure and will include provision to divert water flow to the sides of the sunshield. The amount of overhang of the sunshield will be adjustable to prevent direct sunlight from entering the lens. c. The enclosure will allow the image sensor to operate satisfactorily over an ambient temperature range from 34˚ C to +60˚ C while exposed to precipitation as well as direct sunlight. d. The faceplate of the enclosure must be glass to ensure that light can pass undistorted to the image sensor within the enclosure. 3 of 6 REV:NC e. An indium tin oxide (ITO) heater will be incorporated onto the enclosure faceplate to prevent the formation of ice and condensation in cold weather. The heater will not interfere with the operation of the image sensor electronics, and it will not cause interference with the video signal. f. The exterior side of the lens will have hydrophilic coating to minimize debris accumulation and reduce maintenance. g. The total weight of the image sensor in the environmental enclosure with sunshield will be less than 2.3 kg (5 lbs). h. The enclosure will allow the image sensor housing to be rotated during installation to permit field of view alignment for optimal video detection. i. The enclosure will include a provision at the rear of the enclosure for connection of manufacturer-supplied power and video signal cables. Input power to the environmental enclosure will be 90 to 115 VAC @ 50/60 Hz, 240 VAC @ 50/60 Hz, or 24 VAC @ 50/60 Hz as will be specified upon order. j. When operating in the environmental enclosure with power and video signal cables connected, the image sensor will meet FCC Class A requirements for electromagnetic interference emissions. 2.17 The video output of the image sensor will be isolated from earth ground. All video connections from the image sensor to the video interface panel will also be isolated from earth ground. The video output stage of the image sensor will include transient protection to prevent damage to the image sensor due to voltage transients occurring on the coaxial video cable leading from the image sensor to the MVP. 2.18 Connections for both video and power will be made to the image sensor using two pig tails, one for power and the other for video. The power cable will provide power as well as safety ground connections. The video will be either NTSC or PAL and 1Vp-p. 2.19 A galvanized steel junction box will be available, as an option, with each image sensor for installation on the structure used for image sensor mounting. The junction box will contain a terminal block for terminating power to the image sensor and connection points for coaxial cables from the image sensor and from the MVP. 2.20 A video interface panel will be available for installation inside the traffic cabinet that houses the rack-based video detection system. The panel will provide coaxial video cable and image sensor AC power connection points. An Edco CX06-BNCY or approved equal transient suppresser will be included for each image sensor to protect each rackbased MVP from transients on the coaxial cable from the image sensor. The shield of the coaxial cable connection at the transient suppresser will be connected to earth ground via the transient suppresser. The image sensor AC power will be connected to the transient protected side of the AC power distribution system in the traffic cabinet in which the MVP is installed. If the coaxial cable that is used to connect the video signal, from the image sensor to the MVP, is routed through a conduit containing AC power cables, the AC power cables will use twisted wires meeting a minimum IMSA 19-1 or 201 specifications. If unbundled AC power cables are routed with the coaxial video cable, a video isolation amplifier may be required in place of the video interface panel. The isolation amplifier will buffer the video signal and provide transient suppression. The isolation amplifier will have a minimum common mode rejection ratio at 60 Hz of 100 dB. 2.21 The image sensor will be connected to the rack-based video detection system such that the video signal originating from the image sensor is not attenuated more than three (3) dB when measured at the MVP. When the connection between the image sensor and the MVP is coaxial cable, the coaxial cable will be a low loss 75 ohm precision video cable suitable for outdoor installation, such as Belden 8281, West Penn P806, or approved equal. 3.0 SUPERVISOR COMPUTER SYSTEM 3.1 The minimum supervisor computer system, as needed for detector setup and viewing of vehicle detections, will consist of a computer and Windows-based interface software. With an optional USB device, it will be possible to view live video outputs on the PC screen. 4 of 6 REV:NC 3.2 The supervisor computer will be one of the following two types: a. A desktop computer located in a control room environment b. A notebook/laptop computer with an LCD display supporting 256 color operation for field use 3.3 Each type of supervisor computer will be available from the supplier of the video detection system. Minimum specifications for the supervisor computer will be as follows: • IBM PC-compatible • Pentium III processor (700 MHz) • Microsoft Windows 2000 or Windows XP with latest Microsoft Service Pack • VGA color monitor and adapter supporting 256 colors and minimum 800 by 600 pixel resolution • Keyboard • Mouse • USB or optional serial ports for serial connectivity • Optional Ethernet port for Ethernet connectivity • 256 MB of RAM • CD-ROM or DVD-ROM drive • 10.0 GB or larger hard disk drive. (150 MB of free disk space are required to install the entire Autoscope Software Suite) 3.4 The supervisor computer will include a Windows-based program to interface with the MVP. This software will provide an easy-to-use graphical user interface and support all models/versions of the supplied MVP. 4.0 INSTALLATION AND TRAINING 4.1 The supplier of the video detection system will be available to consult during the installation and testing of the video detection system and computer equipment. A factory-certified representative from the supplier will be onsite during installation. 4.2 In the event that the supervisor computer is furnished by the contracting agency, such installation and testing will be done at the time that training is conducted. 4.3 Training will be provided to personnel of the agency in the operation, setup and maintenance of the video detection system for the specific application. Instruction and materials will be provided for a maximum of 10 persons and will be conducted at a location selected by the contracting agency. The contracting agency will be responsible for any travel, room and board expenses for its own personnel. The training course will consist of two (2) eight-hour sessions. 4.3.1 Factory-certified general training will also be available at the basic, intermediate, advanced and instructor levels. Each class is typically three or four days. Each student receives a certificate upon satisfactory completion of each class. 4.4 The rack-based video detection system, its MVPs and its support hardware/software comprises a sophisticated leading-edge technology system. Proper instruction from certified instructors is required to ensure that the end-user has complete competency in system operation. The User's Guide is not an adequate substitute for practical classroom training and formal certification by an approved agency. 5.0 WARRANTY, MAINTENANCE AND SUPPORT 5.1 The rack-based video detection system will be warranted by its supplier for a minimum of three (3) years. An additional three (3) year period can be arranged when ordering the system for a total six (6) year warranty. 5.2 Ongoing software support by the supplier will include software updates of the MVP and supervisor computer application. These updates will be provided free of charge during the warranty period. 5 of 6 REV:NC 5.3 The supplier will maintain a program for technical support and software updates following expiration of the warranty period. This program will be available to the contracting agency in the form of a separate agreement for continuing support. 6 of 6 REV:NC