Communications: electrical – Vehicle detectors – With camera
Patent
1996-01-24
1998-06-16
Hofsass, Jeffery
Communications: electrical
Vehicle detectors
With camera
340936, 340942, 340905, 348148, 348149, 364436, 364438, G08G 1017
Patent
active
057677948
DESCRIPTION:
BRIEF SUMMARY
This application is based on international application PCT/DE94/00854, which designated the United States of America and which was filed on Jul. 22, 1994.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process and a device for traffic surveillance.
2. Description of the Related Art
DE 40 32 459 A1 discloses a process and a device for determining and recording vehicle speeds for the purpose of traffic surveillance, using an electronic camera having a memory, a computing circuit for calculating the vehicle speed and a reproduction device. The electronic camera, operating on the basis of CCD elements, is provided with two objectives which can be adjusted with respect to each other in terms of their acceptance angle. At defined points in time, images of the vehicle are recorded, stored in electronic devices and processed. In detail, a first image of the vehicle is acquired using the first objective of the camera, is temporarily stored and is compared with a second image from the first objective, the vehicle speed being calculated in the computing circuit from the lateral offset between the two images. Using the second objective, the license number is acquired, is displayed with further data in the viewfinder image and is stored. The control of the storage of the images from the second objective can be carried out automatically by means of the computing circuit, and the stored images and data can then be displayed on a monitor.
Furthermore, EP-0 188 694 A2 discloses a process and a device for the photographic recording of vehicles by means of a speed measuring device which is equipped with an image recording device, oncoming vehicles being measured and recorded in image form. After the entry of a vehicle into a measurement section, a specific speed measured value is determined and the image recording device is triggered, while inserting the value into the recording. Subsequently, in a further measurement section, the measurement signal, which is generated there, is evaluated further and the result is used for checking the speed value measured initially. Using this known arrangement, a high measurement reliability is achieved. The image recording device can be an electronic video camera having a magnetic recording medium. A Doppler radar measurement device, which generates a Doppler signal, of which the frequency is proportional to the relative speed between vehicle and radar device, from the transmitted radiation and the radiation reflected by the vehicle in a manner disclosed in DE-B 1 805 903 by superimposing on part of the transmitting energy the received energy reflected from the vehicle. The recording camera requires its own data insertion device which is driven via an input/output stage of a microcomputer which, as a function of the checking, triggers either the insertion of the speed measured value or the annulment of the measurement and a subsequent further transport of the recording medium.
DE 39 08 069 A1 discloses a device for measuring, recording and indicating the vehicle speed. The device comprises a video camera with a range measuring device fastened thereto. The measured range values are fed to a microprocessor which calculates the speed of the vehicle therefrom. This value is fed to a memory which is connected to the microprocessor and which is connected to an insertion device arranged in the video camera. The insertion device inserts the measured speed values and, if appropriate, the date and the time as well, into the video image. In the case of this device, too, a special insertion device is necessary in order to be able to display the speed data in the video image and to record the data with the latter.
DE 26 46 636 C2 discloses a process for the surveillance of the speed of a vehicle, in which the passage time of the vehicle through the image region of a television camera is measured. When the vehicle enters the image region of the measuring television camera, a pulse generator is triggered. The counting pulses from the generator are counted for as long
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patent: 4717815 (1988-01-01), Goede
patent: 4866438 (1989-09-01), Knisch
patent: 4988994 (1991-01-01), Loeven
patent: 5515042 (1996-05-01), Nelson
Borsch Manfred
Pfaff Reiner
Hofsass Jeffery
Leica Sensortechnik GmbH
Lieu Julie B.
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