> The electronic police as the traffic control,
grasp the racket to violate regulations, to obtain the evidence one
method, in recent years in national each interurban widespread use,
its overall construction discrimination has been allowed to divide is
two parts, one is exterior hardware equipment, two is the later period
processes software, separately performs for this our its two parts to
elaborate:
First, exterior hardware equipment
The electronic police exterior hardware equipment may
divide three systems by its function in, they are front end the
induction system, stresses the photography to like the system, rear
end the transmission system.
1st, front end induction system
Front end the induction system is in the electronic
police overall equipment tentacle, its goal is for induce to has
motion the vehicle, says from the realization theory, front end the
inductor has the many kinds of forms, like the infrared inductor, the
microwave inductor, the sound navigation and ranging inductor, the
coil inductor, the linearity striation inductor, the video frequency
inductor and so on, at present in various cities electron police the
main use are the coil inductor.
The infrared inductor is two installs the emission of infrared
radiation and the receiver in the path, when has the infrared the
change to examine the vehicles the migration, this kind of inductor
disturbs too in a big way in the urban road, installs the condition to
be harsh, may use on the highway, but the promotion is not strong.
The microwave inductor is nearby the path 立杆, the
installment microwave detector, this kind is similar to the microwave
alarm apparatus inductor also receives on the path greatly disturbance
and so on motor vehicle big motive, pedestrian, at present not too has
used.
The coil inductor is the present electron police uses most one
kind of inductor, because its installment convenient, accurate rate
higher, moreover price low, is widely used, but its examination area
is big, under the special condition uses not conveniently.
The linearity striation inductor is studies the development in
the original coil inductor foundation one kind of inductor, its
principle also is examines the motion vehicles to cut the
electromagnetism change which the magnetic line of force produces, but
this kind of inductor in road surface construction simple, the
pavement failure are few, may adapt each kind of road surface symbol
graticule, the solution examination vehicles violates regulations the
phenomenon and so on.
The video frequency inductor was one kind which just appeared in
recent years hardly controls, the software 结合?inductor by the
computer, its principle was examines in the video frequency security
cabinet the image picture element change, if made the integrated
hardware module, then greatly will enhance the examination speed.
2nd, photography system
The photography system is the electronic police obtains
violates regulations the picture, and the recording picture process
equipment, it including photographs the tool and the controller, uses
the electronic police from at present to say, generally uses optics
camera, the digital camera, the digital camera and so on photographs
the tool.
Optics camera is the photography tool which the early electronic
police uses, its performance stable, imagery clarity high, but because
at present uses photographic camera limitation, but photographs with
the roll film 张数 is limited, moreover downloading is artificial
fixed time trades the roll film the trouble.
The digital camera is the present commonly used electron police
photography tool, its picture downloading is convenient, does not have
other expenses, but at present uses the digital camera mostly for the
civil numerical code, works when outside, the performance is
unreliable, specially under the high temperature condition can have
"dying machine" and the chaotic racket. We in the practice work,
carry on the transformation to the camera, causes very multi-purpose
not to work thus reduces oneself to give off heat causes its normal
work.
The camera is the video frequency electron police most commonly
used photography tool, its performance is stable, image transmission
convenience, but as a result of its picture resolution rate
difference, when night photography illuminates the difficulty.
The controller is the electronic police's heart, it connects the
inductor, controls the photographic camera (camera) to distinguish
red, green light signal, carries on the logic operation as well as the
output specific data instrument. At present we mostly use Shan
Banji the system to manufacture, carry on the micro control procedure
the establishment to adopt "and. The way carries on the control
camera photography.
3rd, transmission system
At present uses the transmission system has manual
downloading (manual transmission) and the wired transmission, wireless
transmits three kinds.
Manual downloading is refers artificially trades the roll film
(card) or with then takes along the computer type equipment to
download the electronic police in the street intersection picture and
to bring back to the control center one way.
The wired transmission is refers through the optical fiber or
the electric cable (telephone line) and so on carries on the network
transmission picture the way.
The wireless transmission is refers through public network
(GPRS) and so on carries on the wireless non- region transmission
picture the way.
Second, the later period processes software
When the picture is downloaded after the transmission
control center, needs to carry on the registration, the serial number,
the announcement to the picture, again transmits the central computer
database, prepares each kind of institution to transfer.
This set of processing software also includes the picture and
the data analysis, provides each kind to violate regulations the data
message. Moreover, the electronic police photograph the picture
is uses as the basis, therefore it should strictly have to guard
against the modification process, when uses optics camera carries on
the photography, because to the light sensitive film revision is more
difficult, therefore generally does not use the encryption method,
when uses the digital camera photographs, the picture has become the
electronic documents, regarding this therefore the kind of documents
secret is extremely essential, also is must often important.
At present our commonly used encryption method has several
kinds, one kind is called the hardware encryption, installs in the
electronic police controller to engrave recording machine, the digital
camera photographs each picture, all first will engrave records on the
compact disc, later again through each method downloading
transmission. Moreover several kinds become the software
encryption, namely establishes set of procedures, in sets in the
controller examines the photography each picture picture element, will
record, if the picture will have the revision, then carries on the
primitive picture element and the present picture element the
contrast, but also some one kind of software encryption will be folds
the strength mouth watermark the way, namely picture when photography
downloading, stochastically will have the transparent ripple design
superimposition by the control procedure in the picture the synthesis
and the downloading transmission, will form the picture bottom grain,
if the picture will revise, then certainly will be able to destroy the
bottom grain, thus will play the encryption role.
The electronic police since are photograph the vehicles to
violate regulations to obtain the evidence the method, therefore it on
not only may grasp the racket to rush red candle violating
regulations, moreover it also may grasp pats violates regulations to
its each kind, and carries on statistical and street intersection
signal light time mixing to the street intersection vehicles current
capacity.
1st, with two coils installing underground, may grasp pats
overspeed to violates regulations the phenomenon, and under automatic
recording time and speed.
2nd, the use linear inductor, may grasp pats to violates
regulations to change, to press Huang Xian to violate regulations the
phenomenon.
3rd, uses the double coil the distinction, may grasp pats or
rushes specific line violating regulations to the reversion travel.
4th, use coil inductor, also may grasp pats to violates
regulations to stop the phenomenon, and under the recording disobeys
stops the time and so on.
5th, will have the controller to carry on the data output, may
when the street intersection green light which examines the stream of
vehicles quantity, transmits the semaphore also to be allowed to carry
on 配时 and so on to the semaphore.
Above only has enumerated several typical usages, so long as to
the inductor, photographed the tool, the transmission system, the
later period software full development and the utilization, will
certainly also to have many, renewal usage.
Along with the technical unceasing development, the path
monitoring method also in unceasingly enhances, the electronic
police's performance and the picture photography, the transmission
also unceasingly is developing. For example, the Jiangsu
Yancheng area installment electronic police may realize the signal
light wireless launch gathering control, picture automatic
downloading, the wireless transmission, the system 自停 from
self-starting restore, function and so on long-distance wireless
monitoring electron police active status, this will certainly greatly
to enhance between each interurban traffic control department the
close coordination. When has the Nanjing vehicle to violate
regulations in Shandong east, the vehicle has not possibly become an
official, it violated regulations the picture to launch the Nanjing
traffic guidance center, simultaneously its technology also greatly
had the development on the highway utilization, the vehicles in high
speed male road section violating regulations, had in the next charge
station exportation violates regulations the picture, this will
certainly to the traffic control, the traffic safety to bring the
enormous advantage. |
