Cypress CY62167EV18 Instrukcja Użytkownika Pobierz pdf (Strona 14)

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8,121,078

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7

data

transmission.

For

example,

by

implementing

a

second

low-bandwidth

radio/transceiver

in

the

wireless

camera,

the

modi?ed

media

access

techniques

can

be

triggered

and

con

trolled

through

the

second

radio.

The

low-bandwidth

radio

can

establish

a

link

in

conditions

where

the

high-bandwidth

radio/transceiver

cannot.

By

incorporating

more

functionality

in

the

base

station

of

the

wireless

network

camera

system,

the

base

station

can

detect

and

correct

link

problems

by

requesting

retransmission

of

the

captured

data.

Such

request

can

be

sent

via the

low

bandwidth

radio

which

can

be

more

reliable

and

use

lower

power

than

the

high-bandwidth

radio.

This

retransmission

can

be

hidden

and

transparent

to

the

client

surveillance

appli

cation

through

the

virtual

web

server

or

relay

server

in

the

base

station.

In

addition,

image

and

video

analytical

functions

such

as

object

recognition,

people

counting,

and

license

rec

ognition

can be

implemented

in

the

base

station

rather

than

the

camera.

These

analytical

functions

can

be

implemented

in

a

hidden

way

so

that

it

logically

appears

to

the

client

that

these

functions

are

occurring

in

the

camera.

Furthermore,

in

appli

cations

where

privacy

of

the

image

or

audio

data

needs

to

be

protected,

the

data

transmitted

wirelessly

can

be

encrypted.

The

speci?c

aspects

may

be

implemented

using

a

system,

method,

or

a

computer

program,

or

any

combination

of

sys

tems,

methods,

and

computer

programs.

The

details

of

one

or

more

embodiments

are

set

forth

in

the

accompanying draw

ings

and

the

description

below.

Other

features,

aspects,

and

advantages

will

be

ascertained

from

the

description,

the

drawings,

and

the

claims.

BRIEF

DESCRIPTION

OF

THE

DRAWINGS

These

and

other

aspects

will

now

be

described

in

detail

with

reference

to

the

following drawings.

FIG.

1

is

a

block

diagram

of

a

battery

powered

wireless

camera.

FIG.

2

shows

a

battery

powered

wireless

network

camera

system

for

remote

surveillance

applications.

FIG.

3

shows

another

battery

powered

wireless

network

camera

system

for

remote

surveillance

applications.

FIG.

4

is

a

diagram

showing

a

burst

data

transmission.

FIG.

5A

shows

a

?ow

chart

of

a

MAC

algorithm

that

can

be

used

by

the

wireless

camera.

FIG.

5B

is

a

?ow

chart

showing

a

process

that

can

be

used

to

implement

the

CTS-to-Self

algorithm.

FIG.

6

shows

a

block

diagram

of

a

battery

current

limiting

circuit

that

can be

used

to

connect

to

the

camera

power

input.

FIG.

7

is

a

block

diagram

of

computing

devices

and

sys

tems.

Like

reference

symbols

in

the

various

drawings

indicate

like

elements.

DETAILED

DESCRIPTION

OF

THE

INVENTION

The

systems,

apparatus

and

techniques

described

herein

relate

to

providing

wireless

network

camera

systems.

For

example,

the

wireless

network

camera

systems

described

herein

can

operate

for

an

extended

period,

e.g.,

months

or

even

years

without

maintenance

in

certain

applications.

By

looking

at

the

energy

requirements

of

the

system

over

time,

the

systems

and

techniques

described

herein

use

a

time-sliced

energy

cycling

technology

to

distribute

processing

needed

over

time

and

location.

Furthermore,

the

systems

and

tech

niques

described

herein

are

combined

with

modern,

available

wireless

technologies

(such

as

the

modulation

schemes

deployed

in

systems

like

WiFi

802.11)

and

off-the-shelf

advanced

semiconductor

components.

As

a

result,

an

overall

20

25

30

35

40

45

50

55

60

65

8

reduction

in

the

camera

power

of

two

or

more

orders

of

magnitude

can

be

achieved.

For

example,

the

wireless

camera

described

herein

can

potentially

operate

on

less

than

10

mW

of

power

on

a sustainedbasis,

and

the

wireless

camera

can run

over

12

months

using

10

AA

Lithium

batteries.

Connection

from

the

base

station to

other

IP

security

video

cameras

and

network

can be

done

via

wired

or

wireless

links.

Each

wireless

camera

connected

to

the

base

station

can

be

assigned

an

IP

address

from

the

Ethernet

router

through

the

regular

DHCP

or

other

standard

Ethernet

methods.

Further,

each

wireless

camera

in

the

network

behaves

like

a

regular

IP

camera

to

any

existing

client

or

application

on

the

LAN.

In

this

way,

each

wireless

camera

can

be

addressable

through

industry

standard

APIs

so

that

each

video

stream

and

each

wireless

camera

can be

viewed,

recorded,

and

manipulated

individually

without

any

modi?cations

to

existing

applica

tions

and

hardware.

The

wireless

network

camera

systems

described

herein

can

be

used

in

numerous

applications,

such

as

alarm

veri?cation

and

surveillance

applications

for

constructions

sites,

mobile

transportation,

and

border

patrol.

Construction

Sites

Construction

theft

is

widespread

and

nothing

new,

but

the

amount

of

theft

is

increasing.

Construction

thefts,

which

are

rarely

solved,

can

lead

to

construction

delay,

higher

costs

and

insurance

rates,

and

higher

home

prices.

The

National

Asso

ciation

of

Home

Builders

estimates

that

the

construction

theft

problem

costs

the

US

building

industry

$4

billion

annually

and

increases the

cost

of

the

average

home

by

1.5

percent.

Some

builders

try

to

protect

themselves

by

using

bind

tools

and

materials

into

heavy

heaps

or

block

driveways.

Most

install

temporary

locks

on

windows

and

doors

and

wait

until

the

last

minute

to

install

appliances.

Installing

traditional

video

security

cameras

can be

dif?

cult

because

power

is

unlikely

to

be

available

at

the

location

best

served

by

the

video

camera.

Most

builders

are

unwilling

to

invest

the

dollars

for

a

temporary

installation.

In

addition,

cabling

for

a

network

camera

system can

be

impractical

at

the

construction

site.

The

wireless

network

camera

systems

described

herein

can

offer

a

solution

to

this

problem.

Wireless

cameras

can be

quickly

added

and

moved

during

the

con

struction

phase,

and

theft

activity

can

be

identi?ed

in

real

time.

Since

the

cameras

are

temporary,

the

builder

can

re-use

the

cameras

at

other

new

construction

site,

decreasing

the

initial

investment

for

a

total

security

system

to

cover

all

construction

projects.

Mobile

Transportation

Without

proper

measures,

public

transit

vehicles,

school

buses,

light

rail

cars,

and

trains

can be

affected

by

security

issues

involving

passengers

and

operators.

Problems

such

as

vandalism,

assault

and

even

suspicious

liability

claims

can

affect

or

disrupt

an

operation.

While

there

are

mobile

surveil

lance

systems,

they

require

an

on-board

DVR

which

can

be

cumbersome

and

dif?cult

to

retro?t

into

an

existing

transpor

tation

vehicle.

In

addition,

the

existing

system

may

not

pro

vide

real-time

information

to

a

central

monitoring

station.

The

wireless

network

camera

systems

described

herein

can

alleviate

this

problem

with

a

low

installation

cost,

and

very

little

additional

equipment

to

install.

With

protected

dome

cameras

at

multiple

locations

on

the

transportation

vehicle,

a

broad

coverage

can

be

enabled,

while

providing

an

avenue

for

central

monitoring

through

a

3G

IP

based

data

network.

The

base

station

can

store

images

temporarily

should

an

interruption

occur

through

the

3G

net

work

preventing

immediately

transfer

of

images.

With

the

temporary

storage

at

the

base

station,

a

near

real-time

video

security

monitoring

can

still

be

obtained

with

a

very

cost

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