TW548969B - Multiplexed wireless pan and tilt camera array - Google Patents

Abstract

A system of multiplexed, wireless, battery powered video cameras and an RF video receiver, video digitizer, de-multiplexer and video compressor is disclosed. Also disclosed is a design for reducing the effects of fluorescent lighting flicker on motion sensitive video compression algorithms such as MPEG. Also disclosed is a design for a remote controlled electro-mechanical pan and tilt mechanism with a single moving part per axis that allows precise positioning and variable slow rate.

Description

V. Description of the invention q = Ming is the result of multiple image capture in a 1-channel environment and remote viewing on the Internet. In particular, the present invention relates to:;, ... line: frequency (', radio frequency ,,) television channel multiplexed multiple cameras to 1-view, digital image decoder' digital image demultiplexer and digital image The image of the compression engine is transmitted wirelessly over a short distance. The invention also includes a design to reduce the effects of fluorescent flicker on video compression sub-metagrams such as MPEG. The invention also includes a remote electromechanical picture pan and tilt system to target the target camera. BACKGROUND OF THE INVENTION / _WCCTV) systems are commonly used in security and remote monitoring applications. These CCTV systems are usually analog systems, in which the camera analog images need to be transmitted on a dedicated coaxial cable from a distance. Many business and private users require multiple cameras to be viewed simultaneously from a specific location. The installation of multiple wired cameras requires significant effort in order to set up coaxial image cables and power cables between the multiple cameras and the camera controller and display. Recently, the Internet has evolved to highly compressed digital images that can be transmitted from anywhere to anywhere in the world. Cameras and computers that can provide digital images to the Internet and the World Wide Web are commonly referred to as web cams ° Computers that include digital image converters, image compressors and network interface devices can replace traditional analog CCTV cameras Controller. When used in multiple camera applications, these systems still require the installation of a coaxial cable and power cable between the camera of the camera computer and the image digitizer. Multi-camera This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 548969 A7 ____ B7 V. Description of the invention (2) ^ A device wirelessly connected to the camera controller is required. Many wireless camera systems are currently available. These wireless camera systems use some restricted radio frequency bands approved by the FCC in the industrial scientific and medical radio frequency bands known as ISM. Unlicensed ISM bands are restricted to short distances (typically less than 丨 00 inches) and fairly low power levels by F C C regulations. Since analog video requires a large frequency of approximately 6 mHz per channel and the use of frequency modulation (FM) to reduce the impact of radio frequency noise, only 4 analog TV channels are actually used in the 2 4 GHz ISM band. In addition, the 4 separate receivers and decoders need to be used in an existing 4 channel system to allow 4 cameras to watch at the same time. Existing wireless systems will then be limited to only four wireless cameras in the 2.4 GHz ISM band. Some existing radio camera systems use standard XIO appliance controllers to allow multiple cameras to share the same RF channel. The only one of these cameras can be activated remotely each time on the X 10 home wiring agreement. The limitation of these systems is that one camera can be viewed at a time. An invention that allows access and instant viewing of more than 4 wireless cameras is needed. Most cameras use standard television system timing and signal levels such as the North American NTSC standard. The NTSC standard can transmit 30 frames per second and is composed of 60 interlaced image locations with odd and even image scanning linearly. At 30 frames per second, the TV image will show a smooth flow of movement due to the visual persistence of the human visual system. The latest developments in Internet communication technology are limiting the amount of available bandwidth that can be applied to moving images. For example, the help of JPEG and digital video compression technology of 3 ^ (3 can reduce the bandwidth limitation of the Internet to some extent, but

548969 V. Description of the invention (3, still typical on a standard computer with less than 30 μm frames per second with reduced resolution. The use of Internet imagery is a limited frame The rate is acceptable in most applications. Many current web cameras and web servers can send images at a rate of several seconds per frame, per frame, and mpeg compression depends in part on the detection of moving images and transmitted motion vectors, rather than the entire Video. The mpeg motion compression method is sensitive to the flickering light produced by most fluorescent light. The flickering light will waste the bandwidth of the MPEG mobile compression algorithm by interpreting the flashing light into movement.-Invention needs to be reduced or removed The impact of light on the MPEG motion-sensitive I reduction algorithm. Camera systems often include a _motor system to rotate and lift the camera, in order to adjust the field of view of the camera remotely. _ Camera shift is more commonly referred to as “screen shift and Tilt. Most of the existing day-to-day pan and tilt systems use electric motors and reduce gears-a complicated, high-cost system to reduce high-speed electric motors to day-to-day pan and tilt photography Low speed required by the camera. Typically, the camera components are installed in the-pan and tilt base unit, and the entire camera can be translated and tilted in the day and time. Existing gear electric motor systems will also encounter incorrect positioning due to known binding The gear sequence is slow. An invention is needed to provide a simpler, lower cost and more accurate camera positioning: device. SUMMARY OF THE INVENTION In one aspect, the invention features a battery-powered wireless imaging camera system, which Including multiple wireless image cameras to support electrical mechanical picture pan and tilt functions and a light compensation subsystem. The specific embodiments of the present invention have one or more of the following advantages. This paper standard is applicable to China National Standard (CNS) A4 specifications (210X297 public love) V. Description of the invention (The serial number is transmitted to the analog multiplexer crying. Finally, the multiplexer of the μμ Zhong AU can output the digital serial number: 22 frequency transmitter. The microprocessor clock is related to The camera chip is synchronized with the pulses to allow it to transmit serial numbers within the time line of the image scan.-/ Concentrator can be analogized Like radio frequency FM receivers receive analog video signals, while continuous analog video streams are sequenced from video fields from multiple cameras. The modulation method of analog video transmission allows radio frequency! ^ Receiving σσ can be re-transmitted The effect of varying signal strength on a radio frequency channel is shared by the transmitter time. The output level of the radio frequency receiver is a function of the frequency deviation transmitted by the FM analog image transmitter in each camera. The intensity of the change in the number L of the distance between the concentrators of the concentrator. The analog scene image can be decoded by an analog image decoder chip such as the Philips s AA 7 1 丨 image decoder, which can convert the analog image Converted into a digital image stream, wherein the digital image stream can be captured and stored in a memory included in the receiver as a concentrator. The microprocessor at the receiver concentrator can read the last scanned line of each capture field to retrieve the camera serial number. The microprocessor uses the serial number to demultiplex the video field into individual buffers associated with each camera. The microprocessor in the receiver concentrator can then digitally compress each camera's image buffer with software image compression or an image compression chip. Industry standard digital image compression techniques such as JPEG, JPEG2000, MPEG1, MPEG2 or MPEG4 can be used. This method allows an early image decoding chip and a car compression resource to be shared by multiple cameras. The receiver concentrator can be programmed to use the standard paper (CNS) A4 (210X297 mm) ^ 48969, invention description (6 included a network control device standard TCP) The / IP protocol sends a compressed image stream from each camera to the requested Internet client. Each Internet client can only receive compressed images from the camera or some cameras requested by the client. The microprocessor can modify each video image% from each camera to add a digital watermark and / or pattern and / or copyright and / or

Time recording, which allows clients to record and / or identify the origin and ownership of each image sequence. Digital watermarks and / or patterns can also be used to avoid or prevent illegal use of video images. Hold

The RF FM transmitter of each camera can also send a confirmation signal back to the receiver concentrator in response to a special reverse channel command. The data communication on the image RF FM transmitter from the camera to the receiver concentrator can be regarded as the forward frequency. The microprocessor in the camera can insert the command obtained from the sensor and / or switch and / or the low-speed analog _ digital converter into the same image scan line used to encode the camera serial number as described in the second patent application scope. Confirmation code and / or camera status and / or information. The camera's microprocessor can use some or all of the image scanning lines to transmit high-bandwidth digital lean to the receiver concentrator. High-bandwidth data can be obtained from the camera's analog-to-digital converter, to digitize deaf data from the camera microphone, or from external devices connected to the camera, such as joysticks and / or position sensors and / or Medical instruments. The camera can be programmed to transmit a mix of low and south bandwidth digital data and analog images during different 4-slot periods. Allowable area and distance of forward channel as described in patent application scope item 6 and 7

V. Description of the invention (7 b. · Ancestral road 'to isolate _ special camera system problems and special problems of the camera. The microprocessor of the camera can be program-controlled to generate-simple image test pattern' in order to isolate a camera image from the problem of camera communication Sensor chip problem. The light emitting diode (LEDS) of the camera can be activated by a command from the reverse frequency transport and _ 'to alert the user if the camera's camera is moving or failing. You can press the button on the camera to know Test the camera and receiver concentrator, and know the user's relevant system status through LEDSit. The buttons on the camera can be used to alert an area or remote operator or program to the user's needs and / or emergencies. / Camera's The audible warning device can be achieved by area or network control to get the attention of anyone near the camera. The thermal sensor, smoke sensor, water leak sensor, temperature sensor cut in the camera And / or mobile sensors may be used to notify users of areas and / or networks that are remote, or to program security-related and / or security-related events. The time-consuming and multiplexed nature of the design can be caused during a low duty cycle of most camera components. The camera's image sensor and RF transmitter are turned off most of the time. The camera's microprocessor can be located between the main gap pass wheels Turn off all unnecessary resources. The microprocessor can support low-power sleep mode and can be programmed into a low-power sleep mode between time slot transmissions. It can wake up the microprocessor's resources and wake up the receiver concentrator. Command, or ended with, for example, a zone event input from a zone sensor, where the zone sensor includes a heat sensor, a smoke sensor, a water leak sensor, and / Or motion sensor. These features allow the camera to be selectively powered by a battery for a long time. 548969 A7 B7 V. Description of the invention (8) A picture pan and tilt system uses a long radius indicator ring or ring segment. A modified Sawyer-type linear motor implementation in which the ring segments can move a first surface mirror mounted above the camera lens. 2 Move a light-weight mirror without The entire camera allows lower control power and lower moonlight requirements. This system's low-energy property is compatible with battery power. The radius indicator ring can amplify the motor torque, and also allows fine fine movement of the camera's field of view. The upside-down image caused by a mirror can be compensated on the camera sensor chip by stylizing it, where the programming can reverse the image scanning sequence from normal left to right. The Sawyer motor is implemented using a small permanent magnet, It also provides zero power retention. The full-screen pan and tilt system can be implemented using two moving parts, where these moving parts can be implemented using low-cost plastic molded parts and ferrous metal indicator ring sections. The camera's microprocessor It can receive day-to-day pan and tilt commands from the receiver concentrator and convert these commands into intensive motor control signals for the four coils in the modified Sawyer motor. Acceleration and deceleration contours can be implemented in microprocessor software to provide smooth and precise camera positioning. A system reduces the effects of light changes caused by fluorescence. The light output from the fluorescent light can be changed at 120 Hz according to the 60 Hz AC timing sequence of the national power transmission grid. NTSC image timing uses a frame rate of 59.97 Hz. Modifying the image timing to exactly 60 Hz frame rate will reduce the time to change the image intensity with different frames to hours, not minutes. When using a temporary compression method such as MPEG ', the reduction in digital frame compression will be improved by reducing the variation with different frame intensities. The light-emitting diode light sensor of the camera can be read by the microprocessor of the camera _-11-This paper size applies to China National Standard (CNS) A4 specification (210X297 public love) 548969

Take 'to determine the change in ambient light intensity caused by fluorescence. The change in light intensity can be analyzed in 16 micro-cycles to determine the time point where the light level is most stable. The camera system can adjust the timing of the video frame and the electronic shutter to match most stable light output during the 16 microsecond frame capture. The combination of a method and a method such as item 14 of the scope of patent application can reduce the intensity variation caused by different frames due to fluorescence. When using a temporary compression method such as MPEG, reducing the change in frame intensity with different frames will improve the digital image compression ratio. Details of one or more specific embodiments of the present invention will be described in the accompanying drawings and the following. Other features, objects, and advantages of the present invention can be understood from the description and drawings and the scope of patent application. Brief Description of the Drawings Figure 1 is a block diagram of a multiplex wireless day-to-day pan and tilt camera. Figure 2 is a block diagram of a concentrator. Fig. 3 is a multiplexing diagram of the basic analogical panning and tilting of the multiplexed wireless picture panning and tilting camera of Fig. 1. FIG. 4 is a block diagram of a day-to-day pan and tilt mechanism used in the multiplex wireless day-to-day pan and tilt camera of FIG. FIG. 5 is a block diagram of a day-to-day translation and tilt linear motion operation of the multiplex wireless day-to-day translation and tilt camera of FIG. 1. FIG. Similar reference symbols in the various figures represent the same symbolic element. Detailed description of the drawings «Monthly, refer to Fig. 1. The hotline screen pan and tilt camera array J 〇 includes-complementary metal oxide semiconductor (CM0s) sensor camera Η. CMOS sensor camera 12 can output analog NTSC image to uhg TV

V. Description of the invention (1Q transmitter, modulator transmitter 14. The transmitter 14 can be controlled by the microcontroller 16 so that the two are transmitted during the time slot commanded by the -concentrator 26. The microcontroller 16 can be transmitted via = 3 MHz. OK (〇n 〇ff keying) The receiver receives the image synchronization pulse and time slot command. The timing logic block 18 can track the camera line and frame timing, and can also be synchronized by the transmission synchronization pulse from the concentrator 26. Unit serial number block 20 is a continuous memory device that contains a -64 bit unique serial number assigned to each manufacturing camera 10. The microcontroller 16 can read the serial number from the concentrator 26 to determine the special address to which it must respond. Source, system and battery monitor block 22 contains the power supply and an analog battery level monitor, which can be read periodically by the microcontroller 16 to determine the condition of the battery. This block 22 also contains a power switch to allow control CM〇s sensor 12, OK receiver, and the power of the data acquisition block. PTZ motor control block 24 contains a linear motor motor drive circuit, which is used to control the screen pan and tilt, and can control The servo-ma / -σ data acquisition block of the zoom lens contains a single-bit analog-to-digital converter, and uses the clock synchronization rate of the image clock to clock the clock. The output of this converter can be stored in memory for Later, one or more gaps can be transmitted at a higher synchronization rate. Please refer to FIG. 2 (Figure υ Concentrator 26 includes-a high performance reduced instruction set computer (RISC) processor 30. This processor 30 may Real-time digital images captured from digital NTS (: decoder 32) are processed through FPGA data formatter 34 and 512X32 FIFO 36. The RISC processor M is combined with 512 × 32 SDRAM memory 38, flash memory 40, and MpEG / jpEG code 548969 11 V. Description of the invention (㈣ Connected. 0〇κ transmitter "Yes ... 〇 Can send camera synchronization command and time slot configuration command to multiple shots One of these selection blocks is ... 46. Li, m ^ 100bTEnet network interface, which allows the concentrator 26 to send digital images to the Internet .: Since referring to Figure 3, it is based on (the array of Figure 10 is more similar than the cut-off time. Work and basic analogy to work more hours. In! Seconds During the interblock period, the frame is set to the active camera. Each frame corresponds to two NTSC image formats = 4 stomach maps ~ time. The duration and number of blocks allocated to each time slot are determined by A system. Different time blocks and different numbers of fields per time slot can be used to meet the systemic requirements. Please refer to FIG. 4-the picture pan and tilt mechanism includes a day-to-plane pan indicator ring 60, which is connected to A mirror device 60 and a tilting pivot 62 can be driven at 180 degrees. The tilting pivot 62 is a modified Sawyer linear motor implemented by a 30-degree motor. ι80 degree base and 30 degree rotation axis can be from 0 to 36. Any combination of operating degrees. This system has only 2 moving parts, and the spectrometer can be changed by changing the indicator ring 60 or the angle of the oblique square axis for different torque or precise positioning requirements. Please refer to Fig. 5. The day-to-day translation and tilt linear motor operator includes 4 feet of permanent magnets 80 and two sets of windings, so that different current directions can reduce the magnetic flux of one foot and strengthen the other leg. Magnetic flux. The two coils can be driven alternately using forward current. The reverse current or no current according to the current direction is indicated by an arrow. Analog framing and multiplexing wireless image The present invention allows multiple wireless cameras to share a single radio video channel. -14-This paper size applies to China National Standard (CNS) A4 (210X 297 mm) 548969 A7 B7

This radio video card can be viewed simultaneously using the original continuous frame nature of the NTSC television standard. The present invention can share NTSc * between multiple cameras like a single RF channel with a field rate of 60 fields per second, instead of having a limited number of entire bandwidth television channels per frequency = one camera. —Actually an unlimited number of wireless cameras can be accessed and controlled in a way that the active cameras are expected to =, total = field-restricted ^ The moving camera can use the one-stroke multiplexing method of 60 fields per second of NTSC signals Effective multi-tasking. Each active camera can activate its transmitter at a pre-programmed point corresponding to the number of special fields in the NTSC image signal. Dynamic camera selection and frame rate The camera-controlled scheduling software can determine which camera is accessible and the field rate. Camera selection and field rate can be dynamically adjusted based on real-time events such as motion detection or user viewing requirements. Wireless digital synchronization and reverse channel control A device to synchronize the wireless cameras is needed, so each camera knows what to do to launch the dagger in order to insert the field or frame into the reverse F τ τ c image sequence. This synchronization can be achieved by using a low-speed digital wireless link between the camera controller and all cameras. This digital wireless control channel is called a reverse channel. The camera controller has a simple Qn 0 ^ keyed (οοκ) transmitter. Each camera has a simple κκ radio frequency receiver to receive synchronization and control information transmitted by the camera controller. Each camera also has a unique digital serial number to allow the camera to be individually addressed and programmed via a special RF slot or some RF slot in the slot where the video frame must be transmitted. Reverse channels can be used for the following functions:

/ From 丨 Division 丨 Brother: ¾ Send the field slot command to each camera, and send the body update to the micro-position of each camera. It is communicated to each of the CMOS sensors in each camera. Command and fixation = Position information is transmitted to the "flat-tilt system" in each video frequency. • Diagnostic commands are given to _machines, called _ questions or failures x Controlled by other external resources in the camera, such as LEDs. The indicator light or infrared LED senses the lighting. ', All cameras need to use their slot sequence via reverse channels. # 机 控制 5 can transmit a continuous stream of sync pulses that can be received by all cameras. The Isochronous pulses can be used on each camera to establish a field zero reference point. The cameras can then activate their video transmitters during their relatively pre-programmed field slot times @. In this way, a series of fields can be used by the cameras Array broadcasting, so that the TV radio frequency reception in the camera controller can see a composite signal caused by multiple fields transmitted by the camera array. Image AM transmission broadcast television is on a variety of radios The frequency band uses AM with 6 MHz channel spacing (AM). AM image transmission is affected by the received signal strength swing sensitivity and, for example, auto-ignition or random noise sensitivity of electric motors. The advantage of AM transmission is a slightly simpler transmitter, which Only a 6 MHz bandwidth configuration and the available receivers used in televisions and video recorders are required. When using MWC FM to transmit images, the receiver must always produce the same image __ · 16-This paper standard applies to China National Standard (CNS) A4 specification (210X297 public love) 548969 A7 B7 V. Description of the invention (14) Image output level, so that when different cameras turn on and off their transmitters, it will not cause a discontinuous signal. All TV receivers include RF automatic gain control, which adjusts the RF receiver gain to compensate for changes in received signal strength. These automatic gain control circuits typically require microseconds to adjust for sharp changes in RF strength. This automatic gain function is typically too Slow, without allowing the receiver to adjust the different transmitters of the MWC. Image receiver gain compensation camera The controller's TV RF receiver can see different RF signal strengths of each camera due to the different distances between individual cameras and TV receivers. To compensate for changing RF signals between cameras, the camera controller will Adjust the gain setting of the TV receiver on a time slot-by-time slot basis. During the initial system startup of the camera controller, a camera calibration process measures the strength of the RF signal received from each camera, and calculates that the received signal of each camera is normal A corresponding receiver gain setting of the Institute. When each camera transmits a field during its time slot, the camera controller can use the pre-calculated gain setting of the active camera to allow the receiver to output a fixed amplitude related to other cameras Signal. Frequency modulation of the image. Most existing wireless camera systems use frequency modulation (FM). The advantage of FM is that it is relatively unaffected by changes in signal strength and random noise. The disadvantage of FM image transmission is a slightly more complex transmitter that requires a custom-designed receiver and its larger bandwidth requirement of about 15 MHz. Most currently available wireless camera systems use FM image modulation with a 3 MHz carrier offset and 15 MHz channel spacing. As a result, there are 2 available channels in the 900 MHz ISM band and in 2.4 -17-This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 548969 A7 -------- B7 V. Invention Note The (15) GHz ISM band has 4 channels. The use of MWC's FM video transmission can result in more accurate video signal levels in the receiver output. When different cameras are turned on and off, this can substantially reduce the non-U & image > f§ 纟. When switching between cameras, the video decoder must see the consistency mask level and sync signal level. FM in mwc can provide a more robust and low noise transmission system, and can be better implemented. Transmitter Switching Timing MWC camera can be fast-tracked 'and when the camera turns off its transmitter and another camera is started, the time point must be carefully selected to reduce adverse effects. When the M WC camera is turned on and off, the image receiver can see the transient state of receiving the radio frequency signal. However, this transient is a very short time of a few microseconds and can be interpreted as a malfunction of the received signal during the transition point between cameras. The switching point can be carefully matched to the time similar to when the video player can change the video head during the middle of the last line of a field during the playback time. At this point in the picture field, it can be ensured that the transient state will not occur, and the set time can be allowed to be large between the vertical synchronization parts of the next picture field. Image decoding and demultiplexing

In the concentrator, the video stream can be received by the receiver / tuner and converted into a digital video stream in the NTSC decoder. This stream is a composite on the frame of all active cameras from the MWC array. Software execution in the concentrator's RISC processor demultiplexes the frame sequence based on the priority configuration time slot. Common MPEG Encoder -18-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 548969

Income ~ It is multiplexed into individual image buffer states of each active camera. These individual image buffers can be processed by an MPEG / JPEG encoder to generate individual compressed image streams, which can then be transmitted to the Internet. Each compressed video stream can be passed to one or more clients on the Internet. In this way, -MPEG / JPEG encoder resources can be shared among all active cameras. Fluorescence compensation Fluorescence guide can be provided by 60 Hz AC, and can make the light flash butterfly at 120 Hz. National grid electricity is typically at a very correct frequency. When combined with a glare of 60 Hz to generate a beat frequency of 100 Hz corresponding to a 33-second period, the NTSC color TV timing has a frame rate of 59.97 Hz. As long as every 33 seconds, the camera output can change slowly from light to dark. ㈣Brightness changes will cause unnecessary image coding and waste of Internet bandwidth, and make MpEG temporarily compress and degenerate the method to waste frequency. It can be interpreted as moving moving light. Yingguangbu 4 Baylor System uses a 3-part strategy to improve the M p E G compression ratio. 1. Synchronize the camera timing and camera controller timing with the local power frequency. Adjust the timing of the camera's electronic shutter related to the synchronous power cycle to match the most stable light output of the fluorescent light. 2. Use a light-emitting diode in each camera to determine the most appropriate electronic shutter speed for each camera. 3 • Use a calibrated white target in the field of view of each camera to normalize the contrast and brightness of each frame. These techniques can be used individually or in combination to reduce the effect of changing the intensity of the fluorescence. __-19-I Paper Size Applicable Standards (CNS) A4 Specification (21Q X 297 public reply 548969 A7 B7 V. Description of the invention (17 Most of the existing day-to-day translation and tilting systems are installed on the system) A geared motor that can move the entire camera weighing several kilograms. The new system uses a two-part implementation, a large radius, and a modified Sawyer linear motor to move a mirror in a horizontal and vertical plane on a fixed camera. Sawyer linear motor is actually a linear stepping motor. The new system can use a pivot point on the vertex of the wedge to implement a modified wedge-shaped linear motor. The radius can be selected to achieve the required torque and step resolution. The holder can be implemented using a permanent magnet with 4 teeth and 2 drive coils. The mobile Pie wedge is made of low-cost lightweight plastic and a tooth-shaped ferromagnetic material near the edge of the Pie wedge. Made of long strips. Two wedges mounted at 90 degrees to each other and a first surface mirror on a fixed camera can implement an entire day-to-day pan and tilt system. This system has The following features: • Very low cost • Low quality for fast acceleration • High precision stepping • Variable rotation rate • Low driving energy requirements • No need to maintain the required power data transmission MWC RF image transmitter design can transmit NTSc analog images . MWC must be directed to the shell channel to communicate the camera status and confirm certain commands. The RF image transmitter can be used as a data transmitter in these cases. There are three types of data that can be transmitted on the RF image transmitter. • 20-

548969 A7 B7 V. Description of the invention (18) 1. Analog NTSC image data 2. Digital camera status and command confirmation 3. Digital delta sigma PWM encoding analog data In all cases, the normal NTSC frame timing and level are required. Camera status and digital signals can be transmitted using analog images as media. This allows centralized NTSC decoders to process the camera status and digital information as normal images. De e 11 a S i g m a Analog data acquisition MWC can be used to provide analog multiplexing signals from sources other than video cameras. For example, temperature, battery voltage, mechanical positioning and pulsation, and low-frequency analog signals with low-quality audio can be transmitted using the same technology. 0 A simple single-bit analog-to-digital converter technology can encode one heart. (PWM) output. The converter's acquisition clock is synchronized with the timing of the image—lower rate synchronization. The synchronous PWM stream can be stored in the first-in-first-out (FIF) memory 'and then read back at a higher rate, and can be transmitted like an analog video frame, but with a pwM stream modulated video signal. The ratio of the catch-up clock timing to the transmission clock timing can be achieved at the correct rate required to transmit real-time data in f video time slots. As shown in the two examples, if the program for catching the clock is 1GGKHz m system, this time slot is used to communicate with this data, and if the number of time slots per block is 1 5 ', then the transmission clock will be! Thirsty KHz. In this way,-continuous analogue materials can be time-multiplexed using the same timing as normal frame. On the concentrator side, the IRSC processor can receive time-compressed pwM streams

548969 A7 B7 5 Invention description (19) and it can be converted to instant by using the same 150Hz clock playback for catching it. The bandwidth of this method is limited to low-quality audio or low-speed analog events. Many specific embodiments of the invention have been described. It will be understood, however, that various modifications may be made without departing from the spirit and scope of the invention. Therefore, other specific embodiments are within the scope of the following patent applications. -22-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

548969 Δ Q No. 090124698 Patent Application B8 Chinese Patent Application Scope Replacement (April 1992) S VI. Patent Application Scope 1. A battery-powered wireless imaging camera system, which includes: a frame synchronization synchronization analog time division of labor Multiplex radio transmission specification, which is used to support multiple wireless video cameras with integrated electro-mechanical picture pan and tilt functions; and a main frequency synchronous lighting compensation subsystem. 2. The system according to item 1 of the scope of patent application, wherein the device is capable of supporting a wireless video camera, the device includes: a central camera receiver concentrator, and a low-bandwidth, low-power transmitter to communicate with the Multiple wireless camera synchronization. 3. The system according to item 2 of the patent application, wherein the central camera receiver concentrator comprises: an amplitude shift keying (ASK) device for transmitting commands to the multiple wireless cameras. 4. The system according to item 3 of the patent application, wherein the commands include: digital synchronization; time slot; screen pan and tilt; and zoom. 5. If the system of the scope of patent application is applied for item 3, the cameras can be individually addressed. 0. If the system of the scope of patent application is applied for item 3, the cameras can be addressed in a group. 7. The system according to item 1 of the scope of patent application, wherein the cameras include: a camera chip imager, such as Omnivision OV7910 analog photography. This paper applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 548969 A8. B8 ～ 7 萦 The patent application scope of the machine chip, and CPLD logic and timing chip can make the camera chip image timing synchronization; a microprocessor and an ASK receiver to form the interface, timing logic, power control and battery monitor, a sensor, And RF modulator, unit serial number and multiplexer; and a concentrator. 8 · If the system of item 7 of the scope of patent application, the unit serial number contains: a 48-bit electronic serial number, which can only identify these cameras. 9. The system according to item 7 of the patent application, wherein the unit serial number is coded in a final image line of each field. 10. The system according to item 7 of the scope of patent application, wherein the multiplexer is configured to process the analog image from a camera chip and a digital serial number generated by a microprocessor during the last image scanning line of each field. Between changes. U · The system called item 7 of the patent fan garden, where a switch control of the multiplexer can be controlled by a compound programmable logic device (CPLD), such as ZiHnx XCR3128, and the CPLD can track the timing of the camera chip image . 12_ The system according to item 11 of the patent application, wherein the switch control can interrupt the microprocessor so that the microprocessor can transmit the unit serial number to the multiplexer in a one-bit continuous manner, and the multiplexer can The serial number is output to the RF modulator. 13. The system as claimed in item 7 of the patent scope, wherein the clock of the microprocessor is sufficient to read the camera chip, such as omnivisi〇n OV7910, and the LD clock to synchronize the time of an image scanning line Send the order 548969 6. Scope of Patent Application Yuan No. 14. If the system of scope 7 of patent application is applied, the order will be a compressed video client from multiple cameras. Read and transfer to—required internet 15. The system for item 4 of the patent application, which enables TCP / IP transmission. ', ^ Can be program-controlled to compress the image. 16. For example, the system under the scope of patent application No. 7, ^ ^. A ^ Concentrator includes a device to modify the field from the parent camera To add additional information. μ The system for which the scope of the patent application is No. 16, in which the additional information is-digital for watermarking 18. If the system for the scope of the patent application No. 16, ^ the extra information is the case. 19. If you apply for the system of item 6 of the patent scope, T, and M, the information outside the M neck is the right. 20. The system of claim 16 wherein the additional information is a record. 21 • The system according to item 7 of the patent application, wherein the RF modulator can confirm that the signal is transmitted back to the concentrator. 22. If the system of item 7 is applied for, the processor can scan the lines using the image in order to transmit the high-frequency digital information to the concentrator. 23. If the system of claim 7 is applied for, the camera may further include: an audible warning device whose incentive can get the user's attention. 24 If the system of claim 23 of the patent scope, the auditory warning device package Figure Time «Pack -3- This paper size applies to China National Standard (CNS) A4 specifications (210X297 public director) 548969 Includes: A device used to detect an stimulus. 25. The system of claim 23, wherein the incentive is heat. 26. The system of claim 23, wherein the incentive is smoke. 27. The system of claim 23, wherein the incentive is a water leak. 28. The system according to item 23 of the patent application, wherein the excitation is temperature. 29. The system of claim 23, wherein the incentive is exercise. 30. The system according to item 1 of the patent application scope further includes: a screen pan and tilt system. 31. The system of claim 30, wherein the picture pan and tilt system includes: a modified Sawyer linear motor that can be operated on a long radius indicator ring or ring segment to place a camera lens A first surface mirror mounted on the moving. This paper size applies to China National Standard (CNS) A4 (210X 297 mm)