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System and method for communicating data in a video system

a video system and data communication technology, applied in the field of video surveillance systems, can solve the problems of inability to verify using these techniques, inability to pack variable speed command data, and limited utc protocols, so as to reduce the overall packet length and reduce the bit period. , the effect of longer transmission medium

Inactive Publication Date: 2010-01-21
SENSORMATIC ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly reduces command latency by 50%, allows for efficient simultaneous control of multiple axes, and enables high-speed data transfers, improving real-time controllability and simplifying the addition of new functions in video surveillance systems.

Problems solved by technology

However, verification using these techniques can be impossible when multiple messages are corrupted.
Both redundant and bi-directional UTC protocols have typically been limited to transmitting / receiving four bytes of data per vertical period of the video signal.
This command size restriction has made it impractical to pack variable speed command data for all axes of a video dome camera into a single transmission.
Wider pulses are not as easily degraded beyond usable limits due to rise and fall times, however wider pulses reduce the usable cable length because they reduce the margin between the end of a command word and the following horizontal sync pulse.
Reply data transmitted by the camera device is subject to the same cable related delays as the video signal.
Also, known systems have required complex repeater configurations for re-driving the video signal with embedded reply data from the video dome, while capturing, buffering and re-inserting the UTC data from the controller in the next vertical interval.
However, with the limited number of horizontal lines available for bi-directional communication during a single vertical blanking period, the single byte approach limits the total command size to half that available with 16-bit per horizontal schemes.
Another difficulty associated with conventional UTC protocols is that they render downloading large firmware updates through a series of 4-byte UTC commands impractical.
Most controllers do not provide enough spare function keys for future functions.
Using multiple key combinations is cumbersome due to the difficulty in memorizing the combinations.
Conventional UTC techniques are therefore inefficient in the transmission of control commands and data over a transmission medium to a video dome, switch, recorder, etc.
In fact, simple movement control of video dome-type devices has noticeable latency.
Also transmission of new software updates is slow enough to be deemed impractical, and adding control functions to an existing system is difficult.

Method used

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  • System and method for communicating data in a video system
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  • System and method for communicating data in a video system

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Embodiment Construction

[0030]The present invention will be described herein in connection with various exemplary embodiments thereof. It is to be understood that the embodiments described herein are presented by way of illustration, not of limitation. The present invention may be incorporated into a wide variety of systems requiring bi-directional communication over a transmission cable without departing from the spirit and scope of the invention. In addition, although coaxial cable has been the traditional medium of choice for transmitting analog video signals, those skilled in the art will recognize that other media such as twisted pair wire, fiber optic cable, etc. are becoming common choices. The present invention is not limited to any particular transmission medium. As such, a protocol consistent with the invention may be more properly described as an “Up-The-Cable” protocol to indicate its utility in connection with any type of transmission medium.

[0031]Turning now to FIG. 1, there is illustrated, i...

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Abstract

A system and method of controlling a video camera arranged to provide a video signal on a transmission medium including: transmitting command data on the video transmission medium to the camera, and receiving response data from the camera over the video transmission medium during a single vertical blanking period of the video signal, improving controllability of dome type cameras. Using an encoding format with data with bit widths narrower than those conventionally used in UTC protocols, increases the usable transmission medium length for the system by allowing for longer propagation delays without errors caused by interference. A method of downloading data to a camera by disabling the video signal, and a method of self-instantiating camera functions are also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 395,296 filed Mar. 24, 2003, now U.S. Pat. No. 7,573,500, entitled SYSTEM AND METHOD FOR COMMUNICATING DATA IN A VIDEO SYSTEM, the entire disclosure of which is hereby expressly incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to video surveillance systems employing remotely-controllable video cameras, and, more particularly, to a system and method for facilitating bi-directional communication between video cameras and video camera control equipment.BACKGROUND OF THE INVENTION[0003]Video surveillance systems are conventionally configured as closed-circuit systems wherein one or more video cameras controllably monitor selected areas of interest. The video cameras may transmit video signals over a cable to a control console at which the signals are switched, viewed on monitors, etc. The cable over which the video signals are ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/232H04N7/088H04N7/18
CPCH04N5/23203H04N7/185H04N7/181H04N7/088H04N23/66
Inventor BERKEY, THOMAS F.SCHIELTZ, STEVEN W.
Owner SENSORMATIC ELECTRONICS CORP