Multiple video camera surveillance system
First Claim
1. A video surveillance system comprising a plurality of video cameras (C1, C2, . . . , Ci) as well as a video signal switch (MUX)including a plurality of inputs (CV1, CV2, . . . , CVi) and at least one output (MO), a means (SC) for controlling the video signal switch (MUX) and said video cameras (C1, C2, . . . , Ci), a video signal recording means (VR) connected to said output (MO) of said video signal switch (MUX);
- each of said video cameras (C1, C2, . . . , Ci) comprising;
an image converter means (CCD) for receiving said images and converting them into an image signal having at least a luminance component, a pulse generating means (TC) for free-running generation of a sequence of horizontal and vertical synchronization pulses, whereby the period (PS) of said sequence may deviate from a predefined nominal period within a given tolerance interval (TI);
a means (SP) for combining said image signal from said image converter means (CCD) and said sequence of horizontal and vertical synchronization pulses into a composite video signal;
said pulse generating means (TC) being configured to assume a predefined starting status on receiving an external reset pulse (R) and to generate the sequence of said horizontal and vertical synchronization pulses commencing with said predefined starting status;
said video signal switch (MUX) comprising means for applying said signal at a selected input of said video signal switch inputs (CV1, CV2, . . . , CVi) to said output of said video signal switch (MUX) in accordance with a selection control signal (MC);
said system controller (SC) comprising a clock generator (CLK, FD1, FD2) for generating a reset pulse for communicating it to said video cameras (C1, C2, . . . , Ci) in common;
said video signal recording means (VR) comprising a video signal decoding circuit for decoding said video signal furnished by said video signal switch (MUX) and which is configured to lock on to said horizontal synchronization pulses contained in said video signal so quickly that it is able to decode video signals comprising time distortions caused by said periods of said sequences generated by each camera deviating from said nominal period.
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Abstract
A video surveillance system comprises a plurality of video cameras (C1, C2, . . . , Ci) as well as a video signal switch (MUX), a means (SC) for controlling the video signal switch (MUX) and the video cameras (C1, C2, . . . , Ci) and a video signal recording means (VR). The video cameras (C1, C2, . . . , Ci) each comprise a pulse generating means (TC) for free-running generation of a sequence of horizontal and vertical synchronization pulses, and a means (SP) for combining the image and the sequence of horizontal and vertical synchronization pulses into a composite video signal. The pulse generating means (TC) assumes a predefined starting status on receiving an external reset pulse (R) and generates the sequence of the horizontal and vertical synchronization pulses commencing with the predefined starting status. The system controller (SC) comprises a clock generator (CLK, FD1, FD2) for generating a reset pulse for communicating it to the video cameras (C1, C2, . . . , Ci) in common. A video signal decoding circuit in the video signal recording means (VR) locks on to the horizontal synchronization pulses contained in the video signal so quickly that it is able to decode video signals comprising time distortions caused by the periods of the sequences generated by each camera deviating from the nominal period.
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Citations
30 Claims
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1. A video surveillance system comprising a plurality of video cameras (C1, C2, . . . , Ci) as well as a video signal switch (MUX)including a plurality of inputs (CV1, CV2, . . . , CVi) and at least one output (MO), a means (SC) for controlling the video signal switch (MUX) and said video cameras (C1, C2, . . . , Ci), a video signal recording means (VR) connected to said output (MO) of said video signal switch (MUX);
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each of said video cameras (C1, C2, . . . , Ci) comprising;
an image converter means (CCD) for receiving said images and converting them into an image signal having at least a luminance component, a pulse generating means (TC) for free-running generation of a sequence of horizontal and vertical synchronization pulses, whereby the period (PS) of said sequence may deviate from a predefined nominal period within a given tolerance interval (TI);
a means (SP) for combining said image signal from said image converter means (CCD) and said sequence of horizontal and vertical synchronization pulses into a composite video signal;
said pulse generating means (TC) being configured to assume a predefined starting status on receiving an external reset pulse (R) and to generate the sequence of said horizontal and vertical synchronization pulses commencing with said predefined starting status;
said video signal switch (MUX) comprising means for applying said signal at a selected input of said video signal switch inputs (CV1, CV2, . . . , CVi) to said output of said video signal switch (MUX) in accordance with a selection control signal (MC);
said system controller (SC) comprising a clock generator (CLK, FD1, FD2) for generating a reset pulse for communicating it to said video cameras (C1, C2, . . . , Ci) in common;
said video signal recording means (VR) comprising a video signal decoding circuit for decoding said video signal furnished by said video signal switch (MUX) and which is configured to lock on to said horizontal synchronization pulses contained in said video signal so quickly that it is able to decode video signals comprising time distortions caused by said periods of said sequences generated by each camera deviating from said nominal period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification