CN102497528A - Double twisted pairs-based monitoring system and method for transmitting and allocating RGBHV - Google Patents
Double twisted pairs-based monitoring system and method for transmitting and allocating RGBHV Download PDFInfo
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Abstract
The invention provides a double twisted pairs-based monitoring system and a method for transmitting and allocating an RGBHV. The system is characterized in that a test image generating circuit is connected to a plurality of difference video driving modules of a double-twisted-pair video array by double twisted pairs, and a video output port of an RGBHV array is connected with display terminals by coaxial cables. The benefits are as follows: the automatic loss and time lag adjusting method and system are adopted, the corresponding dynamic parameter compensation is conducted on a video input port switched at present at the video output port, and other video input ports of the array, which can not be displayed, do not need to be adjusted, so that the equipment number and cost can be reduced.
Description
Technical field
The present invention relates to the transmission distribution technique field of computer video; Be particularly related to a kind of computer video based on twisted-pair feeder (RGBHV (S)) transmission distribution system and method, the middle distance video information that is applied between multicomputer video front and multidisplay system is shared.
Background technology
Along with improving constantly of social informatization degree; The application demand that need implement the high-quality video monitoring in each field increases greatly; Realization is to large-capacity video information real-time, effectively transmission distribution; Thereby reach resource-sharing, for all levels of management personnel and the policymaker provides convenience, fast, effective service, be current China independent research video transmission supervisory control system and an urgent demand of technology.
Video baseband transmission technology can be divided into following three major types according to the medium of transmission video signal: coaxial cable, optical fiber, twisted-pair feeder.It is more cheap that coaxial cable has price; The technical characteristics such as realization that are easy to; It all is the common method of video transmission all the time; But exist to need many cable transmission one road videos, matrix complex connection when input and output are larger, reliability reduction, poor anti jamming capability, the shortcoming that loss is big; The optical fiber video signal transmission has transmission bandwidth broad, capacity and greatly, does not receive advantages such as external electromagnetic environmental interference, strong security and transmission quality are good; But because optical fiber integrally transmission system price is too high; Optical fibre installation, connection need Special Equipment; And the Installation and Debugging difficulty, defectives such as maintenance cost height are mainly used in the long-distance transmissions that surpasses more than 1000 meters.
Many advantages such as twisted-pair feeder transmission has that antijamming capability is strong, long transmission distance, wiring are easy, cheap became main method extensive, the middle distance video transmission in recent years.
Mostly the twisted-pair feeder transmission equipment is to the composite video type in the market; Be applied to the twisted-pair feeder transmission equipment negligible amounts of computer video; Because the adjacent lines of twisted-pair feeder length when making is different; Computer video can be different to the time lag that transmits each video component of back and arrive receiving terminal through the middle and long distance twisted-pair feeder, causes the corresponding color component red of each video component of receiving terminal, green, indigo plant not to overlap; The attenuation degree and the compensating parameter of the vision signal of different transmission ranges also have nothing in common with each other; It is smudgy that image becomes; Below either way can influence display quality and effect greatly, therefore, proofread and correct in the twisted-pair feeder transmission course and compensation is absolutely necessary.
Shown in accompanying drawing 1; Existing correction and the compensation method of taking based on the supervisory control system of twisted-pair feeder normally set up preemphasis circuit separately on each road of video front of each dispersion; Before transmission in advance the high fdrequency component of amplifying signal to offset the transmission course loss, perhaps in advance to video component the branchs decalage when being equipped with each component of counteracting transmission course of delaying time.Twisted-pair feeder computer video matrix is only accomplished the passage handoff functionality; Because the computer video supervisory control system generally is to disperse input to concentrate export structure; And input port quantity M is generally much larger than output port quantity N; The equipment that causes the supervisory control system of this structure to be used for loss balancing and parameter adjustment disperse and quantity more, the adjustment of parameter normally is dispersed in the difference video driving module and manually accomplishes one by one, is difficult to quantification and standardization; Must be controlled by the professional, maintenance cost is high.
Summary of the invention
The objective of the invention is to propose a kind of twisted-pair feeder loss and time lag that in twisted-pair feeder computer video transmission dispensing applications, compensates different length automatically fast, carry out a kind of control system and the method for attenuation compensation and time lag correction at the output port of video matrix based on twisted-pair feeder transmission Distribution Calculation machine video.
A kind of supervisory control system based on twisted-pair feeder transmission Distribution Calculation machine video; Comprise that resolution chart produces circuit and is connected to a plurality of difference video driving module of twisted-pair feeder computer video matrix via twisted-pair feeder, the video output of twisted-pair feeder computer video matrix links to each other with each display terminal through coaxial cable.
Described twisted-pair feeder computer video matrix comprises: difference video matrix switch module, difference/single-ended change-over circuit, microcontroller, loss parameter acquisition circuit, time lag parameter acquisition circuit, attenuation compensation and time lag correcting circuit and parameter memory circuit.Microcontroller sends channel selecting and orders difference video matrix switch module, and difference video matrix switch module should be ordered mutually corresponding video inputs mouth is switched to video-out port; Difference/single-ended change-over circuit receives the output of difference video matrix switch module, and converts Difference Calculation machine video into single-ended computer video output; Attenuation compensation circuit and time lag correcting circuit receive the output of single-ended computer video and compensate and proofread and correct according to the parameter adjustment order of microcontroller; Attenuation compensation circuit and time lag correcting circuit are directly exported color component under normal mode of operation, and the output of the color component of attenuation compensation circuit and time lag correcting circuit is connected respectively to loss parameter acquisition circuit and time lag parameter acquisition circuit under the parameter measurement pattern; Loss parameter acquisition circuit is gathered the color parameter characteristic of color component, and the time lag parameter characteristic that time lag parameter acquisition circuit is gathered color component outputs to microcontroller; Under normal mode of operation; When microcontroller receives the switching of external communication interface order completion passage; Read the corresponding parameter and the output parameter adjustment of parameter memory circuit and order attenuation compensation circuit and time lag correcting circuit, the time lag parameter characteristic of the color parameter characteristic of microcontroller receive loss parameter acquisition circuit output and the output of time lag parameter acquisition circuit also stores the parameter the most consistent with the parameter characteristic of known resolution chart into the parameter memory circuit under the parameter measurement pattern.
Described difference video driving module comprises: resolution chart produces circuit, digital circuit/vision signal conversion, normal/test mode diverter switch and single-ended/difference video switch circuit.Resolution chart produces the resolution chart of circuit output TTL form to digital circuit/vision signal change-over circuit, and digital circuit/vision signal change-over circuit converts the resolution chart of the TTL form of input into video format; Normally/two inputs of test mode diverter switch are respectively digital circuit/vision signal change-over circuit and signal source output computer video; Under normal mode of operation; Normally/and test mode diverter switch reception signal source output computer video, normal/test mode diverter switch receives the output of digital circuit/vision signal change-over circuit under the parameter measurement pattern; Normally/output of test mode diverter switch is connected to single-ended/difference video switch circuit; Single-ended/difference video switch circuit converts the RGBHV video output of into difference video;
Shown in accompanying drawing 2; A kind of supervisory control system and method based on twisted-pair feeder transmission Distribution Calculation machine video; Promptly only the corresponding input video port of video-out port is carried out dynamic attenuation parametric compensation and time lag correction; And other to be switched video inputs mouths that do not show of matrix input are not adjusted, and reduce number of devices and cost; The method of dynamic parameter compensation is to transfer the corresponding compensating parameter of input port to be applied to compensation and time lag correcting circuit, and when the corresponding input of output video port changed, the compensating parameter of being transferred also dynamically changed.Because the present invention has reduced maintenance cost and debugging difficulty at the output centralized compensation of matrix; In addition; The present invention proposes to produce resolution chart transmission back by front end difference video driving module and contrasts at matrix video-out port collection graphic parameter and with the known signal characteristic; Realize the method for measuring fast, accurately of twisted-pair feeder loss and time lag compensation parameter; Need not artificial adjustment, improved calibration efficiency and accuracy.
In native system, have two kinds of mode of operations: first kind is the parameter measurement pattern, only when system buildup initialization and periodic maintenance, moves.Under this mode of operation, the difference video driving module produces the resolution chart of resolution chart such as accompanying drawing 3, and converts differential signal transmission into.In resolution chart, comprise and 100 nanoseconds, 1000 nanoseconds, 10 microseconds increase progressively rectangle calibrating signal up to 100 milliseconds; These signals can be represented in the vision signal characteristic of various frequency components from high to low preferably; Twisted-pair feeder computer video matrix carries out difference/single-ended conversion after accomplishing video switch; Each video inputs mouth of acquisition matrix is through the resolution chart signal of different length cable transmission, automatically with the contrast of resolution chart known features, analyze before the transmission with transmit after characteristics of signals whether consistent; Stepping increases the accurate compensating parameter of corresponding input channel when both are inconsistent; Comprise characteristic compensations such as gain, peak value, skew and time lag, the in full accord or basically identical until both characteristics, and general's compensating parameter at this moment deposits the parameter memory circuit of being made up of nonvolatile storage in.
Second kind of mode of operation is normal mode of operation.Computer video needs adjustment through two kinds of parameters are arranged after the twisted-pair feeder transmission: (1) various information source is inconsistent to the cable length of matrix, and the parametric compensations such as gain, peak value, skew that cause each road video inputs mouth are difference to some extent; (2) same signal source vision signal since the time delay difference that twisted-pair cable causes each color component video to arrive receiving port to length inconsistent can cause showing the time red, green, blue three looks do not overlap.To above two kinds of adjustment demands; The output port of the present invention after matrix switches is provided with attenuation compensation and time lag correcting circuit; When the different input video ports of upper computer selecting switch to the output video port; Adjustment parameter control attenuation compensation and time lag correcting circuit that the microcontroller dynamic call is corresponding to this input video port are accomplished a plurality of parameter adjustments such as gain, DC level, peak value and time lag.Because these parameters are optimal parameters of under the parameter measurement pattern, obtaining in advance; And resolution chart transmission the cable passage of process during with mode of operation normal video signal the cable passage of process identical; Its decay is also identical with time lag characteristic; The characteristic that these parameters are used for adjusting normal video signal also is to be suitable for fully, therefore can in tens of milliseconds time, make vision signal reach predetermined characteristic fast.
Described parameter measurement pattern and normal mode of operation; Be operated in the parameter measurement pattern when system buildup and initialization, comprise that step is following:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix all switch to test mode;
Step 102: shown in accompanying drawing 6, the resolution chart of difference video driving module produces circuit (601) and produces the resolution chart shown in accompanying drawing 3, comprises the pulse train from 100ns to the 100ms width, represents various from high to low frequency components in the vision signal; Resolution chart converts the resolution chart vision signal into through digital circuit/vision signal conversion (602), after normal/test mode diverter switch (603) and single-ended/difference video conversion circuit (604) convert the output of difference video into;
Step 103: shown in accompanying drawing 4, under the control of microcontroller (403), the difference video matrix switch module (401) of twisted-pair visual frequency matrix switch switches to first via video-out port with first via video inputs mouth;
Step 104: difference/single-ended change-over circuit (402) converts Difference Calculation machine video into color component (RGB) and synchronized component output (HV (S)) output, and this moment, attenuation compensation parameter and time lag correction parameter (406) all were set to 0;
Step 105: color component outputs to loss parameter acquisition circuit (404), and loss parameter acquisition circuit (404) is gathered through the vision signal after the transmission;
Step 106: microcontroller (403) reads output current color parameter, and with the resolution chart analysis contrast of Fig. 3, stepping increases the attenuation compensation parameter if current characteristic is different from resolution chart;
Step 107: repeating step 104 is to step 106, and the color parameter that reads up to microcontroller (403) reaches specified scope with the consistent perhaps error of characteristic of resolution chart, just this parameter is deposited in this input parameter district, road of parameter memory circuit (407);
Step 108: microcontroller (403) reads the time lag parameter of time lag parameter acquisition circuit (405) output; And calculate the corresponding time lag compensation parameter of each color component, and deposit this parameter this input parameter district, road of parameter memory circuit (407) in according to the characteristics of signals of resolution chart;
Step 109: under the control of microcontroller (403); The video inputs mouth switches to first via video-out port to difference video matrix switch module (401) up to the M road with the second the tunnel successively; Repeating step 104 is to step 108, obtains the attenuation compensation parameter and the time lag correction parameter of all video inputs mouths and is stored in the parameter memory circuit (407).
During except system buildup and initialization, system all is operated in normal mode of operation, comprises that step is following:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix all switch to the matrix operating state.Shown in accompanying drawing 6, signal source outputs to computer video through normal/test mode diverter switch (603) output, converts the output of difference video into through single-ended/difference video conversion circuit (604);
Step 202: shown in accompanying drawing 5; To video matrix switch module (501), video matrix switch module (501) switches to desired video-out port with the desired video inputs mouth of channel command to microcontroller (503) to outside switching command decoding back sendaisle control command;
Step 203: the difference video signal of differential received and attenuation compensation module (502) receiver, video matrix switch module (501) output;
Step 204: microcontroller (503) reads the corresponding attenuation compensation parameter control figure potentiometer (505) of this road video inputs mouth of parameter memory circuit (507), and digital regulation resistance (505) converts the input digit amount to analog quantity and outputs to differential received and attenuation compensation module (502);
Step 205: differential received and attenuation compensation module (502) are accomplished gain, peak value, migration to vision signal according to the decay control of digital regulation resistance (505) output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line (504);
Step 206: microcontroller (503) reads the corresponding time lag parameter control programmable analog video delay line (504) of this road video inputs mouth of parameter memory circuit (507), and each color component is overlapped because of time lag reaches consistent;
Step 207: repeating step 201 makes the video inputs mouth performance that each road output signal switches reach predetermined characteristic to step 206.
The beneficial effect of patent of the present invention is; (1) adopts the automatic loss of this patent proposition and the method and system that time lag is adjusted; Only the current video inputs mouth that is switched is carried out the corresponding dynamic parametric compensation at video-out port; And other to be switched video inputs mouths that do not show of matrix need not to adjust, and have reduced number of devices and cost; (2) producing resolution chart transmission back by front end difference video driving module contrasts at matrix output port collection graphic parameter and with the known signal characteristic; Microcontroller is analyzed the criterion as the control of flush bonding processor signal feedback to gathering content; Thereby realize the method for measuring fast, accurately of twisted-pair feeder loss and time lag compensation parameter; Realize the quantification and the standardization of calibration steps, the problem that solved that the efficient that manual adjustment method exists is low, low precision and subjective factor is big, improved calibration efficiency and accuracy.
Description of drawings
Fig. 1 is a twisted-pair visual frequency system for transmitting block diagram of the present invention.
Fig. 2 is a twisted-pair visual frequency system for transmitting block diagram of the present invention.
Fig. 3 is the oscillogram of resolution chart of the present invention.
Fig. 4 is the matrix composition diagram of twisted-pair visual frequency of the present invention.
Fig. 5 is twisted-pair visual frequency matrix embodiment of the present invention (matrix switches and the parametric compensation part).
Fig. 6 is difference video driving module embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the technical scheme of patent of the present invention is described.
System block diagram of the present invention is shown in accompanying drawing 2, and the difference video driving module also produces circuit by resolution chart and forms except that difference/single-ended change-over circuit, does not contain the preemphasis circuit shown in the accompanying drawing 1.The difference video driving module arrives twisted pair wire with the computer video signal code conversion for the differential signal rear drive; Attenuation compensation and time lag correcting circuit are arranged on the output port of video matrix, only the current video inputs mouth that is switched are carried out loss and time lag compensation.
The flow process of parameter measurement pattern is following:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix all switch to test mode;
Step 102: shown in accompanying drawing 6, the resolution chart of difference video driving module produces circuit (601) and produces the resolution chart shown in accompanying drawing 3, comprises the pulse train from 100ns to the 100ms width, represents various from high to low frequency components in the vision signal; Resolution chart converts the resolution chart vision signal into through digital circuit/vision signal conversion (602), after normal/test mode diverter switch (603) and single-ended/difference video conversion circuit (604) convert the output of difference video into;
Step 103: shown in accompanying drawing 4, under the control of microcontroller (403), the difference video matrix switch module (401) of twisted-pair visual frequency matrix switch switches to first via video-out port with first via video inputs mouth;
Step 104: difference/single-ended change-over circuit (402) converts Difference Calculation machine video into color component (RGB) and synchronized component output (HV (S)) output, and this moment, attenuation compensation parameter and time lag correction parameter (406) all were set to 0;
Step 105: color component outputs to loss parameter acquisition circuit (404), and loss parameter acquisition circuit (404) is gathered through the vision signal after the transmission;
Step 106: microcontroller (403) reads output current color parameter, and with the resolution chart analysis contrast of Fig. 3, stepping increases the attenuation compensation parameter if current characteristic is different from resolution chart;
Step 107: repeating step 104 is to step 106, and the color parameter that reads up to microcontroller (403) reaches specified scope with the consistent perhaps error of characteristic of resolution chart, just this parameter is deposited in this input parameter district, road of parameter memory circuit (407);
Step 108: microcontroller (403) reads the time lag parameter of time lag parameter acquisition circuit (405) output; And calculate the corresponding time lag compensation parameter of each color component, and deposit this parameter this input parameter district, road of parameter memory circuit (407) in according to the characteristics of signals of resolution chart;
Step 109: under the control of microcontroller (403); The video inputs mouth switches to first via video-out port to difference video matrix switch module (401) up to the M road with the second the tunnel successively; Repeating step 104 is to step 108, obtains the attenuation compensation parameter and the time lag correction parameter of all video inputs mouths and is stored in the parameter memory circuit (407).
The flow process of matrix mode of operation is following:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix all switch to the matrix operating state.Shown in accompanying drawing 6, signal source outputs to computer video through normal/test mode diverter switch (603) output, converts the output of difference video into through single-ended/difference video conversion circuit (604);
Step 202: shown in accompanying drawing 5; To video matrix switch module (501), video matrix switch module (501) switches to desired video-out port with the desired video inputs mouth of channel command to microcontroller (503) to outside switching command decoding back sendaisle control command;
Step 203: the difference video signal of differential received and attenuation compensation module (502) receiver, video matrix switch module (501) output;
Step 204: microcontroller (503) reads the corresponding attenuation compensation parameter control figure potentiometer (505) of this road video inputs mouth of parameter memory circuit (507), and digital regulation resistance (505) converts the input digit amount to analog quantity and outputs to differential received and attenuation compensation module (502);
Step 205: differential received and attenuation compensation module (502) are accomplished gain, peak value, migration to vision signal according to the decay control of digital regulation resistance (505) output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line (504);
Step 206: microcontroller (503) reads the corresponding time lag parameter control programmable analog video delay line (504) of this road video inputs mouth of parameter memory circuit (507), and each color component is overlapped because of time lag reaches consistent;
Step 207: repeating step 201 makes the video inputs mouth performance that each road output signal switches reach predetermined characteristic to step 206.
Claims (5)
1. supervisory control system based on twisted-pair feeder transmission Distribution Calculation machine video; It is characterized in that: comprise that resolution chart produces circuit and is connected to a plurality of difference video driving module of twisted-pair feeder computer video matrix via twisted-pair feeder, the video output of twisted-pair feeder computer video matrix links to each other with each display terminal through coaxial cable.
2. a kind of supervisory control system based on twisted-pair feeder transmission Distribution Calculation machine video according to claim 1, it is characterized in that: twisted-pair feeder computer video matrix comprises: difference video matrix switch module, difference/single-ended change-over circuit, microcontroller, loss parameter acquisition circuit, time lag parameter acquisition circuit, attenuation compensation and time lag correcting circuit and parameter memory circuit.
3. a kind of supervisory control system based on twisted-pair feeder transmission Distribution Calculation machine video according to claim 1, it is characterized in that: described difference video driving module comprises: resolution chart produces circuit, digital circuit/vision signal conversion, normal/test mode diverter switch and single-ended/difference video switch circuit.
4. a kind of monitoring implementation method according to claim 1 based on twisted-pair feeder transmission Distribution Calculation machine video; Through attenuation parameter compensation and time lag correcting circuit are arranged on video-out port; Only the corresponding input video port of video-out port is compensated and proofreaies and correct, reduce number of devices and cost; Through when system buildup and the initialization; The resolution chart transmission back that is produced by front end difference video driving module contrasts at matrix video-out port collection graphic parameter and with the known signal characteristic, realizes the measurement fast, accurately of twisted-pair feeder loss and time lag compensation parameter; When normal mode of operation, transfer the corresponding compensating parameter of parameter memory circuit input port and be applied to compensation and time lag correcting circuit, when the corresponding input of output video port changed, the compensating parameter of being transferred also dynamically changed.
5. a kind of monitoring implementation method based on twisted-pair feeder transmission Distribution Calculation machine video according to claim 4 comprises parameter measurement pattern and normal mode of operation; Be operated in the parameter measurement pattern when system buildup and initialization, comprise that step is following:
Step 101: front end difference video driving module and twisted-pair visual frequency matrix all switch to test mode;
Step 102: shown in accompanying drawing 6, the resolution chart of difference video driving module produces circuit (601) and produces the resolution chart shown in accompanying drawing 3, comprises the pulse train from 100ns to the 100ms width, represents various from high to low frequency components in the vision signal; Resolution chart converts the resolution chart vision signal into through digital circuit/vision signal conversion (602), after normal/test mode diverter switch (603) and single-ended/difference video conversion circuit (604) convert the output of difference video into;
Step 103: shown in accompanying drawing 4, under the control of microcontroller (403), the difference video matrix switch module (401) of twisted-pair visual frequency matrix switch switches to first via video-out port with first via video inputs mouth;
Step 104: difference/single-ended change-over circuit (402) converts Difference Calculation machine video into color component (RGB) and synchronized component output (HV (S)) output, and this moment, attenuation compensation parameter and time lag correction parameter (406) all were set to 0;
Step 105: color component outputs to loss parameter acquisition circuit (404), and loss parameter acquisition circuit (404) is gathered through the vision signal after the transmission;
Step 106: microcontroller (403) reads output current color parameter, and with the resolution chart analysis contrast of Fig. 3, stepping increases the attenuation compensation parameter if current characteristic is different from resolution chart;
Step 107: repeating step 104 is to step 106, and the color parameter that reads up to microcontroller (403) reaches specified scope with the consistent perhaps error of characteristic of resolution chart, just this parameter is deposited in this input parameter district, road of parameter memory circuit (407);
Step 108: microcontroller (403) reads the time lag parameter of time lag parameter acquisition circuit (405) output; And calculate the corresponding time lag compensation parameter of each color component, and deposit this parameter this input parameter district, road of parameter memory circuit (407) in according to the characteristics of signals of resolution chart;
Step 109: under the control of microcontroller (403); The video inputs mouth switches to first via video-out port to difference video matrix switch module (401) up to the M road with the second the tunnel successively; Repeating step 104 is to step 108, obtains the attenuation compensation parameter and the time lag correction parameter of all video inputs mouths and is stored in the parameter memory circuit (407);
During except system buildup and initialization, system all is operated in normal mode of operation, comprises that step is following:
Step 201: front end difference video driving module and twisted-pair visual frequency matrix all switch to the matrix operating state; Shown in accompanying drawing 6, signal source outputs to computer video through normal/test mode diverter switch (603) output, converts the output of difference video into through single-ended/difference video conversion circuit (604);
Step 202: shown in accompanying drawing 5; To video matrix switch module (501), video matrix switch module (501) switches to desired video-out port with the desired video inputs mouth of channel command to microcontroller (503) to outside switching command decoding back sendaisle control command;
Step 203: the difference video signal of differential received and attenuation compensation module (502) receiver, video matrix switch module (501) output;
Step 204: microcontroller (503) reads the corresponding attenuation compensation parameter control figure potentiometer (505) of this road video inputs mouth of parameter memory circuit (507), and digital regulation resistance (505) converts the input digit amount to analog quantity and outputs to differential received and attenuation compensation module (502);
Step 205: differential received and attenuation compensation module (502) are accomplished gain, peak value, migration to vision signal according to the decay control of digital regulation resistance (505) output analog quantity, and convert difference video signal to rgb video and output to programmable analog video delay line (504);
Step 206: microcontroller (503) reads the corresponding time lag parameter control programmable analog video delay line (504) of this road video inputs mouth of parameter memory circuit (507), and each color component is overlapped because of time lag reaches consistent;
Step 207: repeating step 201 makes the video inputs mouth performance that each road output signal switches reach predetermined characteristic to step 206.
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| CN105915848B (en) * | 2016-05-06 | 2019-01-11 | 浙江宇视科技有限公司 | Monitoring display screen, display and control terminal, interface conversion equipment and video wall group network system |
| CN108566522A (en) * | 2018-03-28 | 2018-09-21 | 中国船舶重工集团公司第七0九研究所 | A kind of multi-channel video director system and method |
| CN114245004A (en) * | 2021-11-29 | 2022-03-25 | 浙江大华技术股份有限公司 | Image compensation method, system, hard disk video recorder and readable storage medium |
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