CN102724514A - Method and device for compensating transmission loss of analog video signal and equipment for receiving analog video signal - Google Patents
Method and device for compensating transmission loss of analog video signal and equipment for receiving analog video signal Download PDFInfo
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- CN102724514A CN102724514A CN2012101519558A CN201210151955A CN102724514A CN 102724514 A CN102724514 A CN 102724514A CN 2012101519558 A CN2012101519558 A CN 2012101519558A CN 201210151955 A CN201210151955 A CN 201210151955A CN 102724514 A CN102724514 A CN 102724514A
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Abstract
The invention discloses a method and a device for compensating transmission loss of an analog video signal and equipment for receiving the analog video signal, and aims to improve the quality of the analog video signal subjected to loss compensation. The method comprises the following steps of: receiving the analog video signal; respectively determining a loss parameter value and a chrominance subcarrier frequency of the analog video signal; respectively determining a characteristic value of each pre-defined nonlinear curve according to the chrominance subcarrier frequency, wherein the pre-defined nonlinear curves corresponds to transmission cable types in a one-to-one correspondence manner; determining a characteristic value matched with the loss parameter value; determining a nonlinear automatic gain control (AGC) curve parameter combination according to the nonlinear curve corresponding to the characteristic value matched with the loss parameter value; and performing transmission loss compensation on the analog video signal according to the determined AGC curve parameter combination.
Description
Technical field
The present invention relates to the analog video signal processing technology field, relate in particular to the compensation method of a kind of analog video signal loss, device and receiving equipment.
Background technology
At present; In field of video monitoring; The video capture device of front end collects video and converts analog video signal into through after a series of processing, and analog video signal employing coaxial cable transfers to the receiving equipment of rear end, in signals transmission; The kind of the coaxial cable of signal frequency, transmission range and employing all can have influence on the quality of signal transmission, causes the loss of signal.Therefore, receiving equipment need remedy the loss of signal in the transmission course through automatic gain control (AGC, Automatic Gain Control).Because the frequency range of conventional analogue vision signal is less, generally at 0 ~ 6MHz, therefore, the characteristic close on the analog video signal frequency domain need not to carry out special processing.But, along with the development of video monitoring technology, the current high definition analog video signal transmission means that occurred; At present, generally adopt 1280H or the transmission means of 1920H, its signal frequency range is respectively at 0 ~ 20MHz and 0 ~ 50MHz; In general, signal frequency is high more, and it is big more to decay; Therefore, make the differentiation that has loss of signal on the whole frequency domain, need carry out Nonlinear A GC compensation it.Simultaneously; Because transmission cable type and transmission range are uncertain; If adopt unified Nonlinear A GC compensation; Might cause signal quality deteriorates, therefore, how carry out Nonlinear A GC compensation and become one of technical problem that needs to be resolved hurrily in the prior art to the loss in the high definition analog video signal transmission course.
Summary of the invention
The embodiment of the invention provides the compensation method of a kind of analog video signal loss, device and receiving equipment, in order to compensate to the loss in the analog video signal transmission course, improves the analog video signal quality.
The embodiment of the invention provides the compensation method of a kind of analog video signal loss, comprising:
Receive analog video signal;
Confirm the loss parameter value and the chrominance subcarrier frequency of said analog video signal respectively;
According to said chrominance subcarrier frequency, confirm the characteristic value of each predefined nonlinear curve respectively, wherein, said predefined nonlinear curve is corresponding one by one with the transmission cable type;
Confirm characteristic value with said loss parameter value coupling; And
According to the corresponding nonlinear curve of characteristic value of said loss parameter value coupling, confirm that non-linear automatic gain control AGC parameter of curve makes up; And
The Nonlinear A GC parameter of curve combination that utilization is determined is carried out the loss compensation to said analog video signal.
The embodiment of the invention provides a kind of analog video signal loss compensation arrangement, comprising:
Receiving element is used to receive analog video signal;
First confirms the unit, is used for confirming respectively the loss parameter value and the chrominance subcarrier frequency of said analog video signal;
Second confirms the unit, is used for according to said chrominance subcarrier frequency, confirms the characteristic value of each predefined nonlinear curve respectively, and wherein, said predefined nonlinear curve is corresponding one by one with the transmission cable type;
The 3rd confirms the unit, is used for the characteristic value of definite and said loss parameter value coupling;
The 4th confirms the unit, is used for basis and the corresponding nonlinear curve of characteristic value that said loss parameter value matees, and confirms the combination of non-linear automatic gain control AGC parameter of curve;
Compensating unit is used to utilize the Nonlinear A GC parameter of curve combination of determining that said analog video signal is carried out the loss compensation.
The embodiment of the invention provides a kind of analog video signal receiving equipment, comprises above-mentioned analog video signal loss compensation arrangement.
The compensation method of analog video signal loss, device and receiving equipment that the embodiment of the invention provides; Carrying out loss when compensation to receiving analog video signal; According to different cable type; Define multiple nonlinear curve in advance; After receiving analog video signal, determine the loss parameter value of this analog video signal, and according to the nonlinear curve of the loss parameter value selection of determining with its coupling; And confirm to be used for the analog video signal that receives is carried out the Nonlinear A GC parameter of curve combination of Nonlinear A GC compensation according to the nonlinear curve of selecting, with this analog video signal that receives is carried out the loss nonlinear compensation.Because, in the said process, analog video signal is carried out the loss compensation to the characteristic of transmission cable, than using unified Nonlinear A GC parameter of curve to compensate, improved the quality of analog video signal to analog video signal.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Fig. 1 is in the embodiment of the invention, the implementing procedure sketch map of analog video signal loss compensation method;
Fig. 2 is in the embodiment of the invention, each preset nonlinear curve sketch map;
Fig. 3 is in the embodiment of the invention, a capable synchronous head range value that receiving equipment collects and a colour burst range value sketch map;
Fig. 4 is in the embodiment of the invention, the structural representation of analog video signal loss compensation arrangement.
Embodiment
In order to improve analog video signal is carried out the analog video signal quality behind the loss balancing, the embodiment of the invention provides the compensation method of a kind of analog video signal loss.
The analog video signal loss compensation method that the embodiment of the invention provides is applicable to the loss compensation of the high definition analog video signal of 1280H, 1920H and other form.
Below in conjunction with Figure of description the preferred embodiments of the present invention are described; Be to be understood that; Preferred embodiment described herein only is used for explanation and explains the present invention; And be not used in qualification the present invention, and under the situation of not conflicting, embodiment and the characteristic among the embodiment among the present invention can make up each other.
Embodiment one
As shown in Figure 1, in the embodiment of the invention, the implementing procedure sketch map of analog video signal loss compensation method may further comprise the steps:
S101, reception analog video signal;
The loss parameter value and the chrominance subcarrier frequency of S102, the analog video signal confirming to receive respectively;
For the ease of describing, in the embodiment of the invention with f
cThe chrominance subcarrier frequency of expression analog video signal, f
cCan confirm according to the corresponding signal type of analog video signal; The signal type that relates in the embodiment of the invention includes but not limited to be SD signal type and high-definition signal type; Be to be understood that; The high-definition signal type can comprise the high-definition signal type of multiple resolution, the chrominance subcarrier frequency f of the analog video signal of same signal type
cIdentical, be fixed value.
The chrominance subcarrier frequency that S103, basis are determined, the characteristic value of definite each predefined nonlinear curve respectively;
Wherein, each predefined nonlinear curve is corresponding one by one with the transmission cable type, during practical implementation, can define according to other transmission characteristic according to different transmission cables.Concrete, according to the transmission characteristic of transmission cable, in advance according to main transmission cable type, the corresponding nonlinear function f of preset multiple nonlinear curve
(n), need to prove that n representes the curve sign of nonlinear curve, f
(n)For function about the video signal transmission frequency, as shown in Figure 2, be nonlinear function f
(1), f
(2), f
(3)... f
(n)The sketch map of the nonlinear curve that difference is corresponding.f
(n)Characteristic value be when frequency video signal be chrominance subcarrier frequency f
cThe time corresponding functional value.
S104, confirm the characteristic value of mating with the loss parameter value;
S105, basis and the corresponding nonlinear curve of characteristic value that the loss parameter value matees are confirmed the combination of Nonlinear A GC parameter of curve;
The Nonlinear A GC parameter of curve combination that S106, utilization are determined is carried out the loss compensation to the analog video signal that receives.
Wherein, among the step S102, can confirm the loss parameter value f of this analog video signal according to following method
(g):
During practical implementation, can confirm the characteristic value with loss parameter value coupling according to following steps among the step S104:
Concrete, the nonlinear function f that nonlinear curve as shown in Figure 2 is corresponding
(1), f
(2), f
(3)... F
(n), according to nonlinear function f
(n)At f
cThe characteristic value that (unit is MHz) located is searched and the immediate characteristic value of loss parameter value, supposes that lookup result is f
(2)At f
cThe characteristic value and the loss parameter value at place are the most approaching, then f
(2)Corresponding nonlinear curve is the nonlinear curve of determining that matees most with the loss parameter value.
After accomplishing Curve Matching, can access the nonlinear function f of this nonlinear curve
(n), because f
(n)The functional value corresponding at different frequency values places is different, therefore according to formula f
(n)* x can determine one group of Nonlinear A GC parameter of curve, utilizes the Nonlinear A GC parameter of curve combination of determining that the analog video signal that receives is carried out the loss compensation.
In the embodiment of the invention; Select in the preset nonlinear curve the nonlinear curve of coupling according to the relation of the attenuation degree of the attenuation degree of the colour burst head of the analog video signal form that receives (including but not limited to SD signal format and high-definition signal form) and row synchronous head; And the Nonlinear A GC parameter combinations of confirming to be used to carry out the compensation of analog video signal loss according to the nonlinear curve of selecting; And adopt the incompatible configuration Nonlinear A of this parameter group GC curve; Make to the analog video signal loss compensation that receives more targeted; The AGC compared with parameters same with use improved the analog video signal quality after the analog video signal loss compensates.Simultaneously,, need not manual work and be configured, thereby can accomplish the loss compensation automatically because the decay of colour burst head and row synchronous head can detect, and according to different transmission cable types, the Nonlinear A GC parameter combinations that Adaptive matching need be used.
Need to prove; The analog video signal loss compensation method that the embodiment of the invention provides can but be not limited to be used for the analog video signal loss compensation of 1280H, 1920H form, also can be used for the analog video signal loss compensation of extended formatting.
Based on same inventive concept; A kind of analog video signal loss compensation and receiving equipment also are provided in the embodiment of the invention; Because the principle that this device and receiving equipment are dealt with problems is similar with the compensation method of analog video signal loss; Therefore the enforcement of this device and receiving equipment can repeat part and repeat no more referring to the enforcement of method.
As shown in Figure 4, the structural representation of the analog video signal loss compensation arrangement that provides for the embodiment of the invention comprises:
Receiving element 401 is used to receive analog video signal;
First confirms unit 402, is used for the loss parameter value and the chrominance subcarrier frequency of the analog video signal of definite respectively receiving element 401 receptions;
Wherein, predefined nonlinear curve is corresponding one by one with the transmission cable type;
The 3rd confirms unit 404, is used for characteristic value definite and loss parameter value coupling;
The 4th confirms unit 405, is used for basis and the corresponding nonlinear curve of characteristic value that the loss parameter value matees, and confirms the combination of Nonlinear A GC parameter of curve;
Compensating unit 406 is used to utilize the Nonlinear A GC parameter of curve of determining to make up the analog video signal that receiving element 401 is received and carries out the loss compensation.
In the practical implementation, first confirms unit 402, can comprise:
Gather subelement, be used for gathering respectively a colour burst range value and row synchronous head range value of the analog video signal that receiving element 401 receives;
First confirms subelement, is used for confirming according to following formula the difference of a colour burst range value and row synchronous head range value: f
(g)=x * 20log (0.3/c), wherein, f
(g)The difference of an expression colour burst range value and row synchronous head range value;
σ d is a preset value; C is a colour burst range value; Y is row synchronous head range value;
Second confirms subelement, is used for confirming according to following formula the loss parameter value of analog video signal: f
(g)/ x.
In the practical implementation, first confirms unit 402, can comprise:
The 3rd confirms subelement, the signal type of the analog video signal that is used for confirming that receiving element 401 receives, and this signal type comprises the high-definition signal type of SD signal type and multiple resolution at least;
The 4th confirms subelement, is used for confirming the chrominance subcarrier frequency of this analog video signal according to the 3rd definite subelement signal type that determine, this analog video signal.
In the practical implementation, the 3rd confirms unit 404, can comprise:
The 5th confirms subelement, is used for the characteristic value to each preset nonlinear curve, confirms the difference of this characteristic value and loss parameter value;
The 6th confirms subelement, be used for with the minimum characteristic value of the difference of loss parameter value, confirm as characteristic value with loss parameter value coupling.
In the practical implementation, the 4th confirms unit 405, can be used for confirming the nonlinear function corresponding with said nonlinear curve, and according to formula f
(n)* x confirms the combination of Nonlinear A GC parameter of curve, and wherein: n is a natural number, the corresponding curve sign of nonlinear curve that expression is corresponding with the characteristic value of said loss parameter value coupling; f
(n)Represent the nonlinear function corresponding with said nonlinear curve.
Need to prove; The video analog signal loss compensation arrangement that the embodiment of the invention provides can be arranged in the receiving equipment; There is receiving equipment that the video analog signal that receives is carried out the loss compensation; It is a kind of preferably execution mode of the embodiment of the invention that video analog signal loss compensation arrangement is arranged in the receiving equipment, during practical implementation, can also video analog signal loss compensation arrangement be arranged in miscellaneous equipment or the newly added equipment.
The compensation method of analog video signal loss, device and receiving equipment that the embodiment of the invention provides; Carrying out loss when compensation to receiving analog video signal; According to different cable type, preset multiple nonlinear curve is after receiving analog video signal; Determine the loss parameter value of this analog video signal; And select the nonlinear curve with its coupling according to the loss parameter value determined, and confirm to be used for the analog video signal that receives is carried out the Nonlinear A GC parameter of curve combination of Nonlinear A GC compensation according to the nonlinear curve of selecting, with this analog video signal that receives is carried out the loss nonlinear compensation.Because, in the said process, analog video signal is carried out the loss compensation to the characteristic of transmission cable, than using unified Nonlinear A GC parameter of curve to compensate, improved the quality of analog video signal to analog video signal.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of the embodiment of complete hardware embodiment, complete software implementation example or combination software and hardware aspect.And the present invention can be employed in the form that one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code go up the computer program of implementing.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out through the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in ability vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work; Make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device; Make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of on computer or other programmable devices, carrying out is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. analog video signal loss compensation method is characterized in that, comprising:
Receive analog video signal;
Confirm the loss parameter value and the chrominance subcarrier frequency of said analog video signal respectively;
According to said chrominance subcarrier frequency, confirm the characteristic value of each predefined nonlinear curve respectively, wherein, said predefined nonlinear curve is corresponding one by one with the transmission cable type;
Confirm characteristic value with said loss parameter value coupling; And
According to the corresponding nonlinear curve of characteristic value of said loss parameter value coupling, confirm that non-linear automatic gain control AGC parameter of curve makes up; And
The Nonlinear A GC parameter of curve combination that utilization is determined is carried out the loss compensation to said analog video signal.
2. the method for claim 1 is characterized in that, confirms the loss parameter value of said analog video signal according to following method:
Gather a colour burst range value and row synchronous head range value of said analog video signal respectively; And
Confirm the difference of a colour burst range value and row synchronous head range value: f according to following formula
(g)=x * 20log (0.3/c), wherein:
f
(g)The difference of an expression colour burst range value and row synchronous head range value;
σ d is a preset value;
C is a colour burst range value;
Y is row synchronous head range value;
The loss parameter value of confirming said analog video signal is f
(g)/ x.
3. according to claim 1 or claim 2 method is characterized in that, confirms the chrominance subcarrier frequency of said analog video signal, specifically comprises:
Confirm the signal type of said analog video signal, said signal type comprises the high-definition signal type of SD signal type and multiple resolution at least;
According to the signal type of said analog video signal, confirm the chrominance subcarrier frequency of said analog video signal.
4. the method for claim 1 is characterized in that, confirms and the characteristic value of said loss parameter value coupling, specifically comprises:
To the characteristic value of each preset nonlinear curve, confirm the difference of this characteristic value and said loss parameter value;
Will with the minimum characteristic value of the difference of said loss parameter value, confirm as characteristic value with said loss parameter value coupling.
5. method as claimed in claim 2 is characterized in that, according to the corresponding nonlinear curve of characteristic value of said loss parameter value coupling, confirm that non-linear automatic gain control AGC parameter of curve makes up, and specifically comprises:
Confirm the nonlinear function corresponding with said nonlinear curve; And
According to formula f
(n)* x confirms the combination of Nonlinear A GC parameter of curve, wherein:
N is a natural number, the corresponding curve sign of nonlinear curve that expression is corresponding with the characteristic value of said loss parameter value coupling;
f
(n)Represent the nonlinear function corresponding with said nonlinear curve.
6. an analog video signal loss compensation arrangement is characterized in that, comprising:
Receiving element is used to receive analog video signal;
First confirms the unit, is used for confirming respectively the loss parameter value and the chrominance subcarrier frequency of said analog video signal;
Second confirms the unit, is used for according to said chrominance subcarrier frequency, confirms the characteristic value of each predefined nonlinear curve respectively, and wherein, said predefined nonlinear curve is corresponding one by one with the transmission cable type;
The 3rd confirms the unit, is used for the characteristic value of definite and said loss parameter value coupling;
The 4th confirms the unit, is used for basis and the corresponding nonlinear curve of characteristic value that said loss parameter value matees, and confirms the combination of non-linear automatic gain control AGC parameter of curve;
Compensating unit is used to utilize the Nonlinear A GC parameter of curve combination of determining that said analog video signal is carried out the loss compensation.
7. device as claimed in claim 6 is characterized in that, first confirms the unit, comprising:
Gather subelement, be used for gathering respectively a colour burst range value and row synchronous head range value of said analog video signal;
First confirms subelement, is used for confirming according to following formula the difference of a colour burst range value and row synchronous head range value: f
(g)=x * 20log (0.3/c), wherein:
f
(g)The difference of an expression colour burst range value and row synchronous head range value;
σ d is a preset value;
C is a colour burst range value;
Y is row synchronous head range value;
Second confirms subelement, is used for confirming according to following formula the loss parameter value of said analog video signal: f
(g)/ x.
8. like claim 6 or 7 described devices, it is characterized in that first confirms the unit, comprising:
The 3rd confirms subelement, is used for confirming the signal type of said analog video signal, and said signal type comprises the high-definition signal type of SD signal type and multiple resolution at least;
The 4th confirms subelement, is used for confirming the chrominance subcarrier frequency of said analog video signal according to the 3rd definite subelement signal type that determine, said analog video signal.
9. device as claimed in claim 6 is characterized in that, the 3rd confirms the unit, comprising:
The 5th confirms subelement, is used for the characteristic value to each preset nonlinear curve, confirms the difference of this characteristic value and said loss parameter value;
The 6th confirms subelement, be used for with the minimum characteristic value of the difference of said loss parameter value, confirm as characteristic value with said loss parameter value coupling.
10. device as claimed in claim 7 is characterized in that,
The 4th confirms the unit, specifically be used for confirming the nonlinear function corresponding with said nonlinear curve, and according to formula f
(n)* x confirms the combination of Nonlinear A GC parameter of curve, and wherein: n is a natural number, the corresponding curve sign of nonlinear curve that expression is corresponding with the characteristic value of said loss parameter value coupling; f
(n)Represent the nonlinear function corresponding with said nonlinear curve.
11. an analog video signal receiving equipment is characterized in that, comprises the described device of the arbitrary claim of claim 6 ~ 10.
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