CN107592518A - A kind of composite video signal quality index determines method and device - Google Patents
A kind of composite video signal quality index determines method and device Download PDFInfo
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Abstract
The invention discloses a kind of composite video signal quality index to determine method and device, and methods described includes：The coenvelope line of composite video signal is obtained, determines the first range value of the coenvelope line crest；According to first range value, the span of luminance component amplitude in the composite video signal is determined, and determines the span that colourity relative luminance is delayed in the composite video signal；To the luminance component amplitude and colourity relative luminance delay difference assignment in corresponding span, the assignment is substituted into the luminance component amplitude, colourity relative luminance delay as in the coenvelope line function of variable, and determines to substitute into the second range value of the crest of the function of the coenvelope line of assignment；When second range value and the first range value difference are less than preset value, each assignment being delayed by the luminance component amplitude and the colourity relative luminance determines the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
Description
Technical field
The present invention relates to video measurement technology, and in particular to a kind of composite video signal quality index determines method and dress
Put.
Background technology
Composite video signal (CVBS, Composite Video Broadcast Signal) is the mark being widely used
Standard, also referred to as base band video or RCA (Radio Corporation of American) video, it is transmitted with analog waveform
Data.Composite video includes aberration (tone and saturation degree) and brightness (light) information, and they are synchronous in blanking pulse,
Transmitted with same signal.In actual use, specifically also include PAL system (PAL, Phase Alteration Line) and state of the U.S.
Family's television standard committee system (NTSC, National Television Standards Committee) two kinds of standards, they
Identical interface is used with CVBS, is more specifically to close vision signal standard.
Many television sets are designed with CVBS interfaces at present, i.e., yellow for vision signal, it is white to believe for left audio
Number, it is red for right channel audio signal.The set top box and network machine top box of most of cable televisions are also provided with CVBS interfaces,
Analog signal, i.e. CVBS signals, and pass through television for play can so be converted digital signals into.
The method for converting digital signals into CVBS signals is very more, is changed generally by CVBS decoding chips, still
CVBS signals are more complicated composite video signals, containing indexs such as multiple analog voltage level, time intervals, and all are regarded
Frequency information is only transmitted using a transmission lines, different by the combination of monochrome information, color information and synchronizing signal in a signal
The video signal quality that converts of CVBS decoding chips it is widely different, it is therefore desirable to put goods on the market in CVBS decoding chips
It is preceding to make strict test, to verify the quality of CVBS decoding chips.
The method of test can test the vision signal that CVBS decoding chips convert, and can also decode core in CVBS
Before piece is also manufactured without out, pass through the register transfer level (RTL, Register Transfer Level) of CVBS decoding chips
Code, CVBS signals are simulated by analogue means, the CVBS signals after simulation are tested.
Above-mentioned method of testing can all influence the bright gain inequality of color of video quality and the determination of the bright delay poor index of color, and error is non-
Chang great, this directly affects the Quality estimation to CVBS signals.
Also method of testing is that CVBS signals are sent into decoder, all the way into luminance channel, by color negative carrier trap
Device (4.43mhz trappers) sponges carrier chrominance signal, and takes out luminance signal, and another way is taken out by bandpass filter
4.43mhz carrier chrominance signal, the amplitude of the two signals is measured respectively and observes delay of the envelope in time domain.This test side
Method is due to that when signal is taken out in distribution, can introduce extra amplitude distortion and sequential distortion, cause error very big.
The content of the invention
To solve existing technical problem, the embodiment of the present invention it is expected to provide a kind of composite video signal quality index
Method and device is determined, the bright gain inequality of color of the CVBS signals after the conversion of CVBS decoding chips can be more accurately determined and color is bright prolongs
The time difference, judge the conversion quality of CVBS decoding chips.
What the technical scheme of the embodiment of the present invention was realized in：
The embodiments of the invention provide a kind of composite video signal quality index to determine method, and methods described includes：
The coenvelope line of composite video signal is obtained, determines the first range value of the coenvelope line crest；
According to first range value, the span of luminance component amplitude in the composite video signal is determined, and really
The span that colourity relative luminance is delayed in the fixed composite video signal；
To the luminance component amplitude and colourity relative luminance delay difference assignment in corresponding span, by described in
Assignment substitutes into be determined in the coenvelope line function of variable with the luminance component amplitude, colourity relative luminance delay
Substitute into the second range value of the crest of the function of the coenvelope line of assignment；
When second range value and the first range value difference are less than preset value, pass through the luminance component amplitude
The bright gain inequality of the color of the composite video signal and the bright delay inequality of color are determined with each assignment of colourity relative luminance delay.
Preferably, the coenvelope line for obtaining composite video signal, including：
The peak point in the composite video signal each cycle is obtained, connects the peak point, forms coenvelope line.
Preferably, first range value for determining the coenvelope line crest, including：
The peak point of the coenvelope line is obtained, measures the amplitude of the peak point, obtains first range value.
Preferably, the span for determining luminance component amplitude in the composite video signal, including：
According to first range value, the span for determining luminance component amplitude in the composite video signal is zero to arrive
First range value；
The span for determining that colourity relative luminance is delayed in the composite video signal, including：
The scope that colourity relative luminance is delayed in the composite video signal is more than or equal to-π, and is less than or equal to π.
Preferably, second range value for determining to substitute into the crest of the function of the coenvelope line of assignment, including；
The function of coenvelope line based on the substitution assignment, calculates the function of the coenvelope line for substituting into assignment most
Big value, is defined as second range value by the maximum calculated.
Preferably, methods described also includes；
The respective coenvelope line of the multiple composite video signal obtained respectively based on multiple composite video signals, is based on
Each coenvelope line determines the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
The embodiment of the present invention additionally provides a kind of composite video signal quality index determining device, and described device includes obtaining
Module, the first determining module, the second determining module, the 3rd determining module and the 4th determining module；Wherein,
The acquisition module, for obtaining the coenvelope line of composite video signal；
First determining module, for determining the first range value of the coenvelope line crest；
Second determining module, for according to first range value, determining brightness point in the composite video signal
The span of discharge amplitude, and determine the span that colourity relative luminance is delayed in the composite video signal；
3rd determining module, for relatively bright to the luminance component amplitude and colourity in corresponding span
Degree delay difference assignment, the assignment is substituted into the luminance component amplitude, colourity relative luminance delay as variable
In coenvelope line function, and determine to substitute into the second range value of the crest of the function of the coenvelope line of assignment；
4th determining module, for being less than preset value when second range value and the first range value difference
When, each assignment being delayed by the luminance component amplitude and the colourity relative luminance determines the color of the composite video signal
The bright bright delay inequality of gain inequality and color.
Preferably, the acquisition module is additionally operable to：
The peak point in the composite video signal each cycle is obtained, connects the peak point, forms coenvelope line.
Preferably, first determining module is additionally operable to：
The peak point of the coenvelope line is obtained, measures the amplitude of the peak point, obtains first range value.
Preferably, second determining module is additionally operable to：
According to first range value, the span for determining luminance component amplitude in the composite video signal is zero to arrive
First range value；
Second determining module is additionally operable to determine the value model that colourity relative luminance is delayed in the composite video signal
Enclose：The scope that colourity relative luminance is delayed in the composite video signal is more than or equal to-π, and is less than or equal to π.
Preferably, the 3rd determining module is additionally operable to：
The function of coenvelope line based on the substitution assignment, calculates the function of the coenvelope line for substituting into assignment most
Big value, is defined as second range value by the maximum calculated.
Preferably, the 4th determining module is additionally operable to：
The respective coenvelope line of the multiple composite video signal obtained respectively based on multiple composite video signals, is based on
Each coenvelope line determines the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
The embodiment of the present invention provides a kind of composite video signal quality index and determines method and device, obtains composite video letter
Number coenvelope line, determine the first range value of the coenvelope line crest；According to first range value, determine described compound
The span of luminance component amplitude in vision signal, and determine that what colourity relative luminance in the composite video signal was delayed takes
It is worth scope；To the luminance component amplitude and colourity relative luminance delay difference assignment in corresponding span, by described in
Assignment substitutes into be determined in the coenvelope line function of variable with the luminance component amplitude, colourity relative luminance delay
Substitute into the second range value of the crest of the function of the coenvelope line of assignment；When second range value and the first amplitude value difference
When value is less than preset value, determined by each assignment of the luminance component amplitude and colourity relative luminance delay described compound
The bright gain inequality of color and the bright delay inequality of color of vision signal；It can be seen that the embodiment of the present invention passes through the approximate calculation to CVBS signals, energy
The quality index of the bright gain inequality of color and the bright delay inequality of color is more accurately determined, judges the conversion quality of CVBS decoding chips.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that the composite video signal quality index of the embodiment of the present invention one determines method；
Fig. 2 is the 20T impulse waveform schematic diagrames of the composite video signal of the embodiment of the present invention one；
Fig. 3 is that the frequency of the composite video signal of the embodiment of the present invention one tends to just infinite schematic diagram one；
Fig. 4 is that the frequency of the composite video signal of the embodiment of the present invention one tends to just infinite schematic diagram two；
Fig. 5 is that the frequency of the composite video signal of the embodiment of the present invention one tends to just infinite schematic diagram three；
Fig. 6 is that the frequency of the composite video signal of the embodiment of the present invention one tends to just infinite schematic diagram four；
Fig. 7 is the oscillogram that Fig. 3 envelope is individually taken out to formation；
Fig. 8 is the schematic flow sheet that the composite video signal quality index of the embodiment of the present invention two determines method；
Fig. 9 is the schematic diagram of triplex video signal quality index determining device of the embodiment of the present invention.
Embodiment
The general principle of the embodiment of the present invention is：Calculate the chrominance component amplitude that the bright gain inequality of color and the bright delay inequality of color need
AC, luminance component amplitude AYIt is delayed with colourity relative luminanceIt can not directly measure, but can first survey from composite video signal
Measure envelope crest, the actual measurement range value of trough of composite video signal；Establish with the chrominance component amplitude, luminance component
Amplitude and the envelope line function that the delay of colourity relative luminance is variable, then according to this function, in AYWithTheoretical span
It is interior, to AYWithMultiple assignment tentative calculation, obtain envelope crest, the theoretical amplitude value of trough, Step wise approximation actual measurement range value,
Finally give the A of setting accuracyC、AYWithThe principle of the embodiment of the present invention be obtained by a kind of approximate calculation method it is compound
The quality index of vision signal, this approximate calculation method are well suited for calculating by computer.
The present invention is described further again below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment one
Fig. 1 determines the schematic flow sheet of method, methods described for the composite video signal quality index of the embodiment of the present invention one
Executive agent can be test main frame, more specifically can be a computer, as shown in figure 1, methods described includes：
Step 101：The coenvelope line of composite video signal is obtained, determines the first range value of the coenvelope line crest；
Here, the coenvelope line of composite video signal is obtained by test main frame, the composite video signal is to be tested
Standard signal, usually according to composite video decoding chip, that is, the RTL code of CVBS decoding chips, pass through and simulate dress
The composite video signal simulated is put, is data signal, can directly be tested main frame acquisition；Can also be from composite video solution
Code chip directly exports, that is, can be by CVBS signals that general analog television machine receives, it is necessary to pass through analog-digital commutator
Main frame acquisition could be tested；
The acquisition of the coenvelope line is by the way that the peak point of the composite video signal is connected to obtain, specifically
Ground, handled by application program, the application program is provided with specific algorithm, can automatically capture the composite video
The peak point of signal, then the tangent line tangent with the peak point is drawn, finally tangent line is smoothly connected, the application program
Usually it is arranged on the video frequency signal processing application program of test main frame.
Specifically, the video processing applications program of the test main frame can be matrix labotstory (MATLAB, Matrix
Laboratory)。
The concrete signal of the bright gain inequality of color and the bright delay inequality of color is 20T impulse waveforms in test compound vision signal, 20T arteries and veins
The definition of punching, in the waveform of 20T pulses, when amplitude reaches the half of maximum, between corresponding two time points away from
From being the time cycle for 20T, T；Specific to standard, for PAL, T 100ns；For NTSC, T 125ns.
In 20T pulses, colourity and luminance signal are Sine-squared ripples, and carrier chrominance signal is superimposed upon in luminance signal.
Fig. 2 is the 20T impulse waveforms in the present embodiment, and the π of ω=2 f, f are the carrier frequency of composite video signal.
In order to preferably observe 20T impulse waveforms, it is assumed that the frequency of the composite video signal tends to just infinite, so,
The envelope of composite video signal becomes apparent from, and is specifically shown in Fig. 3~Fig. 6, and Fig. 3~Fig. 6 is that chromatic component and luminance component are Bu Tong special
Four types of sign, wherein：
ACAnd AYThe respectively amplitude of chromatic component and luminance component,For the delay of colourity relative luminance.
Fig. 3 is characterized in：AC＞ AY,I.e. the amplitude of chromatic component is more than the amplitude of luminance component, and colourity is advanced
Brightness；
Fig. 4 is characterized in：AC＞ AY,I.e. the amplitude of chromatic component is more than the amplitude of luminance component, colourity hysteresis
Brightness；
Fig. 5 is characterized in：AC<AY,I.e. the amplitude of chromatic component is less than the amplitude of luminance component, and colourity is advanced
Brightness；
Fig. 6 is characterized in：AC<AY,I.e. the amplitude of chromatic component is less than the amplitude of luminance component, colourity hysteresis
Brightness；
Above-mentioned figure is characterized in what is obtained according to the shape qualitative analysis of envelope.
Further, envelope in Fig. 3 is individually shown, obtains the envelope shown in Fig. 7.
First range value of the coenvelope line crest is the value of the M shown in Fig. 7, determine first range value be for
Luminance component amplitude and the span of colourity relative luminance delay in composite video signal are determined in subsequent step；
Determining the method for first range value can include：The peak point of the coenvelope line is obtained, measures the peak
It is worth the amplitude of point, obtains first range value, i.e., the value of the M shown in Fig. 7.
Step 102：According to first range value, the value model of luminance component amplitude in the composite video signal is determined
Enclose, and determine the span that colourity relative luminance is delayed in the composite video signal；
Need to establish luminance component amplitude in a composite video signal, colourity point after obtaining first range value
The relational expression of discharge amplitude, the delay of colourity relative luminance and M, then determines therefrom that luminance component amplitude, colourity relative luminance
The span of delay, it is specific as follows：
According to the principle of composite video signal, it is known that the colourity and brightness waveform of composite video signal are respectively Sine-squared
Ripple, therefore available AC、AYWithIt is expressed as the canonical function of the envelope of composite video signal as variable, specifically, in Fig. 7
Coenvelope line and lower envelope line respectively with following formulas (1), (2) represent.
In above-mentioned two formula, CVBS_t is coenvelope line, and CVBS_b is lower envelope line, ACAnd AYRespectively chromatic component and bright
The amplitude of component is spent,For the delay of colourity relative luminance.
According to formula (1), it is assumed that the delay of colourity relative luminance is zero, i.e.,It can then obtain：M=Ay+Ac；
And Ac is Sine-squared, more than or equal to zero, so Ay is not more than M, therefore Ay span can be obtained
M is arrived for 0, i.e., the span of luminance component amplitude is zero to arrive first range value in described composite video signal；
The characteristics of from SIN function, in formula (1)Cycle is 2 π, andFor colourity relative luminance
Delay, it is possible to advanced, it is also possible to lag, therefore it is settableSpan be more than or equal to-π, and be less than or equal to
π,Span can be expressed as [- π, π].
Step 103：The luminance component amplitude and the delay of colourity relative luminance are assigned respectively in corresponding span
Value, the assignment is substituted into the coenvelope line function with the luminance component amplitude, colourity relative luminance delay for variable
In, and determine to substitute into the second range value of the crest of the function of the coenvelope line of assignment；
When second range value and the first range value difference are less than preset value, pass through the luminance component amplitude
The bright gain inequality of the color of the composite video signal and the bright delay inequality of color are determined with each assignment of colourity relative luminance delay.
Specifically, for the difference that is delayed in corresponding span to the luminance component amplitude and colourity relative luminance
After assignment, the second range value of the crest of the function of the coenvelope line is can determine that, it is necessary to enter to the envelope canonical function
Line translation, obtain luminance component amplitude and the delay of colourity relative luminance and the relation of the second range value of the envelope crest
Formula；
Certainly, during assignment tentative calculation, it is also necessary to some other formula, it is clear in order to describe, first by calculating process
In all formula for using first derive one by one：
Notice that formula (1) has a maximum, and formula (2) has a maximum and minimum when working as ω t ∈ [0, π].
Therefore respectively to formula (1) and formula (2) to t derivations, formula (3) and formula (4) are obtained.
When formula (1) and formula (2) reach maximum value or minimum value, formula (3) and formula (4) are respectively equal to 0, obtain (5) and formula
(6)。
If the t for meeting formula (5) is tt, the t for meeting formula (6) is tb1And tb2；According to tb1And tb2Relation can obtain formula (7)：
With reference to Fig. 7, by tt、tb1、tb2Formula (1) and formula (2) are substituted into formula (7), obtains formula (8), (9), (10)：
Formula (9) is added to obtain formula (11) with formula (10)：
AY-AC=Y1+Y2 (11)
Then formula (12) is derived by by formula (5)：
Finally give formula (13)：
Similarly, formula (14) can be derived by by formula (6)：
After deriving above-mentioned formula, to AYWithAssignment is distinguished in span, is obtained accordingly with formula (11) according to assignment
AC；Try to achieve ACAfterwards, by AC、AYWithSubstitution formula (13) obtains ω tt；
The ω t that will be tried to achievetSubstitution formula (8), determines the second range value of the coenvelope line, that is, calculates the substitution
The maximum of the function of the coenvelope line of assignment, i.e. M ' value,
To AYWithContinue assignment in the span of setting, obtain the second range value of multiple coenvelope lines；
When second range value and the first range value difference are less than preset value, pass through the luminance component amplitude
The bright gain inequality of the color of the composite video signal and the bright delay inequality of color are determined with each assignment of colourity relative luminance delay；
Specifically, calculated by equation below：
The result that formula (15) is tried to achieve is the bright gain inequality of color, unit %；
The result that formula (16) is tried to achieve is the bright delay inequality of color, unit ns；If result of calculation is negative, illustrate that colourity lags,
If result of calculation is just, illustrate that colourity is advanced；
Wherein, N is constant, because being 20T pulses, it is the time cycle to take 20, T；Specific to standard, for PAL, T
For 100ns；For NTSC, T 125ns；
Default difference value is that is, the requirement of CVBS decoding chips determines, does not repeat according to composite video decoding chip.
Further, in order that result of calculation is more accurate, multiple waveforms can be extracted from composite video signal, are counted respectively
Calculate the bright gain inequality of color and the bright delay inequality of color；
Specifically, the respective coenvelope of the multiple composite video signal obtained respectively based on multiple composite video signals
Line, the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color are determined based on each coenvelope line respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color
More specifically, according to composite video signal principle, it is known that the waveform of 20T pulses be initial phase for zero degree, 90 degree,
180 degree, the four of 270 degree kinds of waveform cycles, wherein zero degree, 180 degree and 90 degree, 270 degree of shape is just the same, simply crest ripple
Paddy is in opposite direction, as long as therefore calculate the index of zero degree and 90 degree of both waveforms, and average, i.e.,：
The composite video signal for being zero according to initial phase, calculate the bright gain inequality of the first color and the bright delay inequality of the first color：
According to the composite video signal that initial phase is 90 degree, the bright gain inequality of the second color and the bright delay inequality of the second color are calculated；
The bright gain inequality of color is obtained according to the average value of the bright gain inequality of the first color and the bright gain inequality of the second color, it is bright according to the first color
The average value of delay inequality and the bright delay inequality of the second color obtains the bright delay inequality of color.
Embodiment two
Fig. 8 determines the schematic flow sheet of method, methods described for the composite video signal quality index of the embodiment of the present invention two
Executive agent can be test main frame, more specifically can be a computer, as shown in figure 8, methods described includes：
Step 201：Determine the actual measurement range value of the coenvelope line of composite video signal, the crest of lower envelope line, trough；
Due to embodiment one determine luminance component amplitude and colourity relative luminance delay span be it is bigger,
The workload of calculating is bigger, and this step is tried to reduce luminance component amplitude and colourity is relatively bright on the basis of embodiment one
Spend the span of delay；
Specifically, on the basis of the step 101 of embodiment one, the coenvelope line except obtaining the composite video signal
Outside, the lower envelope line of the composite video signal is also obtained, it is determined that coenvelope line, the crest of lower envelope line, the reality of trough
Range value is surveyed, M, Y1 and Y2 are corresponded to respectively in Fig. 7；
So, in subsequent steps, can more accurately determine luminance component amplitude and colourity relative luminance delay
Span.
Step 202：Determine luminance component amplitude and the value model of colourity relative luminance delay in the composite video signal
Enclose；
On the basis of the step 102 of embodiment one, this step further determines that luminance component amplitude and colourity relative luminance
The span of delay, it is specific as follows：
1) span of luminance component amplitude is determined：
Previously described formula (11) is substituted into formula (8), A can be obtainedYSpan be：
2) span of colourity relative luminance delay is determined：
The span for determining the delay of colourity relative luminance in embodiment one in step 102 is [- π, π]；
ButFor square of SIN function, it can be seen from the characteristics of SIN function, the cycle contracting after square
It is half as large, so the span that colourity relative luminance can be delayed is arranged to [- pi/2, pi/2]；
Further, formula (13) is for calculating ω t, and determines that second range value has direct relation, before
Some formula be intended merely to derive formula (13), in formula (13)Span just determine colourity relative luminance delay
Span, therefore further qualitative analysis is made to formula (13), from (13) as can be seen that tg (2 ω t) is tan, just
It is π to cut period of a function, and in tg (2 ω t) is 2 times of ω t, and the cycle reduces half, and the cycle is pi/2, so colourity is relatively bright
The span of degree delay can also be pi/2, thus the span of colourity relative luminance delay could be arranged to [- π/4, π/
4]。
Step 203：The luminance component amplitude and the delay of colourity relative luminance are assigned respectively in corresponding span
Value, the assignment is substituted into coenvelope line, the lower bag being delayed with the luminance component amplitude, the colourity relative luminance as variable
In winding thread function, and determine to substitute into the coenvelope line of assignment, the crest of function of lower envelope line, the theoretical amplitude value of trough；
When the theoretical amplitude value and the difference of the actual measurement range value are less than preset value, pass through the luminance component width
Degree and each assignment of colourity relative luminance delay determine the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
On the basis of the step 103 of embodiment one, this step also needs to calculate crest, the trough of the lower envelope line function
Theoretical amplitude value；
Specifically, to AYWithAssignment is distinguished in span, corresponding A is obtained with formula (11) according to assignmentC；Try to achieve
ACAfterwards, by AC、AYWithSubstitution formula (13), formula (14) and formula (7) obtain ω tt、ωtb1With ω tb2If pay attention to ω tb1Less than 0, then
By ω tb1Plus pi/2 as the ω t calculated belowb1, i.e.,
The ω t that will be tried to achievet、ωtb1With ω tb2Substitution formula (8) (9) (10), determines coenvelope line, the ripple of lower envelope line function
The theoretical amplitude value at peak, trough, i.e. M ', Y1 ' and Y2 ' value, respectively with coenvelope line, the crest of lower envelope line, trough reality
Survey range value M, Y1 and Y2 to subtract each other, the absolute value of three differences is added, three difference sums are set to S.
To AYWithContinue assignment in the span of setting, obtain multiple coenvelope lines, the ripple of lower envelope line function
The theoretical amplitude value at peak, trough；
Calculate the theoretical amplitude value of multiple coenvelope lines, the crest of lower envelope line function, trough, respectively with coenvelope
Line, the crest of lower envelope line, the actual measurement range value of trough calculate, and obtain multiple S, when S is less than default difference value, by described
Each assignment of luminance component amplitude, chrominance component amplitude and colourity relative luminance delay determines the composite video signal
The bright gain inequality of color and the bright delay inequality of color, calculation formula are shown in formula (15), (16).
Embodiment three
Fig. 9 is the schematic diagram of triplex video signal quality index determining device of the embodiment of the present invention, as shown in figure 9, institute
Stating device includes：Acquisition module 31, the first determining module 32, the second determining module 33, the 3rd determining module 34 and the 4th determine
Module 35；Wherein,
The acquisition module 31, for obtaining the coenvelope line of composite video signal；
First determining module 32, for determining the first range value of the coenvelope line crest；
Second determining module 33, for according to first range value, determining brightness in the composite video signal
The span of component amplitude, and determine the span that colourity relative luminance is delayed in the composite video signal；
3rd determining module 34, for relative to the luminance component amplitude and colourity in corresponding span
Brightness delay difference assignment, the assignment is substituted into the luminance component amplitude, colourity relative luminance delay as variable
Coenvelope line function in, and determine substitute into assignment coenvelope line function crest the second range value；
4th determining module 35, for being less than preset value when second range value and the first range value difference
When, each assignment being delayed by the luminance component amplitude and the colourity relative luminance determines the color of the composite video signal
The bright bright delay inequality of gain inequality and color.
For becoming apparent from for explanation, modules will be elaborated respectively below：
The acquisition module 31, for obtaining the coenvelope line of composite video signal；
The composite video signal is standard signal to be tested, usually according to the RTL generations of composite video decoding chip
Code, the composite video signal simulated by analogue means, is data signal, can directly be acquired module 31 and obtain；Also may be used
Directly to be exported from composite video decoding chip, that is, can by CVBS signals that general analog television machine receives, it is necessary to
Module 31 can be just acquired by analog-digital commutator to obtain；
The acquisition of the coenvelope line is by the way that the peak point of the waveform of the composite video signal is connected to obtain
, specifically handled by application program, the application program is provided with specific algorithm, can automatically capture described
The peak point of composite video signal, then the tangent line tangent with the peak point is drawn, finally tangent line is smoothly connected, it is described
Application program is usually the video frequency signal processing application program installed in test main frame.
Specifically, the video processing applications program can be matrix labotstory (MATLAB, Matrix
Laboratory)。
First determining module 32, for determining the first range value of the coenvelope line crest；
According to relevant criterion, the concrete signal of the bright gain inequality of color and the bright delay inequality of color is 20T in test compound vision signal
Impulse waveform, the definition of 20T pulses, in the waveform of 20T pulses, when amplitude reaches the half of maximum, corresponding two
The distance between time point is 20T, and T is the time cycle；Specific to standard, for PAL, T 100ns；It is for NTSC, T
125ns。
In 20T pulses, colourity and luminance signal are Sine-squared ripples, and carrier chrominance signal is superimposed upon in luminance signal.
Fig. 2 is the 20T impulse waveforms in the present embodiment, and the π of ω=2 f, f are the carrier frequency of composite video signal.
In order to preferably observe 20T impulse waveforms, it is assumed that the frequency of the composite video signal tends to just infinite, so,
The envelope of composite video signal becomes apparent from, and is specifically shown in Fig. 3~Fig. 6, and Fig. 3~Fig. 6 is that chromatic component and luminance component are Bu Tong special
Four types of sign, wherein：
ACAnd AYThe respectively amplitude of chromatic component and luminance component,For the delay of colourity relative luminance.
Fig. 3 is characterized in：AC＞ AY,I.e. the amplitude of chromatic component is more than the amplitude of luminance component, and colourity is advanced
Brightness；
Fig. 4 is characterized in：AC＞ AY,I.e. the amplitude of chromatic component is more than the amplitude of luminance component, colourity hysteresis
Brightness；
Fig. 5 is characterized in：AC<AY,I.e. the amplitude of chromatic component is less than the amplitude of luminance component, and colourity is advanced
Brightness；
Fig. 6 is characterized in：AC<AY,I.e. the amplitude of chromatic component is less than the amplitude of luminance component, colourity hysteresis
Brightness；
Above-mentioned figure is characterized in what is obtained according to the shape qualitative analysis of envelope, and analysis method is people in the art
What member knew about, do not repeat.
Further, envelope in Fig. 3 is individually shown, obtains the envelope shown in Fig. 7.
First range value of the coenvelope line crest is the value of the M shown in Fig. 7, determine first range value be for
Luminance component amplitude and the span of colourity relative luminance delay in composite video signal are determined in subsequent step；
Determining the method for first range value can include：The peak point of the coenvelope line is obtained, measures the peak
It is worth the amplitude of point, obtains first range value, i.e., the value of the M shown in Fig. 7.
Second determining module 33, for according to first range value, determining brightness in the composite video signal
The span of component amplitude, and determine the span that colourity relative luminance is delayed in the composite video signal；
Obtain after first range value, it is necessary to establish luminance component amplitude, colourity in a composite video signal
The relational expression of component amplitude, the delay of colourity relative luminance and M, then determines therefrom that luminance component amplitude, colourity are relatively bright
The span of delay is spent, it is specifically as follows：
According to the principle of composite video signal, it is known that the colourity and brightness waveform of composite video signal are respectively Sine-squared
Ripple, therefore available AC、AYWithIt is expressed as the canonical function of the envelope of composite video signal as variable, specifically, in Fig. 7
Coenvelope line and lower envelope line are represented with following formulas (1), (2) respectively.
In above-mentioned two formula, CVBS_t is coenvelope line, and CVBS_b is lower envelope line, ACAnd AYRespectively chromatic component and bright
The amplitude of component is spent,For the delay of colourity relative luminance.
According to formula (1), it is assumed that the delay of colourity relative luminance is zero, i.e.,It can then obtain：M=Ay+Ac；
And Ac is Sine-squared, more than or equal to zero, so Ay is not more than M, therefore Ay span can be obtained
M is arrived for 0, i.e., the span of luminance component amplitude is zero to arrive first range value in described composite video signal；
The characteristics of from SIN function, in formula (1)Cycle is 2 π, andFor colourity relative luminance
Delay, it is possible to advanced, it is also possible to lag, therefore it is settableSpan be more than or equal to-π, and be less than or equal to
π,Span can be expressed as [- π, π].
3rd determining module 34, for relative to the luminance component amplitude and colourity in corresponding span
Brightness delay difference assignment, the assignment is substituted into the luminance component amplitude, colourity relative luminance delay as variable
Coenvelope line function in, and determine substitute into assignment coenvelope line function crest the second range value；
Specifically, for the difference that is delayed in corresponding span to the luminance component amplitude and colourity relative luminance
After assignment, the second range value of the crest of the function of the coenvelope line is can determine that, it is necessary to enter to the envelope canonical function
Line translation, obtain luminance component amplitude and the delay of colourity relative luminance and the relation of the second range value of the envelope crest
Formula；
Certainly, during assignment tentative calculation, it is also necessary to some other formula, it is clear in order to describe, it will first calculate
All formula used in journey are first derived one by one：
Notice that formula (1) has a maximum, and formula (2) has a maximum and minimum when working as ω t ∈ [0, π].
Therefore respectively to formula (1) and formula (2) to t derivations, formula (3) and formula (4) are obtained.
When formula (1) and formula (2) reach maximum value or minimum value, formula (3) and formula (4) are respectively equal to 0, obtain (5) and formula
(6)。
If the t for meeting formula (5) is tt, the t for meeting formula (6) is tb1And tb2；According to tb1And tb2Relation can obtain formula (7)：
With reference to Fig. 7, by tt、tb1、tb2Formula (1) and formula (2) are substituted into formula (7), obtains formula (8), (9), (10)：
Formula (9) is added to obtain formula (11) with formula (10)：
Then formula (12) is derived by by formula (5)：
Finally give formula (13)：
Similarly, formula (14) can be derived by by formula (6)：
After deriving above-mentioned formula, to AYWithAssignment is distinguished in span, is obtained accordingly with formula (11) according to assignment
AC；Try to achieve ACAfterwards, by AC、AYWithSubstitution formula (13) obtains ω tt；
The ω t that will be tried to achievetSubstitution formula (8), determines the second range value of the coenvelope line, that is, calculates the substitution
The maximum of the function of the coenvelope line of assignment, i.e. M ' value,
To AYWithContinue assignment in the span of setting, obtain the second range value of multiple coenvelope lines；
4th determining module 35, for being less than preset value when second range value and the first range value difference
When, each assignment being delayed by the luminance component amplitude and the colourity relative luminance determines the color of the composite video signal
The bright bright delay inequality of gain inequality and color.
When second range value and the first range value difference are less than preset value, pass through the luminance component amplitude
The bright gain inequality of the color of the composite video signal and the bright delay inequality of color are determined with each assignment of colourity relative luminance delay；
Specifically, calculated by formula (15), (16)：
The result that formula (15) is tried to achieve is the bright gain inequality of color, unit %；
The result that formula (16) is tried to achieve is the bright delay inequality of color, unit ns；If result of calculation is negative, illustrate that colourity lags,
If result of calculation is just, illustrate that colourity is advanced；
Wherein, N is constant, because being 20T pulses, it is the time cycle to take 20, T；Specific to standard, for PAL, T
For 100ns；For NTSC, T 125ns；
Default difference value is to be determined according to the requirement of composite video decoding chip, is not repeated.
Further, in order that result of calculation is more accurate, multiple waveforms can be extracted from composite video signal, are counted respectively
Calculate the bright gain inequality of color and the bright delay inequality of color；
Specifically, the respective coenvelope of the multiple composite video signal obtained respectively based on multiple composite video signals
Line, the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color are determined based on each coenvelope line respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color
More specifically, according to composite video signal principle, it is known that the waveform of 20T pulses be initial phase for zero degree, 90 degree,
180 degree, the four of 270 degree kinds of waveform cycles, wherein zero degree, 180 degree and 90 degree, 270 degree of shape is just the same, simply crest ripple
Paddy is in opposite direction, as long as therefore calculate the index of zero degree and 90 degree of both waveforms, and average, i.e.,：
The composite video signal for being zero according to initial phase, calculate the bright gain inequality of the first color and the bright delay inequality of the first color：
According to the composite video signal that initial phase is 90 degree, the bright gain inequality of the second color and the bright delay inequality of the second color are calculated；
The bright gain inequality of color is obtained according to the average value of the bright gain inequality of the first color and the bright gain inequality of the second color, it is bright according to the first color
The average value of delay inequality and the bright delay inequality of the second color obtains the bright delay inequality of color.
In actual applications, the acquisition module 31, the first determining module 32, the second determining module the 33, the 3rd determine mould
The determining module 35 of block 34 and the 4th can be believed by the central processing unit (CPU) positioned at test main frame, microprocessor (MPU), numeral
Number processor (DSP) or field programmable gate array (FPGA) etc. are realized.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the shape of the embodiment in terms of the present invention can use hardware embodiment, software implementation or combination software and hardware
Formula.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more to use storage
The form for the computer program product that medium is implemented on (including but is not limited to magnetic disk storage and optical memory etc.).
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., it should be included in the protection of the present invention
Within the scope of.
Claims (12)
1. a kind of composite video signal quality index determines method, it is characterised in that methods described includes：
The coenvelope line of composite video signal is obtained, determines the first range value of the coenvelope line crest；
According to first range value, the span of luminance component amplitude in the composite video signal is determined, and determines institute
State the span that colourity relative luminance is delayed in composite video signal；
To the luminance component amplitude and colourity relative luminance delay difference assignment in corresponding span, by the assignment
Substitute into and determine to substitute into in the coenvelope line function of variable with the luminance component amplitude, colourity relative luminance delay
Second range value of the crest of the function of the coenvelope line of assignment；
When second range value and the first range value difference are less than preset value, pass through the luminance component amplitude and institute
Each assignment for stating the delay of colourity relative luminance determines the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
2. according to the method for claim 1, it is characterised in that the coenvelope line for obtaining composite video signal, including：
The peak point in the composite video signal each cycle is obtained, connects the peak point, forms coenvelope line.
3. according to the method for claim 2, it is characterised in that first amplitude for determining the coenvelope line crest
Value, including：
The peak point of the coenvelope line is obtained, measures the amplitude of the peak point, obtains first range value.
4. according to the method for claim 1, it is characterised in that described to determine luminance component width in the composite video signal
The span of degree, including：
According to first range value, the span for determining luminance component amplitude in the composite video signal is zero described in
First range value；
The span for determining that colourity relative luminance is delayed in the composite video signal, including：
The scope that colourity relative luminance is delayed in the composite video signal is more than or equal to-π, and is less than or equal to π.
5. according to the method for claim 1, it is characterised in that the ripple for determining to substitute into the function of the coenvelope line of assignment
Second range value at peak, including；
The function of coenvelope line based on the substitution assignment, calculate the maximum of the function of the coenvelope line for substituting into assignment
Value, is defined as second range value by the maximum calculated.
6. according to the method for claim 1, it is characterised in that methods described also includes；
The respective coenvelope line of the multiple composite video signal obtained respectively based on multiple composite video signals, on each
Envelope determines the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
7. a kind of composite video signal quality index determining device, it is characterised in that described device includes acquisition module, first true
Cover half block, the second determining module, the 3rd determining module and the 4th determining module；Wherein,
The acquisition module, for obtaining the coenvelope line of composite video signal；
First determining module, for determining the first range value of the coenvelope line crest；
Second determining module, for according to first range value, determining luminance component width in the composite video signal
The span of degree, and determine the span that colourity relative luminance is delayed in the composite video signal；
3rd determining module, for prolonging in corresponding span to the luminance component amplitude and colourity relative luminance
When distinguish assignment, by the assignment substitute into the luminance component amplitude, the colourity relative luminance delay for variable upper bag
In winding thread function, and determine to substitute into the second range value of the crest of the function of the coenvelope line of assignment；
4th determining module, for when second range value is less than preset value with the first range value difference, leading to
Each assignment for crossing the luminance component amplitude and colourity relative luminance delay determines the bright increasing of the color of the composite video signal
Beneficial difference and the bright delay inequality of color.
8. device according to claim 7, it is characterised in that the acquisition module is additionally operable to：
The peak point in the composite video signal each cycle is obtained, connects the peak point, forms coenvelope line.
9. device according to claim 8, it is characterised in that first determining module is additionally operable to：
The peak point of the coenvelope line is obtained, measures the amplitude of the peak point, obtains first range value.
10. device according to claim 7, it is characterised in that second determining module is additionally operable to：
According to first range value, the span for determining luminance component amplitude in the composite video signal is zero described in
First range value；
Second determining module is additionally operable to determine the span that colourity relative luminance is delayed in the composite video signal：Institute
It is more than or equal to-π to state the scope that colourity relative luminance in composite video signal is delayed, and is less than or equal to π.
11. device according to claim 7, it is characterised in that the 3rd determining module is additionally operable to：
The function of coenvelope line based on the substitution assignment, calculate the maximum of the function of the coenvelope line for substituting into assignment
Value, is defined as second range value by the maximum calculated.
12. device according to claim 7, it is characterised in that the 4th determining module is additionally operable to：
The respective coenvelope line of the multiple composite video signal obtained respectively based on multiple composite video signals, on each
Envelope determines the bright gain inequality of the respective color of the multiple composite video signal and the bright delay inequality of color respectively；
The bright gain inequality of multiple colors and the bright delay inequality of color are averaged respectively respectively；
Using the average value as the bright gain inequality of the color of the composite video signal and the bright delay inequality of color.
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| CN102547309A (en) * | 2011-11-24 | 2012-07-04 | 苏州希图视鼎微电子有限公司 | Detection calculating method and device for frequency shift of composite video broadcast signal (CVBS) |
| CN104320655A (en) * | 2014-11-11 | 2015-01-28 | 杭州士兰微电子股份有限公司 | Video decoding chip testing device and method |
| WO2016078262A1 (en) * | 2014-11-19 | 2016-05-26 | 深圳市中兴微电子技术有限公司 | Measurement method and apparatus for composite video broadcast signal quality and storage medium |
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Application publication date: 20180116 Assignee: Xi'an Chris Semiconductor Technology Co. Ltd. Assignor: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Contract record no.: 2019440020036 Denomination of invention: Method and device for determining quality index of composite video signal Granted publication date: 20190430 License type: Common License Record date: 20190619 |