CN106034239A - Coding method and apparatus for composite video broadcast signal - Google Patents
Coding method and apparatus for composite video broadcast signal Download PDFInfo
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- CN106034239A CN106034239A CN201510106629.9A CN201510106629A CN106034239A CN 106034239 A CN106034239 A CN 106034239A CN 201510106629 A CN201510106629 A CN 201510106629A CN 106034239 A CN106034239 A CN 106034239A
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Abstract
The invention, which relates to the video image processing field, discloses a coding method and apparatus for a composite video broadcast signal. The method comprises: pretreatment is carried out on a brightness signal needing coding and a chroma signal needing coding, wherein the pretreatment includes steps of carrying out brightness comb filtering on the brightness signal needing coding and/or carrying out chroma comb filtering on the chroma signal needing coding; and according the brightness signal and the chroma signal after pretreatment, a composite video broadcast signal is generated. According to the invention, before the composite video broadcast signal is generated, comb filtering is carried out on the brightness signal needing coding and/or chroma signal needing coding, so that a brightness-chroma crosstalk that is caused because a brightness signal is inserted into a chroma spectrum or a chroma signal is insertd into a brightness spectrum can be eliminated automatically, efficiently, and completely.
Description
Technical field
The present invention relates to field of video image processing, particularly to composite video signal coded method and
Device.
Background technology
Composite video signal (" Composite Video Broadcast Signal " is called for short " CVBS "),
Namely from composite video signal, isolate the video signal after sound accompaniment, it is that one is widely used in signal volume
Code, the video standard transmitting and storing, the common coded system of composite video signal has TSC-system formula
(National Television Standards Committee), pal mode (Phase Alternating
Line), during coding, composite video signal is the colourity after being modulated by chrominance carrier and brightness is added
Obtain.
Owing to the luminance spectrum in composite video signal exists substantial amounts of white space near even-order harmonic,
So the frequency spectrum of carrier chrominance signal to be moved on to by the method for modulation the white space of luminance signal frequency spectrum, it is achieved
Put between the frequency spectrum of colour difference signal Yu the frequency interlace of luminance signal, referred to as frequency spectrum.
Definition according to composite video signal international standard: NTSC is near luminance spectrum 3.58MHz
The region of ± 1.3MHz uses the method put between frequency spectrum to add chrominance spectrum signal, and total frequency band is 4.2MHz；
PAL near luminance spectrum 4.43MHz ± region of 1.3MHz uses the method put between frequency spectrum to add color
Degree spectrum signal, total frequency band is 6MHz.
If the high-frequency information of luminance signal vertical direction enriches, between will going here and there on frequency spectrum, the mode of putting is divided
In the region of dispensing chrominance spectrum, the high fdrequency component of same carrier chrominance signal also can be put between going here and there on frequency spectrum
In luminance spectrum, this influencing each other is known as bright color crosstalk.Just because of this reason, so decoding end
It is difficult to separate the cleanest for luminance and chrominance information, all can have the composition of crosstalk.
Great majority weaken the impact of this bright color crosstalk at present is all to use more preferable light tone to divide when decoding
From method, the key place that traditional method is not pinpointed the problems: composite video signal exists at coding side
Brightness and chrominance spectrum go here and there problem mutually, and due in CVBS signal luminance signal and carrier chrominance signal at some
Frequency band exists simultaneously, and decoding end can not be totally separated from out luminance signal and carrier chrominance signal, light tone string
Disturb phenomenon the most clearly.
Summary of the invention
It is an object of the invention to provide coded method and the device thereof of a kind of composite video signal, from root
Upper removal because of in luminance signal string to chrominance spectrum or carrier chrominance signal string to luminance spectrum and the light tone caused
Crosstalk.
For solving above-mentioned technical problem, embodiments of the present invention disclose the volume of a kind of composite video signal
Code method, comprises the following steps:
To needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pretreatment, this pretreatment bag
Include: the luminance signal needing coding is carried out brightness comb filtering, and/or, to the colourity letter needing coding
Number carry out colourity comb filtering；
Composite video signal is generated according to pretreated luminance signal and carrier chrominance signal.
Embodiments of the present invention also disclose the code device of a kind of composite video signal, including to place an order
Unit:
Pretreatment unit, for needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pre-
Processing, this pretreatment unit includes: brightness comb filtering subelement, for the brightness letter needing coding
Number carry out brightness comb filtering, and/or, colourity comb filtering subelement, for the colourity needing coding
Signal carries out colourity comb filtering；
Composite video signal signal generating unit, for generating according to pretreated luminance signal and carrier chrominance signal
Composite video signal.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
The present invention is generating before composite video signal, coding side to need coding luminance signal and/
Or need the carrier chrominance signal of coding to carry out comb filtering, it is possible to automatically and remove because of bright from root efficiently
The bright color crosstalk caused during degree train of signal is to chrominance spectrum or carrier chrominance signal string to luminance spectrum.
Further, in conjunction with brightness boundary information, colourity boundary information and preset boundary threshold value control whether
Carry out comb filtering, luminance signal and carrier chrominance signal will not be produced the situation of crosstalk, do not use pectination to filter
Ripple, it is possible to effectively reduce the workload of Filtering Processing.
Further, the luminance signal needing coding is carried out in the step of brightness comb filtering, first to bright
Degree signal carries out bandpass filtering, then bandpass signal is carried out brightness comb filtering, and bandpass filtering avoids right
Impact with the signal outside passband rate.
Accompanying drawing explanation
Fig. 1 is the flow process signal of the coded method of a kind of composite video signal in first embodiment of the invention
Figure；
Fig. 2 is the flow process signal of the coded method of a kind of composite video signal in second embodiment of the invention
Figure；
Fig. 3 is the implementing procedure figure of preference in third embodiment of the invention；
Fig. 4 is the structural representation of the code device of a kind of composite video signal in four embodiment of the invention
Figure；
Fig. 5 is that in sixth embodiment of the invention, the compound of bright color crosstalk cancellation module that increase of preference regards
Frequently the structural schematic block diagram of Signal coding end；
Fig. 6 is the structural representation of the bright color crosstalk cancellation module of preference in sixth embodiment of the invention
Figure.
Detailed description of the invention
In the following description, many technology are proposed in order to make reader be more fully understood that the application thin
Joint.But, even if it will be understood by those skilled in the art that do not have these ins and outs and based on
The many variations of following embodiment and amendment, it is also possible to realize the required guarantor of each claim of the application
The technical scheme protected.
Term is explained:
Bright color crosstalk: if the high-frequency information of luminance signal vertical direction enriches, between will going here and there on frequency spectrum
The mode of putting is distributed in the region of chrominance spectrum, and the high fdrequency component of same carrier chrominance signal also can be gone here and there on frequency spectrum
In a luminance spectrum put, this influencing each other is known as bright color crosstalk.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this
Bright embodiment is described in further detail.
First embodiment of the invention relates to the coded method of a kind of composite video signal, and Fig. 1 is that this is combined
The schematic flow sheet of the coded method of video signal.
Specifically, as it is shown in figure 1, the coded method of this composite video signal comprises the following steps:
Step 101, to needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pretreatment,
This pretreatment includes: the luminance signal of needs coding is carried out brightness comb filtering, and/or, needs are compiled
The carrier chrominance signal of code carries out colourity comb filtering.
Step 102, generates composite video signal according to pretreated luminance signal and carrier chrominance signal.
It is appreciated that step 101 to carry out during pretreatment and contains three kinds of situations, i.e. only to needing coding
Luminance signal carries out brightness comb filtering, or only the carrier chrominance signal needing coding is carried out colourity pectination filter
Ripple, or the luminance signal needing coding is carried out brightness comb filtering simultaneously and to the colourity needing coding
Signal carries out colourity comb filtering.
Correspondingly, step 102 generates composite video letter according to pretreated luminance signal and carrier chrominance signal
Number time, luminance signal and carrier chrominance signal both can be all through the signal of comb filtering, it is also possible to be
Part is through the signal of comb filtering.
Present embodiment is before generating composite video signal, in the coding side luminance signal to needing coding
And/or need the carrier chrominance signal of coding to carry out comb filtering, it is possible to automatically and efficiently remove from root because of
During luminance signal string is to chrominance spectrum or carrier chrominance signal string to luminance spectrum and the bright color crosstalk caused.
Second embodiment of the invention relates to the coded method of a kind of composite video signal, and Fig. 2 is that this is combined
The schematic flow sheet of the coded method of video signal.
Second embodiment is improved on the basis of the first embodiment, and main improvements exist
In: combine whether brightness boundary information, colourity boundary information and preset boundary threshold value control carry out pectination filter
Ripple, will not produce the situation of crosstalk, not use comb filtering, it is possible to have luminance signal and carrier chrominance signal
Effect reduces the workload of Filtering Processing.Specifically:
In a step 101, including following sub-step:
Step 201, extracts the brightness boundary information of the luminance signal needing coding and needs the colourity of coding
The colourity boundary information of signal.
In the present embodiment, it is possible to use border detection wave filter extracts brightness boundary information and colourity limit
Boundary's information, conventional border detection wave filter has Canny operator, Sobel operator, Laplacian to calculate
Son etc..
Step 202, according to the brightness boundary information extracted, colourity boundary information and default first bright
Degree boundary threshold and the first colourity boundary threshold preset, control whether that the luminance signal to needing coding is entered
Row comb filtering.
Step 203, according to the colourity boundary information extracted, brightness boundary information and the second default color
Degree boundary threshold and the second brightness boundary threshold preset, control whether that the carrier chrominance signal to needing coding is entered
Row comb filtering.
It should be noted that the order between above-mentioned steps 202 and step 203 is not defined, it
Both can successively perform, it is also possible to executed in parallel.Can be carried out, it is also possible to only carry out step 202
Or only carry out step 203.
Furthermore, it is to be understood that in other embodiments of the present invention, the step that above-mentioned boundary threshold judges
Rapid it is not necessary to, all luminance signals and carrier chrominance signal all can be carried out comb filtering.
In addition it is also possible to after all luminance signals and carrier chrominance signal all carry out comb filtering, according to extraction
Brightness boundary information and colourity boundary information, and preset brightness boundary threshold and preset colourity limit
Boundary's threshold value, is to use the luminance signal after comb filtering and colourity letter when determining and generate composite video signal
Number, or use the luminance signal without comb filtering and carrier chrominance signal being originally inputted.
Whether present embodiment combines brightness boundary information, colourity boundary information and preset boundary threshold value control
Carry out comb filtering, luminance signal and carrier chrominance signal will not be produced the situation of crosstalk, do not use pectination to filter
Ripple, it is possible to effectively reduce the workload of Filtering Processing.
Third embodiment of the invention relates to the coded method of a kind of composite video signal, the 3rd embodiment
Improved on the basis of the first embodiment, mainly theed improvement is that:
First, " luminance signal needing coding is carried out brightness comb filtering " at above-mentioned first embodiment
Step in, including following sub-step:
The luminance signal needing coding is carried out bandpass filtering, obtains frequency centered by chrominance subcarrier frequency
The band information of each 1.3MHz in left and right of rate；
To the frequency of each 1.3MHz in the left and right of frequency centered by chrominance subcarrier frequency obtained after bandpass filtering
Wide band information carries out comb filtering.
The above-mentioned luminance signal to needing coding carries out in the step of brightness comb filtering, first to luminance signal
Carrying out bandpass filtering, the band obtained leads to a luminance signal (i.e. left side for frequency centered by chrominance subcarrier frequency
The band information of right each 1.3MHz) it is easy and the part of carrier chrominance signal generation crosstalk, this part is entered
Row brightness comb filtering, remainder (such as low-passing part) does not the most carry out brightness comb filtering, because of
This, bandpass filtering avoids and impacts the signal outside band passband rate.
In the step that above-mentioned first embodiment " carries out colourity comb filtering to the carrier chrominance signal needing coding "
In Zhou, including following sub-step:
The carrier chrominance signal needing coding is carried out comb filtering at the frequency band of positive and negative 1.3MHz.
Wherein, according to comb filtering principle, under various standards, the time-domain calculation method of comb filtering is: frequently
Territory carries out comb filtering, has only to after the second row, one's own profession before time domain one's own profession, one's own profession for pal mode
This three row information of second row is added；TSC-system formula is needed time domain one's own profession, one's own profession previous row, basis
After row, this three row information of a line is added.Note that the position gone here is arrangement on the field, for frame
Up position needs to be multiplied by 2.
To luminance signal near chrominance carrier ± band information of 1.3MHz carries out comb filtering, only need
Three row of being correlated with its time domain are added.
The frequency band of carrier chrominance signal ± 1.3MHz is carried out comb filtering, pal mode is had only to time domain
Before one's own profession, one's own profession, after the second row, one's own profession, this three row information of the second row is added；TSC-system formula is needed
This three row information of a line after time domain one's own profession, one's own profession previous row, one's own profession is added.
Secondly, it is preferable that in step 101 carries out the step of pretreatment, following sub-step is also included:
Extracting the luma residual signal in the luminance signal needing coding, wherein luma residual signal refers to not
Luminance signal in the range of each 1.3MHz in the left and right of frequency centered by chrominance subcarrier frequency；
By luma residual signal and through comb filtering luminance signal be added, believe as pretreated brightness
Number.
Furthermore, it is to be understood that luma residual signal can use luminance signal (the i.e. brightness needing coding
Input signal) deduct the luminance signal after bandpass filtering, can also be obtained by brightness band elimination filter simultaneously
Arrive.
Finally, it is preferable that in a step 102, including following sub-step:
The international standard produced according to composite video signal, believes luminance signal and the colourity through pretreatment
Number, increase field synchronization and field blanking signal, and determine the phase place of often row chrominance synchronization signal.
As the preference of present embodiment, it is embodied as example flow chart as shown in Figure 3.
Step 301, signal input.Input data are split as luminance input signal and chrominance input signal,
Subsequent step needs separately to process brightness and colourity.
Step 302, brightness bandpass filtering.For extract luminance signal near chrominance carrier ± 1.3MHz
Band information.
Step 303, brightness comb filtering.Labelling this behavior row k, PAL uses kth-2, k, k+2
The output of the brightness bandpass filtering unit of three row is done averagely, it is also possible to arranges three row weights and is added.NTSC
Use kth-1, k, k+1 tri-the output of brightness bandpass filtering unit of row be multiplied by often row respective weights and be added.
Step 304, brightness Boundary Extraction.Border detection wave filter is used to obtain brightness coboundary information
Intensity, judges for boundary threshold.
Step 305, colourity Boundary Extraction.Border detection wave filter is used to obtain colourity coboundary information
Intensity, judges for boundary threshold.
Step 306, boundary threshold judge.Determine bright according to brightness boundary intensity and colourity boundary intensity
Degree control information and colourity control information.
Concrete rule is:
If brightness boundary intensity is more than the first brightness boundary threshold, colourity boundary intensity is more than the first colourity
Boundary threshold, brightness control signal is 1, is otherwise 0；
If brightness boundary intensity is more than the second brightness boundary threshold, colourity boundary intensity is more than the second colourity
Boundary threshold, colourity control signal is 1, is otherwise 0.
Step 307, colourity comb filtering.Labelling this behavior row k, PAL uses kth-2, k, k+2
Three row chrominance input signal are multiplied by often row respective weights and are added.NTSC uses kth-1, k, k+1 tri-row
Chrominance input signal be multiplied by often row respective weights be added.
Step 308, brightness output select.According to brilliance control information select luminance output signal be through
Cross the result of brightness comb filtering or original luminance input signal.
The output of step 309, colourity selects.According to colourity control information select chrominance output signal be through
Cross the result of colourity comb filtering or original chrominance input signal.
Step 310, signal export.Luminance output signal and chrominance output signal are merged, is used for
Other subsequent module.
The each method embodiment of the present invention all can realize in modes such as software, hardware, firmwares.No matter
The present invention is to realize with software, hardware or firmware mode, and instruction code may be stored in any class
In the addressable memorizer of computer of type (the most permanent or revisable, volatibility or non-
Volatibility, solid-state or non-solid, fixing or removable medium etc.).Equally,
Memorizer can e.g. programmable logic array (Programmable Array Logic, be called for short
" PAL "), random access memory (Random Access Memory, be called for short " RAM "),
Programmable read only memory (Programmable Read Only Memory is called for short " PROM "),
Read only memory (Read-Only Memory is called for short " ROM "), electrically erasable are read-only
Memorizer (Electrically Erasable Programmable ROM is called for short " EEPROM "),
Disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") etc..
Four embodiment of the invention relates to the code device of a kind of composite video signal, and Fig. 4 is that this is combined
The structural representation of the code device of video signal.
Specifically, as shown in Figure 4, the code device of this composite video signal includes with lower unit:
Pretreatment unit, for needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pre-
Processing, this pretreatment unit includes: brightness comb filtering subelement, for the brightness letter needing coding
Number carry out brightness comb filtering, and/or, colourity comb filtering subelement, for the colourity needing coding
Signal carries out colourity comb filtering；
Composite video signal signal generating unit, for generating according to pretreated luminance signal and carrier chrominance signal
Composite video signal.
Furthermore, it is to be understood that pretreatment unit is arranged after signal of being expert at generates and before field signal generation,
The scope of protection of the invention is broadly fallen into simultaneously for the situation being arranged on any position of coding side.
Present embodiment is before generating composite video signal, in the coding side luminance signal to needing coding
And/or need the carrier chrominance signal of coding to carry out comb filtering, it is possible to automatically and efficiently remove from root because of
During luminance signal string is to chrominance spectrum or carrier chrominance signal string to luminance spectrum and the bright color crosstalk caused.
First embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be with
First embodiment is worked in coordination enforcement.The relevant technical details mentioned in first embodiment is in this enforcement
In mode still effectively, in order to reduce repetition, repeat no more here.Correspondingly, present embodiment carries
To relevant technical details be also applicable in the first embodiment.
Fifth embodiment of the invention relates to the code device of a kind of composite video signal, the 5th embodiment
Improved on the basis of the 4th embodiment, mainly theed improvement is that: combined brightness border letter
Breath, whether colourity boundary information and preset boundary threshold value control carry out comb filtering, to luminance signal and color
Degree signal will not produce the situation of crosstalk, does not use comb filtering, it is possible to effectively reduces the work of Filtering Processing
Measure.Specifically:
Pretreatment unit includes following subelement:
Boundary information extract subelement, for extract need coding luminance signal brightness boundary information and
Need the colourity boundary information of the carrier chrominance signal of coding；
Brightness comb filtering controls subelement, and for according to the brightness boundary information extracted, colourity border is believed
Breath and the first brightness boundary threshold preset and the first colourity boundary threshold preset, control whether needing
Luminance signal to be encoded carries out comb filtering；
Colourity comb filtering controls subelement, and for according to the colourity boundary information extracted, brightness border is believed
Breath and the second brightness boundary threshold preset and the second colourity boundary threshold preset, control whether needing
Carrier chrominance signal to be encoded carries out comb filtering.
Second embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be with
Second embodiment is worked in coordination enforcement.The relevant technical details mentioned in second embodiment is in this enforcement
In mode still effectively, in order to reduce repetition, repeat no more here.Correspondingly, present embodiment carries
To relevant technical details be also applicable in the second embodiment.
Sixth embodiment of the invention relates to the code device of a kind of composite video signal, the 6th embodiment
Improved on the basis of the 4th embodiment, mainly theed improvement is that:
First, brightness comb filtering subelement includes following subelement:
Bandpass filtering subelement, for the luminance signal needing coding is carried out bandpass filtering, obtains with color
The band information of each 1.3MHz in left and right of frequency centered by degree subcarrier frequency；
The first comb filtering subelement, for obtain after bandpass filtering with chrominance subcarrier frequency being
The band information of left and right each 1.3MHz frequency range of frequency of heart carries out comb filtering.
Correspondingly, in colourity comb filtering subelement, including following subelement:
Second comb filtering subelement, for the carrier chrominance signal frequency at positive and negative 1.3MHz needing coding
Band carries out comb filtering.
Secondly, it is preferable that in pretreatment unit, following subelement is also included:
Luma residual extracts subelement, for extracting the luma residual letter in the luminance signal needing coding
Number, luma residual signal refers to not at each 1.3MHz in the left and right of frequency centered by chrominance subcarrier frequency
In the range of luminance signal；
Adder subelement, for by luma residual signal and through comb filtering luminance signal be added, make
For pretreated luminance signal.
Furthermore, it is to be understood that luma residual signal can use luminance signal (the i.e. brightness needing coding
Input signal) deduct the luminance signal after bandpass filtering, can also be obtained by brightness band elimination filter simultaneously
Arrive.
Finally, it is preferable that in composite video signal signal generating unit, including following subelement:
Composite video signal generates subelement, the international standard produced according to composite video signal, increases field
Synchronize and field blanking signal, and determine the phase place of often row chrominance synchronization signal.
3rd embodiment is the method embodiment corresponding with present embodiment, and present embodiment can be with
3rd embodiment is worked in coordination enforcement.The relevant technical details mentioned in 3rd embodiment is in this enforcement
In mode still effectively, in order to reduce repetition, repeat no more here.Correspondingly, present embodiment carries
To relevant technical details be also applicable in the 3rd embodiment.
It is the composite video increasing bright color crosstalk cancellation module as the preference of present embodiment, such as Fig. 5
The structural schematic block diagram of Signal coding end.As it is shown in figure 5, increase bright color crosstalk cancellation module at coding side,
In addition to bright color crosstalk cancellation module, other parts are conventional composite video signal coding block diagrams, here
Bright color crosstalk cancellation module is placed after signal of being expert at generates and (i.e. figure is gone and synchronize to produce with horizontal blanking signal
After life) and field signal generate before (before i.e. in figure, field synchronization and field blanking signal produce), simultaneously
The model of present invention protection is broadly fallen into when bright color crosstalk cancellation module is placed on any position of coding side
Enclose.
Wherein, as shown in Figure 6, it includes 601 brightness bands to the structural representation of bright color crosstalk cancellation module
Pass filter unit, 602 brightness Interleaver Units, 603 luma residual signal extraction units, 604
Brightness outlet selector unit, 605 brightness Boundary Extraction unit, 606 colourity Boundary Extraction unit, 607
Boundary threshold judging unit, 608 colourity Interleaver Units, 609 colourity outlet selector unit.
Specifically:
601 brightness band-pass filter units, this unit is used for extracting luminance signal near chrominance carrier
The band information of ± 1.3MHz, and send output data to brightness Interleaver Unit.
602 brightness Interleaver Units, according to comb filtering principle, when frequency domain carries out comb filtering,
PAL is had only to be added this three row information of the second row after the second row, one's own profession before time domain one's own profession, one's own profession；
NTSC is needed to be added this three row information of a line after time domain one's own profession, one's own profession previous row, one's own profession.Please
Noting, the position gone here is arrangement on the field, needs to be multiplied by 2 for the position that frame is up.This list
Unit to luminance signal near chrominance carrier ± band information of 1.3MHz carries out comb filtering, it is only necessary to
Three row of being correlated with its time domain are added.
603 luma residual signal extraction units, this unit is used for extracting monochrome information not at chrominance carrier
The frequency domain of neighbouring ± 1.3MHz, simplest method uses luminance input signal to deduct the logical filter of brightness band exactly
Information after ripple device unit, the most also to using brightness band elimination filter mode to protect.
604 brightness outlet selector unit, the brightness control that this unit exports according to boundary threshold judging unit
Signal processed, selecting luminance output signal is the result through brightness comb filtering or original brightness input
Signal.
605 brightness Boundary Extraction unit, this unit uses border detection wave filter to extract brightness boundary information,
And send output data to boundary threshold judging unit.Conventional border detection wave filter has Canny to calculate
Son, Sobel operator, Laplacian operator etc..
606 colourity Boundary Extraction unit, this unit uses border detection wave filter to extract colourity boundary information,
And send output data to boundary threshold judging unit.
607 boundary threshold judging units, this unit is according to brightness Boundary Extraction information and colourity Boundary Extraction
The intensity of information, produces brightness control signal and colourity control signal.
If brightness boundary intensity is more than the first brightness boundary threshold, colourity boundary intensity is more than the first colourity
Boundary threshold, brightness control signal is 1, and luminance signal needs to carry out comb filtering, otherwise brilliance control
Signal is 0, and luminance signal need not do comb filtering.If brightness boundary intensity is more than the second brightness limit
Boundary's threshold value, colourity boundary intensity is more than the second colourity boundary threshold, and colourity control signal is 1, and colourity is believed
Number needs carry out comb filtering, and otherwise colourity control signal is 0, and carrier chrominance signal need not do comb filtering.
608 colourity Interleaver Units, this unit carries out pectination to the frequency band of carrier chrominance signal ± 1.3MHz
Filtering, has only to believe this three row of the second row after the second row, one's own profession before time domain one's own profession, one's own profession for PAL
Manner of breathing adds；NTSC is needed this three row information of a line after time domain one's own profession, one's own profession previous row, one's own profession
It is added.
609 colourity outlet selector unit, the colourity control that this unit exports according to boundary threshold judging unit
Signal processed, selecting chrominance output signal is the result through colourity comb filtering or the input of original colourity
Signal.
It should be noted that each unit mentioned in the present invention each equipment embodiment is all logical block,
Physically, a logical block can be a physical location, it is also possible to be the one of a physical location
Part, it is also possible to realize with the combination of multiple physical locations, the physics realization side of these logical blocks itself
Formula is not most important, and the combination of the function that these logical blocks are realized is only the solution present invention and is carried
The key of the technical problem gone out.Additionally, for the innovative part highlighting the present invention, the present invention is above-mentioned respectively to be set
The unit the closest with solving technical problem relation proposed by the invention is not drawn by standby embodiment
Entering, this is not intended that the said equipment embodiment does not exist other unit.
In sum, the present invention relates to luminance signal and the carrier chrominance signal of a kind of composite video signal coding side
The method and device that mutually crosstalk eliminates.Key issue for bright color crosstalk: composite video signal is being compiled
Code end exists for brightness and chrominance spectrum goes here and there problem mutually, and the present invention carries out bright color crosstalk elimination at coding side.
It is to say, The present invention gives a kind of method bright color crosstalk problem eliminated at coding side
And device, propose the mode using comb filtering to luminance signal near chrominance carrier ± 1.3MHz
The frequency band of frequency band and carrier chrominance signal ± 1.3MHz is filtered, in order to weaken and eliminate luminance signal and colourity
Signal cross-talk is to the intensity being allocated to square signal frequency range.Use brightness Boundary Extraction and colourity border simultaneously
Extract, judged by boundary threshold, luminance signal and carrier chrominance signal will not be crosstalked into and be allocated to the other side's letter
The situation of number frequency range, to luminance signal near chrominance carrier ± frequency band of 1.3MHz and carrier chrominance signal
The frequency band of ± 1.3MHz does not use comb filtering, otherwise uses comb filtering.
It should be noted that in the claim and description of this patent, such as the first and second grades it
The relational terms of class is used merely to separate an entity or operation with another entity or operating space,
And not necessarily require or imply and there is the relation of any this reality or suitable between these entities or operation
Sequence.And, term " includes ", " comprising " or its any other variant are intended to nonexcludability
Comprise, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process,
The key element that method, article or equipment are intrinsic.In the case of there is no more restriction, by statement " bag
Include one " key element that limits, it is not excluded that including the process of described key element, method, article or setting
Other identical element is there is also in Bei.
Although by referring to some of the preferred embodiment of the invention, the present invention has been shown and
Describe, but it will be understood by those skilled in the art that and can in the form and details it be made respectively
Plant and change, without departing from the spirit and scope of the present invention.
Claims (10)
1. the coded method of a composite video signal, it is characterised in that comprise the following steps:
To needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pretreatment, this pretreatment bag
Include: the luminance signal needing coding is carried out brightness comb filtering, and/or, to the colourity needing coding
Signal carries out colourity comb filtering；
Composite video signal is generated according to luminance signal and the carrier chrominance signal through described pretreatment.
The coded method of composite video signal the most according to claim 1, it is characterised in that
In the step of described " to needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pretreatment ",
Including following sub-step:
Extract brightness boundary information and the colourity of described needs coding of the described luminance signal needing coding
The colourity boundary information of signal；
Brightness boundary information according to described extraction, colourity boundary information and the first default brightness border
Threshold value and the first colourity boundary threshold preset, control whether to carry out the described luminance signal needing coding
Comb filtering；And/or, according to the colourity boundary information of described extraction, brightness boundary information and presetting
The second colourity boundary threshold and preset the second brightness boundary threshold, control whether to described need coding
Carrier chrominance signal carry out comb filtering.
The coded method of composite video signal the most according to claim 1, it is characterised in that
In the step of described " luminance signal needing coding is carried out brightness comb filtering ", including following sub-step
Rapid:
The described luminance signal needing coding is carried out bandpass filtering, in obtaining with chrominance subcarrier frequency being
The band information of each 1.3MHz in left and right of frequency of heart；
To the left and right of frequency each 1.3 centered by chrominance subcarrier frequency obtained after described bandpass filtering
The band information of MHz frequency range carries out comb filtering；
Described " to need coding carrier chrominance signal carry out colourity comb filtering " step in, including with
Lower sub-step:
The described carrier chrominance signal needing coding is carried out comb filtering at the frequency band of positive and negative 1.3MHz.
The coded method of composite video signal the most according to claim 3, it is characterised in that
In the step of described " to needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pretreatment ",
Also include following sub-step:
Extracting the luma residual signal in the described luminance signal needing coding, described luma residual signal is
Refer to the luminance signal not in the range of each 1.3MHz in the left and right of frequency centered by chrominance subcarrier frequency；
Described luma residual signal and the described luminance signal through comb filtering are added, pre-as described warp
The luminance signal processed.
The coded method of composite video signal the most according to any one of claim 1 to 4, its
It is characterised by, " generates composite video according to luminance signal and the carrier chrominance signal through described pretreatment described
Signal " step in, including following sub-step:
To through the luminance signal of pretreatment and carrier chrominance signal, increase field synchronization and field blanking signal, and
Determine the phase place of often row chrominance synchronization signal.
6. the code device of a composite video signal, it is characterised in that include with lower unit:
Pretreatment unit, for needing the luminance signal of coding and needing the carrier chrominance signal of coding to carry out pre-
Processing, this pretreatment unit includes: brightness comb filtering subelement, for the brightness letter needing coding
Number carry out brightness comb filtering, and/or, colourity comb filtering subelement, for the color needing coding
Degree signal carries out colourity comb filtering；
Composite video signal signal generating unit, for according to through the luminance signal of described pretreatment and carrier chrominance signal
Generate composite video signal.
The code device of composite video signal the most according to claim 6, it is characterised in that institute
State pretreatment unit and include following subelement:
Boundary information extracts subelement, for extracting the brightness border letter of the described luminance signal needing coding
Breath and the colourity boundary information of the described carrier chrominance signal needing coding；
Brightness comb filtering controls subelement, for the brightness boundary information according to described extraction, colourity limit
Boundary's information and the first default brightness boundary threshold and the first colourity boundary threshold preset, control whether
The described luminance signal needing coding is carried out comb filtering；
Colourity comb filtering controls subelement, for the colourity boundary information according to described extraction, brightness limit
Boundary's information and the second default brightness boundary threshold and the second colourity boundary threshold preset, control whether
The described carrier chrominance signal needing coding is carried out comb filtering.
The code device of composite video signal the most according to claim 6, it is characterised in that institute
State brightness comb filtering subelement and include following subelement:
Bandpass filtering subelement, for the described luminance signal needing coding is carried out bandpass filtering, obtains
The band information of each 1.3MHz in the left and right of frequency centered by chrominance subcarrier frequency；
First comb filtering subelement, for obtain after described bandpass filtering with chrominance subcarrier frequency
Centered by the band information of left and right each 1.3MHz frequency range of frequency carry out comb filtering；
In described colourity comb filtering subelement, including following subelement:
Second comb filtering subelement, for needing the carrier chrominance signal of coding at positive and negative 1.3MHz to described
Frequency band carry out comb filtering.
The code device of composite video signal the most according to claim 8, it is characterised in that
In described pretreatment unit, also include following subelement:
Luma residual extracts subelement, for extracting the luma residual in the described luminance signal needing coding
Signal, described luma residual signal refers to not each in the left and right of frequency centered by chrominance subcarrier frequency
Luminance signal in the range of 1.3MHz；
Adder subelement, for by described luma residual signal and the described luminance signal through comb filtering
It is added, as described pretreated luminance signal.
10. according to the code device of the composite video signal according to any one of claim 6 to 9,
It is characterized in that, in described composite video signal signal generating unit, including following subelement:
Composite video signal generates subelement, for through the luminance signal of pretreatment and carrier chrominance signal,
Increase field synchronization and field blanking signal, and determine the phase place of often row chrominance synchronization signal.
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