CN100340120C - Multi-frame brightness/chroma separation method - Google Patents
Multi-frame brightness/chroma separation method Download PDFInfo
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- CN100340120C CN100340120C CNB200310110400XA CN200310110400A CN100340120C CN 100340120 C CN100340120 C CN 100340120C CN B200310110400X A CNB200310110400X A CN B200310110400XA CN 200310110400 A CN200310110400 A CN 200310110400A CN 100340120 C CN100340120 C CN 100340120C
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Abstract
The present invention relates to a brightness/chroma separating method for a plurality of picture frames, which comprises the procedures that composite color television signals are firstly sampled to obtain and temporarily store a plurality of sample data FmP<x, y>, wherein FmP<x, y> represents the sample data of a y picture element in an x row of an m picture frame in the composite color television signals, and m, x and y are positive integers greater than or equal to zero; secondly, a plurality of brightness data Y<x, y> are calculated by F<m+1>P<x, y>, F<m>P<x, y>, F<m-1>P<x, y> and F<m-2>P<x, y>, wherein Y<x, y> represents the brightness data of the y picture element in the x row; finally, a plurality of chroma data C<x, y> are calculated and obtained by F<m+1>P<x, y>, F<m>P<x, y>, F<m-1>P<x, y> and F<m-2>P<x, y>, wherein C<x, y> represents the chroma data of the y picture element in the x row. The present invention has the advantages of noise tolerance enhancement, and accurate brightness data and chroma data separation. As far as a PAL system is concerned, errors caused by phase angle differences among all the picture frames can be just mutually offset so that the PAL system can also apply the brightness/chroma separating technique for a plurality of picture frames, and thereby, the present invention is suitable for practical use.
Description
Technical field
The present invention relates to the method for a kind of three-dimensional video decoding (3D video decoder), particularly relate to and a kind ofly can improve the noise tolerance, accurately separating luminance data and chroma data.For the PAL system, the error that phase angle difference caused more can allow between each picture frame because just can mutually offset, make the PAL system also can use the technology that many picture frames brightness/chroma is separated, thereby be suitable for the method (A METHODOF INTER-FRAME Y/C SEPARATION) that practical many picture frames brightness/chroma is separated (inter-frame Y/C separation) more.
In the modern life, people have not needed to go out promptly can see many things.Television set for example, people can be sent to television set in the family with pictures such as landscape, media event, theatrical performances by TV station; Or community's surveillance, people can watch that monitor picture can see through video camera and know the outside situation in the family.Above-mentioned various video-signal systems respectively have different functions and purpose, but must send video signal to recipient from transmit leg.
Color is made up of red (R), green (G), blue (B) three primary colors, therefore directly perceived on the transmit leg tendency to develop send video pictures, just R, G, B color information are converted to electrical signal and send out and get final product.Yet transmitting bandwidth is limited, just must utilize special mode R, G, B color data to be converted to the data of brightness (luma) and chroma (chroma) in order to save transmitting bandwidth.For example Y (brightness), U (chroma), V (chroma) data promptly are wherein examples that R, G, B data is converted to brightness and chroma data.The Guan Shiwei of R, G, B data and Y, U, V data: Y=0.299R+0.587G+0.114B; U=0.493 (B-Y); V=0.877 (R-Y).The weighted value of R, G, B represents human vision to trichromatic impression degree in the Y formula.U and V represent respectively and to have removed blue and red after the brightness.For white light (being R=G=B), the value of U and V is all 0 (expression no color differnece).
In the process of signal transmission, must earlier the chroma data be modulated on the subcarrier signal (subcarrier) and mix with the brightness data again.(National Television Standards Committee, the NTSC standard of NTSC) being formulated promptly is to transmit after Y, U, V data are modulated into the composite color television signal (composite signal) of Y+U * sin (ω t)+V * cos (ω t) as (U.S.) NTSC.ω=2 π * Fsc wherein, Fsc is subcarrier signal frequency (subcarrier frequency).Television standard-the PAL of European countries (Phasealternating Line) is also arranged in addition, and this standard is with anti-phase modulation Y, U, V data line by line.In the PAL modulation picture frame (frame) when Y, the U of each horizontal line (line), V data, the mutual modulation system of selecting to use Y+U * sin (ω t)+V * cos (ω t) or Y+U * sin (ω t)-V * cos (ω t).That is to say that if wherein a horizontal line is with Y+U * sin (ω t)+V * cos (ω t) modulation Y, U, V data, then its next bar horizontal line changes with Y+U * sin (ω t)-V * cos (ω t) modulation.
After the recipient receives the composite color television signal, must be earlier with its sampling (sample).General comb filter (comb filter) can reach sample composite color television signal with the frequency of four times of Fsc, and so every horizontal line of NTSC can get 910 sampling points (sample point); Every horizontal line of PAL then has 1135 sampling points.A picture frame of NTSC (frame) has 525 horizontal lines, so 910 * 525=477750 sampling point arranged; And PAL is more special, and a picture frame has 625 horizontal lines, but has 1135 * 625+4=709379 sampling point.Because the number of sampling of whole picture frame is not horizontal integral multiple, so in various degree phase angle difference (phase error) can occur in different sample position.
Generally speaking, the most difficult part is exactly that brightness separates with chroma in the technology of video decoder (TV decoder).The effect quality that brightness/chroma separates influences the decoding quality of video decoder.So in the application for high-quality image demand, adopt three-dimensional comb filter (3D combfilter) technology to reach brightness/chroma mostly and separate at present.
In the time will doing three-dimensional comb type filtering to the composite color television signal, at first must be with phase angle once every 90 degree samplings with the composite color television signal.With NTSC, sampling phase (sample phase) can obtain Y+V, Y+U, Y-V Y-U respectively when 0,0.5 π, π and 1.5 π.Seeing also shown in Figure 1ly, is sampling result (part) schematic diagram of picture frame in the explanation NTSC system.The longitudinal axis is represented the position x of horizontal line line in picture frame among the figure, and transverse axis is then represented the position y of picture element in horizontal line.Two sampled datas are if belong to respectively in the adjacent picture frame but during for identical correspondence position, because differ 477750 sampling points (4 multiple surpluss 2), so the two phase place can just differ from 180 degree.The sampling relation of aforesaid adjacent picture frame can also describe by Fig. 1, gets final product (this moment, the longitudinal axis was time shaft) but ordinate of orthogonal axes among the figure must be changed the sequence number m that is considered as picture frame frame.
The situation of PAL is special than NTSC, and a picture frame has 709379 sampling points (4 multiple surpluss 3), so though at same correspondence position, if the data Y+U that previous picture frame is sampled to, then next picture frame may sampling result be Y+V, next is Y-U again.Seeing also shown in Fig. 2 A, is to illustrate that picture frame is with sampling result (part) schematic diagram of sampling phase 0,0.5 π, π and 1.5 π in the PAL system.The longitudinal axis is represented the position x of horizontal line line in picture frame among the figure, and transverse axis is then represented the position y (wherein the longitudinal axis also can be considered front and back adjacent picture frame frame) of picture element in horizontal line.So arrange to be inconvenient to implement the filtering of comb type, so generally all be that promptly sampling phase is taken a sample respectively when 0.25 π, 0.75 π, 1.25 π and 1.75 π with sampling phase displacement (shift) 45 degree.See also shown in Fig. 2 B, it is to illustrate that picture frame is with sampling result (part) schematic diagram of sampling phase 0.25 π, 0.75 π, 1.25 π and 1.75 π in the PAL system.The longitudinal axis is represented the position x of horizontal line line in picture frame among the figure, and transverse axis is then represented the position y of picture element in horizontal line (wherein the longitudinal axis before and after also can be considered adjacent picture frame frame), A=0.707 (U+V) wherein, B=0.707 (U-V).
When handling the signal of PAL, because the picture frame of PAL has 1135 * 625+4 point, neither 1135 integral multiple, integral multiple that neither 625.So error to some extent when taking a sample with 1135 of every row can reach 4 picture elements behind these error accumulations 625 row horizontal lines.Usually the error of these 4 picture elements is to be shared out equally by 625 horizontal lines, and therefore every horizontal line can 4/625 picture element of displacement.Therefore, the phase place of each sampling point can just not be 0.25 π, 0.75 π, 1.25 π and 1.75 π usually, and has a little phase angle difference (phase error).The modulation system of PAL system is Y+U * sin (ω t)+V * cos (ω t) or Y+U * sin (ω t)-V * cos (ω t), considers that ω t is (0.25 π+δ), (0.75 π+δ), (1.25 π+δ) and (situation (δ is a phase angle difference): the sin of 1.75 π+δ) (0.25 π+δ)=sin (0.25 π) cos (δ)+cos (0.25 π) sin (δ)=0.707 (cos δ+sin δ)=0.707 (1+e
0); Cos (0.25 π+δ)=cos (0.25 π) cos (δ)-sin (0.25 π) sin (δ)=0.707 (cos δ-sin δ)=0.707 (1-e
0); So Y+U * sin (ω t)+V * cos (ω t)=Y+0.707 (U+V+e
0(U-V))=Y+A+e
BRemaining angle can the rest may be inferred, can obtain actual sampling value at last shown in Fig. 2 C, wherein phase difference value e
A=e
0* A, phase difference value e
B=e
0* B.Please consulting shown in Fig. 2 C, is to illustrate that picture frame is with the schematic diagram of the actual sampling result (part) of sampling phase 0.25 π+δ, 0.75 π+δ, 1.25 π+δ and 1.75 π+δ in the PAL system again.The longitudinal axis is represented the position x of horizontal line in picture frame among Fig. 2 C, and transverse axis is then represented the position y (wherein the longitudinal axis also can be expressed as front and back adjacent picture frame frame relation) of picture element in horizontal line line.
Seeing also shown in Figure 3ly, is the calcspar of existing known three-dimensional comb filter.General three-dimensional comb filter comprises many picture frames brightness/chroma separator (inter-frame Y/C separator) 310, two-dimentional brightness/chroma separator (intra-field Y/C separator, the two-dimentional comb filter that promptly generally is commonly called as) 320, moving detector (motion detector) 330, memory body 340 and blender (mixer) 350.Composite color television signal (composite video signal) the 301st is through the composite color television signal after the sampling, F
M+1Representing this composite color television signal 301 is the composite color television signal of m+1 picture frame.Memory body 340 temporary composite color television signals 301 also provide composite color television signal 302 and composite color television signal 305 (F
mRepresent the composite color television signal of m picture frame).Two dimension brightness/chroma separator 320 receives composite color television signal 305, and utilizes picture frame F
mIn spatial correlation between each picture element carry out that brightness/chroma is separated and output separates video signal (separated video signal) 321.
Common dynamic video signal (motion video signal) promptly adopts two-dimentional brightness/chroma separator 320 to finish brightness and chroma mask work.But two-dimentional brightness/chroma separator 320 can cause shortcomings such as edge blurry when handling static video signal (still video signal).In order to promote image quality, handle so generally all static video signal can be given many picture frames brightness/chroma separator 310.Existing known many picture frames brightness/chroma separator 310 receives picture frame F simultaneously
M+1With picture frame F
mThe composite color television signal, and utilize adjacent picture frame F
M+1With picture frame F
mIn property association in time between each corresponding picture element carry out that brightness/chroma is separated and output separates video signal 311.Judge that composite color television signal 301 is that dynamically the work of (motion) or static (still) then is responsible for by moving detector (motiondetector) 330.Existing known moving detector 330 receives composite color television signal 301 and separates video signal 321, utilize the luminance difference and the chroma of separating between video signal 321 and composite color television signal 301 calculating two picture frames poor, utilize this luminance difference and chroma difference to judge the moving/quiet state and the output selection signal 331 of picture element.Blender 350 is promptly selected to separate video signals 321, is separated video signal 311 or the two is mixed according to predetermined ratio according to selection signal 331, and exports and separate video signal 351.
With NTSC, have the method that known many picture frames brightness/chroma is separated now with Fig. 1 aid illustration now.See also shown in Figure 1, existing known techniques is that the composite color television signal phase adduction of the pixel of identical correspondence position in adjacent two picture frames (such as picture frame m and m+1) (for example y picture element) can be obtained the brightness data after average, but obtains the chroma data as if subtracting each other then cancellation brightness data.If mix noise (noise) in the process of modulation or transmission signal, then this existing known techniques is relatively poor to the immunity of noise.
If with PAL, now with Fig. 2 C aid illustration method that existing known many picture frames brightness/chroma is separated.See also shown in Fig. 2 C, existing known techniques is can cancellation chroma data A (or B) and phase difference value e after average with the composite color television signal phase adduction of the pixel of identical correspondence position in a picture frame and the first two picture frame (such as picture frame m+1 and m-1) (for example y picture element)
B(or e
A) obtain brightness data Y.If with identical correspondence position in a picture frame and the first two picture frame (such as picture frame m+1 and m-1) (such as y picture element) though but the composite color television signal of pixel subtract each other cancellation brightness data Y, still can not cancellation phase difference value e
B(or e
A).Its result can see band one by one exactly on picture.
This shows that the method that above-mentioned existing many picture frames brightness/chroma is separated still has defective, and demands urgently further being improved.In order to solve the defective that method that existing many picture frames brightness/chroma separates exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but does not see always that for a long time suitable design finished by development, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that the method that above-mentioned existing many picture frames brightness/chroma is separated exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding the method that a kind of new many picture frames brightness/chroma is separated, can improve the method that general existing many picture frames brightness/chroma is separated, make it have more practicality.Through continuous research and design, and after studying repeatedly and improving, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective of the method existence of above-mentioned existing many picture frames brightness/chroma separation, and the method that provides a kind of new many picture frames brightness/chroma to separate, technical problem to be solved is to make it can improve the noise tolerance, accurately separating luminance data and chroma data.For the PAL system, the error that phase angle difference caused more can allow between each picture frame because just can be supported system mutually, the error that phase angle difference caused more can allow between each picture frame because just can mutually offset, make the PAL system also can use the technology that many picture frames brightness/chroma is separated, thereby be suitable for practicality more, and have the value on the industry.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.According to the method that a kind of many picture frames brightness/chroma of the present invention's proposition is separated, its composite color television signal that comprises the following steps: to take a sample is to obtain and temporary most individual sampling data F
mP
X, y, F wherein
mP
X, yRepresent the sampling data of y capable picture element of the x of m picture frame in this composite color television signal, and m, x, y are the positive integer more than or equal to 0; Utilize Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
m-1P
X, y+ F
M-2P
X, yBrightness data Y is calculated in)/4
X, y, Y wherein
X, yRepresent the x of m picture frame capable, the brightness data of a y picture element.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The method that aforesaid many picture frames brightness/chroma is separated, wherein when judging that this composite color television signal is the signal of a NTSC system, the step of this composite color television signal of then taking a sample is to take a sample with 4 overtones bands of the subcarrier signal in this composite color television signal, and is to do sampling when this subcarrier signal phase place is 0,0.5 π, π and 1.5 π.
The method that aforesaid many picture frames brightness/chroma is separated, wherein said calculating chroma data is according to formula: C
X, y=± (F
mP
X, y+ F
M-2P
X, y-F
M+1P
X, y-F
M-1P
X, y)/4.
The method that aforesaid many picture frames brightness/chroma is separated, wherein said those chroma data C
X, yIt is the chroma data of m picture frame.
The method that aforesaid many picture frames brightness/chroma is separated, it is to take a sample with 4 overtones bands of the subcarrier signal in this composite color television signal for the step of this composite color television signal of wherein said sampling, and is to do sampling when this subcarrier signal phase place is 0.25 π, 0.75 π, 1.25 π and 1.75 π.
The method that aforesaid many picture frames brightness/chroma is separated, wherein said calculating chroma data is according to formula: C
X, y=± (F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4; And C
X, y=± (F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, y)/4 the two one of.
The method that aforesaid many picture frames brightness/chroma is separated, wherein said those chroma data C
X, yIt is the chroma data of m picture frame.
The method that aforesaid many picture frames brightness/chroma separates, wherein said wherein when judging that this composite color television signal is the signal of a PAL system, ability is done sampling when this subcarrier signal phase place is 0.25 π, 0.75 π, 1.25 π and 1.75 π.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes the method that a kind of many picture frames brightness/chroma separates, and the method composite color television signal of at first taking a sample is to obtain and temporary most sampling data F
mP
X, y, F wherein
mP
X, yRepresent the sampling data of y capable picture element of the x of m picture frame in this composite color television signal, and m, x, y are the positive integer more than or equal to 0; Utilize Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
M-1P
X, y+ F
M-2P
X, yBrightness data Y is calculated in)/4
X, y, Y wherein
X, yRepresent the x of m picture frame capable, the brightness data of a y picture element.
Method according to the described many picture frames brightness of preferred embodiment of the present invention/chroma separation, when judging that this composite color television signal is the signal of NTSC system, the step of composite color television signal of then taking a sample is to take a sample with 4 overtones bands of the subcarrier signal in the composite color television signal, and is to do sampling when subcarrier signal phase place is 0,0.5 π, π and 1.5 π.And wherein calculate the chroma data is according to formula: C
X, y=± (F
mP
X, y+ F
M-2P
X, y-F
M+1P
X, y-F
M-1P
X, y)/4.Chroma data C wherein
X, yBe the chroma data of m picture frame for example.
Method according to the described many picture frames brightness of preferred embodiment of the present invention/chroma separation, when judging that this composite color television signal is the signal of PAL system, the step of above-mentioned sampling composite color television signal is to take a sample with 4 overtones bands of the subcarrier signal in the composite color television signal, and is to do sampling when subcarrier signal phase place is 0.25 π, 0.75 π, 1.25 π and 1.75 π.Wherein calculating the chroma data is according to formula: C
X, y=± (F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4 and C
X, y=± (F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, y)/4 the two one of.Chroma data C in this embodiment
X, yIt for example is the chroma data of m picture frame.
By technique scheme, the present invention does brightness/chroma because of the data that adopts four picture frames and separates, and therefore under the situation of NTSC, can reduce The noise, and can obtain more accurate brightness/chroma data.Under the situation of PAL, except reducing the noise, can also allow just can mutually offset because of the error that phase angle difference caused between each picture frame, make the PAL system also can use the technology that many picture frames brightness/chroma is separated.
In sum, the method that many picture frames brightness that the present invention is special/chroma is separated can improve the noise tolerance, accurately separating luminance data and chroma data.For the PAL system, more can allow just can mutually offset because of the error that phase angle difference caused between each picture frame, make the PAL system also can use the technology that many picture frames brightness/chroma is separated, thereby be suitable for practicality more.It has above-mentioned many advantages and practical value, and in class methods, do not see have similar design to publish or use and really genus innovation, no matter it is all having bigger improvement on method or on the function, have technically than much progress, and having produced handy and practical effect, the method that and more existing many picture frames brightness/chroma is separated has the multinomial effect of enhancement, thereby is suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the schematic diagram of the sampling result (part) of picture frame in the explanation NTSC system.
Fig. 2 A illustrates that picture frame is with sampling result (part) schematic diagram of sampling phase 0,0.5 π, π and 1.5 π in the PAL system.
Fig. 2 B illustrates that picture frame is with sampling result (part) schematic diagram of sampling phase 0.25 π, 0.75 π, 1.25 π and 1.75 π in the PAL system.
Fig. 2 C illustrates that picture frame is with actual sampling result (part) schematic diagram of sampling phase 0.25 π+δ, 0.75 π+δ, 1.25 π+δ and 1.75 π+δ in the PAL system.
Fig. 3 is the block diagram that has known three-dimensional comb filter now.
Fig. 4 is the flow chart of a kind of many picture frames brightness/chroma separation method of illustrating according to a preferred embodiment of the present invention.
Fig. 5 is the block diagram of the application system of a kind of many picture frames brightness/chroma separation method of illustrating according to a preferred embodiment of the present invention.
301,302,305,501,502,503,504,505: the composite color television signal
310,510: many picture frames brightness/chroma separator (inter-frame Y/C separator)
320,520: two-dimentional brightness/chroma separator (intra-field Y/C separator)
330,530: moving detector (motion detector)
340,540: memory body
350,550: blender (mixer)
311,321,351,511,521,551: separate video signal (separated video signal)
331,531: select signal
S401: sampling composite color television signal obtains sampling data F
mP
X, y
S402: brightness data Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
M-1P
X, y+ F
M-2P
X, y)/4
S403: judge NTSC system or PAL system
S404: chroma data C
X, y=± (F
mP
X, y+ F
M-2P
X, y-F
M+1P
X, y-F
M-1P
X, y)/4
S405: chroma data C
X, y=± (F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4 or C
X, y=± (F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, y)/4
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, its concrete grammar of method, step, feature and effect thereof that many picture frames brightness/chroma that foundation the present invention is proposed is separated, describe in detail as after.
Fig. 1 is the schematic diagram of the sampling result (part) of picture frame in the explanation NTSC system.Fig. 2 C illustrates that picture frame is with actual sampling result (part) schematic diagram of sampling phase 0.25 π+δ, 0.75 π+δ, 1.25 π+δ and 1.75 π+δ in the PAL system.Fig. 4 is the flow chart of a kind of many picture frames brightness/chroma separation method of illustrating according to a preferred embodiment of the present invention.
Please consult Fig. 1, Fig. 2 C and shown in Figure 4 simultaneously, the method that many picture frames brightness of preferred embodiment of the present invention/chroma is separated, step S401 is sampling composite color television signal and obtains sampling data F
mP
X, y, F wherein
mP
X, yRepresent the sampling data of y capable picture element of the x of m picture frame in this composite color television signal, and m, x, y are the positive integer more than or equal to 0.In the present embodiment, step S401 takes a sample with 4 overtones bands of the subcarrier signal in the composite color television signal if operate then under the NTSC system, and is to do sampling when subcarrier signal phase place is 0,0.5 π, π and 1.5 π.If also take a sample at step S401, but when being 0.25 π, 0.75 π, 1.25 π and 1.75 π, subcarrier signal phase place does sampling with 4 overtones bands of the subcarrier signal in this composite color television signal at the next present embodiment of PAL system.
Step S402 is for calculating and obtain brightness data Y
X, y, Y wherein
X, yRepresent the brightness data of y capable picture element of x.Calculate the brightness data for example according to formula: Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
M-1P
X, y+ F
M-2P
X, y)/4.In the present embodiment, Y
X, yIt for example is the brightness data of m picture frame.With NTSC system shown in Figure 1 (longitudinal axis is represented picture frame frame, and transverse axis is represented picture element pixel) is example, then Y
X, y=((Y-U)+(Y+U)+(Y-U)+(Y+U))/4=Y, the brightness data Y of y picture element that can x is capable separates from compound color-television signal.Be example, then Y with the PAL system shown in Fig. 2 C (longitudinal axis is represented picture frame frame, and transverse axis is represented picture element pixel) in addition
X, y=((Y+B-e
A)+(Y+B+e
A)+(Y-B+e
A)+(Y-B-e
A))/4=Y, the brightness data Y of y the picture element that the result also can be capable with x separates from the composite color television signal.
Select NTSC system or PAL system (step S403),, otherwise carry out step S405 if the NTSC system then carries out step S404.
Step S404 is for calculating and obtain chroma data C
X, y, C wherein
X, yRepresent the chroma data of y capable picture element of x, its calculating formula is C
X, y=± (F
mP
X, y+ F
M-2P
X, y-F
M+1P
X, y-F
M-1P
X, y)/4.In the present embodiment, C
X, yIt for example is the chroma data of m picture frame.With NTSC system shown in Figure 1 (longitudinal axis is represented picture frame frame, and transverse axis is represented picture element pixel) is example, then C
X, y=((Y+U)+(Y+U)-(Y-U)-(Y-U))/4=U, the chroma data C (being U or V) of y picture element that can x is capable separates from compound color-television signal.
Step S405 is then with formula C
X, y=± (F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4 or C
X, y=± (F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, y)/4 calculate the chroma data C of y capable picture element of x.Aforementioned two formulas for being used alternatingly, that is to say when calculating each adjacent picture element, if calculate C
X, yThe time use before formula, then calculate and C
X, yThe chroma data C of adjacent picture element
X, y-1, C
X, y+1, C
X-1, yAnd C
X+1, yThe time use the back formula.With the PAL system shown in Fig. 2 C (longitudinal axis is represented picture frame frame, and transverse axis is represented picture element pixel) is example, then C
X, y=(F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4=((Y+B-e
A)+(Y+B+e
A)-(Y-B+e
A)-(Y-B-e
A))/4=B, and C
X, y+1=(F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, y)/4=((Y+A-e
B)+(Y+A+e
B)-(Y-A-e
B)-(Y-A+e
B))/4=A, its result can separate the chroma data C (being A or B) of each picture element from the composite color television signal.
The method that comprehensive above-mentioned many picture frames brightness/chroma is separated is enumerated a preferred embodiment more to clearly demonstrate application examples of the present invention at this according to the present invention.Seeing also shown in Figure 5ly, is the block diagram of the application system of a kind of many picture frames brightness/chroma separation method of illustrating according to a preferred embodiment of the present invention.Use three-dimensional comb filter example of the present invention, comprise many picture frames brightness/chroma separator (inter-frameY/C separator) 510, two-dimentional brightness/chroma separator (the two-dimentional comb filter that intra-field Y/C separator promptly generally is commonly called as) 520, moving detector (motion detector) 530, memory body (internal memory) 540 and blender (mixer) 550, wherein many picture frames brightness/chroma separator 510 promptly has function of the present invention.Composite color television signal (composite video signal)) the 501st, through the composite color television signal after the sampling, F
M+1Representing this composite color television signal 501 is the composite color television signal of m+1 picture frame.Memory body 540 temporary composite color television signals 501 also provide composite color television signal 502 (m picture frame F
m), composite color television signal 503 (m-1 picture frame F
M-1) and composite color television signal 504 (m-2 picture frame F
M-2).Memory body 540 provides composite color television signal 505 (m picture frame F in addition
m).Two dimension brightness/chroma separator 520 receives composite color television signal 505, and utilizes picture frame F
mIn spatial correlation between each picture element carry out that brightness/chroma is separated and output separates video signal (separated video signal) 521.
Dynamically video signal (motion video signal) adopts two-dimentional brightness/chroma separator 520 to finish brightness and chroma mask work.In order to promote image quality, handle so give many picture frames brightness/chroma separator 510 with static video signal (stillvideo signal).Many picture frames brightness/chroma separator 510 receives picture frame F in the composite color television signal simultaneously
M+1, F
m, F
M-1And F
M-2The sampling data, and the many picture frames brightness/chroma separation method that utilizes the invention described above embodiment to be exemplified carries out that brightness/chroma separates and output separates video signal 511, its method does not repeat them here.Judge that composite color television signal 501 is that dynamically the work of (motion) or static (still) then is responsible for by moving detector 530.Moving detector 530 receives picture frame F in the composite color television signal
M+1, F
m, F
M-1And F
M-2The sampling data, luminance difference and the chroma calculated according to this between each picture frame are poor, utilize this luminance difference and chroma difference to judge moving/quiet state of picture element, and signal 531 are selected in output.Blender 550 is promptly according to selecting signal 531 to select to separate video signals 521, separate video signal 511 or according to predetermined ratio the two is mixed, and output separates video signal 551.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (2)
1. the method that many picture frames of NTSC brightness/chroma is separated is characterized in that comprising the following steps:
With 4 overtones bands of the subcarrier signal in the composite color television signal this composite color television signal of taking a sample, and when being 0,0.5 π, π and 1.5 π, this subcarrier signal phase place does sampling, to obtain and temporary most sampling data F
mP
X, y, F wherein
mP
X, yRepresent the x of m picture frame in this composite color television signal capable, the sampling data of a y picture element, and m, x, y are the positive integer more than or equal to 0;
Utilize Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
M-1P
X, y+ F
M-2P
X, yBrightness data Y is calculated in)/4
X, y, Y wherein
X, yRepresent the x of m picture frame capable, the brightness data of a y picture element;
Utilize C
X, y=± (F
mP
X, y+ F
M-2P
X, y-F
M+1P
X, y-F
M-1P
X, yChroma data C is calculated in)/4
X, y, C wherein
X, yRepresent the x of m picture frame capable, the chroma data of a y picture element.
2. the method that many picture frames of PAL brightness/chroma is separated is characterized in that comprising the following steps:
With 4 overtones bands of the subcarrier signal in the composite color television signal this composite color television signal of taking a sample, and when being 0.25 π, 0.75 π, 1.25 π and 1.75 π, this subcarrier signal phase place does sampling, to obtain and temporary most sampling data F
mP
X, y, F wherein
mP
X, yRepresent the x of m picture frame in this composite color television signal capable, the sampling data of a y picture element, and m, x, y are the positive integer more than or equal to 0;
Utilize Y
X, y=(F
M+1P
X, y+ F
mP
X, y+ F
M-1P
X, y+ F
M-2P
X, yBrightness data Y is calculated in)/4
X, y, Y wherein
X, yRepresent the x of m picture frame capable, the brightness data of a y picture element;
Utilize C
X, y=± (F
M+1P
X, y+ F
mP
X, y-F
M-1P
X, y-F
M-2P
X, y)/4 or C
X, y=± (F
mP
X, y+ F
M-1P
X, y-F
M+1P
X, y-F
M-2P
X, yChroma data C is calculated in)/4
X, y, C wherein
X, yRepresent the x of m picture frame capable, the chroma data of a y picture element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310110400XA CN100340120C (en) | 2003-12-30 | 2003-12-30 | Multi-frame brightness/chroma separation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310110400XA CN100340120C (en) | 2003-12-30 | 2003-12-30 | Multi-frame brightness/chroma separation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1635797A CN1635797A (en) | 2005-07-06 |
| CN100340120C true CN100340120C (en) | 2007-09-26 |
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ID=34843230
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|---|---|---|---|
| CNB200310110400XA Expired - Fee Related CN100340120C (en) | 2003-12-30 | 2003-12-30 | Multi-frame brightness/chroma separation method |
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| Country | Link |
|---|---|
| CN (1) | CN100340120C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5502509A (en) * | 1993-06-21 | 1996-03-26 | Mitsubishi Denki Kabushiki Kaisha | Chrominance-luminance separation method and filter performing selective spatial filter based on detected spatial correlation |
| CN1123991A (en) * | 1994-06-18 | 1996-06-05 | 三星电子株式会社 | Method and circuit for adaptively separating luminance and color signals based on expended vertical and horizontal correlations |
-
2003
- 2003-12-30 CN CNB200310110400XA patent/CN100340120C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5502509A (en) * | 1993-06-21 | 1996-03-26 | Mitsubishi Denki Kabushiki Kaisha | Chrominance-luminance separation method and filter performing selective spatial filter based on detected spatial correlation |
| CN1123991A (en) * | 1994-06-18 | 1996-06-05 | 三星电子株式会社 | Method and circuit for adaptively separating luminance and color signals based on expended vertical and horizontal correlations |
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| Publication number | Publication date |
|---|---|
| CN1635797A (en) | 2005-07-06 |
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