CN1635798A - Mobile sensing method for three-dimensional comb type filtering video signal decoder - Google Patents
Mobile sensing method for three-dimensional comb type filtering video signal decoder Download PDFInfo
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Abstract
This invention refers to a mobile detection method for three-D comb type filter video decoder, which contains picking up composite color television signal and obtaining plurality of information FmPx, y wherein FmPx, y representing y pixel in x row of m frame, the m, x, y, are positive integer greater than zero, then judging the active/static state of composite color television signal by Fm+Px, y, FmPx, y, Fm-1Px, y, and Fm-2Px, y. S aid invention can accurately judge mobile and more practice by directly utilizing brightness/chroma not separated composite color television signal to make mobile detection.
Description
Technical field
The present invention relates to the method for a kind of mobile detection (motion detection), particularly relate to the method (METHOD OF MOTIONDETECTION FOR 3D COMB FILTER VIDEO DECODER) of mobile detection in the video decoded device of three-dimensional comb type filtering of the three-dimensional video decoded device of comb type filtering of a kind of NTSC of being applied to (3D comb filter video decoder).
Background technology
In the modern life, people have not needed to go out to 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 be known the outside situation by video camera in the family.Function and purpose that above-mentioned various video-signal systems are had nothing in common with each other, 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 particular form R, G, B color data to be converted to the data of brightness (luma) and chroma (chroma) for saving 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 pass of R, G, B data and Y, U, V data is: 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.As (U.S.) NTSC (National Television Standards Committee, NTSC) the NTSC standard of 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).ω=2 π * Fsc wherein, Fsc is subcarrier signal frequency (subcarrier frequency).
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).A picture frame of NTSC (frame) has 525 horizontal lines, so 910*525=477750 sampling point arranged.Because the number of sampling of whole picture frame is not horizontal integral multiple, so in various degree phase difference value (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 decoded device (TV decoder).The effect quality that brightness/chroma separates influences the decoding quality of video decoded device.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 the schematic diagram of the sampling result (part) 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 aforementioned 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.
Seeing also shown in Fig. 2 A, is the calcspar that has known three-dimensional comb filter now.General existing three-dimensional comb filter comprises many picture frames brightness/chroma separator (inter-frame Y/Cseparator) 210, two-dimentional brightness/chroma separator (intra-field Y/C separator, the two-dimentional comb filter that promptly generally is commonly called as) 220, mobile detection device (motion detector) 230, memory body 240 and blender (mixer) 250.Composite color television signal (composite videosignal) the 201st is through the composite color television signal after the sampling, F
M+1Representing this composite color television signal 201 is the composite color television signal of m+1 picture frame.Memory body 240 temporary composite color television signals 201 also provide composite color television signal 202 and composite color television signal 205 (F
mRepresent the composite color television signal of m picture frame).Two dimension brightness/chroma separator 220 receives composite color television signal 205, 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) 221.
Common dynamic video signal (motion video signal) promptly adopts two-dimentional brightness/chroma separator 220 to finish brightness and chroma mask work.But two-dimentional brightness/chroma separator 220 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 210.Existing known many picture frames brightness/chroma separator 210 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 211.Judge that composite color television signal 201 is that dynamically the work of (motion) or static (still) then is responsible for by moving detector (motion detector) 230.Composite color television signal 201 and brightness data 221a (providing by separating video signal 221) are provided existing known moving detector 230, luminance difference and the chroma of utilizing brightness data 221a and composite color television signal 201 to calculate between two picture frames are poor, and utilize the moving/quiet state and the output of this luminance difference and chroma difference judgement picture element to select signal 231.Blender 250 is promptly selected to separate video signals 221, is separated video signal 211 or the two is mixed according to predetermined ratio according to selection signal 231, and exports and separate video signal 251.
Generally judge composite color television signal 201 moving/during quiet state, often moving characteristic value and default critical (threshold) value are done one relatively, if the moving characteristic value is obviously greater than critical value, then be judged as dynamically, this moment, testing circuit 280 outputs selected signal 231 to use two-dimentional brightness/chroma separator 220.If the moving characteristic value is significantly less than critical value, can assert then to be static state at that time that testing circuit 280 outputs this moment select signals 231 to use many picture frames brightness/chroma separator 210 to promote image quality.If the moving characteristic value is positioned near the critical value, rashly be judged to be dynamically or static state all is not too appropriate behavior, general all is that brightness/chroma data that two-dimentional brightness/chroma separator 220 and many picture frames brightness/chroma separator 210 are calculated separately is mixed with proper proportion, handles the situation of this gray zone.Therefore, moving characteristic value calculation mode does not more restrain, and then the scope of gray zone must heal greatly, and is just fewer from the resulting benefit of three-dimensional comb filter.
Having the method for known mobile detection now, is that the method for separating with two-dimentional brightness/chroma earlier calculates brightness/chroma data, makes comparisons with the brightness/chroma data of previous picture frame, then brightness/chroma the data that will export at last according to this comparative result decision again.Here just produced the problem of " chicken raw egg, egg live chickens ".If at the very start can two-dimentional brightness/method that chroma is separated correctly isolates brightness/chroma data, just do not needed three-dimensional comb filter, also just needn't go certainly to have calculated the moving characteristic value.If brightness/chroma data of calculating at the beginning has error, use brightness/chroma data that error is arranged to go the worthwhile error of calculating that so also has of moving characteristic so.Then with there being the moving characteristic value of error to go to determine final brightness/chroma data that its correctness will be given a discount naturally.
This shows that the method for mobile detection still has many defectives in the video decoded device of above-mentioned existing three-dimensional comb type filtering, and demands urgently further being improved.In order to solve the defective of the method for mobile detection in the video decoded device of existing three-dimensional comb type filtering, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that the method for mobile detection exists in the video decoded device of above-mentioned existing three-dimensional comb type filtering, 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 for mobile detection in a kind of new video decoded device of three-dimensional comb type filtering, can improve the method for mobile detection in the video decoded device of general existing three-dimensional comb type filtering, make it have more practicality.Through constantly research, 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 mobile detection in the video decoded device of existing three-dimensional comb type filtering, and provide the method for mobile detection in a kind of new video decoded device of three-dimensional comb type filtering, technical problem to be solved is the method that makes mobile detection in its video decoded device of three-dimensional comb type filtering that a kind of NTSC of being applied to system can be provided, adopt the foundation of original composite color television signal (composite video signal) as mobile detection, thereby be suitable for practicality more, and have the value on the industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.Method according to mobile detection in the video decoded device of a kind of three-dimensional comb type filtering of the present invention's proposition, be applicable to a NTSC system, this method composite color television signal that comprises the following steps: to take a sample, to obtain and temporary most sampling data FmPx y, wherein FmPx, y represents 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; And utilizing Fm+1Px, y, FmPx, y, Fm-1Px, y and Fm-2Px, y judge the moving/quiet state of this composite color television signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, the step of the moving/quiet state of this composite color television signal of wherein said judgement, comprise the following steps: to utilize Fm+1Px, y, FmPx, y, Fm-1Px, y and Fm-2Px, y calculates and obtains most maximum difference MDx, y, MDx wherein, y represents the maximum difference of y capable picture element of x; The maximum difference of optional 4 adjacent picture elements also calculates its mean value, obtaining most moving characteristic value MFx, and y, MFx wherein, y represents the moving characteristic value of y capable picture element of x; And detecting MFx, y is to judge the moving/quiet state of y the picture element that x is capable in this composite color television signal.
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, the step of this composite color television signal of wherein said sampling 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 of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, wherein said calculating MDx, y are according to formula:
MDx，y＝Max{|FmPx，y-Fm-2Px，y|，|Fm+1Px，y-Fm-1Px，y|}。
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, wherein said acquisition MFx, the step of y, comprise following step: optional comprise MDx, the maximum difference of 4 adjacent picture elements of y also calculates its mean value, obtains most average maximum difference AMDx, h, AMDx wherein, h represents the average maximum difference of h capable picture element of x, h is a positive integer, and its calculating is according to formula: AMDx, h=(MDx, h+MDx, h+1+MDx, h+2+MDx, h+3)/4; And in those average maximum differences, get its minimum value, and and obtain a moving characteristic value MFx, y, MFx wherein, y represents the moving characteristic value of y capable picture element of x.
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering is wherein saidly got its minimum value and is obtained MFx in those average maximum differences, the step of y is according to formula: MFx, y=Min (AMDx, y, AMDx, y-1, AMDx, y-2, AMDx, y-3).
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering is wherein saidly got its minimum value and is obtained MFx in those average maximum differences, the step of y is according to formula: MFx, y=Min (AMDx, y, AMDx, y-3).
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, wherein said detection MFx, y comprises the following steps: to provide a critical value with the step of moving/quiet state of judging x is capable in this composite color television signal y picture element; And MFx relatively, y and this critical value are worked as MFx, and y judges x is capable in this composite color television signal y picture element during greater than this critical value for dynamically, otherwise then is static state.
The method of mobile detection in the video decoded device of aforesaid three-dimensional comb type filtering, wherein said those moving characteristic values MFx, y is the moving characteristic value of m picture frame.
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 for mobile detection in the video decoded device of a kind of three-dimensional comb type filtering, is applied to the NTSC system, and the method composite color television signal of at first taking a sample is to obtain and temporary a plurality of 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 the composite color television signal, and m, x, y are the positive integer more than or equal to 0.Utilize F then
M+1P
X, y, F
mP
X, y, F
M-1P
X, yAnd F
M-2P
X, yJudge the moving/quiet state of composite color television signal.
According to the method for mobile detection in the video decoded device of the described three-dimensional comb type of preferred embodiment of the present invention filtering, the step of the moving/quiet state of this composite color television signal of above-mentioned judgement comprises following each step.At first utilize F
M+1P
X, y, F
mP
X, y, F
M-1P
X, yAnd F
M-2P
X, yCalculate and obtain a plurality of maximum difference MD
X, y, MD wherein
X, yRepresent the maximum difference of y capable picture element of x.Choose the maximum difference of 4 adjacent picture elements then wantonly and calculate its mean value, to obtain a plurality of moving characteristic value MF
X, y, MF wherein
X, yRepresent the moving characteristic value of y capable picture element of x.Detect MF at last
X, y, to judge the moving/quiet state of y the picture element that x is capable in the composite color television signal.
Method according to mobile detection in the video decoded device of the described three-dimensional comb type of preferred embodiment of the present invention filtering, the step of composite color television signal of wherein 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.Calculate MD this moment
X, yBe according to formula: MD
X, y=Max{|F
mP
X, y-F
M-2P
X, y|, | F
M+1P
X, y-F
M-1P
X, y|.
According to the method for mobile detection in the video decoded device of the described three-dimensional comb type of preferred embodiment of the present invention filtering, above-mentioned acquisition MF
X, yStep, comprise following each step.The at first optional MD that comprises
X, y4 adjacent picture elements maximum difference and calculate its mean value, obtain most average maximum difference AMD
X, h, AMD wherein
X, hRepresent the average maximum difference of h capable picture element of x, h is a positive integer.Its calculating is according to formula: AMD
X, h=(MD
X, h+ MD
X, h+1+ MD
X, h+2+ MD
X, h+3)/4.In adjacent several average maximum differences, get its minimum value then, and obtain a moving characteristic value MF
X, y, MF wherein
X, yRepresent the moving characteristic value of y capable picture element of x.Represent with formula: MF for example
X, y=Min (AMD
X, y, AMD
X, y-1, AMD
X, y-2, AMD
X, y-3), perhaps MF for example
X, y=Min (AMD
X, y, AMD
X, y-3) etc., all meet the spirit of technical solution of the present invention.
According to the method for mobile detection in the video decoded device of the described three-dimensional comb type of preferred embodiment of the present invention filtering, above-mentioned detection MF
X, yTo judge the step of the moving of x is capable in the composite color television signal y picture element/quiet state, comprise following each step.One critical value at first is provided.Compare MF then
X, yAnd critical value, work as MF
X, yJudge during greater than critical value that y the picture element that x is capable in the composite color television signal is dynamically, otherwise then be static.Moving characteristic value MF wherein
X, yIt for example is the moving characteristic value of m picture frame.
By technique scheme, therefore the present invention can judge mobile degree very accurately, and make the advantage of the video decoded device of three-dimensional comb type filtering perform to ultimate attainment because directly do mobile detection according to the composite color television signal of not doing brightness/chroma separation.
In sum, the method of mobile detection in the novel special video decoded device of three-dimensional comb type filtering of the present invention, the method of mobile detection in the video decoded device of three-dimensional comb type filtering of a kind of NTSC of being applied to system can be provided, adopt the foundation of original composite color television signal (composite video signal), thereby be suitable for practicality more as mobile detection.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 large improvement technically, and produced handy and practical effect, and the method for mobile detection has the multinomial effect of enhancement in the video decoded device of more existing three-dimensional comb type filtering, thereby be 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 sampling result (part) schematic diagram of picture frame in the explanation NTSC system.
Fig. 2 A is the calcspar that has known three-dimensional comb filter now.
Fig. 2 B is the moving detector calcspar that has known three-dimensional comb filter now.
Fig. 3 is the flow chart of mobile detection method in the video decoded device of the three-dimensional comb type filtering of a kind of NTSC that illustrates according to a preferred embodiment of the present invention.
Fig. 4 is the application system calcspar of mobile detection method in the video decoded device of the three-dimensional comb type filtering of a kind of NTSC that illustrates according to a preferred embodiment of the present invention.
201,202,205,401,402,403,404,405: the composite color television signal
210,410: many picture frames brightness/chroma separator (inter-frame Y/C separator)
221,211,251,411,421,451: separate video signal (separated video signal)
220,420: two-dimentional brightness/chroma separator (intra-field Y/C separator)
221a: separate the brightness data in the video signal 221
230,430: moving detector (motion detector)
231,431: select signal
232,233: the brightness data
234: luminance difference
236,238: the chroma data
239: the chroma difference
240,440: memory body (internal memory)
250,450: blender (mixer)
260: low pass filter
270: high pass filter
280: testing circuit
291,292,293: the picture frame buffer
S301: sampling composite color television signal obtains sampling data F
mP
X, y
S302: calculate maximum difference MD
X, y
S303: calculate left mean maximum difference AMDL
X, y
S304: calculate right average maximum difference AMDR
X, y
S305: calculate moving characteristic value MF
X, y
S306: critical value is provided
S307: compare MF
X, yWith the critical value size
S308: judge that picture element is dynamic
S309: judge that picture element is static
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, its concrete grammar of method, step, feature and the effect thereof of mobile detection in the video decoded device of three-dimensional comb type filtering that foundation the present invention is proposed, describe in detail as after.
Fig. 3 is the flow chart of mobile detection method in the video decoded device of the three-dimensional comb type filtering of a kind of NTSC that illustrates according to a preferred embodiment of the present invention.Please consult Fig. 1 and shown in Figure 3 simultaneously, the method for mobile detection in the video decoded device of three-dimensional comb type filtering of preferred embodiment of the present invention, step S301 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, the NTSC system for example takes 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.
Step S302 calculates maximum difference (max difference) MD
X, y(MD
X, yThe maximum difference of representing y the picture element that x is capable), its calculating is according to formula: MD
X, y=Max{|F
mP
X, y-F
M-2P
X, y|, | F
M+1P
X, y-F
M-1P
X, y|.In the present embodiment, MD
X, yIt for example is the maximum difference 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, and y picture element all is Y+U in the value of picture frame m and the first two picture frame m-2 among the figure, and last picture frame m-1 is Y-U with back one picture frame m+1.Take Y+U and Y+U to subtract each other and take absolute value, take Y-U and Y-U to subtract each other again and take absolute value, get the greater in these two absolute values and can obtain MD
X, y
Yet, only take the maximum difference MD of each picture element
X, yIt is ill-considered being used as the moving characteristic value, because the attribute of each sampling point (sample point) representative is different.Each picture element of supposing m+1 picture frame all is red, and each picture element of all the other each picture frames all is white.The brightness Y of white more than the brightness Y of redness come big, and red chroma V more than the chroma V of white come big, chroma U then is that both are slightly variant, but difference is not very big.So when the Y+V that takes white compared with red Y+V, its difference was very little; But take the Y-V of white to remove ratio with red Y-V, difference will be special big.And when going respectively, can obtain different differences again than Y+U and Y-U.That is to say, even be that color A and color B go to compare equally, if the project difference of ratio, could be than going out different differences.If the moving characteristic value of each picture element is decided in its sole discretion by each picture element, then the phenomenon as sine wave will appear in the moving characteristic value.Therefore must be one group with four picture elements decides final moving characteristic value.
Therefore, obtaining the maximum difference MD of each picture element
X, yAfterwards, appoint and get the maximum difference (maximum difference that wherein comprises the target picture element) of four adjacent picture elements and calculate its mean value, in each mean value, select minimum value as the moving characteristic value.Represent with formula: AMD
X, h=(MD
X, h+ MD
X, h+1+ MD
X, h+2+ MD
X, h+3)/4; MF
X, y=Min (AMD
X, y, AMD
X, y-1, AMD
X, y-2, AMD
X, y-3).AMD wherein
X, hThe average maximum difference (average of max difference) of representing h the picture element that x is capable, MF
X, yThe moving characteristic value of representing y the picture element that x is capable.In the present embodiment only with left mean maximum difference AMDL
X, y(be AMD
X, y-3) and right average maximum difference AMDR
X, y(be AMD
X, y) be example, calculate AMDL respectively
X, y(step S303) and AMDR
X, y(step S304).Again from AMDL
X, yAnd AMDR
X, yIn the middle of get the smaller as moving characteristic value (step S305), represent with formula: MF
X, y=Min (AMDL
X, y, AMDR
X, y).Why will get smaller's reason, be because picture element P
X, y(representing y the picture element that x is capable) may be to be positioned on the edge of dynamic and static thing, and picture element P
X, yThe moving characteristic value can be subjected to again about the influence of totally 7 picture elements.If picture element P
X, yItself be static, do not wish that certainly it is disturbed and judge by accident to dynamically by left and right sides adjoint point.Therefore, in each average maximum difference, select minimum value to be only correct as the moving characteristic value.
Before judging the moving/quiet state of composite color television signal, need provide a critical value (threshold) (step S306) earlier.The moving characteristic value is compared (step S307) with default critical value,,, then can assert to be static (step S309) at that time if the moving characteristic value is significantly less than critical value if the moving characteristic value, then is judged as dynamically (step S308) obviously greater than critical value.
The method of mobile detection more clearly demonstrates of the present invention application examples according to preferred embodiment of the present invention with system block diagrams at this in the video decoded device of comprehensive above-mentioned three-dimensional comb type filtering.Fig. 4 is the application system calcspar that illustrates mobile detection method in the video decoded device of the three-dimensional comb type filtering of a kind of NTSC according to a preferred embodiment of the present invention.See also Fig. 4, use three-dimensional comb filter example of the present invention and comprise many picture frames brightness/chroma separator (inter-frame Y/C separator) 410, two-dimentional brightness/chroma separator (intra-field Y/C separator, the two-dimentional comb filter that promptly generally is commonly called as) 420, moving detector (motion detector) 430, memory body 440 and blender (mixer) 450, wherein moving detector 430 promptly has function of the present invention.Composite color television signal (composite video signal) the 401st is through the composite color television signal after the sampling, F
M+1Representing this composite color television signal 401 is the composite color television signal of m+1 picture frame.Memory body 440 temporary composite color television signals 401 also provide composite color television signal 402 (m picture frame F
m), composite color television signal 403 (m-1 picture frame F
M-1) and composite color television signal 404 (m-2 picture frame F
M-2).Memory body 440 provides composite color television signal 405 (m picture frame F in addition
m).Two dimension brightness/chroma separator 420 receives composite color television signal 405, 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) 421.
Dynamically video signal (motion video signal) adopts two-dimentional brightness/chroma separator 420 to finish brightness and chroma mask work.In order to promote image quality, handle so give many picture frames brightness/chroma separator 410 with static video signal (stillvideo signal).Many picture frames brightness/chroma separator 410 receives picture frame F in the composite color television signal simultaneously
M+1, F
m, F
M-1And F
M-2The sampling data, and utilize in the adjacent picture frame property association in time between each corresponding picture element to carry out that brightness/chroma is separated and output separates video signal 411.Judge that composite color television signal 401 is that dynamically the work of (motion) or static (still) then is responsible for by moving detector 430.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, judge that according to this moving/quiet state of picture element and output selects signal 431, its decision method such as above-mentioned does not repeat them here.Blender 450 is promptly selected to separate video signals 421, is separated video signal 411 or the two is mixed according to predetermined ratio according to selection signal 431, and exports and separate video signal 451.
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, but every 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 (9)
1, the method for mobile detection in the video decoded device of a kind of three-dimensional comb type filtering is applicable to a NTSC system, it is characterized in that this method comprises the following steps:
The composite color television signal of taking a sample, obtaining and temporary most sampling data FmPx, y, FmPx wherein, y represents 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; And
Utilize Fm+1Px, y, FmPx, y, Fm-1Px, y and Fm-2Px, y judge the moving/quiet state of this composite color television signal.
2, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 1 filtering is characterized in that comprising the following steps: the step of moving/quiet state of this composite color television signal of wherein said judgement
Utilize Fm+1Px, y, FmPx, y, Fm-1Px, y and Fm-2Px, y calculate and obtain most maximum difference MDx, y, and MDx wherein, y represents the maximum difference of y capable picture element of x;
The maximum difference of optional 4 adjacent picture elements also calculates its mean value, obtaining most moving characteristic value MFx, and y, MFx wherein, y represents the moving characteristic value of y capable picture element of x; And
Detect MFx, y is to judge the moving/quiet state of y the picture element that x is capable in this composite color television signal.
3, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 2 filtering, the step that it is characterized in that this composite color television signal of wherein said sampling 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.
4, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 3 filtering is characterized in that wherein said calculating MDx, and y is according to formula:
MDx，y＝Max{|FmPx，y-Fm-2Px，y|，|Fm+1Px，y-Fm-1Px，y|}。
5, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 4 filtering is characterized in that wherein said acquisition MFx, and the step of y comprises the following steps:
Optional comprise MDx, the maximum difference of 4 adjacent picture elements of y also calculates its mean value, obtains most average maximum difference AMDx, h, and AMDx wherein, h represents the average maximum difference of h capable picture element of x, and h is a positive integer, and its calculating is according to formula:
AMDx, and h=(MDx, h+MDx, h+1+MDx, h+2+MDx, h+3)/4; And
In those average maximum differences, get its minimum value, and obtain a moving characteristic value MFx, y, MFx wherein, y represents the moving characteristic value of y capable picture element of x.
6, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 5 filtering is characterized in that wherein saidly getting its minimum value and obtain MFx in those average maximum differences, and the step of y is according to formula:
MFx，y＝Min(AMDx，y，AMDx，y-1，AMDx，y-2，AMDx，y-3)。
7, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 5 filtering is characterized in that wherein saidly getting its minimum value and obtain MFx in those average maximum differences, and the step of y is according to formula:
MFx，y＝Min(AMDx，y，AMDx，y-3)。
8, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 5 filtering, it is characterized in that wherein said detection MFx, y comprises the following steps: with the step of moving/quiet state of judging x is capable in this composite color television signal y picture element
One critical value is provided; And
MFx relatively, y and this critical value are worked as MFx, and y judges x is capable in this composite color television signal y picture element during greater than this critical value for dynamically, otherwise then is static state.
9, the method for mobile detection in the video decoded device of three-dimensional comb type according to claim 8 filtering is characterized in that wherein said those moving characteristic values MFx, and y is the moving characteristic value of m picture frame.
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