CN1949831A - Method, device and display for detecting television movie mode - Google Patents
Method, device and display for detecting television movie mode Download PDFInfo
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- CN1949831A CN1949831A CN 200610138752 CN200610138752A CN1949831A CN 1949831 A CN1949831 A CN 1949831A CN 200610138752 CN200610138752 CN 200610138752 CN 200610138752 A CN200610138752 A CN 200610138752A CN 1949831 A CN1949831 A CN 1949831A
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Abstract
The invention discloses a telecine signal detecting method, comprising the steps of: A. calculating primary absolute difference between interleaved scanning signals of the (n+2)th and nth frames and according to the primary absolute difference, obtaining a 3 : 2 converted detection sequence; simultaneously, according to two adjacent primary absolute differences, calculating secondary absolute difference and according to the secondary absolute difference, obtaining a 2 : 2 converted detection sequence; B. determining whether the obtained detection sequences accord with the respective standard detection sequences: if yes, it is a telecine signal corresponding to the standard detection sequences; otherwise it is a non-telecine signal. And the invention alos advances a telecine signal detecting device and display. And the invention can effectively improve telecine signal detection accuracy.
Description
Technical field
The present invention relates to image processing field, particularly a kind of method, device and display that detects television movie mode.
Background technology
Release of an interleave technology in the Video processing is meant the treatment technology that interleaved field pattern is converted into the frame figure that lines by line scan.And the telecine technology is a method of utilizing the field to duplicate, the movies signals of lining by line scan of 24 frame/seconds is converted to interleaved TV signal, thereby has realized scanning the requirement of watching the movie program of lining by line scan on the TV in normal interlaced.
At present the interlaced scan tv signaling mode that is adopted by most countries mainly comprise 60/second with (the National Television System Committee of NTSC, NTSC) Ming Ming colour television standard TV signal and 50 s'/second line-by-line inversion (Phase AlternationLine, PAL) colour television standard TV signal.The method that movies signal is converted to TSC-system formula TV signal is called 3:2 conversion (pulldown), its conversion schematic diagram as shown in Figure 1, the box indicating movies signal frame of band letter, the TV signal field that the box indicating of band letter and number is split into by the movies signal frame, white background is represented odd field, represents even field at the bottom of the oblique line.A, B, C, D, E are the moving-picture frame of playing continuously, during conversion, frame A are splitted into field A1 that comprises all odd-numbered line pixels of frame A and the field A2 that comprises all even number line pixels of frame A; Frame B is splitted into field B1 that comprises all odd-numbered line pixels of frame B and the field B2 that comprises all even number line pixels of frame B, and field B1 is copied as a B1 ' be placed on after the B2; Frame C is splitted into field C1 that comprises all even number line pixels of frame C and the field C2 that comprises all odd-numbered line pixels of frame C; Frame D is splitted into field D1 that comprises all even number line pixels of frame D and the field D2 that comprises all odd-numbered line pixels of frame D, and field D1 is copied as a D1 ' be placed on after the D2.Then adopt the processing of similar frame A for frame E, then the rest may be inferred afterwards, and the continuous movies signal of per 4 frames is converted to 10 continuous TV signal.
The method that movies signal is converted to pal television signa is called the 2:2 conversion, and it changes schematic diagram as shown in Figure 2, and wherein the implication of each symbol is consistent with Fig. 1.During conversion, frame A is splitted into field A1 that comprises all odd-numbered line pixels of frame A and the field A2 that comprises all even number line pixels of frame A,, all handle in such a manner for each frame thereafter.24 frames/second playback rate the frequency multiplication that is equivalent to like this film is 48 times/second, and when playing with 50/second speed with pal mode, the speed ratio cinema that televises is fast 1/24, but does not influence viewing effect.
Continual renovation along with TV tech, progressive-scan tv begins to popularize, in order on progressive-scan tv, to watch telecine, the best approach is the duplicate field in the deletion TV set film signal, and it is reverted to progressive scanned video stream of 24 original frame/seconds, carry out suitable frame per second conversion again and obtain the movies signal of lining by line scan, this is commonly called the film mode of release of an interleave technology.
Yet in actual applications, the video flowing that need carry out the scan video of normal interlaced often stream, telecine video flowing and other kinds that release of an interleave handles interts the mixed video stream that forms mutually, needs to adopt corresponding release of an interleave pattern for the interlaced scanning video stream of each type wherein.Therefore need detect in real time mixed video stream, so that when finding TV set film signal, in time switch on the film mode of release of an interleave, just can recover the mute quality to the full extent, thereby the impression that makes people obtain the film image quality on TV becomes possibility.This technology that detects TV set film signal in mixed video stream is called as the TV set film signal digital detecting technique.
The basic structure of the existing device that is used to detect TV set film signal as shown in Figure 3.This field data that absolute difference computation device 302 calculates by the outside input reaches the absolute difference sum (SAD) of the preceding field data same position of being imported by memory 301 or calculates so-called motion vector; Result of calculation is sent to comparison detector 303; Compare detector 303 according to absolute difference sum or motion vector calculation absolute change amount, and absolute change amount between continuous field is quantified as one group of field sequential value and imports film mode determining device 304; Film mode determining device 304 will compare from the field sequence and the pattern field sequential value that compare detector 303, judge according to comparative result whether the picture signal of input is television movie mode.Fig. 4 is the calculating principle schematic of absolute difference computation device 302.The data value of the every pixel representative of coded representation in the diagram lattice.Absolute difference sum (SAD), be exactly resolution be absolute difference between the field of pixel on adjacent two same positions of m * n, promptly ask
Based on the various TV set film signal detection schemes of said method, generally can judge the TV set film signal in the television video transmission signals, but wide, the deficiencies such as accuracy is not high, low-response, treatment of details difference of adaptability are all being arranged in varying degrees.Reason mainly contains following two aspects:
One, shortage is to the statistics and the analysis of absolute difference.
Absolute difference is a most important basis for estimation in the film mode testing process, and can accurately gather, analyse in depth be one of key point of film mode detection accuracy.The prior art scheme is handled simple to absolute difference, as only calculating the pixel absolute difference of adjacent play, owing to adjacent play polarity difference, do not have the pixel of same coordinate, so result of calculation is also more coarse.
Two, do not have careful analysis 3:2 conversion (pulldown) and the characteristics that 2:2 changes, carry out differentiated treatment.
The 3:2 conversion is two kinds of different TV set film signal patterns with the 2:2 conversion, and difference is very big.Prior art is often adopted in a like fashion and is detected, and does not adopt the relevant detection mode at its characteristics, causes accuracy of detection not ideal enough.
Summary of the invention
In view of this, the objective of the invention is to, propose a kind of method that detects TV set film signal, can greatly improve the accuracy that detects TV set film signal.This method comprises the steps:
The one-level absolute difference of the interleaved signal of A, calculating n+2 field and n field obtains the detection sequence that 3:2 changes according to gained one-level absolute difference; Obtain the detection sequence that 2:2 changes simultaneously according to adjacent twice one-level absolute difference computation secondary absolute difference, and according to described secondary absolute difference; Wherein n is a nonnegative integer;
B, judge that gained detects sequence and whether meets corresponding standard detection sequence,, judge that then described interleaved signal is a 3:2 conversion TV set film signal if meet the standard detection sequence of 3:2 conversion; If meet the standard detection sequence of 2:2 conversion, judge that then described interleaved signal is a 2:2 conversion TV set film signal.
The object of the invention also is, proposes a kind of device that detects TV set film signal, can greatly improve the accuracy that detects TV set film signal.This device comprises:
Signal storage is used for the interleaved signal of n field, n+1 field and the n+2 field of storage order input, and the interleaved signal of being stored is sent to the absolute difference computation device; The line synchronizing signal of described field signal and row synchronizing signal are sent to ranks reach the absolute difference control unit synchronously;
The absolute difference computation device is used to calculate the one-level absolute difference between n+2 field and the n field, according to continuous two one-level absolute difference computation secondary absolute differences, and gained one-level absolute difference and secondary absolute difference is sent to sequential detector;
Sequential detector is used for according to the one-level absolute difference output 3:2 transition detection sequence of being received, according to the secondary absolute difference output 2:2 transition detection sequence of being received;
The film mode determining device, be used for judging according to the 3:2 transition detection sequence of sequential detector output whether field signal is 3:2 conversion TV set film signal, judge according to the 2:2 transition detection sequence of sequential detector output whether field signal is 2:2 conversion TV set film signal.
Another purpose of the present invention is, proposes a kind of display, can accurately detect TV set film signal, TV set film signal is changed and is shown according to testing result.This display comprises:
The TV set film signal detecting unit is used to receive interleaved signal, detects the television movie mode of described interleaved signal, specifically comprises:
Signal storage is used for the interleaved signal of n field, n+1 field and the n+2 field of storage order input, and the interleaved signal of being stored is sent to the absolute difference computation device; The line synchronizing signal of described field signal and row synchronizing signal are sent to ranks reach the absolute difference control unit synchronously;
The absolute difference computation device is used to calculate the one-level absolute difference between n+2 field and the n field, according to continuous two one-level absolute difference computation secondary absolute differences, and gained one-level absolute difference and secondary absolute difference is sent to sequential detector;
Sequential detector is used for according to the one-level absolute difference output 3:2 transition detection sequence of being received, according to the secondary absolute difference output 2:2 transition detection sequence of being received;
The film mode determining device, be used for judging according to the 3:2 transition detection sequence of sequential detector output whether field signal is 3:2 conversion TV set film signal, judge according to the 2:2 transition detection sequence of sequential detector output whether field signal is 2:2 conversion TV set film signal, and send corresponding switch-over control signal according to judged result;
The scene switch unit is used for the switch-over control signal from the TV set film signal checkout gear, will adopt corresponding release of an interleave pattern from the interleaved signal of signal source, is converted to progressive-scan signal and output;
Display unit shows according to described progressive-scan signal.
As can be seen from the above technical solutions, because the present invention program has following technique effect:
One, adopt more careful absolute difference statistical and analytical method, because the n field is identical with n+2 field polarity, promptly be all odd field or even field, calculate the absolute difference of same coordinate pixel between the identical play of polarity, result calculated is more accurate like this;
Two, to the TV set film signal differentiating and processing of 3:2 conversion and 2:2 conversion, calculate the detection sequence of these two kinds of television movie modes respectively, the 3:2 transition detection sequence and the standard 3:2 transition detection sequence that calculate are compared, the 2:2 transition detection sequence and the standard 2:2 transition detection sequence that calculate are compared, computational methods are pointed like this, so accuracy rate is higher.
Description of drawings
Fig. 1 is a 3:2 transfer principle schematic diagram;
Fig. 2 is a 2:2 transfer principle schematic diagram;
Fig. 3 is the TV set film signal checkout gear block diagram of prior art;
Fig. 4 is the schematic diagram calculation of the absolute difference computation device in the TV set film signal checkout gear shown in Figure 3;
Fig. 5 detects the schematic diagram of 3:2 conversion TV set film signal for the embodiment of the invention;
Fig. 6 detects the schematic diagram of 2:2 conversion TV set film signal for the embodiment of the invention;
Fig. 7 is the device block diagram of the detection television movie mode of the embodiment of the invention;
Fig. 8 pays close attention to the schematic diagram of scope for human eye;
Fig. 9 judges state transition graphs for continuous 10 detection sequences in the detection of embodiment of the invention 3:2 conversion television movie mode;
Figure 10 is the structured flowchart of embodiment of the invention display;
Figure 11 detects the general flow chart of television movie mode for the present invention;
Figure 12 detects the flow chart of 3:2 conversion television movie mode for the present invention;
Figure 13 detects the flow chart of 2:2 conversion television movie mode for the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is further elaborated below in conjunction with accompanying drawing.
The principle that the present invention checks 3:2 conversion TV set film signal as shown in Figure 5, to go up two correspondence position pixel adjacent and that parity is identical time subtracts each other, for example Fig. 5 midfield A1 subtracts each other with a B1, and a B2 and a C1 subtract each other, and the absolute value of difference is as the pixel absolute difference; (Noise Threshold 32 NT32) relatively, if more than or equal to noise gate NT32, then is taken as a kind of mode bit with the value of the detection sequence of this pixel absolute difference correspondence and for example is taken as 1 with gained pixel absolute difference and the noise gate 32 that sets in advance again; If less than noise gate NT32, then the value of the detection sequence of this pixel absolute difference correspondence is taken as opposite mode bit and for example is taken as 0.Because 3:2 changes the film mode feature, the 3rd of strange field is identical with the 5th in continuous ten field data, and even the 8th identical with the 10th, so the obvious characteristic with 11110 circulations can appear in gained detection sequence.Have such feature if find to detect sequence, then decidable is a 3:2 conversion TV set film signal.Owing to have a noise inevitably, even the absolute difference between the duplicate field also can not be zero, noise gate 32 effects are exactly that absolute difference is judged to be duplicate field less than two of this thresholding, and other are judged to be non-duplicate field.
The principle that the present invention detects 2:2 conversion TV set film signal goes up two correspondence position pixel adjacent and that parity is identical with the time and subtracts each other as shown in Figure 6, and the absolute value of its difference is an one-level pixel absolute difference; Adjacent one-level pixel absolute difference is remake difference, and its absolute value is a secondary pixel absolute difference; With the noise gate of secondary pixel absolute difference and the 2:2 that sets in advance conversion (Noise Threshold 22, NT22) relatively, if more than or equal to noise gate NT22, then the value with the detection sequence of this secondary pixel absolute difference correspondence is taken as 1; If less than noise gate NT22, then the value with the detection sequence of this secondary pixel absolute difference correspondence is taken as 0.Because 2:2 conversion TV set film signal strange one-level absolute difference sample distribution with idol in four field data that adjacent two frames change into is identical, so detects sequence and can occur 1 and 0 and such obvious characteristic alternately occurs.Have such feature if find to detect sequence, then decidable is a 2:2 conversion TV set film signal.
According to above-mentioned principle, the device that the present invention detects television movie mode as shown in Figure 7, thick arrow is represented vision signal, thin arrow is represented the signal except that vision signal, this device comprises as the lower part:
Ranks reach absolute difference control unit 720 synchronously, are used for according to line synchronizing signal Hs and the row synchronizing signal Vs from the signal storage 710 that are received, calculate the ranks value; Regional selection function is provided, the surveyed area of different brackets is set, and the corresponding detection density value of surveyed area of setting and each grade; With the detection density value of described surveyed area and each surveyed area correspondence as detecting configuration parameter, generate according to detecting configuration parameter that absolute difference computation control enables (SAD_EN) and statistical computation enables (STA_EN), and export the SAD_EN that generated and STA_EN in the absolute difference computation device 730 one-level absolute difference analytic unit 731.Wherein, the assignment rule of SAD_EN is: according to described detection configuration parameter, judging whether the current pixel coordinate is the pixel coordinate that need detect, if then SAD_EN is 1, otherwise is 0.The assignment rule of STA_EN is: judging that whether the current pixel coordinate is last pixel coordinate that need detect in the image, if STA_EN is 1, otherwise is 0.
Because the concern of human eye is limited in scope, the most concern scopes of human eye only concentrate near the zone of image golden section point for sign of w * h, showing that as Fig. 8 the zone of intermediate mesh pattern representative, this scope only account for the about 1/3 of entire image area, is the key area of video image.The present invention program around this principle is divided into key area, non-key area and surveyed area not with the surveyed area in the image.For example pointwise check is set than high detection density in the key area; Non-key area is provided with the low density that detects, and detects a pixel in for example per 3 * 3 the block of pixels; Surveyed area does not detect.Wherein can also further segment various detection density in key area and the non-key area, thereby be divided into multi-level subregion.So not only can save computational resource, also can reduce to influence the accuracy of detection greatly owing to the interference of non-key area.
Absolute difference computation device 730 comprises one-level absolute difference analytic unit 731 and secondary absolute difference analytic unit 732.One-level absolute difference analytic unit 731 is used to calculate the specified n field of absolute difference computation control enable signal SAD EN and the capable t row of the s pixel value D of n+2 field
n(s, t) and D
N+2(s, one-level absolute difference SAD t) (s, t)=| D
n(s, t)-D
N+2(s, t) |.In the one-level absolute difference analytic unit 731 a plurality of counters are set also, are used for respectively that (s, t) number that is in different scopes is counted to SAD.In the embodiment of the invention, be provided with 8 counter Cs1, Cs2 ... Cs8 is respectively applied for that (s, t) number that is in 0～31,32～63,64～95,96～127,128～159,160～191,192～223,224～255 scopes is counted to SAD.When receiving statistical computation enable signal STA EN, with the one-level absolute difference sample counting of n field and n+2 field as a result CR (Cs1, Cs2, Cs3, Cs4, Cs5, Cs6, Cs7, Cs8) be sent to secondary absolute difference analytic unit 732.According to the mean value of CR first order calculation absolute difference, as shown in Equation (1):
Wherein, ∑ is represented summation, and the pixel count of being added up is exactly the sum of all pixels of coincidence detection configuration parameter in the n field.Then averaging of income value Cs is sent to the 3:2 Sequence Detection unit 741 of sequential detector 740.The number of the above counter and to SAD (s, t) division of span only is a kind of example, can adjust flexibly according to actual needs.
Secondary absolute difference analytic unit 732 generates secondary absolute difference sample counting CM (SAD2_1, SAD2_2, SAD2_3, SAD2_4, SAD2_5, SAD2_6, SAD2_7, SAD2_8) as a result according to the one-level absolute difference sample counting of being received CR (Cs1, Cs2, Cs3, Cs4, Cs5, Cs6, Cs7, Cs8) as a result.Generate CM (SAD2_i, i=1,2 ... 8) concrete grammar be: calculate this one-level absolute difference sample counting of receiving CR and the last one-level absolute difference sample counting of receiving absolute difference of CR ' as a result as a result, make SAD2_i=|Csi-Csi ' |, (i=1,2 ... 8), so just obtained CM, calculate the mean value of secondary absolute difference then according to CM, as shown in Equation (2)
SAD2 is sent to the 2:2 Sequence Detection unit 742 of sequential detector 740.
Specifically, 3:2 Sequence Detection unit 741 receives the one-level absolute difference mean value Cs that one-level absolute difference analytic unit 731 calculates, and configurable threshold value THR32 judges with register.If it is 0 that Cs＜THR32 then puts the current sequence value, otherwise puts 1.Record is 10 sequential values of generation recently, and add the parity field id signal in highest order, and one that is defined as the 3:2pulldown television movie mode is detected sequence SEQ32[10:0].Next constantly repeat above-mentioned steps, whenever receive a CR with the sequential value of current generation and continuous nine sequential values that generate before combine just obtain one and detect sequence SEQ32[10:0].With the detection sequence SEQ32[10:0 that is generated] export the 3:2 film mode judging unit 751 in the film mode determining device 750 to.In addition, static thresholding is set, less than static thresholding, then 3:2 conversion television movie mode standard detection sequence SEQ32_STD[10:0 is directly exported in 3:2 Sequence Detection unit 741 as if the Cs that has been in 3:2 conversion release of an interleave pattern and has received continuously].The 3:2 transfer standard detects sequence SEQ32_STD[10:0] (1,2,3...10) be: 10111101111,01111011110,11110111101,01101111011,11011110111,00111101111,11111011110,01110111101,11101111011,01011110111, wherein a high position is fixed as parity field sign position; Being converted into 16 system data is 5EF, 3DE, 7BD, 3FB, 6F7,1EF, 7DE, 3BD, 77B, 2F7.
2:2 Sequence Detection unit 742 receives the secondary absolute difference mean value SAD2 that secondary absolute difference analytic unit 732 calculates, configurable threshold value THR22 judges with register, the mode of judgment mode and 3:2 Sequence Detection unit 741 is similar, whenever receive a SAD2, the sequential value of current generation and six sequential values that generate are continuously before combined just obtain a 2:2 conversion television movie mode and detect sequence SEQ22[7:0], with the detection sequence SEQ22[7:0 that is generated] export the 2:2 film mode judging unit 752 in the film mode determining device 750 to.This unit is provided with static threshold equally, if the SAD2 that has been in 2:2 conversion release of an interleave pattern and has received continuously is less than static thresholding, then 2:2 Sequence Detection unit 742 is directly exported the 2:2 transfer standard and is detected sequence SEQ22_STD[7:0] (1,2) be 10101010,01010101, wherein a high position is fixed as parity field sign position, and being converted into 16 system data is AA, 55.
Film mode determining device 750, comprise 3:2 film mode judging unit 751 and 2:2 film mode judging unit 752, be respectively applied for according to detecting sequence to judge whether the interleaved signal of this device of input is 3:2 conversion TV set film signal or 2:2 conversion TV set film signal, and judged result is sent to scene switch unit 760.
Specifically, 3:2 film mode receiving element 751 will be from the detection sequence SEQ32[10:0 of 3:2 Sequence Detection unit 741] order and standard sequence SEQ32_STD[10:0] (1,2,3..10) relatively calculate one by one.Figure 9 shows that continuous 10 are detected sequence judgement state transition graph.To detect sequence SEQ32[10:0] with the standard generic sequence first number 5EF by turn with or after again the summation, if summed result TM is 11 o'clock, show that the current detection sequence is identical with standard order initial value, put 3:2 film mode index signal film_en32 for high and enter the Sequence Detection process and play primary state S_5EF.After this order by the standard sequence array relatively detects sequence code SEQ32[10:0] and standard sequence SEQ32_STD[10:0] (1,2,3..10), with the standard sequence group carry out by turn with or read group total as a result TM equal 11 and think that input traffic still is the 3:2 film mode, put the film_en32 signal for high.If result of calculation TM is less than 11 then to put the film_en32 signal be low.When rest image occurring in the TV set film signal since in the 3:2 Sequence Detection unit 741 according to the judgment rule outputting standard sequence SEQ32_STD[10:0 of static thresholding], then the film_en32 signal still remains height.
If in the 3:2 Sequence Detection unit 741 static thresholding is not set, then when rest image occurring in the TV set film signal, 3:2 film mode receiving element 751 will receive to be 0 detection sequence continuously.In this case, the correctness that detects for guaranteeing can be introduced auxiliary rest image detection procedure: occur if the film_en32 signal is a height, then still remaining height when being 0 situation continuously if detect sequence in 3:2 film mode receiving element 751.The principle of 2:2 film mode judging unit 752 and processing procedure change SEQ22_STD[7:0 into 3:2 film mode judging unit 751 identical just standard sequences] (1,2).
Comprise above-mentioned TV set film signal checkout gear display block diagram as shown in figure 10, comprise following part:
Signal source 1001 is used to provide interleaved signal, and described interleaved signal can be to receive from the outside, for example receives wireless signal or receives by Wireline, and perhaps the memory device by signal source 801 self provides.
TV set film signal checkout gear 1002, be used for the interleaved signal that sensed signal sources 1001 is provided, generate 3:2 transition detection sequence and 2:2 transition detection sequence respectively according to described interleaved signal, and detect sequences with generated two kinds and compare with corresponding standard detection sequence respectively, judge according to comparative result whether described interleaved signal is TV set film signal, and send switching signal, a sequence number and ranks synchronizing signal to scene switch unit 1003 according to judged result.Described switching signal, a sequence number and ranks synchronizing signal can be referred to as switch-over control signal.
Scene switch unit 1003, be used for according to switching signal, a sequence number and ranks synchronizing signal from TV set film signal checkout gear 1002, to adopt corresponding release of an interleave pattern from the interleaved signal of signal source, and be converted to progressive-scan signal and export display unit 1004 to.Specifically, when scene switch unit 1003 is received switching signal, judge that at first this switching type is the switching signal of what type, for example be that non-TV set film signal is switched to 3:2 conversion TV set film signal, then with the field of current field sequence number of receiving and ranks synchronizing signal correspondence as initial that switches, adopt 3:2 to change the release of an interleave pattern to described initial and afterwards interleaved signal and handle.
The progressive-scan signal that display unit 1004 is used for receiving is converted to video image and shows.
If described TV set film signal checkout gear 1002 adopts internal structure shown in Figure 7, then the function of scene switch unit 1003 is specific as follows:
Count the film_en32 signal respectively and be high number CNT_film32 and the continuous high number CNT_film22 of being of film_en22 signal continuously, if CNT_film32 is greater than the incision threshold value THR1_film that sets in advance, then according to the ranks synchronizing signal HS, the Vs that reach absolute difference control unit 720 from ranks synchronously and definite initial of switching of a sequence number, and, be 3:2 conversion release of an interleave pattern with the release of an interleave mode switch from described initial; If CNT_film22 is greater than incision threshold value THR1_film, then same initial of determining to switch, and to begin the release of an interleave mode switch from described initial field be 2:2 conversion release of an interleave pattern.When if current release of an interleave pattern is 3:2 conversion release of an interleave pattern, then count film_en32 and be low number UCNT_film32 continuously, if UCNT_film32 cuts out threshold value THR2_film greater than what set in advance, and do not satisfy CNT_film22 greater than incision threshold value THR1_film, then determine to switch initial, and to begin the release of an interleave mode switch from described initial field be the release of an interleave pattern of normal tv signal; When if current release of an interleave pattern is 2:2 conversion release of an interleave pattern, then count film_en22 and be low number UCNT_film22 continuously, if UCNT_film22 cuts out threshold value THR2_film greater than what set in advance, and do not satisfy CNT_film32 greater than incision threshold value THR1_film, then determine to switch initial, and to begin the release of an interleave mode switch from described initial field be the release of an interleave pattern of normal tv signal.The reason that scene switch unit 1003 carries out above-mentioned design is that TV set film signal may exist bad that does not meet standard sequence in editing process, if, may occur because bad existence causes unnecessary handoff procedure once finding that the detection sequence does not meet standard sequence and switches.
In the embodiment of the invention, carry out the detection of the television movie mode and the television movie mode that 2:2 changes of 3:2 conversion simultaneously, its main-process stream comprises the steps: as shown in figure 11
Step 1101: calculate the n+2 field of input and the one-level absolute difference of n field signal, obtain the detection sequence SEQ32[10:0 of 3:2 conversion according to gained one-level absolute difference]; And go out the secondary absolute difference according to the one-level absolute difference computation, obtain the detection sequence SEQ22[7:0 of 2:2 conversion according to gained secondary absolute difference];
Step 1102: judge that gained detects sequence SEQ32[10:0] or SEQ22[7:0] whether meet corresponding standard detection sequence, if then switch to the release of an interleave pattern of corresponding TV set film signal, otherwise jump out the release of an interleave pattern of TV set film signal.
Wherein, the detection step of the television movie mode of 3:2 conversion comprises the steps: as shown in figure 12
Step 1201: judge that coordinate is that (s, pixel t) is the coincidence detection configuration parameter whether, if then calculate the pixel value D on this coordinate in n field and the n+2 field
n(s, t) and D
N+2(s, the absolute value SAD of difference t) (s, t)=| D
n(s, t)-D
N+2(s, t) |, with m initial value be 0 counter (Cs1, Cs2 ... Csm) respectively to the SAD of different spans (institute of traversal s, t might value for s, t) counting, obtain one-level absolute difference sample counting as a result CR (CS1, Cs2 ..., Csm).
Step 1202: CR generation as a result detects sequence according to gained one-level absolute difference sample counting, comprises the steps:
Step 1202a: according to CR and formula (1) first order calculation absolute difference mean value Cs;
Step 1202b: gained Cs and the threshold value THR32 that sets in advance are compared, if Cs＜THR32 is changed to 0 with the current sequence value, otherwise is changed to 1;
Step 1202c: judge the current 3:2 conversion release of an interleave pattern that whether is in,, otherwise go to step 1202e if carry out 1202d;
Step 1202d: judge whether sequential value is 0 continuously, if output 3:2 transfer standard detects sequence SEQ32_STD[10:0] (1,2,3...10) and end step 1202, otherwise execution in step 1202e;
Step 1202e: continuous 10 sequential values are arranged in order, and the parity flag position are set, generate 3:2 transition detection sequence in highest order.
Step 1203: relatively gained detects sequence set SEQ32[10:0] with standard detection sequence set SEQ32_STD[10:0], the sequential value in detecting sequence set is " 1F ", when promptly identical with first sequential value in the standard detection sequence set, enters detected state;
Step 1204: will detect sequence set SEQ32[10:0] sequential value and standard detection sequence set SEQ32_STD[10:0] sequential value compare successively, when the number of times CNT_film32 that meets mutually continuously reaches incision threshold value THR1_film, be judged to be 3:2 conversion television movie mode, switch to the release of an interleave pattern of 3:2 conversion;
Step 1205: will detect sequence set SEQ32[10:0] sequential value and standard detection sequence set SEQ32_STD[10:0] sequential value compare successively, when the number of times UCNT_film32 that is not inconsistent continuously reaches when cutting out threshold value THR_2film, jump out the release of an interleave pattern of 3:2 conversion.
The detection step of the television movie mode of 2:2 conversion comprises the steps: as shown in figure 13
Step 1301: judge coordinate be (s, whether pixel t) the coincidence detection configuration parameter, if, then calculate n field and n+2 field in pixel value D on this coordinate
n(s, t) and D
N+2(s, the absolute value SAD of difference t) (s, t)=| D
n(s, t)-D
N+2(s, t) |, with m initial value be 0 counter (Cs1, Cs2 ... Csm) respectively to the SAD of different spans (institute of traversal s, t might value for s, t) counting, obtain one-level absolute difference sample counting as a result CR (CS1, Cs2 ..., Csm).
Step 1302: the absolute difference SAD2_i=|CSi-CSi ' that calculates continuous two one-level absolute difference sample counting results |, (i=1,2 ..., m), obtain secondary absolute difference sample counting as a result CM (SAD2_1, SAD2_2 ..., SAD2_m);
Step 1303: calculate 2:2 transition detection sequence according to CM, comprise the steps:
Step 1303a: the mean value that calculates the secondary absolute difference according to CM
Step 1303b: gained SAD2 and the threshold value THR22 that sets in advance are compared, if SAD2＜THR22 is changed to 0 with the current sequence value, otherwise is changed to 1;
Step 1303c: judge the current 2:2 conversion release of an interleave pattern that whether is in,, otherwise go to step 1303e if carry out 1303d;
Step 1303d: judge whether sequential value is 0 continuously, if output 2:2 transfer standard detects sequence SEQ22_STD[2:0] (1,2) and end step 1303, otherwise execution in step 1303e;
Step 1303e: continuous 7 sequential values are arranged in order, and the parity flag position are set, generate 2:2 transition detection sequence in highest order.
Step 1304: relatively gained detects sequence set SEQ22[7:0] with standard detection sequence set SEQ22_STD[7:0], the sequential value in detecting sequence set is " AA ", when promptly identical with first sequential value in the standard detection sequence set, enters detected state;
Step 1305: will detect sequence set SEQ22[7:0] sequential value and standard detection sequence set SEQ22_STD[7:0] sequential value compare successively, when the number of times CNT_film22 that meets mutually continuously reaches incision threshold value THR1_film, be judged to be 2:2 conversion television movie mode, switch to the release of an interleave pattern of 2:2 conversion;
Step 1306: will detect sequence set SEQ22[7:0] sequential value and standard detection sequence set SEQ22_STD[7:0] sequential value compare successively, when the number of times UCNT_film22 that is not inconsistent continuously reaches when cutting out threshold value THR2_film, jump out the release of an interleave pattern of 2:2 conversion.
As can be seen from the above embodiments, the beneficial effect of the TV set film signal detection scheme that proposes of the present invention with following several respects:
Pay attention to the collection mode in data to be tested source, can reduce the error of calculation effectively;
Emphasize statistical analysis, to improve accuracy and the adaptability that TV set film signal detects to absolute difference;
Figure subregion detection method is proposed to improve separating capacity to image detail;
Clearly to two kinds of different television movie mode differentiating and processing of 3:2 conversion and 2:2 conversion, with strong points, accuracy rate is inevitable higher.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1, a kind of method that detects TV set film signal is characterized in that, this method comprises the steps:
The one-level absolute difference of the interleaved signal of A, calculating n+2 field and n field obtains the detection sequence that 3:2 changes according to gained one-level absolute difference; Obtain the detection sequence that 2:2 changes simultaneously according to adjacent twice one-level absolute difference computation secondary absolute difference, and according to described secondary absolute difference; Wherein n is a nonnegative integer;
B, judge that gained detects sequence and whether meets corresponding standard detection sequence,, judge that then described interleaved signal is a 3:2 conversion TV set film signal if meet the standard detection sequence of 3:2 conversion; If meet the standard detection sequence of 2:2 conversion, judge that then described interleaved signal is a 2:2 conversion TV set film signal.
2, method according to claim 1, it is characterized in that, the described detection sequence that obtains 3:2 conversion according to gained one-level absolute difference comprises: with described one-level absolute difference and first noise gate that sets in advance relatively, if the one-level absolute difference less than first noise gate, then is changed to current mark bit a kind of mode bit otherwise is changed to opposite mode bit; Obtain the detection sequence of 3:2 conversion according to the gained flag bit;
The described detection sequence that obtains 2:2 conversion according to gained secondary absolute difference comprises: with described secondary absolute difference and second noise gate that sets in advance relatively, if the secondary absolute difference less than second noise gate, then is changed to current mark bit a kind of mode bit otherwise is changed to opposite mode bit; Obtain the detection sequence of 2:2 conversion according to the gained flag bit.
3, method according to claim 1 is characterized in that, sets in advance m initial value and is 0 counter and detect configuration parameter, and the one-level absolute difference of calculating n+2 field and n field signal described in the steps A comprises:
Judge that s is capable, whether the pixel of t row meets described detection configuration parameter, if, then calculate n field and n+2 field in the absolute difference of pixel on this coordinate, with m initial value is that 0 counter is respectively to the absolute difference counting of different spans, after the pixel of all coincidence detection configuration parameters is all finished aforementioned calculation in to above-mentioned two, obtain one-level absolute difference sample counting CR as a result.
4, method according to claim 3 is characterized in that, the described detection sequence that obtains 3:2 conversion according to gained one-level absolute difference comprises:
A11, by described one-level absolute difference sample counting CR as a result, according to formula
Calculate the mean value Cs of one-level absolute difference, wherein Csi is the count value of i counter, 1≤i≤m;
A12, with gained Cs and the 3:2 transition detection threshold value THR32 that sets in advance relatively is if Cs＜THR32 is changed to 0 with the current sequence value, otherwise is changed to 1;
A13, continuous 10 sequential values are arranged in order, and the parity flag position are set, generate 3:2 transition detection sequence in highest order.
5, method according to claim 4, it is characterized in that, further comprise before the described steps A 13: judge the current 3:2 conversion release of an interleave pattern that whether is in, if, judge further then whether sequential value is 0 continuously, if then export the 3:2 transfer standard and detect sequence SEQ32_STD[10:0] as the detection sequence of 3:2 conversion; Otherwise go to steps A 13.
6, method according to claim 3, it is characterized in that, the described detection sequence that obtains 2:2 conversion according to described secondary absolute difference comprises: calculate continuous two one-level absolute difference sample counting results' absolute difference SAD2_i, obtain secondary absolute difference sample counting CM as a result; 1≤i≤m wherein;
The then described detection sequence that obtains 2:2 conversion according to described secondary absolute difference comprises:
A21, calculate the mean value of secondary absolute difference according to CM
A22, with gained SAD2 and the 2:2 transition detection threshold value THR22 that sets in advance relatively is if SAD2＜THR22 is changed to 0 with the current sequence value, otherwise is changed to 1;
A23, continuous 7 sequential values are arranged in order, and the parity flag position are set, generate 2:2 transition detection sequence in highest order.
7, method according to claim 6 is characterized in that, further comprises before the described steps A 23:
Whether judge the current 2:2 conversion release of an interleave pattern that whether is in, be 0 if then further judge sequential value, if output 2:2 transfer standard detects sequence SEQ22_STD[2:0 continuously] and go to step B; Otherwise go to steps A 23.
8, according to each described method of claim 1 to 7, it is characterized in that step B comprises:
If the described interleaved signal of original judgement is not a 3:2 conversion TV set film signal, and the detection sequence of described 3:2 conversion reaches 3:2 conversion incision threshold value CNT_film32 with the number of times that the standard detection sequence that the 3:2 that sets in advance changes meets continuously, judges that then described interleaved signal has changed 3:2 conversion TV set film signal into;
If the described interleaved signal of original judgement is a 3:2 conversion TV set film signal, and the continuous incongruent number of times of standard detection sequence of the detection sequence of described 3:2 conversion and 3:2 conversion reaches the 3:2 conversion and cuts out threshold value UCNT_film32, judges that then described interleaved signal has changed non-3:2 conversion TV set film signal into.
9, according to each described method of claim 1 to 7, it is characterized in that step B comprises:
If the described interleaved signal of original judgement is not a 2:2 conversion TV set film signal, and the detection sequence of described 2:2 conversion reaches 2:2 conversion incision threshold value CNT_film22 with the number of times that the standard detection sequence that the 2:2 that sets in advance changes meets continuously, judges that then described interleaved signal has changed 2:2 conversion TV set film signal into;
If the described interleaved signal of original judgement is a 2:2 conversion TV set film signal, and the continuous incongruent number of times of standard detection sequence of the detection sequence of described 2:2 conversion and 2:2 conversion reaches the 2:2 conversion and cuts out threshold value UCNT_film22, judges that then described interleaved signal has changed non-2:2 conversion TV set film signal into.
10, a kind of device that detects television movie mode is characterized in that, this device comprises:
Signal storage is used for the interleaved signal of n field, n+1 field and the n+2 field of storage order input, and the interleaved signal of being stored is sent to the absolute difference computation device; The line synchronizing signal of described field signal and row synchronizing signal are sent to ranks reach the absolute difference control unit synchronously;
The absolute difference computation device is used to calculate the one-level absolute difference between n+2 field and the n field, according to continuous two one-level absolute difference computation secondary absolute differences, and gained one-level absolute difference and secondary absolute difference is sent to sequential detector;
Sequential detector is used for according to the one-level absolute difference output 3:2 transition detection sequence of being received, according to the secondary absolute difference output 2:2 transition detection sequence of being received;
The film mode determining device, be used for judging according to the 3:2 transition detection sequence of sequential detector output whether field signal is 3:2 conversion TV set film signal, judge according to the 2:2 transition detection sequence of sequential detector output whether field signal is 2:2 conversion TV set film signal.
11, device according to claim 10 is characterized in that, this device further comprises:
Ranks reach the absolute difference control unit synchronously, are used for according to line synchronizing signal and the row synchronizing signal from the signal storage that are received, calculate the ranks value; Judge whether the ranks value of being calculated satisfies the detection configuration parameter that sets in advance, send absolute difference computation control enable signal SAD_EN to the absolute difference computation device according to this judged result;
Described ranks and absolute difference control unit are further used for judging that according to the ranks value of being calculated whether the current pixel coordinate is the pixel coordinate that last needs detects in the image, sends statistical computation enable signal STA_EN according to judged result to the absolute difference computation device;
Then described absolute difference computation device calculates the pixel difference absolute value according to the absolute difference computation control enable signal SAD_EN, calculating n field and the n+2 field interleaved signal that receive; When receiving statistical computation enable signal STA_EN, generate the one-level absolute difference of n field and n+2 field according to gained pixel absolute difference.
12, according to the described device of claim 11, it is characterized in that, described signal storage comprises first memory cell, second memory cell and the 3rd memory cell, be respectively applied for the field signal of n+2 field, n+1 field and the n field of storage order input, wherein first memory cell and second memory cell are sent to the absolute difference computation device to the field signal of being stored separately respectively;
Described first memory cell is further used for the line synchronizing signal of the field signal that will be stored and row synchronizing signal and is sent to described ranks and reaches the absolute difference control unit synchronously.
13, device according to claim 12 is characterized in that, described absolute difference computation device comprises:
One-level absolute difference analytic unit is used to calculate the one-level absolute difference of n field and n+2 field interleaved signal;
Secondary absolute difference analytic unit is used for according to one-level absolute difference analytic unit gained one-level absolute difference computation secondary absolute difference.
14, device according to claim 13 is characterized in that, described one-level absolute difference analytic unit comprises m counter, is respectively applied for the pixel difference absolute value that is in different spans is counted.
15, device according to claim 13 is characterized in that, described sequential detector comprises:
3:2 Sequence Detection unit is used for according to the one-level absolute difference from one-level absolute difference analytic unit, generates and output 3:2 transition detection sequence;
2:2 Sequence Detection unit is used for according to the secondary absolute difference from secondary absolute difference analytic unit, generates and output 2:2 transition detection sequence.
16, device according to claim 15 is characterized in that, described film mode determining device comprises:
3:2 film mode judging unit is used for 3:2 transition detection sequence and 3:2 transfer standard detection sequence from 3:2 Sequence Detection unit are compared, and judges according to comparative result whether described interleaved signal is 3:2 conversion TV set film signal;
2:2 film mode judging unit is used for 2:2 transition detection sequence and 2:2 transfer standard detection sequence from 2:2 Sequence Detection unit are compared, and judges according to comparative result whether described interleaved signal is 2:2 conversion TV set film signal.
17, a kind of display is characterized in that, comprising:
The TV set film signal detecting unit is used to receive interleaved signal, detects the television movie mode of described interleaved signal, specifically comprises:
Signal storage is used for the interleaved signal of n field, n+1 field and the n+2 field of storage order input, and the interleaved signal of being stored is sent to the absolute difference computation device; The line synchronizing signal of described field signal and row synchronizing signal are sent to ranks reach the absolute difference control unit synchronously;
The absolute difference computation device is used to calculate the one-level absolute difference between n+2 field and the n field, according to continuous two one-level absolute difference computation secondary absolute differences, and gained one-level absolute difference and secondary absolute difference is sent to sequential detector;
Sequential detector is used for according to the one-level absolute difference output 3:2 transition detection sequence of being received, according to the secondary absolute difference output 2:2 transition detection sequence of being received;
The film mode determining device, be used for judging according to the 3:2 transition detection sequence of sequential detector output whether field signal is 3:2 conversion TV set film signal, judge according to the 2:2 transition detection sequence of sequential detector output whether field signal is 2:2 conversion TV set film signal, and send corresponding switch-over control signal according to judged result;
The scene switch unit is used for the switch-over control signal from the TV set film signal checkout gear, will adopt corresponding release of an interleave pattern from the interleaved signal of signal source, is converted to progressive-scan signal and output;
Display unit shows according to described progressive-scan signal.
18, display according to claim 17, it is characterized in that, described television movie mode checkout gear further comprises: ranks reach the absolute difference control unit synchronously, are used for according to line synchronizing signal and the row synchronizing signal from the signal storage that are received, calculate the ranks value; Judge whether the ranks value of being calculated satisfies the detection configuration parameter that sets in advance, send absolute difference computation control enable signal SAD_EN to the absolute difference computation device according to this judged result;
Described ranks and absolute difference control unit are further used for judging that according to the ranks value of being calculated whether the current pixel coordinate is the pixel coordinate that last needs detects in the image, sends statistical computation enable signal STA_EN according to judged result to the absolute difference computation device;
Then described absolute difference computation device calculates the pixel difference absolute value according to the absolute difference computation control enable signal SAD_EN, calculating n field and the n+2 field interleaved signal that receive; When receiving statistical computation enable signal STA_EN, generate the one-level absolute difference of n field and n+2 field according to gained pixel absolute difference.
19, display according to claim 18, it is characterized in that, described signal storage comprises first memory cell, second memory cell and the 3rd memory cell, be respectively applied for the field signal of n+2 field, n+1 field and the n field of storage order input, wherein first memory cell and second memory cell are sent to the absolute difference computation device to the field signal of being stored separately respectively; Described first memory cell also is used for the line synchronizing signal of the field signal that will be stored and row synchronizing signal and is sent to described ranks and reaches the absolute difference control unit synchronously;
Described absolute difference computation device comprises: one-level absolute difference analytic unit is used to calculate the one-level absolute difference of n field and n+2 field interleaved signal; Secondary absolute difference analytic unit is used for according to one-level absolute difference analytic unit gained one-level absolute difference computation secondary absolute difference;
Described sequential detector comprises: 3:2 Sequence Detection unit, be used for according to one-level absolute difference from one-level absolute difference analytic unit, and generate and output 3:2 transition detection sequence; 2:2 Sequence Detection unit is used for according to the secondary absolute difference from secondary absolute difference analytic unit, generates and output 2:2 transition detection sequence;
Described film mode determining device comprises: 3:2 film mode judging unit, be used for and compare from the 3:2 transition detection sequence and the 3:2 transfer standard detection sequence of 3:2 Sequence Detection unit, judge according to comparative result whether described interleaved signal is 3:2 conversion TV set film signal; 2:2 film mode judging unit is used for 2:2 transition detection sequence and 2:2 transfer standard detection sequence from 2:2 Sequence Detection unit are compared, and judges according to comparative result whether described interleaved signal is 2:2 conversion TV set film signal.
20, display according to claim 19 is characterized in that, described one-level absolute difference analytic unit comprises m counter, is respectively applied for the pixel difference absolute value that is in different spans is counted.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610348A (en) * | 2008-06-16 | 2009-12-23 | 宝利微电子系统控股公司 | Detect the method and the device of multiple film mode |
| CN101087439B (en) * | 2007-07-03 | 2010-09-08 | 华为技术有限公司 | A method, device and display for detecting TV and film signals |
| CN101483790B (en) * | 2008-12-22 | 2011-01-12 | 四川虹微技术有限公司 | Movie mode video signal detection method |
| CN102104764A (en) * | 2009-12-17 | 2011-06-22 | 于培宁 | Method for compressing, storing and processing image sequence |
| CN101483745B (en) * | 2008-12-22 | 2011-11-23 | 四川虹微技术有限公司 | Video mode recognition method based on edge detection |
| CN103297740A (en) * | 2013-05-29 | 2013-09-11 | 四川长虹电器股份有限公司 | Method for eliminating pausing of display |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101087439B (en) * | 2007-07-03 | 2010-09-08 | 华为技术有限公司 | A method, device and display for detecting TV and film signals |
| CN101610348A (en) * | 2008-06-16 | 2009-12-23 | 宝利微电子系统控股公司 | Detect the method and the device of multiple film mode |
| CN101483790B (en) * | 2008-12-22 | 2011-01-12 | 四川虹微技术有限公司 | Movie mode video signal detection method |
| CN101483745B (en) * | 2008-12-22 | 2011-11-23 | 四川虹微技术有限公司 | Video mode recognition method based on edge detection |
| CN102104764A (en) * | 2009-12-17 | 2011-06-22 | 于培宁 | Method for compressing, storing and processing image sequence |
| WO2011072620A1 (en) * | 2009-12-17 | 2011-06-23 | 珂溢鸿科技发展（北京）有限公司 | Method for storing and processing image sequence and method for compressing, storing and processing image sequence |
| US8644626B2 (en) | 2009-12-17 | 2014-02-04 | Intellesys Co., Ltd. | Method for storing and processing image sequence and method for compressing, storing and processing image sequence |
| CN102104764B (en) * | 2009-12-17 | 2015-01-21 | 于培宁 | Method for compressing, storing and processing image sequence |
| CN103297740A (en) * | 2013-05-29 | 2013-09-11 | 四川长虹电器股份有限公司 | Method for eliminating pausing of display |
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