CN1291588C - Scanning mode converting method for TV-set - Google Patents
Scanning mode converting method for TV-set Download PDFInfo
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- CN1291588C CN1291588C CN 03150429 CN03150429A CN1291588C CN 1291588 C CN1291588 C CN 1291588C CN 03150429 CN03150429 CN 03150429 CN 03150429 A CN03150429 A CN 03150429A CN 1291588 C CN1291588 C CN 1291588C
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Abstract
The present invention relates to a scanning mode converting method for a television. The present invention comprises that: a 24 fps video code flow is converted to a 30 fps scanning mode by a pull proportion of three to two; time difference in the same position of adjacent frames among the frames is detected, and a time difference rule is found; whether a code flow source is a film or an interlaced video; proper field reconstruction is carried out according to the types of the judged code flow source; frames with reconstructed files are displayed in a scanning mode of a corresponding source. The present invention judges whether a video code flow source is a film or an interlaced video so as to carry out anti-staggering treatment. Therefore, when displaying with a video flow of a film source on a display device in a progressive scanning mode, the present invention can prevent the problem of low image quality.
Description
(1) technical field
The invention relates to the scan mode conversion method of television set, refer in particular to the form that detects the interlacing scan form, detect the result, be converted to the scan mode conversion method of a kind of television set of progressive scan mode according to it.
(2) background technology
Generally, the scan mode of television set has interlacing scan (INTERLACED) mode and (PROGRESSIVE) mode of lining by line scan.
The progressive scan mode that computer monitor or digital television use is simultaneously all horizontal scanning lines to be shown as 1 frame.The NTSC of standard TV form, PAL, what the Sequential Color and Memory system formula was used is interlacing scan, once half of a horizontal scan scan line.
That is, interlacing scan is after first scanning field of odd-numbered line shows, shows second scanning field of the horizontal scanning line of even number line again.What utilize is the persistence of vision (look and the stay) phenomenon of human eye feature.
Interleaved characteristics like this are to use the data of half can reach high refresh rate (refreshrate:50 or 60Hz).
But,, need can't avoid resolution to be reduced to the problem of half by filtering in order to solve problem such as film flicker.
Above-mentioned interlacing scan and the difference of lining by line scan depend on the shooting process of its image source.That is, film camera is that per second is taken 24 frames, and video camera is with 1/60 second interval, the scanning field of reverse shot odd and even number field.
Therefore, in order to be shown as film, need to use the per second film-mode of 24 frames of lining by line scan.
A lot of film imprintings are arranged now in the listing of DVD dish.Present DVD specification is an interlace mode, supposes that the mode that per second scans 30 frames formulates.
But according to the difference of above-mentioned shooting mode, the situation of film is the data source of progressive scan mode, and per second scans the mode of 24 frames.For this reason, with the film imprinting on the DVD dish, need change frame frequency (framerate) during coding.
In the coding of prior art, the method for conversion frame frequency is, when writing down 24 frames, utilizes the field, the end of mpeg stream standard and second, scans the method that 30 frames show with per second during broadcast.
Also have another kind of method to be, 24 frames are pulled down to 30 frames use.Describe these with reference to the accompanying drawings in detail
The method of prior art.
Fig. 1 a and Fig. 1 c after being used for the data flow decoding of prior art 24 frame code streams and its 24 frame separately, scan with per second on the interlace mode display unit of 60 frames.Or scan on the progressive scan mode display unit of 60 frames with per second at above-mentioned 24 frames stream, show the decoded result of coupling.
At first (I1 will push up preferential (a Top_field first) and use 1,1,0,0,0,1,0, repeats first (Repeat_first_field) and use 1,0,0,1,1,1,0 the 24 frame code streams of Fig. 1 a on the P2, B3 ~ B7).
Above-mentioned I1, P2, each transmission sequence (TRANSMISSION ORDER) naturally of B3 ~ B7, hold separately setting the frame unit gap (FRAME UNITINTERVAL, FU).This is for isochronous audio signal and vision signal, can be synchronous by the reasonable combination and the audio signal of order of transmission, and each frame unit gap of its order of transmission is according to some difference of each standard.
Be applicable to that the field, top of above-mentioned code stream is preferential and repeat first and define according to mpeg standard.Therefore on the display unit of the display unit of the interlace mode of 60 of per second scannings and per second 60 frames or progressive scan mode, be converted to appropriate signal.
Fig. 1 b is with above-mentioned 24 frame code streams, can be used in to decode on the display unit of interlace mode of 60 of per second scannings.Can (frame of B3 ~ B7) be divided into top (top field) and back court (bottom field) (is respectively in the diagram: top for I1, P2 with above-mentioned 24 frame code streams, bot), example: I1top, I1bot, P2top, P2bot ... Deng, with the interlace mode demonstration of per second 30 frames.
Under such state, be added to per second 24 frames, in the actual play process, per second 30 frames can be shown with interlace mode scanning though draw.
Fig. 1 c is, for the code stream with above-mentioned 24 frames is used in that per second scans on the display unit of lining by line scan of 60 frames and decoded results.Can change order of transmission as shown in the figure, solution is synchronous with audio signal.
Aforesaid way is to hold sign from the progressive scan mode data source of 24 frames according to each frame of MPEG standard, could be shown as the progressive scan mode that per second scans 60 frames easily.
Fig. 2 a and 2c are another enforcement illustrations of prior art.As shown in the figure, shooting is to be above-mentioned film-mode, draws to add per second 24 frames (F1 ~ F4) is divided into top and field, the end to each frame, and data flow is converted to the data flow of the progressive scan mode of per second 30 frames.
Shown in Fig. 2 c, press order of transmission (I1, P2, B3 ~ B7) encode example: F1top, F1bot, F1top, F1bot, F2bot, F2top, F3bot ... Deng, the field, top preferentially is set at 1, repeats first and is set at 0.
Such code stream on 60 interleaved display unit of per second, shows that in order the scanning field of each frame just can.
At the code stream that utilizes above-mentioned Fig. 2 c, per second scans in the mode of 60 frames, does not have the time difference information of each scanning field in the above-mentioned code stream in each frame.Therefore and the code stream of common per second interlacing scan 30 frames do not have difference.
Such code stream is with under the progressive scan mode scan condition, is the film data when can not differentiating original shooting, plays by common reciprocal cross fault reason, causes picture quality bad.
As mentioned above, the conversion method of existing television scanning mode, can't judge that the code stream source is cinefilm source or ordinary video source, no matter the kind of its data source, show with interlace mode or progressive scan mode, when using the film code stream source of progressive scan mode, be shown as in the process of progressive scan mode, there is the bad problem of picture quality.
(3) summary of the invention
The objective of the invention is to solve the problem that above-mentioned prior art exists, design a kind of when showing the film source of progressive scan mode, can judge the kind of code stream, the decoding that meets provides the scan mode conversion method of the television set that prevents that picture quality is low.
The object of the present invention is achieved like this:
A kind of scan mode conversion method of television set, it comprises:
A kind of scan mode conversion method of television set, it comprises:
Step 5 is carried out the field reorganization according to the data flow kind of above-mentioned judgement, with suitable scan mode scanning.
Effect of the present invention:
As mentioned above, the present invention obtains the time difference between the field that is included in the same position that respectively faces frame in the video code flow mutually, detect the cycle variation law of its time difference, judge that its code stream source is film or interlaced video, the reciprocal cross fault reason of mating, the bad problem of image quality in the time of can preventing to show the film video flowing on the progressive scan mode display unit.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 a-Fig. 1 c: original 24 frame code streams, be converted to the procedure schema figure of the form that is fit to interlace mode or progressive scan mode in the prior art;
Fig. 2 a-Fig. 2 c: another enforcement illustration of scan mode conversion method in the prior art;
Fig. 3 a-Fig. 3 c: the ideograph that adopts reciprocal cross fault reason (DE-INTERLACING) method of the interlacing scan source and course that is applicable to film of the present invention;
Fig. 4: the regular pattern figure of film source code stream;
Fig. 5: the concept map of reciprocal cross fault reason;
Fig. 6: the present invention detects the procedural order figure in code stream source;
Fig. 7: the ideograph that is applicable to field, film of the present invention source regrouping process is described;
Fig. 8: film source and interlaced source, constantly draw the processing procedure ideograph of the present invention when being added to video flowing.
(5) embodiment
Below with reference to accompanying drawing of the present invention, embodiments of the present invention are elaborated.
Fig. 3 a and Fig. 3 c are the ideographs that reciprocal cross fault reason (DE-INTERLACING) method of the present invention of the interlacing scan source and course that is applicable to film is described.
As shown in the figure, (Fig. 3 a) isolates each frame, and (field, top top field and field, the end bottom field (being respectively the diagram: TOP and BOT) of F1 ~ F4) are converted to the data flow (Fig. 3 b) of per second 30 frames from 24 frame code streams, example: F1top, F1bot, F1top, F1bot, F2bot, F2top, F3bot ... Deng, in isolated, find out original frame field, reconfigure the scanning field (code stream among Fig. 3 c: I1, B3, the B4 that convert per second 60 frames to, P2, B6 etc.).
Each frame is divided under the state of top (top field) He Dichang (bottom field) in said process, needs its state of cutting apart to judge that the code stream source of deriving is the film source or the process of video source.According to its judged result, with above-mentioned first (top field) and back court (bottom field) the field tram of recombinating, it is crucial obtaining corresponding scan mode data flow.
Fig. 4 is when above-mentioned code stream is film, just to detect the ideograph of film-mode method.As shown in the figure, draw the code stream that adds per second 24 frames, drop-down 3:2 forms under the state of 30 frames, and same difference of adjacent frames has certain rules.
That is, the time difference of the field, top (top field) of initial frame F0 and the field, top (top field) of next frame F1 is little, and the difference of the field, the end between its frame (bottom field) is very big.The difference of the field, top of above-mentioned frame F1 and next frame F2 (top field) is all very big, and the result by such process all compares holds specific pattern.
That is, be relatively little value of its time difference S, when the time difference, big relatively value was L, occur repeatedly ' SLLLL '.
Such pattern has certain rules when being film-mode.When judging that code stream is film, utilize this regularity in the present invention.
The notion of this regular reciprocal cross fault reason is judged in explanation earlier.
Fig. 5 is the concept map that basic reciprocal cross fault is managed.As shown in the figure, because of the time difference between the scanning field that is included in frame (D_FRAME), can not be merely when generating a frame reorganization now and next.
At this moment utilize and dynamically calculate or preferentially detect, finish a reorganization.
The frame of the reciprocal cross fault reason before CUR_FIELD utilizes, later scanning field or when the data of front court, next of prediction is restored between the barnyard (D_FRAME and CUR_FIELD) and was separated by 1/60 second.
But, under the situation in film source, find out the original scanning field that is positioned at its scanning field, carry out the field reorganization, can demonstrate more outstanding characteristic better.
Fig. 6 utilizes to be positioned at above-mentioned adjacent frames and to detect the film-mode (precedence diagram in code stream source in the time difference of the field of same position.
As shown in the figure, the present invention detects the flow process in code stream source and is;
Beginning;
S1: at first minimum value (Min) and maximum (Max) are arranged to same value, the minimum value (Pseudo_Min) of former state is arranged to maximum (Max);
Film_en=0 (interlacing scan)
Calculated value (cnt, m_cntCNT) all be set to 0, cnt is the calculated value that is positioned at the big difference (L) of same value of above-mentioned adjacent frames in the aforementioned calculation value, m_cntCNT is the pattern repeatedly of little value (S) and big value (L) in the aforementioned calculation value, promptly calculate the intrinsic S in film source, L, L, L, the calculated value of the number of occurrence of L pattern.
S2: calculate then between the field that is positioned at above-mentioned adjacent frames same position poor (calc_diff).
S3: the mean value (calc_diff_averaqe) that calculates poor (calc_diff) between appearing on the scene.
S4: next, judge that above-mentioned mean value (diff_averaqe is diff_avg) takes advantage of the value of set point (T1) whether little than above-mentioned difference (diff), that is, whether judge diff greater than T1 * diff_avg, promptly judge whether Film_en==1 (film-mode)?
S5: if flow process S4 judges is greater than diff＞T1 * diff_avg, that is, when difference (diff) was very big, above-mentioned code stream source was judged as interlaced video (Min=diff), comes back to flow process S1.
S6: if flow process S4 judges is not greater than diff＞T1 * diff_avg, that is, when difference (diff) is not very big between above-mentioned, the field value difference of first frame and second frame, judge promptly whether difference (diff) is littler than minimum value (Min) between above-mentioned, that is, above-mentioned minimum value (Min) is set the difference (Diff) of initial set value, is little situation if judge, during diff＜Min, get back to flow process S5, come back to flow process S1 and calculate second frame and the 3rd frame difference, obtain mean value.
S7: if the field value difference of each interframe same position of obtaining among the flow process S6, relatively be judged as when big by size with minimum value, that is, when not being diff＜Min, promptly the field value difference between first frame and the next frame is a benchmark, when all the other value differences (Diff) are big, calculate its value, that is, and cnt++, (diff＜Pseudo_Min), Pseudo_Min=diff.
S8: so repeatedly process, when if first (top field) difference of first frame and second frame is bigger than all the other differences (Diff), do you judge difference cnt==4? if judge less than 4, above-mentioned code stream source will be judged as interlaced video, get back to flow process S2, littler in 4 results that compare again than in the past, when promptly judged result is above-mentioned SLLLL pattern, aforementioned calculation value (M_cnt) is increased by one.
That is, above-mentioned each frame detects from film, and the field of first frame and second frame is worth can be little, next up to the field of the 5th frame value comparative result meeting big (L), and at this moment can be with the SLLLL pattern.
In order to judge such regularity, the field value difference of next frame and the comparative result of minimum value (Min), if when difference (Diff) is bigger than minimum value (MIin), increase aforementioned calculation value (cnt).
At this moment, above-mentioned difference (Diff) is than minimum value (Min) hour, because the double continuous appearance of little value, can judge above-mentioned frame is not film-mode, gets back to flow process S2.
S9: next judging aforementioned calculation value (Cnt) among the flow process S8, is to calculate difference (calc_diff) at 4 o'clock.
S10: the size of judging minimum value (Pseudo_Min) in its difference (Diff) and the former big value (L), if be minimum value difference when minimum value (Pseudo_Min) is bigger in the big value (L) in the past under the state, if judge it is not diff＜during Pseudo_Min, get back to flow process 5.
S11: (min=diff cnt=0), judges its number of occurrence to calculated value (Cnt), increases the number of occurrence, judges calculated value (m_cnt) with 0 initialization.
Judge the same scanning field value difference little (S) that faces mutually between the frame by such process, the SLLLL whether big value (L) meets film-mode is rule repeatedly, and the calculating number of occurrence, and wherein the number of occurrence is set at T2.
S12: judge that whether the number of occurrence (m_cnt) is T2, if m_cnt is not T2, gets back to flow process S2.
S13: if among the flow process S12, when the number of occurrence of its SLLLL is the number of times of setting (T2), load film-mode, in decode procedure, can decode with film-mode, (Film_en=1, f_cnt=0).
Said sequence figure is for the frame of judging whether film detects, and detects the distinctive rule of film frame, can its decoding process of easier decision when decoding with this.
The method for detecting of the above-mentioned film-mode of simplified summary is in initial init state, detects the field value of each frame, obtain the difference of its value after, the minimum value in maximum (L) in the difference of its difference and former state is compared, judge its size.
When present difference hour, be appointed as S, be appointed as L when big, judge that rule that whether its value hold SLLLL and its SLLLL are repeatedly several times.If when the result is above above the number of setting, above-mentioned frame is judged to be film-mode.
After detecting, reconstitute each frame (data of F0 ~ F4) again to film-mode.
This is for the field data of 60 of per second scannings, is converted to the frame data that per second shows 60 frames.As shown in Figure 7, when constituting initial frame (F0), present value of state and with front court value or next value before utilizing, each frame of reorganization (scanning field of F0 ~ F4).Among the figure, _
The number of occurrence (m_cnt) 01234012
field0 f0t f0b f1t f1b f2t f2b f3t f3b
field1 f1t f1b f2t f2b f3t f3b f4t f4b
Difference S L L L L S L L
diff(field0-field1)
First reorganization f1t f1b f2t f2b f3t f3b f4t f4b
(1st?weaving?field)
Second reorganization f0b f2t f1b f3t f3b f3t f4b f4t
(2nt?weaving?field)
F0 among above-mentioned Fig. 7 refers to scanning field to F4, and (t and the b of F0 ~ F4) put down in writing later represent first (top field) and back court (bottom field) respectively to its scanning field.
What utilize is present field value and later scanning field though its regrouping process is most of, and shown in Figure 7 what partly utilize as circle is with front court configuration frame data.
By such process the film frame that per second scans 24 frames is converted to the frame that per second scans the progressive scan mode of 60 frames, holds certain rules in its code stream, detect AD HOC repeatedly, detecting is 24 frame films, and the decoding of mating.
In addition, show and to draw the code stream kind that adds in the above-mentioned film-mode process and processing procedure that interlaced video data draws the situation of adding jointly has explanation at Fig. 8 detecting.
As shown in Figure 8, true form be film frame (F0, F1), true form is that scanning field, the true form of film frame is the frame (F2) that mixes of field of interlaced video (inter laced video), true form is that (F3 F4) may continue to draw to add for the frame of interlaced video.
This is drop-down 3:2 coding of film and interlaced video coding editor in its video flowing.When film-mode was kept in this boundary line, the interlaced field that the time difference between each is big can produce picture update (COMBING) phenomenon when becoming a frame.
In order to prevent these problems, when each difference (Diff) becomes big suddenly, judge that above-mentioned code stream true form is not a film, change its recombination method (WEAVE).
Promptly, the top field difference of first frame (F0) and second frame (F1) is little, the difference of the bottom field of first frame (F0) and second frame (F1) is big (L), the topfield of second frame (F1) and the 3rd frame (F2) difference is for the top field difference of its second frame (F1) and the 3rd frame (F2) under the state of big value (L) during for (Big-L) especially greatly, as above-mentioned shown in Figure 6, the top field difference of above-mentioned second frame (F1) and the 3rd frame (F2) is bigger than the average product mutually of set point (T1) and each difference, therefore is judged to be king-sized value (Big-L).
These value differences are the fields along with editor's variation of scene, the time difference of its scene is big, particularly according to its of scan mode in time interval become bigger, the result who detects these time differences is when being worth greatly, because when above-mentioned film-mode carries out field reorganization (WEAVE) simultaneously, infiltrate big scanning field of time difference in the same frame and its characterization deterioration, so when detecting very big value (Big L), interrupt film-mode, carry out field reorganization (WEAVE) with interlace mode.
At this moment, above-mentioned frame (F2) is carried out the field reorganization (WEAVE) of film-mode, this can cause the data degradation of a field.
But people's eyes can not be seen this data degradation, and the deterioration of image can not be found, and therefore can not be used as problem.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (4)
1, a kind of scan mode conversion method of television set, its feature comprises:
Step 1, field, top and field, the end that 24 frame video code flows are isolated each frame, drop-down 3: 2 of every frame is converted to the frame that per second scans 30 frame modes;
Step 2, detect the time difference of the same position field of consecutive frame in the above-mentioned frame, and judge the rule of its time difference, the kind of judging its video code flow source is film or interlaced video, promptly, the time difference of the field, top of initial frame F0 and the field, top of next frame F1 is relative less, this value is made as S, the difference of the field, top of initial frame F0 and the field, the end of next frame F1 is relative very big, this value is made as L, the difference of the field, top of above-mentioned frame F1 and next frame F2 is relative very big, and this value is for L, the result who all compares by such process, time difference is held the pattern ' SLLLL ' of certain rule, this pattern occurs repeatedly, and the video code flow source of holding the time difference pattern of such rule is a film-mode, is interlaced video mode if do not hold the video code flow source of the time difference pattern of such rule;
Step 3 according to the kind in the video code flow source of above-mentioned judgement, is carried out suitable field reorganization;
Step 4 is shown as the scan mode that meets its data source to the frame of above-mentioned reorganization.
2, a kind of scan mode conversion method of television set, its feature comprises:
Step 1 is obtained the field, top and field, the end time difference separately of consecutive frame;
Step 2 compares above-mentioned time difference and its fiducial value, judges that its difference is littler or big than fiducial value;
Step 3, calculate above-mentioned time difference than fiducial value the little and big number of times that takes place, clocklike whether the arrangement of the number of times that the judgement time difference is bigger than fiducial value than little number of times of fiducial value and time difference the number of times that recurs of pattern and this regular pattern thereof;
Step 4, if the field, top of described consecutive frame and field, end time difference and described fiducial value separately relatively is that little value is S, is that big value is L, if the regular pattern that little number of times and big number of times take place the video code flow source is judged as film-mode for " SLLLL " and this mode continuous occur in set point number when above, when recurring or " SLLLL " do not take place, the video code flow source is judged as interlaced video;
Step 5 is carried out the field reorganization according to the data flow kind of above-mentioned judgement, with suitable scan mode scanning.
3, the scan mode conversion method of television set as claimed in claim 1 or 2, when it is characterized in that the judgement of described video code flow source is film, carry out a step of reorganization and find out the position of each at film-mode, with its frame that constitutes, the scanning field of this frame is the scanning field of present frame and before this or the combination of scanning field after this.
4, the scan mode conversion method of television set as claimed in claim 2, the time difference that it is characterized in that described same position field value of facing frame mutually is judged as interlaced video to its video code flow source during greater than the setting-up time difference.
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| CN 03150429 CN1291588C (en) | 2003-08-20 | 2003-08-20 | Scanning mode converting method for TV-set |
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| CN100352261C (en) * | 2005-06-09 | 2007-11-28 | 西安交通大学 | Detection method of 3:2 pull-down film source video |
| JP4655218B2 (en) * | 2005-09-16 | 2011-03-23 | ソニー株式会社 | Signal processing apparatus and method, program, and recording medium |
| CN105208313B (en) * | 2015-09-25 | 2018-05-04 | 上海兆芯集成电路有限公司 | Display device and video signal processing method |
| CN108134938B (en) * | 2016-12-01 | 2021-08-06 | 中兴通讯股份有限公司 | Video scanning mode detection and correction method, video playing method and device |
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