TW201116057A - Method of determining film mode - Google Patents

Abstract

The present invention is directed to a method of determining film mode. Firstly, it is determined whether current mode is the film mode. If the determination is positive, the pixels of the current picture are analyzed to decide whether the number of abnormal pixels exceeds threshold(s). If the decision is positive, the current mode may be out of the film mode.

Description

201116057. VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to de-interlace, and more particularly to a film mode detection suitable for deinterlacing. [Prior Art] [0002] [0003] The National Television System Committee (NTSC) broadcast video format has an image frequency of 60 fields per second (ie, 60 fields/sec), but is filmed in film. The image frequency of the movie is 24 frames per second (ie, 24 frames/sec). In order to allow the movie to be played on an NTSC-formatted TV set, it is generally converted in 3:2 (you: Royal H mode, the first of the two adjacent frames of the movie and the second frame is converted into 2 markets; In other words, the adjacent frames are converted to 5 fields. According to this principle, 24 frames per second are converted to 60 fields per second, thus conforming to the NTSC format.

Infellecfua! Phased reverse (Phase Alterifi+ng (4), PAL) broadcast video format with a round image frequency of fields/sec) «In order to allow movies to be played on a pAL format TV, a 2:2 conversion can be used ( The 2:2 pull down) method converts 24 frames per second to 48 fields per second, however this will result in an acceleration of about 4%. Here, you can use another improved 2:2 conversion, called 2:2:2:2:2:2:2:2:2:2: 2:3 conversion, which can take 24 seconds per second for movies. The frame is converted to 5 fields per second, thus conforming to the pAL format. NTSC or PAL format transmissions are interlaced image fields 'To display them in non-interlaced 098135314 Form No. A0101 Page 3 / Total 17 Page 0992060555-0 [0004] 201116057 Or on a pr〇gressive display, the field must first be restored to a frame 'this is called de-interlace. In the case of deinterlacing, spatial interleaving or temp〇ral interpolation is used to generate or fill the missing scan lines. Wherein spatial interpolation uses only pixels of the same field to generate new pixels, and is therefore also referred to as intra-field or two-dimensional interpolation; temporal interpolation uses pixels of adjacent different fields. To generate new pixels' is therefore also called inter-field or three-dimensional interpolation. Typically, the quiescent zones are deinterlaced by temporal interpolation, while the mobile zones are interleaved by spatial interpolation. The quiescent zone and the moving zone must be deinterlaced by means of interpolation (Boti 〇 ) ) | | | , , , , 以 以 — — — — — — — — — — — — — ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( n adaptive de-interlace), used in the film mode de-: interlace method. [0005] [0006] 〇 But 疋’ for the film mode (filby and singular) signals are interlaced, then

Take 2, .u * ^ I is to copy the previous scene or the next lap.

'This is the same as the deinterlacing of the interlaced signals.' If the interleaving method, the \Jt*rice film mode signal is deinterlaced; the enamel surface is blurred or beaten. Due to the reception of the TV signal, the interlaced signal or video mode signal may be interspersed. Therefore, the receiver must be able to discriminate whether the type of the received signal belongs to the general interlaced signal or the video mode signal. However, the conventional receiver cannot When the film mode is changed to the interlaced mode, the film mode is discriminated and jumped out in time', which is jagged and causes the picture to break. Therefore, it is urgent to propose a novel judgment mechanism to timely transform the film mode into a general interlaced mode to avoid cracking of the picture. 098135314 Form No. A0101 Page/Total 17 Page 0982060555-0 [0007] 201116057 [Summary] [] Jian; ^ The above, the purpose of the rabbit example of the present invention is to propose a film mode bribe method 'which can be detected Whether the signal has changed from the shadow > 5 mode to the general deinterlacing mode is used to change the deinterlacing method in time to improve the image quality. [0009]

According to an embodiment of the present invention, in the first year, it is decided whether or not it is currently in the mode of the mouse. If in movie mode, the pixels of the current picture are analyzed to determine if the number of abnormal pixels exceeds a critical value. Wherein, if the number of abnormal pixels exceeds a critical value, it means that the movie mode has been left, and the motion adaptive de_interlace has been moved. In the embodiment, the color boundary of the scent boundary includes a screen abnormal value and the number of abnormal pixels of the scanning line abnormality criticality exceeds the constant value*, then the 'moving flag is changed to make the state become a line; When the number of abnormal pixels of the miscellaneous line exceeds the critical value of the scanning line, the 'visual-scanning line abnormal flag' is such that when «_active β its towel' is active, the whole picture (four) is deinterlaced; when the scanning line The abnormal flag becomes the main ", and the instrument line is changed to perform mobile adaptation and deinterlacing; when the picture abnormal flag and the scan line abnormal flag are both inactive", the film mode is deinterleaved. [Embodiment] [0010] The flowchart of the first figure shows a film mode determination or refinement method according to an embodiment of the present invention for detecting whether a signal has been changed from a film mode to a general deinterlace mode ( De-interlace mode), thus timely changing the film mode to 098135314 Form nickname A0101 Page 5 of 17 page 0982060555-0 201116057 Change the method to the motion adaptive lnterlace method to avoid the jaggedness of the face Or broken Splitting phenomenon [0011]: In the flow shown in the '' diagram', first, step 11 determines whether it is currently in the film mode. If the result of step 11 is no, then proceeds to step 12, using the motion adaptation deinterlacing technique for deinterleaving. In general, the rest area you and the section are interpolated in time to interleave, and the moving area is spatially interpolated for deinterlacing. If the result of step 11 is yes, then in step 13 Analyze and count the pixel data of the current picture. Once the statistics know that the abnormality or the splitting phenomenon, Weng Lu abandoned the secret turtle super-delivery threshold value, then the table = may have left the film mode, proceed to step 12 to move the adaptive deinterlacing technology. The deferred fee *13 does not find that the abnormal pixel or its number does not exceed the critical value, it means that it is still in the movie chess style, so it goes to step 14 to deinterlace in the film mode deinterlacing technique. Generally speaking, in ^ In the shadow mode, f is restored to the reference frame by copying the entire field of the previous field or the back field.

[0012] In this embodiment, the analysis and statistics of step 13 are in units of scan lines.

ongoing. When the number of abnormal pixels in the entire picture has exceeded the first-threshold value (or called the screen abnormality threshold) _', the related first flag search (or called facet abnormal flag) fm_refine_en is started to make it center-shaped. Active. In addition, when the number of abnormal pixels in the current scan line has exceeded the second critical value (or called the scan line abnormal threshold), the related second flag (or called the scan line abnormal flag) is started. firefine-line one En, its state becomes active (ΜΗν(一). 098135314 Form number A0101 Page 6 of 17 page 0982060555-0 201116057 The first flag firef ine one en or the second flag ~eflne~line-en at least one is activated Then go to step 12 乂 move adaptation deinterlacing technology to perform deinterlacing; otherwise, proceed to step 4 to perform deinterleaving by film mode deinterlacing technology. In this embodiment, the flag fm_ref ine_en is activated after the whole piece The scan line white t of the picture should be changed to move and adjust to deinterlace; however, starting the second flag ine-line_en will only affect the next scan line. [0013] The first line shows the first/second flag of the first picture. Detailed flowchart of the target.

First, step 21 determines if it is currently in movie mode. If the result of step 21 is no, the general deinterlacing mode is entered; if the result is YES, whether the zigzag or the abnormal image is generated in the order of the scanning line is in accordance with the odd or even The difference in the market, thus copying all the scan lines of the previous field or the next [0014] field. In this case, step (4) will determine the abnormal pixel based on whether it copies the front-field scan line, respectively, and step 3B. The third Erde, the pc, the call, the current screen (the line ^|0¥ screen (scanning fine, NC, NE) part of the scan line and its pixels. In step 23A 'check the current screen and the front - Whether there is a difference in the corresponding position of the picture or whether there is a difference in (4). In step 23β, it is checked whether there is a difference or a difference in the corresponding position between the current picture and the lower picture. In this embodiment, the current picture is indicated by the variable F14. Whether there is a difference from the corresponding position of the previous picture, and the variable indicates whether there is a difference between the current picture and the corresponding position of the next picture: Fl = 2* 丨B-PC | > 丨BD | & 2" D-PC | > | BD | 098135314 Form Number A0101 0982060555-0 201116057 F2=2* I B-NC I > I BD | & 2* | D-NC | > | BD | [0015] [0016] In addition, the variable F11 indicates whether the corresponding position of the current picture and the previous picture has a considerable (or large difference), and the variable F22 indicates whether the corresponding position of the current picture and the next picture has a considerable (or large )difference:

Fll=2* | B-PC | >( | BD | +T) & 2* | D-PC | >( | BD | +T) F22=2* | B-NC 丨>(丨BD | +T) & 2* 丨D-NC | >( | B-

D | +T) where T is a preset constant. In addition, in this embodiment, whether the opposite position of the front surface and the previous picture is used, and whether the corresponding position of the current picture and the next picture is used by the two-dimensional deinterlacing is better. The effect can be determined using the following formula:

Cl=2D_diff< :|』left &__娜丨.&2D_diff<Tspatial-diff》『p : C2=2D_diff< | B-NC | & "age branch,!· I D-NC 丨& 2D_di ff<Tspatial_di ff where Tspatial_diff is a preset constant ' 2D_diff represents the difference between the pixels in the selected direction on the upper and lower scan lines in the interpolation direction determined by the two-dimensional deinterlacing. In the present embodiment, 'Step 23A' is used to determine whether it will produce a mineral tooth or whether it is an abnormal pixel: ((F1 = = 1 & F 2 = = 0 ) or (F11 = = 1 & F 2 2 = = 1)) and C1 098135314 Form No. A0101 Page 8 / Total 17 Page 0992060555-0 201116057 [_ Step 2_ The following formula to determine whether it will produce orthodontic or abnormal pixels: (Fl== 〇& F2 = = l) or (Fll = = l & j?22 = = i)) and C2 just * step through step 3 or step 23B determines that the pixel will produce a mineral tooth or an abnormal pixel, The second count value (or referred to as scan line abnormal pixel count value) fm_refine_line-count plus one (step 24), and the first count value (or called picture abnormal pixel count value) fm_refine_count is incremented by one (step 25) ).

[0020] The above steps 21-25 are repeated until the equal-line scan line processing ends (step 26). Next, in the step, the count value fm_ref ine-1 ine_count __1 ine_th e pass #二__ every _ is a fixed value, which is only related to the screen width·. If the result of step 27_ is YES, the relevant second flag (scan line abnormal flag) is started. For, 1" On the other hand, when the entire scan line e-Une-(10), the _ face (10) - )or

When Pron^rfv ***» fensa- -η#*» £ ? Tr step 26), in addition to resetting the scan line abnormal pixel count value fm_refine_line_count (step 28), the screen abnormal pixel is also determined in step (9). Whether the count value returns to refine_c_t exceeds the (th) threshold fm-refine_th. Usually, the first threshold value is a variation value, which varies depending on the position of the scanning line, and the lower the sweep line, the larger the first critical value. If the result of the determination of (4) 29 is YES, the corresponding flag of the phase (the picture abnormal flag ~efine_en ' is started to make its state become active or „. 098135314 Form No. 0982060555-0 201116057 [0022] In the above embodiment, by judging the jagged abnormal pixel point, it can be detected whether the signal has changed from the film mode to the general deinterlacing mode, and thus the deinterlacing method is changed in time to avoid the jagged and broken phenomenon of the picture. The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not included in the spirit of the invention should be included. [0024] The flow chart of the first figure shows the film mode determination method of the embodiment of the present invention. The second figure shows the details of starting the first and second flags of the first figure. The third diagram shows the previous screen, the current screen, and the partial scan lines of the next screen and their pixels. [Main component symbol description] [0025] 11-14 Bu step 2 step 29 PA / PC / PE pixels front side of a day B / D picture of the current pixel NA / NC / NE of the next screen 0982060555-0 Form Number A0101 098 135 314 Page 10/17 Total

Claims (1)

201116057 VII. Patent application scope: 1. A film mode judgment method, comprising: determining whether the film mode is currently in use; and if in the film mode, analyzing the pixels of the current picture to determine whether the number of abnormal pixels exceeds the critical value. Value; wherein, if the number of abnormal pixels exceeds the critical value, it indicates that the movie mode has been left. 2. The film mode judging method according to claim 1 of the patent application, if the film mode is in the film mode or has left the film mode, then the motion adaptive de-interlace is performed; otherwise, the film mode is performed. The film mode de-interlace method is as described in claim 2, wherein in the moving adjustment deinterlacing step, the still region is deinterleaved by temporal interpolation. The moving area is deinterlaced by spatial interpolation to restore the field to a frame. 4. The film-based ijW method described in claim 2, wherein the film mode is as described above. In the deinterlacing step, the entire field of the previous field or the next .... ήa J y 4 ^ rnm-M field is used to flatten the picture of Figure 4' into a frame. The film mode judging method according to the first aspect, wherein the analyzing step of the pixel is performed in units of scanning lines. 6. The film mode judging method according to claim 1, wherein the number of abnormal pixels whether The determining step of the over-critical value includes: when the number of abnormal pixels of the entire screen exceeds a screen abnormal threshold, the screen abnormal flag is activated to make the state become active; and the number of abnormal pixels of the current scanning line More than one scan line abnormal threshold value 098135314 Form No. A0101 Page 11 / Total 17 page 0982060555-0 201116057 'The start-scan line abnormal flag, as described in the scope of claim 6;: Active. The scanning line abnormality threshold value is a fixed 10,000-column breaking method, wherein the upper one is related to the width of the picture, as described in the patent application scope "the film mode description screen abnormal threshold value with the scanning method, wherein the scanning Line, the larger the abnormal value of the screen is, the more the value is changed. The more the flag is, the more the flag is, the more the flag is, the more the flag is. The scanned scan lines are all changed to the scan line abnormal flag material non-main flag and . : 3⁄4 D, mode deinterlace ίο 11 . 098135314 The film mode judgment method according to item 6, wherein the number of abnormal pixels is the value of the Wei ship boundary value (4) includes: checking the pixels of the current picture and: (4) whether there is a difference between the coffees; lX':)per%, 'If there is a difference in the inspection, the abnormal pixel count value will be counted and the -picture abnormal pixel count value will be counted plus one; if the entire scan line abnormal line count value exceeds the scan line abnormality critical When the value is set, the scan line abnormal flag is activated to make its state active; and if the abnormal pixel count value of the entire screen exceeds the screen abnormal threshold value, the screen abnormal flag is activated to make the state Become active. For example, the film mode judging method described in claim 10 of the patent application further includes the variable F1 indicating whether the corresponding position of the pixel of the current picture and the previous picture is different from the form number A0101, page 12/17 pages 0982060555-0 201116057 And the variable F2 indicates whether there is a difference between the pixel of the current picture and the corresponding position of the next picture: Fl=2* | B-PC 丨> | BD 丨& 2 丨D-PC 丨> 丨BD |, F2 = 2* 丨B-NC 丨> 丨BD 丨& 2 wood | D-NC 丨> 丨BD 丨, 12 13 Where, if the picture is from scan to line A, B, C, β, E in order from top to bottom, PC represents the scan line c of the previous picture; Β, D respectively represent the scan lines B, D of the current picture; NC The scanning line representing the next picture, such as the film mode judging method described in claim 11, further includes whether the pixel of the current picture has a large difference from the corresponding position of the previous picture by the variable F11, which is larger than the variable. The difference is; the variable F22 indicates that the pixel of the current picture corresponds to the position of the next picture: it is a guard. There is a big difference, which is greater than the difference of the variable F2: :\ Fll=2* I B-PC I >( I BD I +Τ) & 2*1 Β-PC 丨>(I bd I +t) , - F22=2* I B-NC |>( | BD | +T) & 2* | D- NC | >( | BD I +ni Intellecfua! where τ is a preset constant Properly, as in the application-type judging method of the i2 item of the patent application, and further includes the variable C1 to represent the correspondence between the current picture and the previous picture. Whether the position uses two-dimensional deinterlacing will have a better effect, and the variable C2 indicates whether the corresponding position of the current picture and the next picture uses two-dimensional Wrong will have a better effect: Cl=2D_diff< | B-PC | &2D_diff< | D-PC | &2D_diff<Tspatial_diff,C2=2D_diff< I B-NC | &2D_diff< | D-NC | &2D_diff<Tspatial_diff ♦ where Tspatial_diff is a preset constant, 2D_diff stands for 2D 098135314 Form ft A0101 Page 13 of 17 0982060555-0 201116057 Deinterlacing determines the interpolation direction, upper and lower scan lines The difference between the pixels in the selected direction. 14. The method for judging the film mode as described in claim 13 is to determine if the current pixel is an abnormal pixel if the target is copied. : ~ 15 ((Fl= = l & F2 = = 0) or (Fll= = l & F22=q)) and C1. As in the film mode judgment method described in item 13 of the patent application, if the current system Copy the scan line of the next-screen, and the following formula determines that the target ^ is an abnormal pixel: ((F1= = 0 & F2 = = l) or (Fll==l & 卩, 22=^1)) and 〇2 098135314 Form bat* A0101 Page 14 of 17 0982060555-0