WO2003084227A1 - Field interpolation mehtod determination device - Google Patents
Field interpolation mehtod determination device Download PDFInfo
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- WO2003084227A1 WO2003084227A1 PCT/JP2003/003927 JP0303927W WO03084227A1 WO 2003084227 A1 WO2003084227 A1 WO 2003084227A1 JP 0303927 W JP0303927 W JP 0303927W WO 03084227 A1 WO03084227 A1 WO 03084227A1
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- correlation
- interpolation method
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0112—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards corresponding to a cinematograph film standard
- H04N7/0115—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards corresponding to a cinematograph film standard with details on the detection of a particular field or frame pattern in the incoming video signal, e.g. 3:2 pull-down pattern
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
- H04N7/012—Conversion between an interlaced and a progressive signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0135—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes
- H04N7/0147—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes the interpolation using an indication of film mode or an indication of a specific pattern, e.g. 3:2 pull-down pattern
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S348/00—Television
- Y10S348/911—Line doubler adapted for reproducing programme originally from film, e.g. 24 frames per second
Definitions
- Each field of the input interlace signal is frame-composited by either the inter-field interpolation or the intra-field interpolation, and progressively
- the present invention relates to a field interpolation method determining device that determines whether to convert a signal.
- interlaced signals to be converted to the progrip-ship signal include a standard signal captured by interlaced scanning and a signal obtained by converting the prog- leptic signal to an interlaced signal. There are and. A typical example of the latter is a telecine-converted signal.
- the telecine conversion signal is generated as follows. First, each frame of a movie film of 24 frames per second is sequentially scanned, and a progressive signal of 24 frames per second is generated. Then, each frame (parent frame) of the progressive signal is converted into an odd field of the interlace signal and an even field immediately after it. Is done.
- the first frame of the movie film (the first parent frame of the progressive signal) is converted to the first and second fields
- the second frame of the movie film is converted to the first and second fields
- the second parent frame of the progressive signal is converted to the third and fourth fields.
- the difference between the images is small. No.
- the difference in video between the fields reflects the difference between the parent frames. However, it is larger than the former. In other words, the difference between adjacent fields alternates between large and small fields according to the relationship between the parent frame and each field.
- Such a telecine-converted signal is that it is produced by a 30P video camera that generates a progressive video signal at 30 frames per second.
- the pull-down telecine conversion signal also has a regular pattern of changes in pixel level between the fields according to the relationship between the parent field and the fields.
- Japanese Patent Application Laid-Open No. 91-18784 (US 94-3666799), which has the same features as described above, discloses a field interpolation method determining apparatus. Is based on the difference between the fields of the input interlaced signal. It discloses a field trapping type determination device that determines whether or not the interlace signal is a telecine conversion signal and determines the field trapping method.
- the video signal processor 200 shown in the figure performs inter-field sampling only when the input interface signal is a telecine-converted signal, and is not a telecine-converted signal. In such a case, interpolation is performed in the field to convert the interlaced signal into a progressive signal.
- the video signal processing device 200 has an input terminal 1, a field memory 2, a field memory 4, a subtractor 6, a field interception method determining unit 108, ODD / EVEN detection section 10, first switch 12, line memory 14, 2 line interpolation section 16, second switch 18, and program Including a passive signal generator 20.
- the input terminal 1 is supplied with an input interface signal V in.
- the field memory 2 is a one-field delay input interface signal V dl that is delayed by one field from the input interlace signal V i -n. Is output.
- the one-field delay input interface signal Vd1 is input to the progressive signal generation unit 20 and inter-field interpolation is performed on the same signal. Or either in-field interpolation is performed.
- the subtractor 6 calculates the pixel level difference between the input interface signal Vin and the one-field delay input interface signal Vd1 and calculates the pixel level difference S between the fields. output as p You. Note that in the interlace signal, the scanning lines of the adjacent fields are shifted by one. For this reason, the subtractor 6 calculates the difference between the average value of the pixel levels of the adjacent two lines of one field and the corresponding pixel level of the other field. Ask. ,
- the field capturing method determining unit 108 determines whether or not the input interface signal Vin is a telecine conversion signal based on the pixel level difference Sp between the fields. Is determined.
- the field interpolation method determination unit 108 sets the inter-field interpolation and field for the one-field delay input interface signal Vd1. Field interpolating method that indicates which of the in-field interpolations is to be performed. Outputs the signal DVp.
- the second switch 18 outputs from the first switch 12 when the field interpolation method instruction signal DVp for instructing the inter-field interpolation is input.
- the selected inter-field capture video signal Sw1 is selected and output as the interpolated video signal Sw2.
- the inter-field capture signal image Sw1 is a two-field signal that is one field before the one-field delay input interface signal Vd1. This is one of the input delay signal Vd2 and the input interlace signal Vin which is a signal after one field, and is selected as follows .
- the ODD / EVEN detector 10 determines whether the signal is an odd field or an even field based on the one-field delay input interlaced signal Vd1. , And outputs a field identification signal D oe indicating the detection result.
- the first switch 12 is based on the field identification signal Doe, and has a 2-field delay input interlaced signal Vd2 or an input interface.
- the race signal Vin is selected and output as a video signal Swl between the? Specifically, the first
- the 1 switch 1 2 applies the input counter signal Vin when the 1-field delay input interface signal Vd1 is an odd field. On the other hand, if the one-field delay input interface signal Vd1 is an even field
- the progressive signal generator 20 outputs the interpolated video signal Sw 2 (in this case, selected by the first switch 12) output from the second switch 18. Interpolate the 1-field delay input interlaced signal Vd1 with the current signal Vin or 2-field delay input interface signal Vd2) and program Generate a passive signal.
- the frame of the progressive signal generated in this way is the same as the original parent frame, and is generated by the in-field interpolation described later. The vertical resolution is improved compared to the frame.
- the second switch selects the inter-field capture video signal Vd1S output from the 16-line capture unit 16 and outputs it as the interpolated video signal Sw2. I do.
- the two-line interpolation unit 16 delays the one-line delay input interlace signal Vd 1 by one line according to the line memory 14. Based on the extended one-line delay signal Vd1L and the one-field delay input interface signal Vd1, the interpolated video signal Vd1S in the field is calculated. Generate.
- the progressive signal generator 20 generates 1 by the interpolated video signal Sw 2 (in this case, the interpolated signal Vd 1 S in the field) output from the second switch 18. Generates a progressive signal by interpolating the field delay input interface signal Vd1.
- the subtractor 6 and the field interpolation method determination unit 108 in FIG. 10 correspond to a conventional field interpolation method determination device.
- a conventional field interpolation method determination device will be described with reference to FIG.
- FIG. 11 is a block diagram showing the configuration of the field interpolation method determining unit 108 shown in FIG. 10 in detail.
- the field interpolation method determination unit 108 includes an absolute value unit 81, a pixel difference judgment comparator 82, a cumulative adder 83, an inter-field correlation judgment comparator 84, a first Register 85, a second register 86, a difference judgment comparator 189 between two fields, an exclusive OR (EOR) circuit 190, a counter 92, and so on. And a count judgment comparator 93.
- EOR exclusive OR
- a timing pulse generator FP generates a field pulse VP and a frame pulse FP.
- the absolute value unit 81 has a pixel level of each pixel between the input interlace signal Vin calculated by the subtractor 6 and the one-field delay input interlace signal Vd1. A feature that is a difference The absolute value of the inter-field pixel level difference Sp is obtained, and the absolute value of the inter-field pixel level difference Sp A is output.
- the pixel difference determination comparator 82 compares the pixel level difference absolute value SpA between the fields with a predetermined first threshold value X, and compares the two fields for comparison and comparison. Judge whether the difference at the pixel level is a difference (significant difference) larger than it is recognized as being derived from the same parent frame.
- the pixel difference determination comparator 82 sets “1” as the inter-field pixel difference determination signal D p indicating this determination result when the above determination is “significant”. It outputs “0” if it is “significant”.
- the accumulator 83 outputs an inter-field pixel difference judgment accumulated value C D P which is a value obtained by accumulatively adding the inter-field pixel difference judgment signal D p.
- the pixel difference judgment cumulative value CDp between the fields is calculated by calculating the fields of the input interface signal Vin and the fields of the one-field delay input interface signal Vd1. It is a value indicating the number of pixels determined to be different between the field and.
- the accumulator 83 is reset for each field by the field noise VP.
- the inter-field correlation judgment comparator 84 determines that there is no difference between the fields. Judge that there is. Then, an inter-field correlation determination signal D f indicating the above determination result is output.
- the value of the inter-field correlation determination signal Df is “1” when there is a difference, and is “0” when there is no difference.
- the first register 85 and the second register 86 are D flip-flops, and each of them has a field pulse VP power S clock Supplied as The inter-field determination result is supplied to a series circuit of the first register 85 and the second register 86.
- the first register 85 and the second register 86 determine the difference between the stored fields, respectively, by a two-field difference judgment comparator 1889 and an EOR. Output to circuit 190.
- the EOR circuit 190 resets the power counter 92.
- the counter 92 is counted up or reset as described above.
- the count judgment comparator 93 checks the input counter trace signal for the field.
- Field interpolation method instruction signal D to instruct to perform field-to-field interpolation Print vp.
- the field interpolation method determining device cannot detect the difference between the parent frames based on the difference between the fields.
- the conventional field interpolation method determination device cannot detect the pattern of the difference between the fields, which is peculiar to the telecine conversion signal. We will judge that it is not a signal.
- the field interpolation method determination device determines that the interlace signal is not a telecine conversion signal.
- the field interpolation method determining device uses an interface. Assume that the signal is not a telecine-converted signal.
- the conventional field interpolation method determination device can detect at least a difference between at least two frames even if the input interface signal is a telecine-converted signal. Otherwise, the telecine-converted signal cannot be identified. As a result, the video signal processing device continues to operate in the field until the input interface signal is determined to be a telecine-converted signal continuously for a predetermined number of fields or more. Perform interpolation. For this reason, it is often not possible to generate an original parent frame with a high vertical resolution.
- the conventional field interpolation method determination device captures either the immediately preceding frame or the immediately following frame depending on whether the signal to be interpolated is an odd frame or an even frame. Select as signal. As a result, a signal in which the context of a field converted from a parent frame is reversed will cause two fields converted from different parent frames to be intercepted by each other. Time, it is converted to one frame. As a result, since different images are mixed in one frame, the image quality of the converted It will deteriorate significantly.
- the present invention provides a method for detecting a difference between parent frames even when it is difficult or difficult to detect the difference between the parent frames.
- the field that can accurately detect the relationship between the field and the frame, and determine which to interpolate between field interpolation and field interpolation The purpose is to provide a trapping method determining device. Disclosure of the invention
- the present invention has the following features in order to achieve the above object.
- each field of an input interlace signal is obtained by any method between the inter-field capture and the inter-field capture.
- a field interpolation method determining device that determines whether to convert to a progressive signal by frame synthesis,
- the input interlace signal and the input interlace signal are the input interlace signal and the input interlace signal.
- a pixel level difference detecting means for detecting a pixel level difference between the one field delay input signal and the one field delay input interlaced signal
- N a field correlation detection means for outputting one field correlation determination signal
- N inter-field difference storage means for storing one inter-field correlation determination signal
- N Based on the pattern of the value of the one field difference determination signal, two consecutive ones of the N consecutive fields were generated from the same frame or different fields.
- a field Z frame correlation determining means for determining whether the frame is generated from the frame
- a field interpolation method determination device comprising: an interpolation method determination unit that determines a method.
- the input interlaced signal has a greater number of contiguous numbers than the N — 1 field corresponding to the two parent frames.
- the correlation between at least N fields is detected using the field as a judgment target. Then, based on the correlation between the N fields, the relationship between the parent frame and the field is determined in multiple steps, so that the input interlacing can be performed more accurately. This has an excellent effect that the signal interpolation method can be determined.
- the field to be determined is determined. The greater the number of nodes, the better the effect that the more accurate the interlace signal capture method can be determined.
- an interpolating method determining delay unit that delays the interpolation method determination by the interpolating method determining unit by a predetermined time is further provided.
- the predetermined time is based on a time difference from when an interpolation method of the input field is determined to when an interpolation process is actually performed. It is characterized by being determined by:
- a fourth aspect is the third aspect, wherein the predetermined time is about 0.5 second, and the machine Z of the field interpolation method determination device and the device that performs the field interpolation processing is used. It is characterized by being determined based on electrical characteristics.
- a counter means for resetting the count value in the case where the count value has not been determined, and holding the count value in the case where none of the above is judged;
- the interpolation method determining means determines that the interpolation is between fields, and when the count value is less than the predetermined value, the interpolation method within the field is determined.
- the sixth aspect of the present invention is characterized in that, in the first aspect, when the input interlace signal is a 2-3 pull-down signal, N is 6 or more.
- a seventh aspect is characterized in that, in the first aspect, when the input interlaced signal is a 2-2 pull-down signal, N is 5 or more.
- the finoredo / frame correlation determining means includes at least at least one of the N-1 inter-field correlation determining signals. When two of the two fields indicate no correlation, it is characterized that it is determined that two consecutive fields are generated from different frame cards.
- the feedback frame correlation determining means does not correlate with the correlation in the N—1 field correlation determination signal.
- the feedback frame correlation determining means does not correlate with the correlation in the N—1 field correlation determination signal.
- the field correlation detection means is:
- Pixel difference determining means for determining whether the pixel signal level difference is greater than a first threshold value representing a predetermined pixel level for each pixel and outputting a binary pixel level difference determination result
- a pixel-by-pixel level difference judging means for adding the level difference judgment results in pixel units and outputting the level difference judgment results in finoledo units;
- Field unit Determines whether the correlation between the fields is large or not depending on whether the level difference judgment result is larger than the second threshold value indicating the predetermined number of pixels or not. And a means for determining inter-field correlation.
- the 1st phase is the 10th phase between the fields
- the difference determination means further includes: signal level detection means for detecting a signal level representing the brightness of an image represented by the one-field delay input interface signal;
- a first threshold value changing unit that changes a first threshold value based on the value of the signal level.
- the inter-field difference determining means further comprises a one-field delay input interface signal for displaying an image represented by the interface signal.
- Signal level detection means for detecting a signal level representing the
- the threshold value for detecting the correlation between the fields is changed according to the brightness of the video of the input interface signal. Therefore, it is possible to detect the correlation between the fields more accurately with respect to the input interface signal of the dark video where it is difficult to detect the correlation between the fields. It works.
- the difference between the fields determination means further includes the one-field delay input interface signal based on the one-field delay input interface signal. Outputs a field identification signal that indicates whether the field of the field delay input counter signal is an even field or an odd field Field identification means,
- a logical product circuit for obtaining a logical product of the field discriminating means and the inter-field correlation determination signal and outputting the result to an N-field difference storing means.
- the detection result of the correlation between the fields and the detection result of the even field Z and the odd field of the intercepted field The relationship between the parent frame and the field is determined based on the logical product of and. For this reason, a device that interpolates the field before or after the field to be interpolated based on the detection results of the even field and the odd field. In this case, the order of the even and odd fields is reversed even if an interlaced signal is input in which the order of the even and odd fields with respect to the parent frame is reversed. It has the excellent effect that it can prevent the inner miss of the front or back field which occurs in the case.
- the inter-field difference determination means further comprises an inverter for outputting an inverted signal of the field identification signal
- a field identification signal inverting switch for selectively outputting either the field identification signal or the inverted signal to the AND circuit.
- the detection result of the even field Z and the odd field and the even field z and the odd field of the trapping target field And a switch that can select an inverted signal of the detection result of the even field, the detection result of the even field, the odd field, and the even field selected by the switch.
- the relationship between the parent frame and the field is determined based on the logical product of the detection result of the correlation between the fields. For this reason, based on the detection result of the even field and the odd field, the field that includes the field before or after the field to be intercepted is based on the detection result of the even field and the odd field.
- FIG. 1 is a block diagram showing a configuration of a video signal processing device incorporating a field interpolation method determining device according to the first embodiment of the present invention.
- FIG. 2 is a diagram showing a detailed configuration of the field interpolation method determination unit shown in FIG.
- FIG. 3 is a diagram showing the relationship between the output values of the first to fourth registers shown in FIG. 2 and the input signal to the counter.
- FIG. 4 is a diagram showing the relationship between the field of the input interface signal and the frame of the converted progressive signal according to the first embodiment of the present invention. You.
- FIG. 5 is a block diagram showing a configuration of a video signal processing device incorporating the field interpolation method determining device according to the second embodiment of the present invention.
- FIG. 6 is a diagram showing a detailed configuration of the field interpolation method determination unit shown in FIG.
- FIG. 7 is a block diagram showing a configuration of a video signal processing device incorporating the field interpolation method determining device according to the third embodiment of the present invention.
- Fig. 8 shows the details of the field interpolation method determination unit shown in Fig. 7. It is a figure which shows a detailed structure.
- FIG. 9 is a block diagram showing a configuration of a video signal processing device incorporating the field interpolation method determining device according to the fourth embodiment of the present invention.
- FIG. 10 is a block diagram showing a configuration of a video signal processing device incorporating a conventional field interpolation method determination device.
- FIG. 11 is a diagram showing a detailed configuration of the field interpolation method determination unit shown in FIG.
- the conventional field interpolation method determination device includes only one boundary between parent frames in the field to be determined, the two parent frames of the input interlaced signal are used. If the difference between the programs cannot be detected, it is decided to perform the interpolation by the field.
- the file is determined to include more boundaries between the parent frames.
- the number of fields it is possible to evaluate the correlation between the parent frame and the field in multiple steps. From this point of view, the larger the number of fields to be judged, the more the field interpolating method determining device can identify the video signal more accurately. it is obvious. In other words, in order to more accurately identify a video signal, it is desirable to increase the number of fields to be judged to infinity. Therefore, the number of registers that memorize the differences between the fields increases infinitely, so that the cost of the field-capturing method determining device also increases infinitely. I will.
- a judgment is made based on a difference between at least a predetermined number of fields including a boundary between two frames. Changes the number of fields to dynamic. Therefore, if the number of fields converted from the two parent frame powers is N1, the difference between at least N fields is determined. That is, the number of differences between the fields to be judged is at least N-1.
- the threshold for judging the difference between the fields is dynamically changed.
- the number of fields to be judged or the threshold for detecting a difference between the fields is dynamically determined. It is possible to more accurately identify a video signal by changing the image signal.
- the telecine signal in which the context of the field converted from the parent frame force is reversed is different from that of the parent frame.
- the two fields converted from the frame are interpolated with each other and converted into one frame. As a result, since different images are mixed in one frame, the video quality of the converted progressive signal is significantly degraded.
- the present invention determines the relationship between a field and a parent frame in a signal obtained by converting a progressive signal into an interlaced signal, and determines each field of the interlaced signal. Interpolation is performed by either interpolation between fields or interpolation within a field.A typical example of a signal obtained by converting a progressive signal to an interlace signal is used as an example. Next, a case will be described in which a telecine-converted signal converted by the 2-2 pull-down method is detected.
- the video signal processing apparatus 100a shown in the figure determines the relationship between the field of the input interlace signal and the parent frame, and the input interlace signal is converted to the text. If the signal is a cine-converted signal, Converts the fields of the input interlaced signal to frames of the progressive signal by inter-field interpolation. On the other hand, when the input interface signal is not a telecine-converted signal, the video signal processing apparatus 100a performs finalization of the input interface signal by intra-field interpolation. To a progressive signal frame.
- the video signal processing device 100a includes an input terminal 1, a field memory 2, a field memory 4, a subtractor 6, and a field capturing method determining section 8a. , ODDZEVEN detector 10, first switch 12, line memory 14, two line interpolator 16, second switch 18, and programming A sib signal generator 20 is included.
- Input terminal 1 Field memory 2, Field memory 4, Subtractor 6, ODDEVEN detector 10, First switch 12, Line memory 1 4 and 2 line intercepting section 16, second switch 18, and progressive signal generating section 20 are provided by conventional video signal processing apparatus 2 shown in FIG. 11. Description is omitted because it is the same as 0 0.
- the field interpolation method determining unit 8a determines the field of the input interface and the parent frame based on the pixel level difference Sp. 1 field delay input interlaced signal Vd1 is converted to a programmable signal by either inter-field interpolation or intra-field interpolation. Decide whether to do so.
- the field interpolation method determination unit 8a Logarithmic unit 81, pixel difference judgment comparator 82, accumulator 83, inter-field correlation judgment comparator 84, first register 85, second register 86, It includes a third register 87, a fourth register 88, a 4-field correlation judgment comparator 89, a reset judgment unit 90, and a switch 91.
- a timing generation circuit generates a field clock V P and a frame panorama F P.
- the absolute value unit 81 calculates the absolute value of the inter-field pixel level difference Sp calculated by the subtractor 6, and calculates the absolute value of the inter-field pixel level difference Sp A as And output.
- the subtractor 6 calculates the difference between the average value of the pixel levels of two adjacent lines of one field and the corresponding pixel level of the other field. .
- the pixel difference determination comparator 82 compares the pixel level difference absolute value SpA between the fields with a predetermined first threshold value X, and determines the pixel level of each pixel of the two fields. Judge whether there is a difference (significant difference) greater than the degree that the difference in the veneer is recognized as being derived from the same parent frame.
- the first threshold value is such that the pixel level difference between the fields divided from the same frame force is such that it is determined that there is no significant difference.
- the pixel difference judgment comparator 82 sets the inter-field pixel judgment signal Dp indicating the judgment result to “1” when the above judgment is “significant difference”. Is output, and if there is no significant difference In this case, "0" is output.
- the accumulator 83 outputs an inter-field pixel difference judgment accumulated value C Dp which is a value obtained by accumulatively adding the inter-field pixel difference judgment signal D p.
- the pixel-to-field pixel difference judgment cumulative value CDp is calculated based on the field of the input interface signal Vin and the field of the one-field delayed input interlace signal Vdl. This is a value indicating the number of pixels determined to be "significantly different" from the field.
- the cumulative adder 83 is reset for each field by the field pulse VP.
- the inter-field correlation judgment comparator 84 includes a field for the input interface signal Vin and a field for the one-field delay input interface signal Vd1. It is determined whether or not the field and the field have such a correlation as to be regarded as a field divided from the same frame power. Specifically, the inter-field correlation judgment comparator 84 determines whether the inter-field pixel difference judgment accumulated value CD p is larger than a predetermined threshold Y, or not. Is determined to have no correlation. On the other hand, if the inter-field pixel difference judgment accumulated value CD p is equal to or smaller than the predetermined threshold Y, the inter-field correlation judgment comparator 84 has a correlation between the fields. Is determined. Then, the value of the inter-field correlation determination signal Df that outputs the inter-field correlation determination signal Df indicating the above determination result is “0” when there is a correlation, and On the other hand, if there is no correlation, it is “1”.
- the first register 85, the second register 86, the second register 87, and the fourth register 88 are D flip-flops. And supplied as field pulse VP power S clock It is. These four registers sequentially store four consecutive field-to-field correlation determination signals Df, respectively. In addition, the stored values of the correlation determination signals between the four fields are output as register output signals (R1 to R4).
- the four-field correlation judgment comparator 89 compares the four register output signals (R 1 to R 4) with the telecine judgment table Tc and outputs the currently input video. It is determined whether the signal has a pattern of inter-field correlation in the telecine-converted signal.
- the table T c shown in FIG. 3 is the telecine determination table T. It is.
- the output values of the four register output signals (R1 to R4) shown in Table Tc are "0101" and "0101", respectively.
- the correlation coincides with the characteristics of the telecine-converted signal of the 221 pull-down system in which the magnitude changes alternately.
- the four-field correlation determination comparator 89 determines that the input interlace signal V in is a telecine-converted signal. Then, the four-field correlation determination comparator 89 outputs a telecine determination signal Ds.
- the reset determiner 90 compares the four register output signals (R1 to R4) with the reset determination table Tr to ensure that the currently input video signal is correct. It is determined whether or not there is a telecine conversion signal.
- the table Tr shown in FIG. 3 is the reset determination table Tr. All of the notations shown in the reset table Tr changed one of the values of "0" of the four register output signals (R1 to R4) to "1". Even 2 — 2 prudau It cannot be “0101” or “10110” that matches the pattern of the field-to-field correlation in the telecine-converted signal of the system.
- the reset determiner 90 outputs a reset signal Rst.
- the table T1 shown in FIG. 3 shows four register output signals (R1 to R1) that do not belong to any of the telecine determination table Tc and the reset determination table Tr. 4) is shown.
- the output value of each register shown in Table T1 is a 2–2 pull-down type of register if the output value of at least one or more registers changes from “0” to “1”. This matches the pattern of the inter-field correlation in the cine-converted signal.
- the switch 91 is connected to the one-field delay input interface signal Vd1 based on the telecine determination signal Ds and the reset signal described above. Outputs a field interpolation method instruction signal D vl that indicates whether to perform inter-field interpolation or intra-field interpolation.
- the switch 91 when the telecine determination signal D s is output, the switch 91 outputs a field interpolation method instruction signal DV 1 for instructing inter-field interpolation.
- a field interpolation method instruction signal D vl indicating the field trapping is output. If neither the telecine determination signal nor the Ds reset signal R st is output, the switch 91 is turned off by the filter. Do not change the interpolation signal Dv1.
- the input interface signal V in has the parent frames A, B, and C of the progressive signal, respectively, A 1 and A 2, B 1 and B 2, and It has been converted to C 1 and C 2.
- Each field of the input interface signal Vin1 is input to the field No. in ascending order.
- the correlation between the two fields is determined based on the difference between the input interlace signal V in and the one-field delay input interlaced signal Vd1. For example, a field B2 which is the field No. 4 of the input interface signal Vin and a one-field delay input interface signal Vd1 The correlation with the field B1 is determined. In this case, the difference between the fields is small because both fields are converted from the same frame B force. That is, it is determined that there is a correlation, and the value of the field correlation determination signal Df is “0”.
- the fields C1 and 1 of the input interface signal Vin's field input delay field Since the frame signal is converted from a frame force different from that of the field B2 of the interlaced signal Vd1, the difference is large. That is, it is determined that there is no correlation, and the value of the field correlation determination signal Df is “1”.
- the field correlation determination signal Df is sequentially stored in four registers 85 to 88, and four consecutive register outputs are set to "0101" or " 1 0 1 0 ".
- the switch 91 outputs a signal for instructing field-to-field interpolation as an interpolation method instruction signal DV1.
- the first switch 12 is connected to the input interface signal V oe based on the field identification signal Doe obtained by the ODD / EVEN detector 10. in and the two-field delayed input interlaced signal Vd2.
- the delayed input interlaced signal Vd1 is an odd field. In this case, the input interlace signal Vin is selected.
- the 2-field delay input interlaced signal Vd2 is selected.
- the progressive signal is used as the interpolation target signal.
- the field input to the generation unit 20 is the field KB1 of the field No. 3.
- the interfield interpolation is performed by using the field buffer 'B2 obtained by the input interlaced signal Vin as the interception signal Sw2.
- the input signal is programmed as the interpolation signal.
- the field input to the passive signal generator 20 is the field B2 of the field No. 4.
- a field B 1 which is a two-field delay input interface signal Vd 2 is interpolated as the interpolation signal Sw 2.
- the original parent frame B is generated by performing the interfield trapping.
- the parent frame and the field are determined based on the correlation between two fields including only one boundary between the parent frames.
- the telecine conversion signal is detected by detecting the correspondence with the field. If the field interpolation method determination device cannot detect a difference between one frame, the correspondence between the parent frame and the field is unknown. ,
- the input interface signal is not a telecine signal.
- the field interpolation method determining apparatus determines the number of differences between fields such that two or more boundaries between frames are included. It is said that. For this reason, even if a difference between one frame cannot be detected, it is determined whether or not the input interlaced signal is a telecine-converted signal based on the difference between a plurality of frames. be able to. In addition, since the boundaries of a plurality of frames are included in the judgment target, the entire field to be judged can be evaluated in multiple stages based on the judgment on the boundary of each frame. .
- the field interpolation method determining apparatus can Even when a telecine-converted signal whose difference is difficult to detect is input, the field interpolation method can be determined more accurately.
- the field interpolation method determination device allows the image to be bright even when the difference in pixel level between the parent frames is small because the image is dark. By changing the threshold for judging the pixel difference between the fields in response to this, the difference between the fields due to the difference between the frames is detected. Is characterized by
- the video signal processing apparatus 100b shown in FIG. 5 is different from the video signal processing apparatus according to the first embodiment in that the field interception method determination unit 8a
- the configuration has been replaced with the field interpolation method determination unit 8b.
- description of the same components as those of the video signal processing device according to the first embodiment will be omitted.
- the video signal processing device 100b is composed of an input terminal 1, a field memory 2, a field memory 4, a subtractor 6, and a field capturing method determining section 8b. , ODD / EVEN detector 10, first switch 12, line memory 14, 2 line interceptor 16, second switch 18, etc. ⁇ Includes progressive signal generator 20.
- the field interpolation method determination unit 8b is a 1-field delay input counter, Shingo Vd1, and the pixel level between fields. Based on the difference Sp, the relationship between the field of the input interface and the parent frame is determined, and the interpolation between the fields and the interpolation without the field are determined. In each case, the power to convert the one-field delay input interlaced signal Vd1 into a progressive signal is determined.
- the field interpolation method determination unit 8b is different from the field interpolation method determination unit 8a according to the first embodiment in that the switch 91 has a counter 92 and a counter 92. It has a configuration in which an auto-picture level (APL) detector 94b and a pixel difference threshold value changing unit 95b are added.
- APL auto-picture level
- the field interpolation method determination unit 8b includes an absolute value unit 81, a pixel difference judgment comparator 82, an accumulator 83, a field correlation judgment comparator 84, a first Register 85, second register 86, third register 87, fourth register 88, 4-field correlation judgment comparator 89, It includes a set decision unit 90, a counter 92, a count decision comparator 93, an auto picture level detector 94b, and a pixel difference threshold changing unit 95b.
- the auto picture level detector 94b detects the signal level PL of the one-field delay input interlaced signal Vd1.
- the signal level PL is higher as the image is brighter and lower as the image is darker.
- the pixel difference threshold changing unit 95b changes the value of the pixel difference threshold Xb according to a predetermined rule based on the signal level PL. For example, a plurality of pixel difference thresholds corresponding to the level of the signal level PL. The value of the value Xb may be determined in advance, and the value of the corresponding pixel difference threshold Xb may be output according to the input signal level P, or the signal level may be determined according to a predetermined formula. The value of the pixel difference threshold Xb may be obtained from the PL force.
- the value is set such that the higher the signal level PL, the larger the value of the pixel difference threshold Xb, and conversely, the lower the signal level PL, the smaller the value of the pixel difference threshold Xb.
- the pixel difference determination comparator 82 sets the value of the pixel difference threshold value Xb to be low when the one-field delay input interlaced signal Vd1 is dark. Since the difference is small, it is determined that there is a difference in pixel level between the fields even if the difference is smaller. On the other hand, in the case of an image where the one-field delay input interface signal Vd1 is bright, the value of the pixel difference threshold Xb is large, and therefore, the image is converted from the same frame power.
- the counter 92 which can prevent an erroneous judgment such as judging that there is a pixel level difference between the fields, is countered by the telecine judgment signal Ds.
- the frame is reset by the reset signal R st, and as described above, if there is no or small difference between the frames of the parent frame, a different frame is used. Since the difference between the fields converted from the data is not detected, the telecine-converted signal may not be determined to be the telecine-converted signal. For this reason, it is difficult to determine whether the input interface signal Vin is a telecine-converted signal or not. In this case, the count of the telecine judgment counter 92 is unchanged.
- the count decision comparator 93 sets the telecine decision accumulated value CD s of the counter 92 to be smaller than a predetermined threshold Z. Becomes larger, the field for instructing the field of the one-field delay input interface signal Vd1 to perform the inter-field interpolation is performed. Outputs the field interpolation mode instruction signal DV1.
- the threshold value Z is set as the time from when the telecine determination signal Ds is output to when the field interpolation is actually performed, and is usually 0.5 seconds. Is set to be.
- the video signal processing device does not have a risk of erroneous detection of a bright image, and even if the difference in pixel level between frames is small because the image is dark, Differences between fields can be detected more accurately.
- the first threshold value X is dynamically changed based on the signal level PL of the one-field delay input interface signal Vd1.
- the second threshold value Y may be changed.
- a video signal processing device incorporating a field capturing method determination device is described. explain about.
- the order of the odd field and the even field with respect to the parent frame is reversed. If an interlace signal is input, the fields of different parent frames will be interpolated between the fields. As described above, when fields converted from different parent frames are inter-field interpolated, the video quality of the generated frames is significantly reduced.
- the field interpolation method determining apparatus includes an interface signal in which the front-rear relationship between the odd field and the even field with respect to the parent frame is reversed, In other words, even when an interlace signal is input in which the parent frame is converted into an even field and an odd field immediately following it, different frame powers are input. It is characterized in that it is possible to prevent erroneous interpolation of the fields converted from the fields.
- the video signal processing apparatus 100c shown in FIG. 7 is different from the video signal processing apparatus according to the first embodiment in that The configuration has been replaced with the field interpolation method determination unit 8c.
- description of the same components as those of the video signal processing device according to the first embodiment will be omitted.
- the video signal processing device 100 c includes an input terminal 1, a field memory 2, a field memory 4, a subtractor 6, and a field capturing method determining unit 8 c , ODDZEVEN detector 10, first switch 12, line memory 14, 2 line interceptor 16, second switch 18, and progressive Signal generator Includes 2 0.
- the field interpolation method determining unit 8c determines the field of the input interface based on the field identification signal Doe and the pixel level difference Sp between the fields. Judges the relationship between the field and the parent frame and determines whether it is interfield interpolated or unfielded interpolated by one field delay input interleave. Determines whether to convert the source signal V d 1 into a progressive signal.
- the field capturing method determining unit 8c is different from the field interpolating method determining unit 8 according to the first embodiment in that an AND circuit 96c is added.
- the field interpolation method determining section 8 c that is provided includes an absolute value calculator 81, a pixel difference judgment comparator 82, a cumulative adder 83, and a field correlation judgment comparator 84.
- the logical product circuit 96c obtains a logical product of the inter-field difference signal D f and the field identification signal D oe and outputs a corrected inter-field difference signal D fa. .
- the modified interfield difference signal Dfa will be described with reference to FIG.
- the ODDZEVEN detector outputs “0” as the field identification signal D oe when the 1-field delay input interface signal Vd1 is an odd field. On the other hand, when the one-field delay input interlaced signal Vd1 is an even field, it outputs "0" as the field identification signal Doe.
- the value of the corrected inter-field difference signal D fa is the same as the inter-field difference signal D f, so that the tele-cine conversion signal detection result is used. There is no effect on the cine detection signal Vd3.
- the field interpolating method determining apparatus can prevent a remarkable decrease in video quality, it interpolates in the field, so that the telecine is used. Even if it is a converted signal, it cannot be converted back to the original parent frame to improve the vertical resolution.
- the field interpolating method determining apparatus is characterized in that an interlace signal in which the order of the odd field and the even field with respect to the parent frame is reversed. Even if a field is input, the fields converted from the same parent frame force are interpolated between the fields.
- the field interpolation method determining apparatus selectively reverses the value of the field identification signal Doe to provide a field interpolation method determining section 8c and a first field interpolation signal determining section 8c. This is characterized in that it is output to the switches 12 and 13.
- the video signal processing apparatus 100c shown in FIG. 9 is different from the video signal processing apparatus according to the third embodiment in that it includes an inverter 22d and a field. An identification signal reverse switch is added. It has a good configuration. In order to avoid redundant description, description of the same components as those of the video signal processing device according to the first embodiment will be omitted.
- the video signal processing device 100 d includes an input terminal 1, a field memory 2, a field memory 4, a subtractor 6, a field interpolation method determining section 8 c, ODD / EVEN detector 10, 1st switch 12, line memory 14, 2 line interceptor 16, 2nd switch 18, program It includes a passive signal generator 20, an inverter 22d, and a field identification signal change switch 23d.
- the inverter 22d receives the field identification signal D Oe and outputs a field identification inverted signal nD oe obtained by inverting the value of the signal.
- the field identification signal change switch 23d is used as the field identification signal Swf to be the field identification signal Doe or the field identification inverted signal nDoe. Selectively output either.
- the field identification signal change switch 2 3 d By switching the signals, the signals output to the field interpolation method determination unit 8c and the first switch 12 are converted to the field identification inverted signal n D Switch to oe.
- the video signal processing device is an interlace signal in which the order of the odd and even fields with respect to the parent frame is reversed. It can be converted to a progressive signal with improved vertical resolution by means of field interpolation.
- the apparatus for determining a method for capturing fields according to the present invention cannot specifically detect a difference between parent frames, or even if it is difficult to detect a difference between the parent frames.
- the number of fields to be judged-The threshold value for judging the correlation between the fields is changed to dynamic, and the fields of the input interface signal are changed. By accurately detecting the relationship between the frame and the parent frame, it is possible to determine whether to interpolate between the fields or to interpolate between the fields.
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Description
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003581494A JP3865732B2 (ja) | 2002-04-01 | 2003-03-28 | フィールド補間方式決定装置 |
| EP03715568A EP1492344A4 (en) | 2002-04-01 | 2003-03-28 | FELDINTERPOLATIONSVERFAHREN DETERMINATION DEVICE |
| US10/509,572 US7453518B2 (en) | 2002-04-01 | 2003-03-28 | Field interpolation method determination device |
| CN03807981XA CN1647522B (zh) | 2002-04-01 | 2003-03-28 | 场内插方法判定装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002098368 | 2002-04-01 | ||
| JP2002-98368 | 2002-04-01 |
Publications (1)
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| WO2003084227A1 true WO2003084227A1 (en) | 2003-10-09 |
Family
ID=28671949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2003/003927 Ceased WO2003084227A1 (en) | 2002-04-01 | 2003-03-28 | Field interpolation mehtod determination device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7453518B2 (ja) |
| EP (1) | EP1492344A4 (ja) |
| JP (1) | JP3865732B2 (ja) |
| CN (1) | CN1647522B (ja) |
| WO (1) | WO2003084227A1 (ja) |
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| JP2009278326A (ja) * | 2008-05-14 | 2009-11-26 | Sony Corp | 信号判別装置、信号処理装置、画像表示装置および再生装置 |
| US7675572B2 (en) | 2004-10-06 | 2010-03-09 | Samsung Electronics Co., Ltd. | Image processing device capable of selecting field and method thereof |
| JP2014165886A (ja) * | 2013-02-27 | 2014-09-08 | Kddi Corp | フィールドオーダ検出装置 |
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| US8120703B2 (en) | 2005-09-08 | 2012-02-21 | Silicon Image/BSTZ | Source-adaptive video deinterlacer |
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| US7982798B2 (en) | 2005-09-08 | 2011-07-19 | Silicon Image, Inc. | Edge detection |
| JP4936857B2 (ja) * | 2006-10-31 | 2012-05-23 | 株式会社東芝 | プルダウン信号検出装置、プルダウン信号検出方法及び順次走査変換装置 |
| US8086067B2 (en) | 2006-12-20 | 2011-12-27 | Silicon Image, Inc. | Noise cancellation |
| KR101329075B1 (ko) * | 2007-03-20 | 2013-11-12 | 엘지디스플레이 주식회사 | 액정표시장치 및 그의 구동 방법 |
| US20080304568A1 (en) * | 2007-06-11 | 2008-12-11 | Himax Technologies Limited | Method for motion-compensated frame rate up-conversion |
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| US8452117B2 (en) | 2009-02-10 | 2013-05-28 | Silicon Image, Inc. | Block noise detection and filtering |
| JP5460710B2 (ja) * | 2009-12-25 | 2014-04-02 | パナソニック株式会社 | 映像信号処理装置 |
| CN102300071A (zh) * | 2010-06-22 | 2011-12-28 | 上海高清数字科技产业有限公司 | 电影模式视频信号处理方法和装置 |
| US8804813B1 (en) * | 2013-02-04 | 2014-08-12 | Faroudja Enterprises Inc. | Progressive scan video processing |
| US8928808B2 (en) * | 2013-05-24 | 2015-01-06 | Broadcom Corporation | Seamless transition between interlaced and progressive video profiles in an ABR system |
| US10211818B2 (en) * | 2016-07-06 | 2019-02-19 | Via Alliance Semiconductor Co., Ltd. | Interpolator |
| JP2022173762A (ja) * | 2021-05-10 | 2022-11-22 | ウーブン・プラネット・ホールディングス株式会社 | 動画通信方法、動画通信システム、及び受信側装置 |
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- 2003-03-28 JP JP2003581494A patent/JP3865732B2/ja not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| JP3865732B2 (ja) | 2007-01-10 |
| CN1647522A (zh) | 2005-07-27 |
| US20050254792A1 (en) | 2005-11-17 |
| CN1647522B (zh) | 2010-04-07 |
| EP1492344A4 (en) | 2010-10-13 |
| US7453518B2 (en) | 2008-11-18 |
| JPWO2003084227A1 (ja) | 2005-08-11 |
| EP1492344A1 (en) | 2004-12-29 |
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