JP3398396B2 - Video signal processing circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION
-3 pull down method for telecine video signal
To process using multiple scan line signals.
And a video signal processing circuit that is suitable. [0002] 2. Description of the Related Art The current television system (NTSC method)
Expression), one frame is divided into two fields by interlaced scanning.
And 30 frames per second (60 fields)
The number of images in the field. In contrast, 16mm and 35
Standard movie films such as mm are 24 frames per second. this
Form video signal (telecine video signal) from movie film
Conventionally, the 2-3 pull-down method is known
I have. In the 2-3 pull-down method, the n-th
Film every 3 fields (3/60 seconds)
Frame advance, and 2 films for the (n + 1) th film.
Frame (2/60 seconds)
And the five fields of the video signal. That
Therefore, a telecine image formed by the 2-3 pull-down method
The signal is a three-field image formed from the same film.
The image signal and the video signal of two fields were alternately repeated
It will be. [0004] For example, as shown in FIG.
No. 1 to 3 fields are formed, and from the second frame
No. Fields 4 and 5 are formed.
o. Fields 6 to 8 are formed.
o. 9, 10 fields are formed. Below,
It becomes repetition. By the way, a high-definition television system is used.
Thus, a so-called high-vision system has been proposed. Yes
In the vision system, the number of scanning lines is 1125 lines / frame
60Hz, field frequency, interlace ratio
Is 2: 1 and the aspect ratio is 16: 9. In contrast
Therefore, in the NTSC system, the number of scanning lines is 525 lines / frame.
Frame, field frequency 60Hz, interlace
The ratio is 2: 1, and the aspect ratio is 4: 3. Here, the Hi-Vision program is
Used in TV broadcasting (eg NTSC system)
Is also conceivable. So, conventionally, for example,
Conversion from NTSC to NTSC has been proposed. This one
Example of scan line conversion (down conversion) in equation conversion
Will be described. [0007] When the image is a still image, as shown in FIG.
Una 562.5 lines / field
As shown in FIG.
1125 lines / frame progressive scanning video signal
A signal is formed. This 1125 lines / frame video signal
By performing more weighting processing, 525 as shown in FIG.
A video signal of the book / frame progressive scanning method is formed.
Then, from the 525 lines / frame video signal, FIG.
NTSC system of 262.5 lines / field as shown in
Are formed. in this case,
Hi-Vision odd / even field video signals
The video signal of the odd / even field of the NTSC system is used
And a high-resolution video signal is obtained. On the other hand, when the image is a moving image, FIG.
A high vision of 562.5 lines / field as shown in A
Video signals in the odd and even fields of the
By performing the weighting process, 26 as shown in FIG.
2.5 / field NTSC odd / even field
Is formed. In this case, the HD system
NT using each of the odd-even field video signals
An odd / even field video signal of the SC system is formed, and the
Displacement is prevented. [0009] By the way, as described above,
Down depending on whether the image is a still image or a moving image.
It is necessary to detect the motion of the image to make the conversion process different.
It is necessary. When detecting erroneous motion, the
Moving image processing on the image signal to reduce the resolution, or
Causes still image processing on the video signal of
There was an inconvenience. This is HDTV
Video signal is formed by the 2-3 pull-down method described above.
The same applies to the telecine video signal obtained. Therefore, in the present invention, for example, 2-3 pull
Scanning of telecine video signal formed by down system
When performing line conversion processing, resolution drop due to incorrect motion detection
It is intended to prevent image quality deterioration such as image shift and the like. [0011] A video signal according to the present invention
The processing circuit is interlaced with twice the number of scanning lines
Normal scanning of the field format of the video signal
Field of interlaced video signal with number of lines
A video signal processing circuit for converting to a format
hand,Interlaces where the input signal has twice the number of scan lines as normal
Video signal of the scanning method or has twice the number of scanning lines as normal
Video signal5 frames for 2 frames of movie film
Convert todo itVideo signal of 3 fields / frame and 2 fees
Le2-3 puller for alternately sending video / frame video signals
Formed fromDetermine whether the signal is a telecine video signal.
Separate signal discriminating means, and writing and reading of the video signal.
The interlaced scanning method having a memory in which scanning is performed
Scanning to convert video signals of
Based on the result of the discrimination by the signal conversion means and the signal discrimination means.
And writing of the video signal to the progressive scan conversion means.
A control signal generation circuit for controlling reading of the
The video signal isSaidTelecine video signal
When the video signal is determined to be 5
In the video signal of 3 fields / frame among the fields
1st or 3rd field where the signal content is the same
The progressive scan conversion means so as to delete any one of
A control signal generation circuit for controlling writing and reading ofPrevious
Switch circuit controlled by the control signal generation circuit.
Interlaced scanning method with double the number of scanning lines
Video signal or converted by the progressive scan conversion means
A switch for selecting one of the progressive scanning video signals
Switch circuit and a normal circuit selected by the switch circuit.
Interlaced scanning video signals with twice the number of scanning lines
Is a progressive scanning method converted by the progressive scanning conversion means.
For the video signal ofSignal processing means for performing scan line conversion processing
WithThe signal processing means has a built-in motion detection circuit.
The signal processing means is input by the signal discriminating means.
The force signal is a video signal having twice the number of scanning lines as normal
If it is determined that the video signal is not the telecine video signal,
And the control signal generating circuit scans twice the normal scanning.
Select an interlaced video signal with the number of lines.
The switch circuit is controlled as
The presence of motion in the image of the input video signal
Detection circuit IfEnteredSaidThrough
Has twice the number of scanning linesInterlaced scanningVideo signal
Image with a normal number of scan lines from the odd field image
While forming an image of the odd field of the image signal,
EmpoweredSaidHas twice the number of scanning lines as normalInterlaced scanning
FormulaFrom the image of the even field of the video signalSaidNormal
The image of the even field of the video signal having the number of scanning lines is formed.
AndOf the video signal input from the switch circuit
The motion detection circuit detects that there is no motion in the image.
IfEnteredSaidHas twice the number of scanning lines as normal
ToInterlaced scanningVideo signalFrom the normal scanning method
Of a video signal having twice the number of scanning linesOne frame image
FormingOf the progressive scanning methodHas twice the number of scanning lines as normal
From one frame image of the video signalProgressive scanningNormal
Of one frame of video signal having the number of scanning lines
AndSaidHas normal number of scanning linesProgressive scanningVideo signal
From one frame image of the issueTheHas normal number of scanning lines
Image of odd field and even field of video signal
Forming an image andAnd the signal processing means is configured to output the signal
The input signal is the telecine video signal by another means
Is determined by the control signal generation circuit.
Of the progressive scanning method read from the progressive scanning conversion means.
The switch circuit is controlled to select the video signal.
And the video signal input from the switch circuit
Without detecting the motion of the image of
Normal scanning from the progressive scanning video signal input from the stage
Of one frame of the video signal of the progressive scanning method having the number of scanning lines
A sequential scanning method that forms an image and has the normal number of scanning lines
From the image of one frame of the video signal of the formula
The image of the odd field of the video signal having
Field image and formIt is characterized by
You. [0012] According to the video signal processing circuit of the present invention,
Of interlaced video signals with twice the number of scanning lines
Field format jumps with normal number of scan lines
Change to the field format of interlaced video signals
In this case, the detection of the telecine signal shown in FIG.
In the road (signal discriminating means) 5, the input video signal Vin isNormal
This is an interlaced video signal with double the number of scanning lines.
Or a video signal having twice the number of scanning linesMovie
Convert 2 frames of drawing film into 5 fieldsdo it3 fees
Field / frame video signal and 2 fieldsVideo signal
Is formed by a 2-3 pull-down system that sends alternately
WasIt is determined whether the signal is a telecine video signal. Progressive scan
Field memories 8 and 9 constituting a switching means, and a switch memory.
On the roads 10 and 11, video signals are written to these memories 8 and 9.
And the video signal Vin from these memories 8 and 9
Reads out the video signal of the interlaced scanning method
It is converted into a video signal of the formula. In the control signal generation circuit 7,
Field memory based on the determination result by the detection circuit 5
Control of writing and reading of video signal Vin to 8 and 9
Is done.The switch controlled by the control signal generation circuit 7
In the switch circuit 11, a jump having twice the number of scanning lines as the normal number is used.
The signal is changed by the interlaced scanning video signal or the progressive scan conversion means.
Select one of the converted progressive scan video signals
It is made to do.Assuming this, control signal generation
In the circuit 7, the video signal Vin is detected by the detection circuit 5 as a text.
When the video signal is determined to be a cinema video signal,
3 fields out of 5 consecutive fields at Vin
1st or 3rd video signal with the same signal content
Field to delete one of the
Control the writing and reading of the field memories 8 and 9. Faith
Hi-Vision NTSC scan conversion as an example of signal processing means
In circuit 12,The input video signal Vin is detected by the detection circuit 5
A video signal Vin having twice the number of scanning lines as normal
When it is determined that the signal is not the cine video signal Vin,
Control signal generation circuit 7 has twice the number of scanning lines as normal
Switch to select the interlaced scanning video signal Vin
Switch circuit 11 is controlled, and input from this switch circuit 11 is performed.
It is detected that there is motion in the image of the input video signal Vin.
If detected by the output circuit ,Twice the normal input
Has the number of scanning linesInterlaced scanningThe oddness of the video signal Vin
A video signal with a normal number of scanning lines from an image of several fields
The image of the odd field of the signal Vin is formed,
Has twice the number of scan lines as normalInterlaced scanning
ExpressionNormal running from the image of the even field of the video signal Vin
The image of the even field of the video signal Vin having the number of scanning lines is
It is formed. Also,The image input from the switch circuit 11
The motion detection circuit determines that there is no motion in the image of the image signal Vin.
If it is detected,Double the number of scanning lines
HaveInterlaced scanningVideo signal VinScanning from
Of the video signal Vin having twice the number of scanning lines1 frame
Image is formed.After that, the progressive scanning methodNormal
Of one frame of the video signal Vin having twice the number of scanning lines
From the statueProgressive scanningVideo signal with normal number of scanning lines
An image of one frame of Vin is formed, and the normal number of scanning lines is reduced.
HaveProgressive scanningOne frame image of video signal Vin
FromTheOdd-numbered video signal Vin having a normal number of scanning lines
Field image and even field image are formed.
You.MoreHDTV NTSC scanning line conversion circuit 12
ThenThe input signal is a telecine video signal by the detection circuit 5.
If it is determined to be Vin, the control signal generation circuit 7
Of the sequential scanning method read from the memories 8 and 9 by the
Switch circuit 11 controls to select video signal Vin
The video input from the switch circuit 11
Without detecting the motion of the image of the signal Vin, the memory 8,
9 from the progressive scanning video signal Vin read from
1 of the progressive scanning video signal Vin having the normal number of scanning lines
A frame image is formed, and the image has a normal number of scanning lines.
Of one frame of the video signal Vin of the progressive scanning method
From the odd number of the video signal Vin having the normal number of scanning lines.
A field image and an even field image are formed.
Therefore, the telecine formed by the 2-3 pull-down method
When the video signal Vin is supplied, 3 fields / frame
Of the video signal Vin having the same content as the first or
Either one of the third fields must be deleted before scan line conversion.
Fields that have been removed and removed from this scanline conversion.
Video signal V of the progressive scanning method of the remaining four fields except for
set in to interlaced even and odd fields
The field format is changed to a 2-frame video signal Vin.
Can be exchanged. Thus, 3 fields / frame
The video signal Vin having the same contents is subjected to scanning line conversion processing.
Resolution, which may cause a drop in resolution due to erroneous motion detection.
Image quality deterioration such as image shift can be avoided. [0013] In this case, the progressive scan conversion means performs the
Of odd / even fields formed from the same frame
A video signal of progressive scanning is formed from a video signal
given that,Coding every three fields by 2-3 pull-down method
One odd field for the film frame to be fed
And one of two even fields of the same frame
Interpolation with one even field is enough
Karika,Even for moving images, no image
This does not happen. [0014] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An example will be described. This example uses the HDTV systemOf the
Field format of image signalTo NTSCOf the
Field format of image signalTo scan line conversion (down
Convert). In FIG. 1, an input terminal 1 has a high vision
The video signal Vin is supplied. The video signal Vin is
The delay circuit (1 frame)
Of the field memories 3 and 4 constituting the delay time
The signal is supplied to the subtractor 2 via a serial circuit. From subtractor 2
The output difference signal SDF between one frame is 2-3 pull down.
The video signal is supplied to the detection circuit 5 for the telecine video signal of the system.
Note that a frame memo is used instead of the field memories 3 and 4.
May be used. The video signal V supplied to the input terminal 1
in is supplied to the timing generation circuit 6. timing
The generation circuit 6 includes a synchronization separation circuit, a PLL circuit, and the like.
Based on the synchronization signal separated from the video signal Vin.
Clock CK, line synchronization signal corresponding to odd / even lines
No. LO / E, field pulse VP, frame pulse FP
Is formed. Detection described above by the timing generation circuit 6
The circuit 5 is supplied with a field pulse VP. FIG. 2 is a circuit diagram of the detection circuit 5 for the telecine video signal.
The specific configuration is shown. In FIG.
The absolute value of the difference signal SDF between one frame is calculated by the absolute value circuit 21.
After being taken, it is supplied to the integrating circuit 22 and integrated. product
The integrated value in the arithmetic circuit 22 is the sum of the field pulse VP
Reset on rising edge. The integrated output from the integrating circuit 22 is a comparator.
And is compared with a predetermined threshold value Vth. Con
The comparison output of the parator 23 is such that the integrated output is smaller than the threshold value Vth.
At that time, it becomes "0", while the integrated output is more than the threshold value Vth.
Becomes "1". The comparison output from the comparator 23 is
(D flip-flops) 24-28
Be paid. Registers 24-28 have a field pulse
VP is supplied as a clock. Registers 24-28
Is supplied to the OR gate 29. The output signal of the OR gate 29 and the register
A signal obtained by inverting the output signal of the
And output signals of registers 24-27 are provided by AND gate 31.
And the output signal of the AND gate 31 is detected.
The output signal of the road 5 is used. As described above, the shape is formed by the 2-3 pull-down method.
The generated telecine video signal isFrame advance every three fields
About the film frameNo. 1 and No. 3 odd
Number field, No. 6 and no. 8 even fields
They are equal (see FIG. 11).In this example,
No. No. 1 odd field and No. 1 field. 6 Even Feel
Is deleted.Therefore, input terminal 1
The supplied video signal Vin is formed by 2-3 pull-down method
If the received telecine video signal is No. 1,6F
And the input signals of the AND gate 31 are all "1"
And the output signal of the AND gate 31 becomes "1" (FIG.
3C). FIG. 3A shows the video signal Vin. Returning to FIG. 1, the output signal of the detection circuit 5 is
Supplied to control signal generation circuit 7 as recine cut signal STC
Is done. The control signal generation circuit 7 includes a timing generation circuit
From 6, clock CK, line synchronization signal LO / E, field
Pulse VP and a frame pulse FP are supplied. The video signal V supplied to the input terminal 1
in is supplied to the field memories 8 and 9. These notes
Write control signals from the control signal generation circuit 7
Signals W1 and W2 and read control signals R1 and R2
Is done. The control signals W1, W2, R1, R2 are odd and even.
Using the field sync signal FO / E indicating the field
Formed. First, a control signal generating circuit will be described with reference to FIG.
Explanation of the generator of the field synchronization signal FO / E in 7
I do. In FIG. 6, a frame pulse FP (FIG. 6)
B (shown in B) is a predetermined number of shifts via the inverter 41.
It is supplied to a register 42. Shift register 42 shift
Clock CK (shown in Fig. A)
Is done. The output signal of the shift register 42 is a register (D
Flip-flop) 43, 44
You. Further, a field pulse VP (see FIG.
) Is clocked into the register 43 via the inverter 45.
The clock is supplied to the register 44 directly.
Supplied as In the above configuration, the shift register 42
The output signal of the frame pulse FP is inverted and
The signal is delayed by the time (shown in FIG. 6D).
The output signal of the star 43 is as shown in FIG. Soshi
From the register 44, "0" is set in the odd field.
And a field synchronization signal which becomes "1" in an even field.
FO / E is output (shown in FIGS. 6F and 3B). Next, a control signal generating circuit will be described with reference to FIG.
7 describes the generators of the write control signals W1 and W2.
I will tell. FIG. 8A shows a clock CK (FIG. 8A).
Is supplied to AND gates 61 and 62. Also,
The field synchronization signal FO / E (shown in FIG.
To the gate 61 and through the inverter 63
Then, it is supplied to the AND gate 62. Also, Telecineca
The cut signal STC (shown in FIG. 4D) is transmitted through an inverter 64.
Then, it is supplied to AND gates 61 and 62. In the above configuration, the output of inverter 63
The force signal is a signal obtained by inverting the field sync signal FO / E.
(Shown in FIG. 8C), the output signal of the
The signal from the cine cut signal STC is inverted (see FIG.
Illustrated). Therefore, from the AND gate 61, 2-
The above description of the telecine video signal formed by the three pull-down method
10-field cycle (hereinafter referred to as “telecine cycle”)
No.). 3, No. 5, no. 7, no. 9's
The clock CK is gated in the
The signal is output as a signal W1 (illustrated in FIG. F). Also, Ann
From the gate 62 of the telecine cycle. 2, No.
4, no. 8, No. Clock CK in 10 fields
Is gated and output as the write control signal W2.
(Illustrated in FIG. G). When the telecine cut signal STC is "1",
No. of the telecine cycle 1, No. In field 6
Does not output any of the control signals W1 and W2 (see FIG. 8).
F and G show broken lines). Next, a control signal generating circuit will be described with reference to FIG.
7 describes the generator of the read control signals R1 and R2.
I will tell. In FIG. 10, a clock CK (see FIG. 10A)
The field synchronization signal FO / E is shown in FIG.
The signal is supplied to the AND gate 71. Also, telecine cut
The signal STC (shown in FIG. 4C) is a register (D flip-flop).
) 72. The register 72 has a field
Pulse VP (shown in FIG. 4D) is supplied as a clock.
It is. The output signal of register 72 is inverted and
Supplied to the client 71. The output signal of the AND gate 71 is an AND gate.
Are supplied to the ports 74 and 75. Also, the line synchronization signal LO /
E is supplied directly to the AND gate 74 and
It is supplied to an AND gate 75 via a barter 76. La
The in-sync signal LO / E is an odd field even without the above.
This signal is “1” and “0” in the even field.
You. In the above configuration, the output of the register 72
The inverted signal is the inverse of the telecine cut signal STC.
Inverted and delayed by one field period.
(Illustrated in FIG. 10E). From AND gate 71,
No. of the cycle 1, No. Nos. 3 to 6; 8-10
The clock CK is gated and output by the
FIG. F). Therefore, AND gates 74 and 75
From the telecine cycle No. 1, No. 3 ~
6, no. Odd and even lines of 8-10 fields
Clock CK is gated by the read control signal R1.
And R2. Returning to FIG. 1, the control signal generation circuit 7
As described above, the write control signals W1 and W2 are output.
Therefore, the memory 8 stores the telecine cycle No. 3, No.
5, no. 7, no. The video signals of the 9 fields are sequentially
Written (shown in FIG. 3D) and stored in the memory 9
No. of the period 2, No. 4, no. 8, No. 10 figures
Are sequentially written (see FIG.
Shown). Further, the control signal generating circuit 7 described above
The read control signals R1 and R2 are output as follows.
From the memory 8, the telecine cycle No. 3, 4 feel
No. in odd-numbered lines The video signal of field 3 is
No. No. 5 and 6 in the odd lines of the field. 5
Field video signal is no. The oddities of the 8, 9 fields
No. in several lines The video signal of the field No. 7 is No. 7
Nos. 10 and 1 in the odd lines of the field. 9 Fees
3D and 4D are read out (see FIGS. 3E and 4A).
No.) of the telecine cycle from the memory 9. 3, 4
No. in the even line of the field. Video signal of field 2
No. is No. No. 5 and 6 in the even lines of the field.
The video signal of the field No. 4 is No. 4 8, 9 feel
No. on even lines of The video signal of field 8 is
No. In the even lines of the fields No. 10 and No. 1, 10
Are read out (see FIGS. 3G and 4).
B). The numbers given in FIG.
Each line number is shown. The read signals from the memories 8 and 9 are switched
It is supplied to the road 10. The switch circuit 10 has a control signal
A switching control signal (shown in FIG. 4C) is supplied from the generation circuit 7.
In the odd lines where the memory 8 is in the read state,
The memory 8 is selected, while the memory 9 is in a read state.
In the even lines, the memory 9 is selected. Therefore, the switching circuit 10 outputs
No. of the cine cycle In the fields of No. 3 and No. 4, 3 and
No. Video signal of each line of field 2 alternates
No. In the fields of Nos. 5 and 6, No. 5 and N
o. The video signal of each line of the field No. 4 is alternately N
o. In the fields of Nos. 8 and 9, No. 8 and No. 7 of
The video signal of each line of the field is alternately set to No. 1
In the fields of Nos. 0 and 1, No. 10 and no. 9's
The video signal of each line of the field is read out alternately
(Illustrated in FIGS. 3H and 4D). That is, from the switch circuit 10,
The scanned video signal is output. In this case, run sequentially
Inspection of one frame of video signal for two field periods
Is output. Sequential scanning output from switch circuit 10
The converted video signal is supplied to the switch circuit 11. Ma
In addition, the switch circuit 11 has an image output from the memory 4.
Supply video signal with image signal Vin delayed by one frame period
Is done. The control signal generation circuit 7
A switching control signal is provided. Image supplied to input terminal 1
Telescopic signal in which the image signal Vin is formed by the 2-3 pull-down method
The control signal generating circuit 7 from the detecting circuit 5
When the telecine cut signal STC is supplied to the
In the switch circuit 11, the sequential running output from the switch circuit 10 is performed.
Audited video signal is selected, otherwise memory
The video signal output from 4 is selected. Video signal output from switch circuit 11
Is a high definition systemVideo signal field formater
ToTo NTSCVideo signal field formater
ToScan lines that perform scan line conversion (down-conversion)
It is supplied to the conversion circuit 12. The scanning line conversion circuit 12
The control signal is supplied from the control signal generation circuit 7 and its operation is performed.
Is controlled. That is, the video signal supplied to the input terminal 1
No. Vin is formed by 2-3 pull-down system
This is an image signal, and the detection signal is sent from the detection circuit 5 to the control signal generation circuit 7.
When the recine cut signal STC is supplied and when the video signal V
The scanning line conversion circuit 1 differs from when in is a normal video signal.
2 are different. When the video signal Vin is a normal video signal
Has a built-in scanning line conversion circuit 12 as described above.
The motion of the image is detected by a motion detection circuit (not shown),
There is still image processing (see FIG. 12) according to the detection result.
Alternatively, a moving image process (see FIG. 13) is performed. On the other hand, if the video signal Vin has a 2-3 pull-down
When it is a telecine video signal formed by the formula, the scanning line
The conversion circuit 12 outputs a video signal which has already been sequentially scanned.
It is supplied (corresponding to the state of B in FIG. 12). So running
The gaze conversion circuit 12 does not detect the motion of the image.
In addition, still image processing (see FIG. 12) is always performed. The scanning line conversion circuit 12 outputs
methodVideo signal field formatFrom NTSC
methodVideo signal field formatScan line conversion
processingThe interlaced scanning video signal Vout is output.
The video signal Vout is output to the output terminal 13. As described above, in this embodiment, the input terminal 1
The supplied video signal Vin is formed by 2-3 pull-down method
If the received telecine video signal is
0, the sequentially-scanned video signal output from
The scanning line conversion circuit 12 supplies the image
Still image processing is always performed without detecting motion.
As a result, the resolution may drop or
Image quality degradation such as this does not occur. In this case, the memories 8, 9 and the switch times
The progressive scan conversion means constituted by the path 10
Progressive scanning method using video signals of odd and even fields
Video signal, so that
However, no image shift occurs due to the scanning line conversion process.
No. In the above embodiment, the signal processing means
Although the example in which the stage is the scanning line conversion circuit 12 has been described, the present invention
Means that the signal processing means is a motion vector detection circuit or discrete cosine
A plurality of scanning line signals such as a conversion circuit (DCT conversion circuit) are used.
Processing (in the field, in the frame, between frames, etc.)
The same applies to other circuits that perform
be able to. For example, if it is a motion vector detection circuit
Can detect motion vectors more finely
Reduced degradation of vertical resolution when using a DCT conversion circuit
Can be In the above embodiment, the detection circuit 5
Is configured using five registers 24-28.
However, by increasing the number of register stages,
Signal "1" is output from the AND gate 31
Can be reduced. In this example, three fields
/ The first field in the frame, that is, telecine
In the period, the fields of No1 and No6Scan lineStrange
Before exchangeScan lineExplained the case of excluding conversion
However, the present invention is not limited to this.
In the third field, the telecine cycle
And the fields of No3 and No8Scan lineBefore conversionRunning
Check lineThe conversion target may be excluded. [0053] As described above, the image according to the present invention is
According to the signal processing circuit,Scans with double the number of scanning lines
Field format of the interlaced video signal
Of interlaced video signals with normal number of scanning lines
When converting to field format, the input signal
Interlaced scanning video signal with double the number of scanning lines
Or a video signal with twice the number of scanning lines
To convert 2 frames of movie film into 5 fields
Field / frame video signal and 2 field / frame video
Formed from 2-3 pull-down method that alternately sends out image signals
Based on the result of determining whether the video signal is
Of video signal to progressive scan conversion means and its readout
Control signal generation circuit for controlling the
The raw circuit determines that the video signal is a telecine video signal.
When the video signal is separated, the video signal
Of these, the signal content of the video signal of 3 fields / frame is
One of the first or third field that is the same
Writing and reading of the progressive scan conversion means so as to delete
Control. With this configuration, 2-3
Telecine video signal formed by theRunning sequentially
Investigation conversion meansWhen supplied, 3 fields / frame
First or third video signal with the same content
One of the fields is deleted before scanline conversion.
Field that has been deleted from this scan line conversion target.
Skip the remaining four fields of the progressive scanning video signal
Two-frame with even and odd fields in cross scan mode
Field format conversion to video signal
it can. Thereby, the same in three fields / frames
The video signal of the content is not subjected to scan line conversion processing
Images such as resolution reduction and image shift due to incorrect motion detection.
Quality deterioration can be avoided. In this case, the progressive scan conversion means
Of odd / even fields formed from the same frame
Forming a progressive scanning video signal from a video signal
so,Frame advance every 3 fields by 2-3 pull down method
One odd field,
One of the two even fields of the same frame
Just interpolate between even fields
OrEven for moving images, image shift may occur
Will not occur.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an embodiment. FIG. 2 is a block diagram showing a detection circuit for a telecine video signal. FIG. 3 is a timing chart showing the operation of the embodiment. FIG. 4 is a timing chart showing the operation of the embodiment. FIG. 5 is a connection diagram showing a generator of a field synchronization signal. FIG. 6 is a timing chart showing the operation of the field synchronization signal generator. FIG. 7 is a connection diagram showing a generator of a write control signal. FIG. 8 is a timing chart showing the operation of a write control signal generator. FIG. 9 is a connection diagram showing a generator of a read control signal. FIG. 10 is a timing chart showing the operation of a read control signal generator. FIG. 11 is a diagram for explaining a 2-3 pull-down scheme. FIG. 12 is a diagram for explaining down-conversion (still image processing). FIG. 13 is a diagram for explaining down-conversion (moving image processing). [Description of Signs] 1 Input terminal 2 Subtractors 3, 4, 8, 9 Field memory 5 Telecine video signal detection circuit 6 Timing generation circuit 7 Control signal generation circuits 10, 11 Switch circuit 12 Scanning line conversion circuit 13 Output terminal

Claims (1)

(57) [Claims 1] The field format of an interlaced scanning video signal having double the number of scanning lines is changed to the field format of an interlaced scanning video signal having a normal number of scanning lines. A video signal processing circuit for conversion, wherein an input signal has a scanning line number twice as large as a normal scanning line.
Video signal or an image with twice the number of scanning lines
Video signals of three fields / frames to convert the second frame into 5 fields was in cinema film an image signal and 2 fields
2-3 pull-down that alternately sends / frame video signal
A signal discriminating means for discriminating whether the video signal is a telecine video signal formed by a system, and a memory in which writing and reading of the video signal are performed, and converting the interlaced scanning video signal into a progressive scanning video signal. And a control signal generating circuit for controlling writing and reading of a video signal to and from the progressive scan conversion means based on a result of the determination by the signal determination means. Is determined to be the telecine video signal, any one of the first or third field having the same signal content in the video signal of 3 fields / frame out of 5 fields continuous in the video signal a control signal generating circuit for controlling writing and reading of the sequential scanning conversion means to delete one, said control signal generating circuit Thus switch circuit controlled
Interlaced scanning method having twice the number of scanning lines as usual
Video signal or converted by the progressive scan conversion means.
To select one of the progressive scanning video signals
A switch circuit and a double scanning line selected by the switch circuit.
Interlaced scanning video signal having a number or
To the progressive scanning video signal converted by the
And a signal processing means for performing scanning line conversion processing for the motion detection circuit is built in the signal processing means, A. The signal processing unit is configured so that the input signal is double the normal scanning line
A video signal having a number, which is not the telecine video signal.
The control signal generation circuit.
Therefore, the interlaced scanning method having twice the number of scanning lines
The switch circuit is controlled to select the video signal of the formula.
Is, i. The image of the video signal input from the switch circuit
The motion detection circuit detects that there is motion in the image.
If the has a number of scanning lines of the conventional multiplying input
And forming an image of an odd field of the video signal having the normal number of scanning lines from the image of the odd field of the video signal of interlaced scanning method, a video signal of an interlaced scanning system having a number of scanning lines of the conventional multiplying input image forming from the even field image of the even field of the video signal having the number of scan lines the normal, ii. The image of the video signal input from the switch circuit
The absence of motion in the image is detected by the motion detection circuit.
If the has a number of scanning lines of the conventional multiplying input
From the interlaced video signal to the normal
An image of one frame of a video signal having double the number of scanning lines is formed, and the normal number of scanning lines of the sequential scanning method is calculated from the image of one frame of the video signal having a double number of scanning lines of the progressive scanning method. an image of one frame of the video signal to form with the image and an even field of an odd field of the video signal having the number of scanning lines from the image of the normal one frame of the video signal of progressive scanning having a number the normal scan lines B. and the image of B. The signal processing unit may be configured to convert the input signal into the telecine image by the signal determination unit.
If the signal is determined to be a signal, the control signal generation circuit
Sequentially read from the sequential scan conversion means by a path
A switch circuit is controlled to select a scanning video signal.
Before being input from the switch circuit
Without detecting the motion of the image of the video signal,
Whether it is a progressive scanning video signal input from the scanning conversion means
Of a video signal of a progressive scanning method having a normal number of scanning lines.
Form a frame image and have the normal number of scanning lines
From the image of one frame of the video signal of the progressive scanning method,
Image of odd field of video signal having normal number of scanning lines
And an image of an even field .