JP2001223983A - Device for converting video signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that movement is not natural and smooth in a video displayed while movement is made to be slow or fast at each frame by a video signal obtained by converting the video with 24 frames per second into that with the of 30 frames per second by sequential scanning. SOLUTION: The plurality of first sequential scanning video signals converted by the number of frames where video materials are different at each frame are stored in a second memory 12. The change-over of the frames applying to the change-over of each frame in the base material of each video signal stored in the memory 12 is extracted. Then the first video successive scanning video signals stored in the memory 12 are selectively extracted by a memory reading circuit 13 and converted into the second successive scanning video signals of a base material frame rate or integer times base material frame rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal converter for transferring various video information such as movie material and video material, such as DVD and satellite broadcast, and sequentially scanning and reproducing the video signal.

[0002]

2. Description of the Related Art Conventionally, video output of DVDs and satellite broadcasts is usually output by interlaced scanning so that it can be reproduced by a television receiver. With the widespread use of such devices, video signal converters for converting these interlaced video signals into progressively scanned video signals are being introduced. In particular, a multi-scan monitor is capable of inputting progressive scanning video signals of various field frequencies, and it is desired to connect to them and to introduce a video signal conversion device aiming at higher image quality.

FIG. 7 is a block diagram showing a configuration of a conventional video signal converter. In FIG. 1, reference numeral 1 denotes a disk on which a video signal obtained by converting a film material video into an electric signal is encoded in a signal form suitable for recording in advance, modulated, and recorded. Reference numeral 2 denotes a pickup, which converts a signal recorded on the disk 1 into an electric signal. Reference numeral 3 denotes a disk rotating device which rotates the disk 1 at a rotation speed suitable for reproduction.
Reference numeral 4 denotes an interlaced scanning video signal reproducing circuit which demodulates and decodes the video signal recorded on the disk 1 and outputs it as an interlaced scanning video signal. Reference numeral 5 denotes an NTSC encoder which converts an interlaced scanning video signal into an NTSC video format and outputs it. Reference numeral 6 denotes an interlaced scanning video signal output terminal from which an interlaced scanning video signal reproduced from this terminal is output.
A repeat timing signal generating circuit 7 generates a field repeat signal (RFF) necessary for the operation of the interlaced scanning video signal reproducing circuit 4 and the sequential scanning video signal converting circuit 9. Reference numeral 8 denotes a first memory, which has a capability of storing a video signal for one field, and a progressive scanning video signal conversion circuit 9.
Used for the operation of Reference numeral 9 denotes a progressive scanning video signal conversion circuit which converts the output of the interlaced scanning video signal reproducing circuit 4 into a progressive scanning video signal and outputs it. Reference numeral 10 denotes a first color difference converter which converts the output of the progressive scanning video signal conversion circuit 9 into a progressive scanning color difference signal and outputs the signal. Reference numeral 11 denotes a first progressive scanning video signal output terminal from which a progressive scanning video signal is output to a video display device (not shown).

[0004] The operation of the conventional video signal converter configured as described above will be further described.

FIG. 8 is a schematic diagram showing the structure of a video signal of a conventional video signal converter. As shown in FIG. 8 a) Material video signal, the video signal recorded on the disc 1 is a video signal using a movie film as a material, and the original material is a film image composed of pictures at 24 frames per second. .., N, n + are compressed on the disc 1 as an image of 720 dots horizontally and 480 dots vertically for each frame.
1, n + 2, n + 3, n + 4,... The pickup 2 converts the thus recorded film material signal into an electric signal, and the interlaced scanning video signal reproducing circuit 4 demodulates the signal, converts the signal into an interlaced scanning image, and outputs the converted signal. This is because television monitors are most often used as image display devices for viewing at home, and the display format is interlaced scanning.
Also, since the television monitor is designed to handle a moving image of 30 frames / 60 fields per second, the interlaced scanning video signal reproducing circuit 4 simultaneously converts an image of 24 frames per second into an interlaced scanning image of 30 frames / 60 fields per second. Convert and output. That is, the repeat timing signal generation circuit 7 of FIG. 7 synchronizes with the two frames of the material video and sets the three-field period of the interlaced scan video signal as indicated by c) the output of the repeat timing generation circuit (RFF) of FIG. A signal that sets "1" and the two-field period to "0" is generated. The interlaced scanning video signal reproducing circuit 4 in FIG. 7 divides each frame of the recording information into two interlaced scanning field images of odd and even as shown in b) interlaced scanning video signal output in FIG. ) By the timing indicated by the output of the repeat timing generation circuit (RFF), the first field is repeatedly displayed after the last field only in the section where this signal is "1", so that a film image of 24 frames per second can be displayed at 30 frames per second. The image is converted into a / 60 field interlaced scanning image and output. The NTSC encoder 5 converts the interlaced scanning video signal reproduced in this manner into an NTSC standard video signal and outputs it to the interlaced scanning video signal output terminal 6. A television monitor (not shown) is connected to the interlaced scanning video signal output terminal 6, so that the user can watch the film material video converted into the interlaced scanning video.

Further, an interlaced scanning video signal reproducing circuit 4
Inputs the interlaced scanning video signal to the progressive scanning video signal conversion circuit 9. The progressive scanning video signal conversion circuit 9 outputs the interlaced scanning video output shown in b) interlaced scanning video signal output in FIG. 8 for each frame according to the timing at which the output (RFF) of the repeat timing generation circuit changes in FIG. After the first field is stored in the first memory 8, the next field is stored in the first memory 8, and the information of both is doubled line by line, and c) a repeat timing generation circuit output (RFF) in FIG. Is "1" three times, c) in FIG.
When the output of the repeat timing generation circuit (RFF) is “0”, the image is read out twice and the video output shown in FIG. The converted video signal is converted into an analog progressive scanning chrominance signal by the first chrominance converter 10 shown in FIG. 7 and output from the first progressive scanning video signal output terminal 11. A television monitor (not shown) for a progressive scanning video signal is connected to the first progressive scanning video signal output terminal 11, so that the user can watch the film material video converted into the progressive scanning video.

FIG. 9 is a schematic diagram showing the movement of a subject on a progressive scanning video signal of a conventional video signal converter.

FIG. 9A) A material video signal represents the movement of a subject on a film as a material on a time axis. That is, n, n + 1, n + 2, n + 3, and n + 4 indicate images of each frame, and indicate a state where a round subject is moving on the screen from left to right at a constant speed.

FIG. 9A) The movement of a material video signal viewed on a progressive scanning video output is the movement of a progressive scanning video information on a monitor shown in FIG. 9B. In the figure, in order to represent a temporal operation, images of each frame of n, n + 1, n + 2, n + 3, and n + 4 are drawn in an overlapping manner. As shown in FIG. 8 d) progressive scan video signal output, n, n + 1, n + 2, n + 3, n
Each +4 frame is 3 on the progressive scanning video signal output.
Since frames are displayed as frames, 2 frames, 3 frames, 2 frames, and 3 frames, the display time for every other frame is different. Therefore, the motion of the subject that is moving at a constant speed is moving while slowing down or speeding up for each frame. In FIG. 9B, a portion having a thick outline of a round subject shown in the movement of the progressive scanning video signal on the monitor indicates a frame displayed in three frames, and a thin portion indicates a frame displayed in two frames. .

[0010]

As described above, in the progressive scan video output of the conventional video signal conversion device, the moving image is displayed while moving slowly or quickly for each frame. This is unnatural and jerky, which is a major drawback for the video signal converter.

In the future, there is a demand for the introduction of a video signal conversion device capable of outputting a progressively scanned image with no jerky motion after the progressive scan conversion.

According to the present invention, after progressive conversion, the frame frequency is further converted so as to be an integral multiple of the frequency of the frame of the original material, so that a progressively scanned image can be output with natural and jerky motion. It is intended to provide a signal conversion device.

[0013]

According to the present invention, there is provided a memory means for storing a plurality of frames of a first progressively scanned video signal obtained by converting a video material into a different number of frames for each frame. Frame extracting means for extracting, from the first progressively scanned video signal stored in the memory means, switching of frames corresponding to switching of each frame of the material, and storing in the memory means in accordance with the output of the frame extracting means. Converting means for selectively extracting the first progressively scanned video signal and converting it to a second progressively scanned video signal having a frame rate of the material or an integral multiple of the frame rate of the material. By equalizing, a video signal conversion device capable of outputting a progressively scanned video which is natural and has no jerking can be obtained.

Further, according to the present invention, the first progressive scanning video signal in which the video material is converted into a different number of frames for each frame, and the switching of each frame of the material in the first progressive scanning video signal correspond to the switching. A field overlap signal indicating a change of a frame to be input, and converting the signal into a progressively scanned video signal having a frame rate different from that of the first progressively scanned video signal. Means for selectively extracting the first progressively scanned video signal stored in the memory means in accordance with the input of the field overlap signal, the frame rate of the material or an integral multiple of the frame rate of the material. Conversion means for converting the image into a second progressively scanned video signal, and by making the display time of each frame equal, the progressive scanning with natural and jerky movement Video signal converting apparatus which can output image is obtained.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a video signal conversion apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a disk on which a video signal obtained by converting a film material video into an electric signal is encoded in a signal form suitable for recording in advance, modulated, and recorded. Reference numeral 2 denotes a pickup, which converts a signal recorded on the disk 1 into an electric signal. Reference numeral 3 denotes a disk rotating device.
Is rotated at a rotation speed suitable for reproduction. Reference numeral 4 denotes an interlaced scanning video signal reproducing circuit which demodulates and decodes the video signal recorded on the disk 1 and outputs it as an interlaced scanning video signal. Reference numeral 5 denotes an NTSC encoder which converts an interlaced scanning video signal into an NTSC video format and outputs it. Reference numeral 6 denotes an interlaced scanning video signal output terminal from which an interlaced scanning video signal reproduced from this terminal is output. A repeat timing signal generating circuit 7 generates a field repeat signal (RFF) necessary for the operation of the interlaced scanning video signal reproducing circuit 4 and the sequential scanning video signal converting circuit 9. Reference numeral 8 denotes a first memory which has a capability of storing video signals for one field, and is used for the operation of the progressive scanning video signal conversion circuit 9. Reference numeral 9 denotes a progressive scanning video signal conversion circuit which converts the output of the interlaced scanning video signal reproducing circuit 4 into a progressive scanning video signal and outputs it. Reference numeral 10 denotes a first color difference converter, and a switch 14
Is sequentially converted to a scanning color difference signal and output. Reference numeral 11 denotes a first progressive scanning video signal output terminal from which a progressive scanning video signal is output to a video display device (not shown). 12
Is a second memory, which stores the output of the progressive scanning video signal conversion circuit 9 and whose frame frequency is converted and read by the memory reading circuit 13. Reference numeral 13 denotes a memory readout circuit which reads out sequentially scanned video signals from the second memory 12. Reference numeral 14 denotes a switch, which is used by a user (not shown).
Is switched between the output of the progressive scanning video signal conversion circuit 9 and the output of the memory readout circuit 13 and output to the first color difference converter 10.

The operation of the video signal conversion device according to the first embodiment of the present invention configured as described above will be further described.

FIG. 2 is a schematic diagram showing a structure of a video signal of the video signal conversion device according to the first embodiment of the present invention. As shown in FIG. 2 a) Material video signal, the video signal recorded on the disc 1 is a video signal using a movie film as a material, and the original material is a film image composed of pictures at 24 frames per second. And 720 dots horizontally and 480 vertically for each frame
.., N, n + 1, n + 2, n + 3, n + 4,...
・ Recorded in the order of The pickup 2 converts the film material signal thus recorded into an electric signal,
The interlaced scanning video signal reproducing circuit 4 demodulates the signal, converts it into an interlaced scanning video, and outputs the converted video. This is because a television monitor is generally most often used as an image display device for viewing at home, and its display format is interlaced scanning. Further, the television monitor has a rate of 30 frames / 60 fields per second. Since it is designed to handle moving images, the interlaced scanning video signal reproducing circuit 4 simultaneously converts 24 frames of video per second into 30 frames / 60 fields of interlaced scanning video and outputs it. That is,
The repeat timing signal generation circuit 7 of FIG. 1 synchronizes three field periods of the interlaced scan video signal with “1” in synchronization with two frames of the material video, as indicated by c) the output of the repeat timing generation circuit (RFF) of FIG. , And a signal that sets the two-field period to “0”. The interlaced scanning video signal reproducing circuit 4 in FIG. 1 divides each frame of the recording information into two interlaced scanning field images, odd and even, as shown in b) interlaced scanning video signal output in FIG.
FIG. 2 c) Repeat timing generation circuit output (RFF)
This signal is set to “1” by the timing indicated by
By repeatedly displaying the first field only after the last field after the last section, a film image of 24 frames per second is converted into an interlaced scan image of 30 frames / 60 fields per second and output. The NTSC encoder 5 converts the interlaced video signal reproduced in this manner into an NTSC signal.
A standard video signal is output to the interlaced scanning video signal output terminal 6. A television monitor (not shown) is connected to the interlaced scanning video signal output terminal 6, so that the user can watch the film material video converted into the interlaced scanning video.

Further, an interlaced scanning video signal reproducing circuit 4
Inputs the interlaced scanning video signal to the progressive scanning video signal conversion circuit 9. The progressive scanning video signal conversion circuit 9 outputs the interlaced scanning video output shown in b) interlaced scanning video signal output of FIG. 2 for each frame according to the timing at which the output (RFF) of the repeat timing generating circuit in FIG. After the first field is stored in the first memory 8, the next field is stored in the first memory 8, and the information of both is doubled line by line, and c) a repeat timing generator circuit output (RFF) in FIG. 3 if “1” is “1”, c) in FIG.
When the output of the repeat timing generation circuit (RFF) is "0", reading is performed twice, thereby obtaining the video output shown in d) the progressive scanning video signal output of FIG. Further, the progressive scanning video signal conversion circuit 9 outputs the progressive scanning video signal to the switch 14 and the second memory 12. The second memory 12 can store one frame of the progressive scanning video signal in synchronization with the output of the progressive scanning video signal conversion circuit 9.
It can be read out in synchronization with the memory readout circuit 13. The second memory 12 stores only the frame next to the frame in which the change in the output (RFF) of the repeat timing generation circuit in FIG. 2 c occurs, and the memory readout circuit 13 is stored in the second memory 12. If the progressive scanning video signal is read at three times the speed of the material video signal, the output of the memory reading circuit 13 will be e) 3 in FIG.
As shown in the output of the double sequential scanning video signal. The output of the memory read circuit 13 is output to the switch 14. The switch 14 switches between the progressive scanning video signal and the triple progressive scanning video signal, is converted into an analog progressive scanning color difference signal by the first color difference converter 10, and is output from the first progressive scanning video signal output terminal 11. You. A television monitor (not shown) for a progressive scanning video signal is connected to the first progressive scanning video signal output terminal 11 so that the user can view the film material video returned to the progressive scanning video. The switch 14 is set by the user, whereby the video signal output from the first progressive scanning video signal output terminal 11 can be switched between a progressive scanning video signal and a triple progressive scanning video signal.

The material of the 3 × progressively scanned video signal is 24
Frame, 72 frames per second, 720 horizontal
This is a video signal that displays 480 dots vertically and 480 dots vertically, and the progressively scanned video signal is 60 frames per second.
It becomes a video signal having a high scanning frequency.

FIG. 3 is a schematic diagram showing the movement of a subject on a progressive scanning video signal of the video signal conversion device according to the first embodiment of the present invention.

FIG. 3A) A material video signal represents a movement of a subject on a film as a material on a time axis. That is, n, n + 1, n + 2, n + 3, and n + 4 indicate images of each frame, and indicate a state where a round subject is moving on the screen from left to right at a constant speed.

FIG. 3A) Movement of the material video signal viewed on the progressive scan video output is FIG. 3B) Movement of the progressive scan video signal on the monitor. In the figure, in order to represent a temporal operation, images of each frame of n, n + 1, n + 2, n + 3, and n + 4 are drawn in an overlapping manner. As shown in FIG. 2d) progressive scan video signal output, n, n + 1, n + 2, n + 3, n
Each +4 frame is 3 on the progressive scanning video signal output.
Since frames are displayed as 2 frames, 3 frames, 2 frames, and 3 frames, the display time in one frame differs. Therefore, the movement of the subject, which is originally moving at a constant speed, moves while slowing down or speeding up for each frame. In FIG. 3B, a portion having a thick outline of a round subject, which is indicated by the movement of the progressive scanning video information on a monitor, indicates a frame displayed in three frames, and a thin portion indicates a frame displayed in two frames. . FIG. 3C shows the movement of the triple-times progressively scanned video information on the monitor. In the figure, n, n + 1, n + 2, n + 3, n +
4 are superimposed on each other. As shown in FIG. 2 e) 3 × progressive scan video signal output, each frame of n, n + 1, n + 2, n + 3, n + 4 has three frames on the progressive scan video signal output. The time for each frame to be displayed is the same. Therefore, the movement of the subject which is originally moving at a constant speed moves at the same speed for each frame. As shown in FIG. 3C) Movement of the 3 × progressively scanned video information signal on the monitor, the round object moves at a constant speed on the monitor.

Therefore, the video signal conversion device according to the first embodiment of the present invention has a conversion means for converting into a second progressively scanned video signal three times the frame rate of the material, thereby reducing the display time of each frame. By making them equal, a video signal conversion device capable of outputting a progressively scanned video that is natural and has no jerking can be obtained.

(Embodiment 2) FIG. 4 is a block diagram showing a configuration of a video signal conversion apparatus according to Embodiment 2 of the present invention. In FIG. 1, reference numeral 1 denotes a disk on which a video signal obtained by converting a film material video into an electric signal is encoded in a signal form suitable for recording in advance, modulated, and recorded. Reference numeral 2 denotes a pickup, which converts a signal recorded on the disk 1 into an electric signal. Reference numeral 3 denotes a disk rotating device.
Is rotated at a rotation speed suitable for reproduction. Reference numeral 4 denotes an interlaced scanning video signal reproducing circuit which demodulates and decodes the video signal recorded on the disk 1 and outputs it as an interlaced scanning video signal. Reference numeral 5 denotes an NTSC encoder which converts an interlaced scanning video signal into an NTSC video format and outputs it. Reference numeral 6 denotes an interlaced scanning video signal output terminal from which an interlaced scanning video signal reproduced from this terminal is output. A repeat timing signal generating circuit 7 generates a field repeat signal (RFF) necessary for the operation of the interlaced scanning video signal reproducing circuit 4 and the sequential scanning video signal converting circuit 9. Reference numeral 8 denotes a first memory which has a capability of storing video signals for one field, and is used for the operation of the progressive scanning video signal conversion circuit 9. Reference numeral 9 denotes a progressive scanning video signal conversion circuit which converts the output of the interlaced scanning video signal reproducing circuit 4 into a progressive scanning video signal and outputs it. Reference numeral 10 denotes a first color difference converter which converts the output of the progressive scanning video signal conversion circuit 9 into a progressive scanning color difference signal and outputs the signal. Reference numeral 11 denotes a first progressive scanning video signal output terminal from which a progressive scanning video signal is output to a video display device (not shown). The above is the same as the video signal conversion device described in the related art.

Reference numeral 15 denotes a progressive scanning video signal input terminal, from which a progressive scanning video signal is input. Reference numeral 16 denotes an AD converter which converts a progressive scanning video signal input from the progressive scanning video signal input terminal 15 into a digital signal. 20 is a third memory for storing the output of the AD converter 16;
The frame frequency is converted and read by the memory read circuit 13. Reference numeral 17 denotes a repeat field detection circuit, which detects a break between frames in the sequential video signal stored in the third memory 20. Reference numeral 18 denotes a second color difference converter which converts the output of the memory readout circuit 13 into a sequentially scanned color difference signal and outputs the signal. 19 is the second
, From which a progressively scanned video signal is output to a video display device (not shown).

The operation of the video signal conversion device according to the second embodiment of the present invention configured as described above will be further described.

FIG. 5 is a schematic diagram showing the structure of a video signal of the video signal conversion device according to the second embodiment of the present invention. As shown in FIG. 5A) material video signal, the video signal recorded on the disc 1 is a video signal using a movie film as a material, and the original material is a film image composed of pictures at 24 frames per second. And 720 dots horizontally and 480 vertically for each frame
.., N, n + 1, n + 2, n + 3, n + 4,...
・ Recorded in the order of The pickup 2 converts the film material signal thus recorded into an electric signal,
The interlaced scanning video signal reproducing circuit 4 demodulates the signal, converts it into an interlaced scanning video, and outputs the converted video. This is because a television monitor is generally most often used as an image display device for viewing at home, and its display format is interlaced scanning. Further, the television monitor has a rate of 30 frames / 60 fields per second. Since it is designed to handle moving images, the interlaced scanning video signal reproducing circuit 4 simultaneously converts 24 frames of video per second into 30 frames / 60 fields of interlaced scanning video and outputs it.

That is, the repeat timing signal generation circuit 7 shown in FIG. 4 synchronizes with two frames of the material video and outputs the 3rd of the interlaced scan video signal as shown by c) the output of the repeat timing generation circuit (RFF) in FIG. A signal for setting the field period to “1” and the two field periods to “0” is generated. The interlaced scanning video signal reproducing circuit 4 in FIG. 4 divides each frame of the recording information into two interlaced scanning field images, odd and even, as shown in b) interlaced scanning video signal output in FIG. ) By the timing indicated by the output of the repeat timing generation circuit (RFF), the first field is repeatedly displayed after the last field only in the section where this signal is "1", so that a film image of 24 frames per second can be displayed at 30 frames per second. The image is converted into a / 60 field interlaced scanning image and output. The NTSC encoder 5 converts the interlaced scanning video signal reproduced in this manner into an NTSC standard video signal and outputs it to the interlaced scanning video signal output terminal 6. A television monitor (not shown) is connected to the interlaced scanning video signal output terminal 6, so that the user can watch the film material video converted into the interlaced scanning video.

Further, an interlaced scanning video signal reproducing circuit 4
Inputs the interlaced scanning video signal to the progressive scanning video signal conversion circuit 9. The progressive scanning video signal conversion circuit 9 outputs the interlaced scanning video output shown in b) interlaced scanning video signal output of FIG. 5 for each frame according to the timing at which the output (RFF) of the repeat timing generating circuit in FIG. After the first field is stored in the first memory 8, the next field is stored in the first memory 8, and the information of both is doubled line by line, and c) a repeat timing generation circuit output (RFF) in FIG. Is "1" three times, c) in FIG.
When the output of the repeat timing generation circuit (RFF) is "0", reading is performed twice, thereby obtaining the video output shown in d) the progressive scanning video signal output in FIG. The output of the progressive scanning video signal conversion circuit 9 is converted into an analog progressive scanning color difference signal by a first color difference converter 10 and output from a first progressive scanning video signal output terminal 11. A television monitor (not shown) for a progressive scanning video signal is connected to the first progressive scanning video signal output terminal 11, so that the user can view the film material video returned to the progressive scanning video. .

Further, a first progressive scanning video signal output terminal 1
1 is input to the progressive scanning video signal input terminal 15. The input of the progressive scanning video signal input terminal 15 is converted by an AD converter 16 into a digital color difference progressive scanning video signal. The third memory 20 stores the input of the AD converter 16. The repeat field detection circuit 17 compares the video signals of two consecutive frames of the progressively scanned video signals stored in the third memory. Since the output of the progressive scanning video signal in FIG. 5D is stored in the third memory 20 as it is, the output of the repeat field detection circuit 17 is as shown in FIG. Here, the output is “1” if the video signals of two consecutive fields match, and becomes “0” if the video signals of two consecutive fields do not match. The f) field in FIG. 5 where the repeat field detection output is "0" is the timing at which the image information of the original progressively scanned video signal changes, and this directly indicates a frame break in the original material video. The third memory 20 can read out the stored progressively scanned video signal by the memory readout circuit 13. The memory readout circuit 13 selects the progressive scan video signal stored in the third memory 20 from (f) in FIG.
If only the field in which the repeat field detection output is "0" is read back at three times the speed of the material video signal, the output of the memory read circuit 13 becomes as shown in FIG. . Memory readout circuit 1
The output of No. 3 is converted into an analog progressive scanning color difference signal by a second color difference converter 18 and output from a second progressive scanning video signal output terminal 19. A TV monitor (not shown) for a progressive scanning video signal is connected to the second progressive scanning video signal output terminal 19, so that the user can watch the film material video converted into the triple progressive scanning video signal. Can do things.

The 3 × progressively scanned video signal has a material of 24 times per second.
Frame, 72 frames per second, 720 horizontal
This is a video signal that displays 480 dots vertically and 480 dots vertically, and the progressively scanned video signal is 60 frames per second.
It becomes a video signal having a high scanning frequency.

FIG. 6 is a schematic diagram showing a subject movement on a progressively scanned video signal of the video signal conversion device according to the second embodiment of the present invention.

FIG. 6A) A material video signal represents the movement of a subject on a film as a material on a time axis. That is, n, n + 1, n + 2, n + 3, and n + 4 indicate images of each frame, and indicate a state where a round subject is moving on the screen from left to right at a constant speed.

FIG. 6A shows the movement of the material video signal on the progressive scan video output, and FIG. 6B shows the motion of the progressive scan video signal on the monitor. In the figure, in order to represent a temporal operation, images of each frame of n, n + 1, n + 2, n + 3, and n + 4 are drawn in an overlapping manner. As shown in FIG. 5 d) progressive scan video signal output, n, n + 1, n + 2, n + 3, n
Each +4 frame is 3 on the progressive scanning video signal output.
Since frames are displayed as 2 frames, 3 frames, 2 frames, and 3 frames, the display time in one frame differs. Therefore, the movement of the subject, which is originally moving at a constant speed, moves while slowing down or speeding up for each frame. In FIG. 6B, the portion of the round subject having a thick outline shown in the movement of the progressive scanning video information on the monitor indicates a frame displayed in three frames, and the thin portion indicates a frame displayed in two frames. . FIG. 6C) shows the movement of the triple-fold progressively scanned video information on the monitor. In the figure, n, n + 1, n + 2, n + 3, n +
4 are superimposed on each other. As shown in FIG. 5 e) 3 × progressive scanning video signal output, each frame of n, n + 1, n + 2, n + 3, n + 4 has three frames on the progressive scanning video signal output. The time for each frame to be displayed is the same. Therefore, the movement of the subject which is originally moving at a constant speed moves at the same speed for each frame. As shown in FIG. 6C) Movement of the 3 × progressively scanned video information signal on the monitor, the round object moves at a constant speed on the monitor.

As described above, in the video signal conversion device according to the second embodiment of the present invention, the second
By providing a conversion means for converting to a progressive scanning video signal, the display time of each frame is made equal, whereby a video signal conversion device capable of outputting a progressive scanning video which is natural and has no jerking motion is obtained.

In the first and second embodiments of the present invention, the first memory, the second memory,
The memories are separately configured, but this is for the sake of explanation of the operation, for the sake of simplicity. The first memory and the second memory, and the first memory and the third memory are the same memory circuit. It is also possible to share with.

In the first and second embodiments of the present invention, the output is set to a frame frequency three times as high as that of the film material. Good.

Further, in the description of the first and second embodiments of the present invention, particularly in the description of FIGS. 1 and 4, a description of a circuit block is made. It is also possible to realize by software replacing the processor. In the first and second embodiments of the present invention, the output and input of the video signal are all analog signals, but they may be digital signals.

Further, in both embodiments, the source of the video signal is constituted by a so-called disk device. However, this is achieved by using another video signal device, for example, a tape device such as D-VHS, a terrestrial wave, a BS / CS. TV broadcast or cable T
The present invention can be similarly applied to a broadcast receiver such as a V broadcast.

[0041]

As described above, according to the present invention, the memory means for storing a plurality of frames of the first progressively scanned video signal obtained by converting the video material into a different number of frames for each frame, and the memory means A frame extracting means for extracting a change of a frame corresponding to a change of each frame of the material of the stored first progressive scan video signal, and a first progressive scan stored in a memory means according to an output of the frame extract means By providing a conversion means for selectively extracting a video signal and converting it into a second progressively scanned video signal of a material frame rate or an integral multiple of the material frame rate, the display time of each frame is made equal, A video signal converter capable of outputting a progressively scanned video with no jerky motion is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a video signal conversion device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a structure of a video signal of the video signal conversion device.

FIG. 3 is a schematic diagram showing a subject movement on a progressive scanning video signal of the video signal conversion device.

FIG. 4 is a block diagram showing a configuration of a video signal conversion device according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing a structure of a video signal of the video signal converter.

FIG. 6 is a schematic diagram showing a subject movement on a progressive scanning video signal of the video signal conversion device.

FIG. 7 is a block diagram showing a configuration of a conventional video signal conversion device.

FIG. 8 is a schematic diagram showing a structure of a video signal of the video signal converter.

FIG. 9 is a schematic diagram showing a subject movement on a progressively scanned video signal of the video signal conversion device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 disc 2 pickup 3 disc rotating device 4 interlaced scanning video signal reproducing circuit 5 NTSC encoder 6 interlaced scanning video signal output terminal 7 repeat timing signal generating circuit 8 first memory 9 progressive scanning video signal conversion circuit 10 first color difference converter 11 First progressive scan video signal output terminal 12 Second memory 13 Memory readout circuit 14 Switch 15 Progressive scan video signal input terminal 16 AD converter 17 Repeat field detection circuit 18 Second color difference converter 19 Second progressive scan video signal output Terminal 20 Third memory

Claims (4)

[Claims] 1. A memory means for storing a plurality of frames of a first progressively scanned video signal obtained by converting a video material into a different number of frames for each frame, and said first progressively scanned video signal stored in said memory means. Frame extracting means for extracting a change of a frame corresponding to a change of each frame of the material from a signal, and selecting the first progressively scanned video signal stored in the memory means according to an output of the frame extracting means A video signal conversion device for converting the video signal into a second progressively-scanned video signal that is extracted in a predetermined manner and is a frame rate of the material or an integral multiple of the frame rate of the material. 2. The method according to claim 1, wherein the frame extracting unit is configured to store the first frame in the memory unit based on a difference between first successively scanned video signals of two consecutive frames stored in the memory unit.
2. The video signal conversion device according to claim 1, wherein the switching of frames corresponding to the switching of each frame of the material of the progressive scanning video signal is extracted. 3. A first progressive scan video signal in which a video material is converted into a different number of frames for each frame, and a first progressive scan video signal of a frame corresponding to switching of each frame of the material in the first progressive scan video signal. A video signal conversion device which inputs a field overlap signal indicating switching and converts the input signal into a progressively scanned video signal having a frame rate different from that of the first progressively scanned video signal. A memory means for storing a plurality of frames, and selectively extracting the first progressively scanned video signal stored in the memory means in response to the input of the field overlap signal, the frame rate of the material or the frame rate of the material. A conversion means for converting the signal into a second progressively scanned video signal of an integral multiple. 4. The video material is a movie film having a frame frequency of 24 frames per second, the frame frequency of the first progressively scanned video signal is 60 frames per second, and the frame frequency of the second progressively scanned video signal is 24 frames per second. 4. The video signal conversion device according to claim 1, wherein the number of frames is × m frames (where m = 1, 2, 3,...).