JPH10322621A - Video reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video reproducing device which eliminates malfunction by which a moving image flickers, performs display that is close to an original film video and improves a display quality at the time of creating film video that makes a motion picture material from a record medium. SOLUTION: When a recording medium (e.g. a DVD software) on which a film video signal that is different from a standard television mode is reproduced, the film video signal is first reproduced by a decode circuit 3, then converted into a video signal of the standard television mode by making it pass through a 32 pull-down conversion circuit 5 and is shown on a standard mode television receiver 7. On the other hand, the original film video signal before 32 pull-down conversion is shown on a liquid crystal display device 9 as it is in a synchronous form. Thereby, film video of twenty-four frames is converted into thirty frames and shown on a standard mode television receiver and also a film video signal of the twenty-four frames is shown as it is in a high image quality on the device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus capable of displaying a film image generated from a recording medium or the like with high image quality without causing a problem such as rattling when displaying a moving image.

[0002]

2. Description of the Related Art Conventionally, when an image created for a movie is broadcast by television broadcasting, an image recorded on a film of the movie is converted into an NT (standard television) system.
A telecine converter for converting to an SC signal is used. In a telecine conversion device, an image photographed on a film is electronically scanned and converted into an image signal.

In a movie, an image of 24 frames (frames) is taken every second. On the other hand, the NTSC signal is composed of 30 frames per second, and one frame is composed of two fields. Therefore, in telecine conversion, an image of 24 frames is converted to 30
It must be converted to a frame image. That is, an NTSC signal of 5 frames (10 fields) is created by 4 frames. Such a system converter is disclosed in
-107375.

[0004] In recent years, an optical disk system for recording and reproducing a high quality image signal mainly on a video signal such as a movie has been developed using a DVD (Digital).
Video Disk) standard.

The optical disk system was deeply involved in the standardization of the movie industry in the United States, and has been devised so that the image of a movie film can be viewed with a high quality on a normal television receiver. ing.

[0006] The optical disk basically has an MPEG (Moving
Picture Experts Group) recorded video signals, but movie-based material was recorded at 2 per second.
It is a sequential signal of four frames.

When an NTSC video signal is output from this optical disk, 24 bits per second from the MPEG decoding circuit is output.
A frame sequential signal is output, 4 frames are increased to 5 frames, and a conversion device for converting to interlaced scanning is used to obtain 30 frames of interlaced scanning signals per second. Hereinafter, this function will be referred to as 32 pull-down conversion.

For example, in a DVD player for NTSC, a video signal read from an optical disk is converted into a video signal and output. First, a signal from the optical disk is read by a pickup, converted into an electric signal, and decoded by a decoding circuit. After performing MPEG decoding and error correction to obtain a sequential signal of 24 frames per second, the signal is converted into a 30-frame interlaced scanning signal by a 32 pull-down conversion circuit, and further D / A converted through a video output circuit to obtain a video signal. As an output to an NTSC television receiver.

The reason for configuring a DVD player having a 32 pull-down conversion circuit as described above is as follows. If the video of 24 frames per second is directly output to the television receiver, the 32 pull-down conversion circuit is unnecessary,
Television receivers compatible with the 24-frame synchronous mode are not widely used, and multi-scan type television receivers compatible with both the 24-frame and the NTSC synchronous mode of 30 frames have a synchronous deflection circuit. Because it is complicated and expensive, the DVD player is provided with a built-in 32 pull-down conversion circuit,
A frame interlaced scanning signal is output.

The operation of the 32 pulldown conversion will be described with reference to FIG. First, the first frame (○) is decomposed into a first odd field, a first even field, and a second odd field, and output by interlacing three times.

Next, the second frame (△) is output by interlacing twice in the order of the second even field and the third odd field.

Next, from the third frame (□) to the third
An even field, a fourth odd field, and a fourth even field are output in this order.

Finally, the fifth odd field and the fifth even field are output in order from the fourth frame (▽).

By these conversions, four frames to five frames (10 fields) are output.

By the way, when the above 32 pull-down conversion is used, 4 frames to 5 frames (10 fields)
When creating an original image, there are a case where one frame of the original image is divided into interlaced scans and output in two fields, and a case where one frame of the original image is output three times in the first, second, and third fields. However, these two timings occur alternately.

Therefore, if there is a moving image that changes at regular intervals in time, the conversion from one frame to two fields and the conversion from one frame to three fields occur. They are not equally spaced in time. For this reason, when a moving image that is moving smoothly, for example, when a car runs or a person moves, rattling (the movement is jerky and lacks smoothness) occurs, and there is a problem that the display quality deteriorates. Was.

[0017]

As described above, when the 32 pull-down conversion is used, there is a problem that a moving image lacks smoothness and the image quality deteriorates.

In view of the above problems, the present invention eliminates the problem of looseness in moving images when generating a film image using a movie as a material from a recording medium or the like, and enables display close to the original film image. It is an object of the present invention to provide a video reproducing apparatus capable of improving display quality.

[0019]

A video reproducing apparatus according to the present invention comprises: a video generating means for reproducing a video signal whose synchronization mode is different from that of a standard television system; and a video for reproducing a video signal from the video generating means. A signal reproducing unit, a scanning frequency converting unit that converts a scanning frequency of a video signal from the video signal reproducing unit so as to conform to a synchronous mode of a standard television system, and generates a standard television system video signal; The apparatus comprises a flat display device arranged in a matrix in a matrix, and a flat display driving means for supplying a video signal from the video signal reproducing means to the flat display device.

According to this configuration, when a film image signal different from the standard television system is reproduced from an image generation means such as a recording medium (for example, an optical disk), 32.
Scan frequency conversion means such as pull-down conversion is provided to convert the video signal into a standard television video signal and output it so that it can be displayed on a standard television receiver or the like. A film video signal can be displayed on a flat display device such as a liquid crystal display in a synchronized form as it is. As a result, the film image can be converted to a scanning frequency and displayed on a standard television receiver, while the signal of the film image is directly provided to a flat display device provided in advance without performing a scanning frequency conversion such as a 32 pull-down conversion. Since the moving image can be displayed, the moving image can be displayed in a smooth motion faithful to the original video.

Further, according to the video reproducing apparatus of the present invention, a video generating means for generating a film video signal whose synchronization mode is different from that of the standard television system, and a first video signal for reproducing the film video signal from the video generating means. A video signal reproducing unit, a flat display device in which pixels are arranged in a matrix in a matrix, and a flat display driving unit for supplying a video signal from the first video signal reproducing unit to the flat display device. Second video signal reproducing means for inputting and reproducing a video signal of a television system, and switching and supplying a signal from a flat display driving means or a signal from the second video signal reproducing means to the flat display device. Switching means.

According to this configuration, the signal of the film image can be displayed as it is on the previously provided flat display device without performing the scanning frequency conversion such as the 32 pull-down conversion, so that the moving image can be smoothly converted to the original image. In addition to this, it is possible to display a video signal of a standard television system input from the outside on the flat display device in a synchronized form.

[0023]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a video reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, a video reproducing apparatus 1 is, for example, D
In a VD player, a pickup 2 reads a film video signal from a recording medium such as an optical disk (not shown), converts the signal into an electric signal, and outputs the electric signal to a decoding circuit 3 at the next stage. The recording medium and the pickup 2 constitute an image generating means for generating an image signal.

Decoding circuit 3 as video signal reproducing means
Is a MPE for the signal read by the pickup 2.
The RGB signals are reproduced by decoding G and correcting errors. The decoding circuit 3 performs operations such as decoding and error correction using the memory 4. The video signal reproduced by the decoding circuit 3 is supplied to a 32
The pull-down conversion circuit 5 converts a sequential signal of 24 frames per second into an interlaced scanning signal of 30 frames. The converted signal from the 32-pull-down conversion circuit 5 is D / A-converted by the video output circuit 6 and output to the standard television receiver 7 as a standard video signal. As the television receiver 7 of the standard system, a standard system (for example, NTSC)
Display device, and a cathode ray tube (C
(RT) or a liquid crystal display.

On the other hand, the video signal reproduced by the decoding circuit 3 in the preceding stage of the 32 pull-down conversion circuit 5 is supplied to a liquid crystal interface (I / F) circuit 8 as a flat display driving means, which drives a liquid crystal display device 9. For example, level conversion for AC power conversion and polarity switching driving for AC driving are performed. In a liquid crystal display device 9 as a flat display device, pixel electrodes are arranged in a matrix in the vertical and horizontal directions, and RGB signals from a liquid crystal I / F circuit 8 are
The image is driven and displayed using a clock signal synchronized with the film image from the clock generator 10.

The clock generator 10, which is the first clock generator, generates a clock signal suitable for the synchronizing form of the film video, supplies the clock signal to the clock input terminal of the decoding circuit 3, and the second signal of the switch circuit 15. Switch SW
2 input terminal a. As a result, the decoding circuit 3 and the liquid crystal display device 9 perform signal processing and liquid crystal driving based on the common operation clock from the clock generator 10.

The switch circuit 15 includes a first switch SW1 as first switching means and a second switch SW2 as second switching means. The first switch SW1 receives an input terminal a for inputting an RGB signal from the liquid crystal I / F circuit 8 and an RGB signal from a video / chroma / RGB matrix circuit 13 which will be described later, which is a second video signal reproducing means. Input terminals b and their input terminals a,
b, and an output terminal c for outputting an RGB signal from one of the terminals b and supplying the signal to a signal input terminal of the liquid crystal display device 9. The second switch SW2 has an input terminal a to which a clock from the clock generator 10 as the first clock generator is input, and an input to which a clock from a PLL circuit 12 to be described later as the second clock generator is input. Edge b
And an output terminal c for outputting a clock from one of the input terminals a and b and supplying the clock to the clock input terminal of the liquid crystal display device 9. Switch circuit 15
, The first and second switches SW1, SW2
When a film image is reproduced from an optical disk based on a control signal from a control unit such as a microcomputer (not shown), the switches SW1 and SW2 are simultaneously switched to the respective input terminals a and a, and the external input is controlled. When reproducing a video signal, the switches SW1 and SW2 are simultaneously switched to the respective input terminals b and b.

A video input terminal 11 is a terminal for inputting a video signal of a standard system (for example, NTSC system) from an external video device such as a video camera. The video signal input externally is supplied to a video / chroma / RGB matrix circuit 13. On the other hand, it is supplied to the synchronization separation circuit 14. A video / chroma / RGB matrix circuit 13 as a second video signal reproducing means decodes an externally input video signal and outputs
A GB signal is generated and supplied to the input terminal b of the first switch SW1 of the switch circuit 15. The sync separation circuit 14 separates a sync signal from the external video signal and outputs the sync signal to the PLL circuit 12, which is a second clock generating means. PLL circuit 1
2 generates a clock from the external synchronization signal from the synchronization separation circuit 14 and supplies the clock to the input terminal b of the second switch SW2 of the switch circuit 15.

Next, the case of reproducing and displaying an optical disk (DVD software) on which a film image of a movie is recorded will be described.

A signal read from an optical disk (not shown) by the pickup 2 is decoded by an MPEG
And a 32-pull down conversion circuit 5 converts a sequential signal of 24 frames per second into an interlaced scanning signal of 30 frames, and further outputs a video output circuit 6
Is converted into a video signal and output as a video signal, and is connected to the outside of the apparatus 1 in a standard system (for example, NTSC system).
Can be displayed on the television receiver 7.

Here, each switch S of the switch circuit 15
Assuming that W1 and SW2 are respectively connected to the input terminal a side, the signal read from the optical disk by the pickup 2 is taken out by the decoding circuit 3 as a sequential signal of 24 frames per second, and then the liquid crystal I / F circuit 8 The AC drive is performed with the polarity switching suitable for writing on the liquid crystal panel at, and the signals are written to the liquid crystal display device 9 as a sequential signal of 24 frames. Since the operation clock of the liquid crystal display device 9 and the operation clock of the decode circuit 3 are made common, the liquid crystal display device 9 can perform accurate and sharp display without jitter and dropout of dots.

When an external video signal is input from a VTR, TV tuner or the like, each switch SW1 of the switch circuit 15
, SW2 are switched to the input terminal b side. An externally input video signal is input to a video chroma / RGB matrix circuit 13, where it is decoded and converted into an RGB signal. The output RGB signals are input to the liquid crystal display device 9. The externally input video signal is also input to a sync separation circuit 14, where a horizontal sync pulse is extracted and supplied to a PLL circuit 12. The PLL circuit 12 oscillates a clock having a frequency that is an integral multiple (for example, 910 times) of the horizontal synchronization pulse and supplies the clock to the liquid crystal display device 9 as an operation clock. As a result, an externally input video signal can be displayed on the liquid crystal display device 9.

According to the above configuration, in order to display the image of 24 frames per second stored on the optical disk on the liquid crystal display device 9 without performing the process of increasing the number of frames, the image is converted to the NTSC system by the 32 pull down conversion and displayed. As described above, a smooth display can be achieved without causing a problem such as a panning operation of a camera which causes rattling when displaying a moving image, and the image quality is greatly improved.

Also, since the liquid crystal display has a memory effect, the matrix display retains and displays the image one field before, and is not suitable for interlaced display, and is suitable for sequential scanning. The mode of the present invention in which the output from the decoding circuit 3 is used as it is for liquid crystal display is most rational, and the display quality is improved.

As described above, the DVD software can be displayed smoothly without rattling, and a video signal in a normal NTSC format or the like can be displayed. The vertical frequency is 24 Hz in the display of DVD software and the vertical frequency is 30 Hz in the case of external video input. However, in the embodiment of the present invention, it can be dealt with only by switching the frequency of the operation clock for driving the driver of the liquid crystal panel. A complicated circuit configuration and operation such as switching between two high-voltage deflection circuits are not required, and cost can be reduced.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 1, 32 television receivers of the NTSC system are connected so that they can be displayed.
Although the configuration in which the pull-down conversion circuit 5 and the video output circuit 6 are incorporated has been described, in FIG. 2, these circuits 5 and 6 are deleted, and only the liquid crystal display device 9 is used, so that a smooth display without rattling can be performed. It is like that. This simplifies the configuration and can further reduce the cost as a video playback device.

In the above-described embodiment, a case has been described in which the image generating means including the recording medium such as an optical disk and the pickup 2 is targeted and the optical disk or the like on which the film image is recorded is reproduced and displayed. The present invention is not limited to the case where a video signal obtained from such a recording medium is reproduced and displayed, and the present invention is applicable to a video reproducing apparatus which receives and displays a film video when it is transmitted as a television broadcast signal by radio waves. Can also be applied. In this case, if the recording medium and the pickup 2 in FIG. 1 or FIG. 2 are replaced with receiving means including an antenna and a tuning circuit, a circuit configuration similar to that in FIG. 1 or FIG. 2 is obtained. That is, the configuration after the decoding circuit 3 in the subsequent stage of the video generating means is the same as that in FIG. 1 or FIG.

Further, in the above-described embodiment, a case has been described in which a moving image is smoothly displayed without rattling using a liquid crystal display device as a display device. However, the present invention is not limited to a liquid crystal display as a display device. It can be widely applied to flat display devices in which pixels are arranged in a matrix, such as liquid crystal displays and plasma displays.

[0040]

As described above, according to the present invention, when a film image using a movie as a material is reproduced by an image generating means such as a recording medium, the problem of rattling of a moving image is eliminated, and the original image is eliminated. Since a display close to a film image can be performed, the display quality at the time of reproducing the film image can be remarkably improved. Further, since a scanning frequency conversion means such as a 32 pull-down conversion circuit can be omitted, the cost of a video reproducing apparatus such as a DVD player can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a video reproducing apparatus according to another embodiment of the present invention.

FIG. 3 is a diagram illustrating 32-pull-down conversion.

[Explanation of symbols]

3 ... decoding circuit, 5 ... 32 pull-down conversion circuit, 6 ...
Video output circuit, 7 ... Standard television receiver,
8 liquid crystal I / F circuit, 9 liquid crystal display device, 10
... Clock generator, 11 ... External video input terminal, 12
... PLL circuit, 13 ... video / chroma / RGB matrix circuit, 14 ... sync separation circuit.

Claims (6)

[Claims] 1. A video signal generating means for generating a video signal whose synchronization mode is different from that of a standard television system, a video signal reproducing means for reproducing a video signal from the video generating unit, and a synchronous mode of a standard television system. A scanning frequency converting means for converting a scanning frequency of a video signal from the video signal reproducing means to generate a video signal of a standard television system, and a flat display device in which pixels are arranged vertically and horizontally in a matrix, A video display device comprising: a flat display drive unit that supplies a video signal from the video signal reproduction unit to the flat display device. 2. The image signal from the image generation means is a film image signal of progressive scanning of about 24 frames per second, and the scanning frequency converting means is a skip scanning signal of 30 frames per second from the sequential signal of about 24 frames per second. 2. The video reproducing apparatus according to claim 1, wherein the video reproducing apparatus is a means for creating a video. 3. The video reproducing apparatus according to claim 1, wherein a synchronization form of the standard television system is an NTSC system. 4. The apparatus according to claim 1, further comprising clock generation means for generating an operation clock commonly used by said video signal reproduction means and said flat display device.
4. The video reproduction device according to any one of Items 3 to 3. 5. A video generating means for generating a film video signal whose synchronization mode is different from that of the standard television system; a first video signal reproducing means for reproducing a film video signal from the video generating means; A flat display device arranged in a matrix, a flat display driving means for supplying a video signal from the first video signal reproducing means to the flat display device, and a standard television video signal input from the outside. A second video signal reproducing means for reproducing; and a switching means for switching and supplying a signal from the flat display driving means or a signal from the second video signal reproducing means to the flat display device. Video playback device. 6. A first clock generating means for generating a first operation clock commonly used for the first video signal reproducing means and the flat display device, and a video signal of a standard television system inputted externally. Second clock generation means for generating a second operation clock used for the flat display device based on the synchronization signal of the first display device; and a first operation clock from the first clock generation device for the flat display device. 6. The video reproducing apparatus according to claim 5, further comprising second switching means for switching and supplying a second operation clock from said second clock generating means.