JP2002135740A - Video signal transmission method and reproduction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute an automatic control such as expansion and the like when displaying in a video signal of letter box form. SOLUTION: A signal from aspect ratio input means 3 is supplied to a code signal generating circuit 4. Further, a video signal from a signal source 1 is supplied to a code signal inserting/adding circuit 5, and the code signal from the code signal generating circuit 4 is inserted and added to the code signal inserting/adding circuit 5. A video signal with this code signal inserted and added is supplied to a video cassette recorder(VCR) 6 where it is recorded on a recording medium 7. In addition, a reproduced signal from the VCR 6 is supplied to an image processing circuit 8. The reproduced signal is also supplied to a decoder 9 where the code signal with the above aspect ratio is discriminated. The discriminated aspect ratio is supplied to the image processing circuit 8. In this manner, the reproduced image is expanded or contracted. Further, the video signal which was expanded or contracted is supplied to a receiving set with an aspect ratio of 16:9 where the expanded or contracted reproduction image is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal transmission method for recording video signals having a plurality of aspect ratios, such as movie software, and a receiver.

[0002]

2. Description of the Related Art For example, in a movie for a theater, in addition to a so-called standard size having an aspect ratio of 4: 3,
European Vista size with aspect ratio 1.66: 1, American Vista size with 1.85: 1, 2.1
Various formats such as 8: 1 70 mm and 2.35: 1 cinemascope size are employed. Therefore, such a movie for a theater has an aspect ratio of 4: 3 (= 1.3).
When converting to the current video signal of 3: 1), for example, as shown in FIG. 4A, the so-called letterbox format in which the left and right sides of the reproduced image match the left and right sides of the screen and black portions are provided at the top and bottom Is used.

On the other hand, the current video signal having an aspect ratio of 4: 3 has an aspect ratio of 16: 9 (= 1.78:
A widened video signal is proposed in 1), and a receiver for projecting such a widened video signal is being implemented. However, at present, most video signals have an aspect ratio of 4: 3, and an aspect ratio of 1
The number of video signals of 6: 9 is small. Therefore, in such a receiver, when a video signal having an aspect ratio of 4: 3 is supplied, processing such as displaying a reproduced image based on the video signal in the center of the screen is performed. .

However, in such a receiver, when the above-described letter box format video signal is projected, the reproduced image has an aspect ratio of 16: 9 as shown in FIG.
In the range of 4: 3 in the center of the screen, the above-mentioned letter box format video signal is further projected, and black portions are provided on the upper, lower, left and right sides.
On the other hand, conventionally, a means for enlarging a reproduced image is provided in the receiver, and the viewer manually controls the enlargement ratio so that the reproduced image is projected on the entire screen. I was

As a means for enlarging the reproduced image, a method of enlarging the image by image processing such as interpolation using an image memory, or a method of enlarging the horizontal and vertical deflection widths is adopted. The enlargement is performed so that the top and bottom of the image coincide with the screen. Therefore, for the European Vista size having an aspect ratio smaller than 16: 9, enlargement is performed so that black portions remain on the left and right, and the American Vista size is 70 m.
16: 9 aspect ratio such as m, cinema scope size
The larger one is enlarged so that the left and right are slightly cut off.

However, such a method in which the viewer manually controls the enlargement ratio is not preferable because the viewer is forced to perform troublesome operations. There is a problem that the user does not notice that the control remains, and there is a risk that correct viewing may not be performed. The present invention has been made in view of such a point.

[0007]

The problems to be solved by the manual control method are that the viewer is obliged to perform cumbersome operations and that there is a risk that correct viewing may not be performed. That is.

[0008]

A first means according to the present invention receives a letterbox format video signal generated from a signal source, generates a code corresponding to an image of the letterbox format video signal, and A video signal transmission method in which a code is inserted into the twentieth and 283 horizontal lines of a signal and recorded on a medium, wherein the code is a video signal having an image having an aspect ratio of 4: 3 or a video having an image in a squeeze format. A video signal transmission method comprising: 20-bit data including a first bit indicating whether the signal is a signal and a second bit indicating whether the signal is a video signal having a letterbox format image.

A second means according to the present invention is to receive a letterbox format video signal generated from a signal source, generate a code corresponding to the image of the letterbox format video signal, and generate the twentieth and 283th video signals. This is a video signal transmission method in which a code is inserted on a horizontal line. When the first bit is 0, the code indicates a video signal having an image with an aspect ratio of 4: 3. It is characterized by comprising 20-bit data indicating that the video signal has a squeeze format image in a certain case and that the video signal has a letterbox format image when the second bit is 1. Video signal transmission method.

A third means according to the present invention determines a code consisting of 20-bit data inserted on the twentieth and 283 horizontal lines of a video signal, and determines an aspect ratio when the first bit of the code is zero. Is a video signal having a 4: 3 image, if the first bit is 1, it is a video signal having a squeeze format image, and if the second bit of the code is 1, a video having a letter box format image An image receiver according to claim 1, wherein an image corresponding to a first bit and a second bit is projected as a signal.

According to a fourth aspect of the present invention, there is provided a receiver having a reproduction screen having an aspect ratio of 16: 9, which is inserted on the twentieth and 283 horizontal lines of a video signal having an image having an aspect ratio of 4: 3. A code consisting of 20-bit data is discriminated. If the first bit of the code is 0, the video signal has an image with an aspect ratio of 4: 3. If the first bit is 1, a squeezed image is generated. And displaying a reproduced image corresponding to the first bit and the second bit on a reproduction screen as a video signal having a letter box format image when the second bit of the code is 1 when the second bit of the code is 1. It is a receiver.

[0012]

According to this, since the aspect ratio is converted into a code signal by a letter box format video signal and transmitted together with the video signal, control such as enlargement at the time of projection can be automatically performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
A video signal source having an aspect ratio of 4: 3, such as a C converter or an NTSC telecine device (a device for forming a video signal from a movie film), a tuner, a master recording / reproducing device, and the like. Therefore, when the video signal from the signal source 1 is supplied to the receiver 2 having an aspect ratio of 4: 3, black portions (oblique lines) are provided at the top and bottom according to the aspect ratio of the original image as shown in FIG. The playback image in the letterbox format is displayed.

Reference numeral 3 denotes an aspect ratio input means. Therefore, the input means 3 is connected to the signal source 1 of the muse-NT
In the case of the SC converter, the ratio is defined as 16: 9. The telecine device is determined according to the format of the movie film. On the other hand, in the case of a tuner or a master recording / reproducing apparatus, for example, an aspect ratio is obtained from a reproduced image projected on the receiver 2 and input.

A signal from the input means 3 is supplied to a code signal generation circuit 4. Further, the video signal from the signal source 1 is supplied to a code signal insertion / addition circuit 5, and the code signal from the generation circuit 4 is inserted and added.

As a method of inserting and adding the code signal, for example, the 20th and 283rd NTSC video signals are used.
As shown in FIG. 2A, 20-bit data is inserted and added using horizontal lines. Here, the 20-bit data consists of a 6-bit word 0, 4-bit words 1 and 2 and a 6-bit CRCC as shown in FIG.

For this word 0, as shown in FIG. 3C, whether the first bit is a squeeze signal ("1") obtained by compressing the left and right sides of the image or a normal signal ("0") is determined. Code. The second bit is a code for determining whether the signal is a letter box signal ("1") or a normal signal ("0"). Third
Bits have a muse with an aspect ratio of around 1.78: 1-
The determination code is used to determine whether the signal is a Vista-size signal (“1”) including an NTSC converter or a cinemascope-size signal (“0”) including 70 mm around 2.2: 1. The fourth and fifth bits are undefined, and the sixth bit is a discrimination code for other processing (panning) or the like.

In this manner, the code signal having the aspect ratio is inserted and added to the video signal. The video signal to which the code signal is inserted is added to a video cassette recorder (VC
R) 6 and is recorded on the recording medium 7. Note that the code signal of the aspect ratio is separately added to the video signal from the code signal generation circuit 4 without being added to the video signal as described above.
To modulate the CTL signal of VCR6,
It may be recorded in a code area related to the CM audio signal.

Further, the reproduced signal from the VCR 6 is supplied to the image processing circuit 8. Also, if the reproduced signal is a decoder 9
And the code signal having the above-described aspect ratio is determined. Then, the determined aspect ratio is supplied to the image processing circuit 8. As a result, the reproduction image is enlarged or reduced. Further, the enlarged or reduced video signal of the image is supplied to the receiver 10 having an aspect ratio of 16: 9, and the enlarged or reduced reproduced image is displayed.

That is, as shown in FIG. 3A, for example, when a normal NTSC video signal is supplied to a receiver 10 having an aspect ratio of 16: 9, the horizontal image is compressed and the reproduced image is reproduced. Projection is performed. On the other hand, when the video signal of the letter box format is supplied to the receiver 10 having the aspect ratio of 16: 9, the image in the vertical direction is enlarged as shown in FIG. Done. In this case, when the video signal is a signal of, for example, a cinemascope size, the image in the horizontal and vertical directions is further enlarged and the reproduced image is displayed as shown in C of FIG.

Thus, according to the above-described apparatus, the aspect ratio is converted into a code signal (generation circuit 4) in the letterbox format video signal (signal source 1) and transmitted together with the video signal (insertion addition circuit 5). Control such as enlargement (image processing circuit 8) at the time of projection can be automatically performed.

In the above-described apparatus, when a code signal having an aspect ratio is separately extracted from the VCR 6, the code signal can be directly supplied to the decoder 9 for control. The enlargement or reduction of the reproduced image can also be performed by controlling the horizontal and vertical deflection widths of the receiver 10.

In the above-described apparatus, the circuits 3, 4 and 5 between A and B in the drawing may be built in the signal source 1 or in the VCR 6. The circuits 8 and 9 after C are built in the receiver 10.

Further, in the above-described apparatus, the aspect ratio is set to two, that is, the Vista size and the cinemascope size. However, the aspect ratio may be converted into a code signal with various aspect ratios. Further, the numerical value of the aspect ratio may be directly converted into data and transmitted. In these cases, transmission may be performed in units of several fields.

[0025]

According to the present invention, since the aspect ratio is converted into a code signal in a letter box format video signal and transmitted together with the video signal, control such as enlargement during projection can be automatically performed. It became so.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of an apparatus for implementing a video signal transmission method according to the present invention.

FIG. 2 is a diagram for explaining this.

FIG. 3 is a diagram for explaining this.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

1: video signal source, 2: receiver with aspect ratio of 4: 3, 3
... Aspect ratio input means, 4 ... Code signal generation circuit,
5: code signal insertion / addition circuit, 6: video cassette recorder (VCR), 7: recording medium, 8: image processing circuit, 9: decoder, 10: receiver having an aspect ratio of 16: 9

Claims (4)

[Claims] 1. A video signal in a letterbox format generated from a signal source is received, a code corresponding to an image of the video signal in the letterbox format is generated, and the code is generated on the twentieth and 283 horizontal lines of the video signal. A video signal transmission method of inserting a code and recording the same on a medium, wherein the code is a first bit indicating whether the video signal has an aspect ratio 4: 3 image or a squeezed image signal; A video signal transmission method comprising 20-bit data including a second bit indicating whether the video signal has a letterbox format image. 2. Receiving a letterbox format video signal generated from a signal source, generating a code corresponding to an image of the letterbox format video signal, and forming the code on the twentieth and 283 horizontal lines of the video signal. A video signal transmission method for inserting a code, wherein the code is a video signal having an image with an aspect ratio of 4: 3 when the first bit is 0, and the code is a signal when the first bit is 1 A video signal having a squeeze format image, and 20 bits of data when the second bit is 1 indicating a video signal having a letterbox format image. Signal transmission method. 3. A code consisting of 20-bit data inserted on the twentieth and 283 horizontal lines of a video signal is determined. If the first bit of the code is 0, an image having an aspect ratio of 4: 3 is determined. And the first bit is 1
If the second bit of the code is 1, a video signal having a letterbox format image is obtained when the second bit of the code is 1, and an image corresponding to the first bit and the second bit is obtained. A receiver characterized by projection. 4. A reproduction screen is a receiver having an aspect ratio of 16: 9, and a twentieth video signal having an image having an aspect ratio of 4: 3.
And a code consisting of 20-bit data inserted on the 283 horizontal line is determined. If the first bit of the code is 0, the video signal has an aspect ratio of 4: 3. 1
And a video signal having a squeeze format image when the second bit of the code is 1, and a video signal having a letter box format image when the second bit of the code is 1. A receiver for displaying a reproduced image according to the image.