JPH0993541A - Program information transmitter and decoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a program video without being impaired by changing a synthesis method of OSD signals depending on an aspect ratio of a receiver. SOLUTION: A transmission means constituted plural screens (141), conducts video compression (105), inserts (106) a frame screen, and codes the image signal (107), receives (109) a PAN and SCAN parameters, encodes (110) the result and multiplexes (108) with an output of the coding section 107 and the multiplexed signal is transmitted. A decoding means separates (113) the signal from the transmission means, decodes (114) a video signal, decodes (115) the PAN and SCAN signal, inputs (117) an aspect ratio of the display device, conducts PAN and SCAN processing (116), synthesizes (118) an OSD signal with an output of the processing section 116 for decoding. In the case of displaying the video signal onto a receiver whose aspect ratio is 16:9, the OSD video image is displayed without impairing the program video by changing the synthesis method between the program video and the OSD signal depending on the aspect ratio of the receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital processing of video signals, and more particularly to circuit means suitable for synthesizing video signals and OSD signals and displaying them on display devices having different aspect ratios.

[0002]

2. Description of the Related Art FIG. 8 shows a display example when a video signal having an aspect ratio of 4: 3 is received by a current wide TV receiver. In FIG. 8, display mode 1 is a method of displaying an image having an aspect ratio of 4: 3 in the center of the screen, and display mode 2 is a method of horizontally expanding and displaying an image having an aspect ratio of 4: 3, and a display mode. "3" is a method of enlarging and displaying an image having an aspect ratio of 4: 3 as a whole.
On the other hand, as one of the video transmission / reception methods, there is a method in which the transmission side compresses the information amount of an image before transmission, and the reception side decompresses the compressed image and displays it on the screen. A technique relating to image compression is defined in ISO / IEC13818-2, for example.

When displaying a video signal having an aspect ratio of 16: 9 on a receiver having an aspect ratio of 4: 3, PAN & SCA
N processing is required. The technology related to PAN & SCAN processing is also defined in ISO / IEC13818-2.

FIG. 2 shows the PAN & SCAN processing. In FIG. 2, 201 is an aspect ratio of 1
A frame of 6: 9, 202 is an aspect ratio to be displayed 4:
3 is a region, 203 is a center position of a frame having an aspect ratio of 16: 9, and 204 is a center position of a region having an aspect ratio of 4: 3. The PAN & SCAN parameters are the vertical and horizontal offsets of the center position 204 of the area having an aspect ratio of 4: 3 with respect to the center position 203 of the frame having an aspect ratio of 16: 9, and the offset of the area 202 having an aspect ratio of 4: 3 to be displayed. The vertical and horizontal sizes. By using this parameter, a frame with an aspect ratio of 16: 9 can be converted to an aspect ratio of 4: 3.
Can be extracted and displayed as an image with an aspect ratio of 4: 3.

[0005]

When a wide TV receiver receives an image with an aspect ratio of 4: 3, it is expanded horizontally and is compared with the original image except for the method of displaying the image in the center of the screen described above. The display is distorted or is enlarged so that a part of the original image is missing. Further, when the OSD video and the program video are displayed in a superimposed manner, the OSD video spoils the image of the program video.

FIG. 3 shows a display example in which the OSD image is superimposed on the program image. In FIG. 3, 301 is a display screen on the transmission side, 302 is a program video, and 303 is an aspect ratio of 16: 9.
Display screen on the receiver, 304 is a frame area, 305 is an OS
D image, 306 is a display screen on a receiver having an aspect ratio of 4: 3. As shown in FIG. 3, according to the display method of the conventional wide TV receiver, since the video 302 having the aspect ratio of 4: 3 is displayed in the center of the screen 303 having the aspect ratio of 16: 9, the OSD signal 305 is combined with the program video 302. In that case, there is a problem that the image of the program video 302 is damaged. In particular, in the case of a video composed of a plurality of small screens such as a promotional program for multi-channel broadcasting that is usually used in conventional CATV, it is possible that the contents of the small screen cannot be recognized by the OSD video, which is a big problem. Could be.

According to the present invention, a program information transmitting apparatus and a restoring method capable of changing a method of synthesizing an OSD signal and a program video signal according to the shape of the receiver so as not to spoil the program video in the receiver having an aspect ratio of 16: 9. A device is provided.

[0008]

According to the present invention, a plurality of screen constituting means for composing one screen by composing one or more programs and an output of the plurality of screen constituting means in a horizontal direction is about 3/4.
Video compression means for double compression, frame screen insertion means for inserting a frame screen, compressed video encoding means for digitally compressing the output of the frame screen insertion means, parameter input means for inputting PAN & SCAN parameters, and the parameters Transmission means including parameter coding means for coding the signal supplied from the input means, and multiplexing means for multiplexing the output of the compressed video coding means and the output of the parameter coding means, and the transmitting means. Separating means for separating the signal transmitted from the means, compressed video decoding means for expanding the compressed video signal, parameter decoding means for decoding the PAN & SCAN signal, shape input means for inputting the shape of the display device, and the parameter decoding PAN & SC to the output of the compressed video decoding means according to the output of the means and the shape of the display device.
PAN & SCAN processing means for performing AN processing, and the PAN & SCAN processing means for creating an OSD signal according to the shape of the display device.
OSD for synthesizing OSD signal with output of SCAN processing means
This can be achieved by being configured by the restoring means including the signal synthesizing means.

The plural screen construction means creates and outputs one screen from one or more input video sources.
The output is horizontally compressed by about 3/4 times by the compression means. The frame screen inserting means inserts a frame screen into the compressed video signal. The output is encoded by the compressed video encoding means. The signal supplied from the parameter input means is encoded by the parameter encoding means. The program information transmitting device multiplexes the output of the compressed video encoding means and the output of the parameter encoding means and transmits them.

The separating means separates the input signal by using the signal transmitted by the program information transmitting device as an input signal. The compressed video decoding means expands and decodes the video signal. The PAN & SCAN processing means performs PAN & SCAN processing on the decoded video signal according to the PAN & SCAN parameters decoded by the parameter decoding means and the shape of the receiver. The OSD signal synthesizing means may include the PAN & SCAN according to a shape of the receiver.
The output signal of the processing means and the OSD signal are combined. The restoration device thus restores the program image. In the case of a receiver having an aspect ratio of 16: 9, the OSD image can be superimposed on the frame screen area, and therefore display without damaging the image of the program image becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a program information transmitting apparatus and a restoring apparatus according to the present invention.

In FIG. 1, 101 is the first video source in the multi-screen, 102 is the second video source in the multi-screen, 103 is the n-th video source in the multi-screen, and 104 is n. A multi-screen composing unit that composes a multi-screen from the video source, 105 is a video compressing unit that compresses video, 106 is a frame screen inserting unit that inserts a frame screen into the compressed video, and 107 is a video that encodes a video signal Encoding unit, 108 is a multiplexing unit that multiplexes a plurality of signals, 109 is a parameter input unit that inputs PAN & SCAN parameters, 110 is a parameter encoding unit that encodes parameters, 111 is an output terminal of a transmission device, and 112 is a restoration unit. The input terminal of the device, 113 is a separating unit for separating the multiplexed signals,
114 is a video decoding unit that decodes the encoded video signal,
Reference numeral 115 is a parameter decoding unit that decodes the encoded parameters, and 116 is a PAN that performs PAN & SCAN processing.
& SCAN processing unit, 117 is a shape input means for inputting the shape of the receiver, 118 is an OSD signal synthesizing unit for creating an OSD signal and synthesizing it with a video signal, and 119 is an output terminal of the restoration device.

In FIG. 1, the transmission device inputs video signals from, for example, 16 video sources to a multi-screen construction unit 104 to form a multi-screen. The multi-screen image is input to the image compression unit 105 and compressed in the horizontal direction by about 3/4. The compressed multi-screen image is input to the frame screen insertion unit 106 to insert, for example, a frame screen in a black area on the right side of the compressed multi-screen. The video in which the frame screen is inserted is input to the video encoding unit 107 to be encoded and then input to the multiplexing unit 108. The PAN & SCAN parameters are coded by the parameter coding section 110 and then input to the multiplexing section 108. The coded video signal and the coded parameter signal are input to the multiplexing unit 108, and the multiplexed signal is transmitted. The decompression device separates the received signal into a coded video signal and a coded parameter signal in the separation unit 113. The encoded video signal is decoded by the video signal decoding unit 114, and the parameter is decoded by the parameter signal decoding unit 115, and input to the PAN & SCAN processing unit 116. The data indicating the shape of the receiver is input by the user to the shape input means 1
Then, the data is supplied to the PAN & SCAN processing unit 116 and the OSD signal synthesizing unit 118. PAN &
The SCAN processing unit performs PAN & SCAN processing on the video according to the signal and parameters from the shape inputting unit 117, and inputs the processed video signal to the OSD signal synthesis unit 118. The OSD signal synthesizer 118 uses the shape input means 117.
Either the OSD signal displayed on the screen having the aspect ratio of 16: 9 or the OSD signal displayed on the screen having the aspect ratio of 4: 3 is created and synthesized with the video signal based on the data obtained from.

FIG. 6 shows an example of the screen display of this embodiment. In FIG. 6, 601 indicates approximately 3/4 in the horizontal direction.
Double-compressed program video, 602 is a frame screen, 603 is a decompressed program video, 604 is a receiver OSD video with an aspect ratio of 16: 9, and 605 is a receiver OSD video with an aspect ratio of 4: 3. The same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

According to the present embodiment, it is possible to change the combination method of the video signal and the OSD signal according to the shape of the receiver and display it on the screen.

FIG. 7 shows another embodiment of the present invention. Figure 7
In FIG. 3, the same parts as those in FIG. The processing up to the multi-screen configuration unit 104 is the same as in the first embodiment. Multiple screen configuration unit 1
The output of 04 is input to the frame screen insertion unit 106, and for example, a frame screen in a black area is inserted on the right side of the multi-screen. The video signal in which the frame screen is inserted is horizontally moved by the video compression unit 105 by about 3
After being compressed / 4 times, it is input to the video encoding unit 107 and encoded. The subsequent processing is the same as in the first embodiment. This embodiment is different from the first embodiment in that a frame picture is inserted into a video signal and then compressed.

Also in this embodiment, the method of synthesizing the video signal and the OSD signal can be changed according to the shape of the receiver and the image can be displayed on the screen.

[0018]

According to the present invention, the whole program image can be displayed even in a receiver having an aspect ratio of 4: 3 in the image composed of a plurality of small screens such as a multi-channel broadcasting promotion program. For example, by inserting a frame screen with an aspect ratio of the program video of 4: 3, the entire program video can be displayed regardless of the shape of the receiver. Also, according to the shape of the receiver, the program video and OS
Aspect ratio of 16:
In the case of displaying on the receiver of No. 9, the OSD video can be displayed without spoiling the image of the program video by superimposing the OSD video on the frame screen area.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configurations of a program information transmission device and a restoration device to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a PAN & SCAN process.

FIG. 3 is a diagram showing a display example in which a program image and an OSD image are superimposed.

FIG. 4 is a block diagram showing a configuration of a program information transmission device to which an embodiment of the present invention is applied.

FIG. 5 is a block diagram showing a configuration of a program information restoration device to which an embodiment of the present invention is applied.

FIG. 6 is a diagram showing a screen display example in the program information transmitting apparatus and the restoring apparatus to which the embodiment of the present invention is applied.

FIG. 7 is a block diagram showing configurations of a program information transmitting apparatus and a restoring apparatus to which another embodiment of the present invention is applied.

FIG. 8 is a diagram showing a display example when a wide TV receiver receives a video signal having an aspect ratio of 4: 3.

[Explanation of symbols]

104 ... Plural screen composition section, 105 ... Video compression section, 10
6 ... Frame screen insertion unit, 107 ... Video encoding unit, 108 ...
-Multiplexing unit, 109 ... PAN & SCAN parameter input unit, 110 ... Parameter coding unit, 113 ... Separation unit,
114 ... video decoding unit, 115 ... parameter decoding unit, 1
16 ... PAN & SCAN processing unit, 117 ... Shape input means, 118 ... OSD signal synthesizing unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Katsumata, inventor 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Ltd. Multimedia system development headquarters, Hitachi, Ltd. (72) Takumi Okamura Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi, Ltd. Multimedia System Development Headquarters 292 (72) Inventor Yumi Bando Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Ltd. Multimedia System Development Headquarters

Claims (3)

[Claims] 1. A plurality of screen composing means for composing at least one or more programs to compose one screen having an aspect ratio of 4: 3, and an output signal of the plurality of screen composing means is approximately 3/4 times in the horizontal direction. And a frame for inserting a frame screen signal into a video signal horizontally compressed by about 3/4 in the horizontal direction in order to display a frame screen on either the left or right side of the video portion. Screen insertion means, compressed video encoding means for digitally compressing the output signal of the frame screen insertion means, parameter input means for inputting PAN & SCAN parameters, parameter encoding means for encoding the signal supplied from the parameter input means, A program compressed in the horizontal direction, comprising a multiplexing means for multiplexing the output of the compressed video encoding means and the output of the parameter encoding means. Program information transmission apparatus and transmits the image. 2. A separating means for inputting the multiplex signal transmitted by the program information transmitting apparatus according to claim 1 to separate at least the input signal, a compressed video decoding means for expanding the video signal, and a PAN & SCAN parameter decoding. Parameter decoding means, shape input means for inputting the shape of the display device, PAN & SCA processing for performing the PAN & SCAN processing on the output of the parameter decoding means and the output of the compressed video decoding means according to the shape of the display device.
N processing means and on-screen display (hereinafter referred to as OS
A program information restoring device, which comprises an OSD signal synthesizing means for producing a signal and synthesizing it with the output signal of the PAN & SCAN processing means, and changing the synthesizing method of the OSD signal according to the shape of the display device. 3. A plurality of screen composition means for composing at least one or more programs to form one screen having an aspect ratio of 4: 3, and a plurality of said screens for displaying a frame screen on either the left or the right of the video part. A frame screen inserting means for inserting a frame screen signal into the output video signal of the screen forming means, a video compressing means for compressing the output signal of the frame screen inserting means to about 3/4 times in the horizontal direction, and the video compressing means. , A compressed video encoding means for digitally compressing the output signal, a parameter input means for inputting PAN & SCAN parameters, a parameter encoding means for encoding the signal supplied from the parameter input means, an output of the compressed video encoding means and the parameter encode A multiplexing means for multiplexing the outputs of the means, and transmitting the program video compressed in the horizontal direction. That program information transmission apparatus.