KR100301006B1 - A recording medium storing aspect ratio information of a subject image and an apparatus and method for recording and reproducing a subject image - Google Patents

Abstract

The present invention discloses a recording medium in which aspect ratio information of a subject image is stored, and an apparatus and method for recording and reproducing a subject image. According to the present invention, a subject image constituting a menu is reduced to a small screen on a recordable and rewritable disc, and then the image of the small screen is encoded and recorded. According to this aspect ratio information, the main subject image is reproduced as the image having the aspect ratio of the original image, so that the subject image of the original image in the 16: 9 ratio can be configured visually and naturally without deformation, and the user is displayed as a menu. It is easy to distinguish whether the aspect ratio of the original image is 16: 9 or 4: 3 by looking at the shape of the main image.

Description

A recording medium storing aspect ratio information of a subject image and an apparatus and method for recording and reproducing a subject image

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of recording and reproducing audio and video (A / V) data on a recording medium using a recordable and rewritable disc. Specifically, the present invention relates to a recording medium on which aspect ratio information of a subject image constituting a menu is recorded, and the recording medium. The present invention relates to a recording and reproducing apparatus and method for reproducing a main subject image according to the aspect ratio information.

In an A / V recording / reproducing apparatus such as a DVD (Digital Versatile Disc) recorder using a recordable and rewritable disc, it is necessary to support a menu for the user's convenience. This menu is a function to support random access so that a user can easily and quickly navigate to a desired title or desired point when playing a recorded recording (which may be a program or a title but referred to as a title). That is, the menu may generally include a background screen, a subject image, and the like as shown in FIG. 1.

Here, the main image serves to easily recognize the contents of each title, and is usually a form in which one scene (intra picture) of the corresponding title is reduced to a small screen, also referred to as a thumbnail image.

2 is a diagram for explaining recording and reproducing of an image having a general 16: 9 aspect ratio. In general, when the A / V recording / reproducing apparatus 20 using a disc records an input image 10 having an aspect ratio of 16: 9, most of the input image 10 having a 16: 9 ratio is not recorded as it is. In this case, a filter is used to convert an image having an aspect ratio of 4: 3 ratio, and the encoded 4: 3 ratio image 21 is encoded to record encoded 4: 3 ratio image data on the disc 22. The 4: 3 ratio image 21 is pressed in the horizontal direction as compared with the original 16: 9 ratio input image 10.

The playback is divided into a case where a user uses a wide TV 30 supporting a 16: 9 ratio and a case where a general TV 40 having a 4: 3 ratio is used. In the case of using the wide TV 30, the recording and playback device 20 decodes 4: 3 ratio image data recorded on the disc 22, and then decodes the 4: 3 ratio image in the normal mode. When outputting to a 16: 9 wide TV 30, the wide TV 30 converts an image of 4: 3 ratio into a 16: 9 ratio and displays it on a screen. In case of using the general 4: 3 TV 40, the general TV 40 is converted into a pan scan or letter box by converting the 4: 3 ratio image decoded by the recording / playback device 20 into a pan scan or letter box. When output to the normal TV 40 it is displayed on the screen as it is.

Here, the fan scan mode is a form in which a part of an image of a 16: 9 ratio is cut out, and the letter box mode is a form in which the image is reduced so that all 16: 9 images are displayed on a 4: 3 TV screen. Screen display modes such as normal mode, fan scan mode and letter box mode may be selected by the user.

As described above, in most A / V recording and reproducing apparatus 20, the input image is encoded on the basis of 4: 3 ratio and recorded on the disc once, regardless of whether the input image is 16: 9 ratio or 4: 3 ratio. The output form is adjusted in consideration of the original ratio of the encoded video and the selection of the user's screen display mode at the time of reproduction.

Therefore, if the user wants to record the subject video for the original 16: 9 video in the recording / playback device that supports the menu and converts the 16: 9 video to 4: 3 video, one of the recorded video Select a scene, reduce it to a small picture, encode it, and record it on a disc. In this case, since the aspect ratio of the original image is smaller than the aspect ratio of 16: 9 or 4: 3, only the small size is converted, and the main image having the aspect ratio of 16: 9 of the original image is also generated in a horizontally pressed form during playback. When the generated subject image is displayed on the screen as a menu, the subject image for a title having a 4: 3 aspect ratio is normally displayed, but the subject image for a title having a 16: 9 aspect ratio is displayed in an elongated form, resulting in visually disturbing results. There was a problem that brought about.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a recording medium in which aspect ratio information of a subject image constituting a menu is stored.

Another object of the present invention is to provide a recording / playback apparatus capable of displaying a subject image of an original image in a 16: 9 ratio normally according to aspect ratio information of a subject image for constituting a menu.

It is still another object of the present invention to provide a recording and reproducing method that can normally display a subject image of an original image in a 16: 9 ratio without modification according to aspect ratio information of a subject image for constituting a menu.

In order to achieve the above object, a recording medium according to the present invention is a recordable and rewritable recording medium comprising: aspect ratio information of the subject images is stored in an information area of a subject image for subject images of a small screen constituting a menu; It is characterized by.

In order to achieve the above another object, the recording and reproducing apparatus according to the present invention is an apparatus for recording and reproducing audio and video (A / V) data on a recordable and rewritable disc, comprising: for subject images constituting a menu; An aspect ratio information of the subject images is recorded as information of the subject image, an encoder for outputting the encoded subject image by encoding the subject images into a small screen image having a predetermined size, and the encoded subject image are decoded according to the aspect ratio information. And a decoder for converting an aspect ratio of the main image.

In order to achieve the above another object, the recording and reproducing method according to the present invention is a method for recording and reproducing audio and video (A / V) data on a recordable and rewritable disc, comprising: subject images constituting a menu; Storing aspect ratio information of the subject images in an information region of the subject image, generating the encoded subject image by encoding the subject images into a predetermined small screen image, decoding the encoded subject image, and decoding according to the aspect ratio information Converting the subject image to have an aspect ratio of the original image.

1 is an example of a general menu screen.

2 is a diagram for explaining recording and reproducing of an image having a general 16: 9 aspect ratio.

3 is an example of subject image information according to the present invention.

4 is an example of a menu screen configured using aspect ratio information according to the present invention.

5 is a block diagram of an encoder of an apparatus for recording and playing a subject image according to the present invention.

6 is a block diagram according to an embodiment of the decoder of the apparatus for recording and reproducing a subject video according to the present invention.

7 is a flowchart according to an embodiment of a method of reproducing a subject image according to the present invention.

Hereinafter, with reference to the accompanying drawings, a description will be given of a preferred embodiment of a recording medium and a recording and reproducing apparatus and method of the subject image is stored aspect ratio information of the subject image according to the present invention.

In the present invention, when the main subject image is recorded, the original subject is reduced to a small screen in the same manner regardless of whether the aspect ratio of the original image is 16: 9 or 4: 3, and the reduced subject image is encoded and recorded. In the information area for managing the subject image, aspect ratio information indicating whether the subject image is 16: 9 ratio or 4: 3 ratio is recorded.

That is, FIG. 3 shows an example of an information area and a recording area of a subject image. As shown in FIG. 3, the subject image information includes a number of subject images, a start address of a recording area of the subject image, and respective subject image information, and may further include other subject image information.

The number of the subject images is information indicating the total number of the subject images, and the start address of the recording area of the subject image is information indicating the start position of the region where the actual subject images are recorded. Each subject image information is located after a start address of a recording area of a subject image, and an example is a structure in which actual subject images are recorded after each subject image information. The recording area of the actual subject video may be configured separately from the information area of the subject video, or may be configured in the same file.

Each subject image information may include a title number of the subject image, a start position of the title of the subject image, a recording time of the subject image, a recording position of the subject image, an aspect ratio of the subject image, and the like. The title number and the starting position of the title for the subject video are information for indicating which title is represented by the subject video. When the user selects the subject video from the menu, the title video is moved and played. This is necessary information. In addition, the recording time of the subject image indicates the time when the user recorded the subject image, the recording position of the subject image indicates the position where the data of the subject image is recorded on the actual disk, and the aspect ratio of the subject image is 16 Information indicating whether it is a: 9 ratio or a 4: 3 ratio, and is referred to during menu playback.

When the menu is displayed, the subject image information is read and the recording position and actual aspect ratio of the subject image are read. Then, the subject image data is read and decoded from the read recording position. By reconstructing the decoded subject image to the actual 16: 9 image by using the filter to enlarge in the direction, the menu is configured after restoring to the aspect ratio of the natural original image, and the menu is configured as it is if it is 4: 3. As shown in FIG. 2, a visually natural menu screen can be configured, and the user can easily distinguish whether the aspect ratio of the original image is 16: 9 or 4: 3 by only looking at the shape of the main subject image on the menu. In FIG. 4, reference numerals 11 and 14 denote a subject image in a 4: 3 ratio, and reference numerals 12 and 13 denote a subject image in a 16: 9 ratio.

The form of the menu illustrated in FIG. 4 is basic, and the form of the menu displayed according to the display device may be further modified. For example, a short description may be added to the title to make it easier for the user to understand the content of the title, or to highlight the selected topic image so that the user knows the subject image for the currently selected title. You can also create and display a border around the subject image.

On the other hand, regardless of whether the input image is 16: 9 ratio or 4: 3 ratio, once the subject image is encoded and recorded based on 4: 3 ratio, the encoder for recording aspect ratio information in the information area of the subject image is shown in FIG. As shown in. In Fig. 5, the audio encoder 102 encodes the input audio data and applies the encoded audio data to a MEPG system layer encoder (hereinafter abbreviated as MPEG encoder: 110).

The video encoder 104 encodes the input video data and applies the encoded video data to the MPEG encoder 110. The MPEG encoder 110 multiplexes the encoded audio data and the video data and outputs them as an MPEG system layer stream.

On the other hand, the subject video buffer 106 temporarily stores the subject video data of one desired screen for the title and converts the subject video data to a small picture of 4: 3 ratio regardless of the aspect ratio of the original video by the filter 108. The video encoder 104 encodes the main video of the small picture and applies the encoded main video data to the MPEG encoder 110. The MPEG encoder 110 outputs the encoded subject image data as an MPEG system layer stream. Here, a separate video encoder for the subject image may not be necessary, and encoding for the subject image is performed by the general video encoder 104. In addition, the subject image information including the aspect ratio information of the subject image as shown in FIG. 3 is stored in the information region of the subject image.

6 is a block diagram according to an embodiment of a decoder of a subject image recording and reproducing apparatus according to the present invention, in which an MPEG system layer decoder (abbreviated as MPEG decoder: 202) is an encoded MPEG system layer stream (MPEG stream). Demultiplexing the video stream and the audio stream from the audio stream is applied to the audio decoder 204, and the video stream is applied to the video decoder 206. The MPEG decoder 202 also extracts subject video data from the MEPG stream and applies it to the video decoder 206.

First, reproduction of general audio and video data will be described. The audio decoder 204 decodes the demultiplexed audio stream in the MPEG decoder 202 to output an audio signal, and the video decoder 206 decodes the demultiplexed video stream in the MPEG decoder 202 to interface with the user. The decoded video signal is output according to the display mode selection control signal CON1 output from the system controller 208 according to the normal mode, the pan scan mode, or the letter box mode.

Meanwhile, the subject image data output from the MPEG decoder 202 is decoded by the video decoder 206, and a separate MPEG video decoder for the subject image is not necessary.

The system controller 208 inputs the subject image information read from the disc to read the aspect ratio in the subject image information to control whether the aspect ratio of the current subject image decoded by the video decoder 206 is 4: 3 or 16: 9. The signal CON2 is applied to the switch 210.

The switch 210 applies the decoded main image to the menu generator 214 when the aspect ratio of the main image decoded from the video decoder 206 is 4: 3 according to the aspect ratio control signal CON2, and decodes the decoded main image if the aspect ratio is 4: 3. The subject image is applied to the filter 212.

The filter 212 converts the decoded subject image into a subject image having a 16: 9 ratio and applies it to the menu generator 214. The menu generator 214 uses a switch 210 to display a 4: 3 ratio topic image decoded by the video decoder 206 and a 16: 9 ratio topic image through the filter 212 on one screen. Collect the number to create the theme video menu.

On the other hand, regardless of whether the input image is 16: 9 ratio or 4: 3 ratio, the disc is encoded after recording the subject image based on 4: 3 ratio, and the aspect ratio information of the subject image is recorded in the information area of the subject image. A flowchart according to an embodiment of a method for reproducing a subject video according to the aspect ratio information from is shown in FIG. 7.

In FIG. 7, the subject image information is read by accessing the information region of the subject image (step S101), and the start address of the recording region of the subject image in the read subject image information is read to access the recording position of the subject image. (Step S102), the main subject image data is read and decoded according to the start address of the read-out subject image recording area (step S103), and the aspect ratio information is read from the read subject image information (step S204), and the aspect ratio is 16: If 9, the decoded main image is filtered to have a 16: 9 ratio (S105).

If the aspect ratio information read in step S104 is 4: 3, the decoded subject image having an unfiltered 4: 3 ratio and the filtered aspect ratio image having a filtered 16: 9 ratio are displayed as a menu screen when the read aspect ratio is 16: 9. (Step S106).

As described above, the present invention records aspect ratio information of a subject image on a recordable and rewritable disc, and when subject images are played back according to the aspect ratio information, the subject image of a 16: 9 aspect ratio image is normally displayed without modification. Therefore, there is an effect of constituting a visually natural menu screen and an effect of easily distinguishing whether an aspect ratio of an original image is 16: 9 or 4: 3 even if the user only sees the shape of the main image displayed on the menu.

Claims (13)

In recordable and rewritable recording media: And aspect ratio information of the subject images is stored in an information area of the subject image for the subject images of the small screen constituting the menu. The recording apparatus of claim 1, wherein the information area of the subject image stores the number of the subject images representing the total number of the subject images, the location information of the region where the actual subject images are recorded, and the respective subject image information. media. The method of claim 2, wherein each of the subject image information includes a title number of a subject image, a start position of a title of the subject image, a recording time of the subject image, a recording position of the subject image, and an aspect ratio of the subject image. Characterized in that the recording medium. A device for recording and playing back audio and video (A / V) data on a recordable and rewritable disc: An encoder for recording aspect ratio information of the subject images as information of a subject image constituting a menu, and encoding the subject images into a predetermined small screen image and outputting an encoded subject image; And And a decoder for decoding the encoded subject video and converting an aspect ratio of the decoded subject video according to the aspect ratio information. 5. The recording and reproducing apparatus according to claim 4, wherein the encoder reduces the subject images to a small picture having a predetermined size of 4: 3 ratio regardless of the original aspect ratio and encodes the reduced subject images. The method of claim 4, wherein the decoder, An MPEG decoder for extracting subject video data from an input MPEG stream; A video decoder to decode the subject image data and output a decoded subject image; A filter for converting the decoded main image into an image having an aspect ratio of 16: 9 and outputting the converted main image; A menu generator configured to configure a main screen image decoded by the video decoder and a main screen image converted by the filter into a menu screen; And And a switch for applying the decoded subject image to the filter when the aspect ratio of the decoded subject image is 16: 9 according to an aspect ratio control signal, and otherwise applying the decoded subject image to a menu generator. The recording and reproducing apparatus according to claim 6, further comprising a system controller for reading aspect ratio information in the subject image information to generate an aspect ratio control signal, recognizing a screen display mode selected by a user, and generating a display mode selection control signal. . The video decoder of claim 7, wherein the video decoder decodes the video stream into the MPEG stream and outputs the decoded video signal to the normal mode, the pan scan mode, or the letter box mode according to the display mode selection control signal. Record and playback device. A method of recording and playing back audio and video (A / V) data on a recordable and rewritable disc: (a) storing aspect ratio information of the subject images in an information area of a subject image for a subject image constituting a menu, and encoding the subject images into a predetermined small screen image to generate an encoded subject image; And (b) decoding the encoded subject image and converting the decoded subject image to have an aspect ratio of the original image according to the aspect ratio information. 10. The recording and reproducing method according to claim 9, wherein in the step (a), the main image is reduced to a small picture having a predetermined size of 4: 3 ratio regardless of the original aspect ratio, and the reduced main image is encoded. . The method of claim 9, wherein step (b) comprises: (b1) reading subject image information by accessing the subject image information region; (b2) decoding the subject image by reading the subject image according to the recording position information of the subject image in the read subject image information; And and (b3) converting the decoded subject image to have an aspect ratio of the original image according to the aspect ratio information in the read subject image information. The method of claim 11, wherein step (b3), (b31) reading an aspect ratio in the read subject image information; And and (b32) filtering the decoded subject image to have a 16: 9 ratio when the read aspect ratio is 16: 9. The method of claim 12, wherein step (b3), (b33) If the aspect ratio information read in step (b31) is 4: 3, the unfiltered 4: 3 ratio of the decoded subject image is filtered and if the read aspect ratio is 16: 9, the filtered 16: 9 ratio subject image is displayed. The recording and reproducing method further comprising the step of configuring the screen.