JP5105861B2 - Video server and its angle of view conversion method - Google Patents

Description

  The present invention relates to a video server that is applied to a terrestrial digital broadcasting system and the like, converts a video material into a designated angle of view, and transmits the same.

  Digital television broadcasts include high-definition broadcast signals (HDTV: High Definition Television) and standard resolution broadcast signals (SDTV: Standard Definition Television). The HDTV screen size is defined as 16: 9 (wide screen size), and the SDTV screen size is defined as 4: 3 (standard screen size). In a conventional video server, for example, when an HDTV video material is converted to an SDTV and transmitted with a screen size, there is a problem that the video is missing or unnatural.

The angle of view information is one piece of identification control information attached to a broadcast signal in digital television broadcasting. This is additional information that can be used mainly for high-definition broadcast signals and can identify display on a 4: 3 screen size. This type of related technology is disclosed in the following Patent Documents 1 to 3.
JP 2004-289359 A JP 2005-64621 A JP 2005-109549 A

  As described above, in a conventional video server, for example, when HD video material is transmitted for SD broadcasting, if the angle of view of the original HD video material is ignored, the video is missing or unnatural. There was a problem.

  The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a video server capable of appropriately converting the angle of view of a video material at the time of transmission and a method of converting the angle of view. .

In order to achieve the above object, the video server according to the present invention includes either a first angle of view that makes the entire wide screen effective, or a second angle of view that makes the wide screen by adding invalid areas to both sides of the standard screen. or in which, a plurality of high resolution (HD: high Definition) and HD storage means for storing the video material, said HD video material of the first angle of view, letterbox format for displaying said wide-screen throughout the center of the standard screen Side-cut SD that converts the HD video material with the second angle of view into a standard screen size by cutting both sides of the wide screen from the first conversion mode for converting to standard definition (SD) video material. Storage means for storing an angle-of-view conversion table in which a second conversion mode for conversion to video material is registered, and an instruction to designate and transmit HD video material stored in the HD storage means for use in SD broadcasting Depending on, it reads the corresponding HD video material from the HD storage unit, select a conversion mode corresponding from the angle conversion table based on the information of the angle of view corresponding to the read HD video material, the conversion Comprising HD / SD conversion means for converting the read HD video material into SD video material according to a mode; and sending means for sending the SD video material converted by the HD / SD conversion means. To do.

In addition, the video server angle-of-view conversion method according to the present invention includes either the first angle of view that makes the entire wide screen effective, or the second angle of view that adds an invalid area to both sides of the standard screen to make a wide screen. it is how to accumulate a plurality of HD video material, first conversion mode for converting the HD video material of the first angle, to the SD video material in letterbox format for displaying said wide-screen throughout the center of the standard screen When the the HD video material of the second angle, the second conversion mode and angle conversion table registers the conversion to the side cutting format SD video material to the standard screen size by cutting the both sides of the wide screen storing, in response to said instruction for transmitting the stored HD video material for the specified to SD broadcast, reads the HD video material corresponding from the stored HD video material, the read HD Select the translation mode corresponding from the angle conversion table based on the information of the angle of view corresponding to an image element, and converts the read HD video material in accordance with the conversion mode to the SD video material, is the conversion SD video material is transmitted.

The video server and its angle conversion method according to the above configuration stores the angle conversion table and conversion mode and registered for each field angle information of HD video material for converting the HD video material to SD video material. When the HD video material is transmitted for SD broadcasting, the conversion mode is selected from the angle-of-view conversion table based on the angle-of-view information of the HD video material, and converted to the SD video material. With this configuration, when an HD video material is transmitted for SD broadcasting, it is possible to broadcast at an appropriate angle of view without lacking or uncomfortable video.

  Therefore, according to the present invention, it is possible to provide a video server capable of appropriately converting the angle of view of the video material at the time of transmission and the angle of view conversion method thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a functional block diagram showing an embodiment of a video server according to the present invention. The video server 100 includes an ancillary inserters 11 and 12, an HD encoder 21, an SD encoder 22, an angle of view conversion unit 30, a data memory 40, an HD decoder 51, an SD decoder 52, an ancillary reader 61, 62, a down converter 71 and an up converter 72 are provided.

  In the video server 100, HD video material and SD video material are mixed and recorded in the data memory 40 as material data. When an HD video material to be recorded is input to the video server 100, the ancillary inserter 11 inserts the angle-of-view information of the material into the ancillary area of the HD video material based on filing data. An ancillary area is an area in which auxiliary data regarding video materials such as inter-broadcast station control signals and caption packets can be arbitrarily described. The HD video material into which the angle-of-view information is inserted is compressed into a predetermined format by the HD encoder 21 and then recorded in the data memory 40. Similarly, when an SD video material to be recorded is input to the video server 100, the angle of view information is inserted into the ancillary area by the ancillary inserter 12, and then compressed into a predetermined format by the SD encoder 22. Recorded in the data memory 40.

  An angle-of-view conversion table 41 is stored in the data memory 40 in advance. The angle-of-view conversion table 41 registers the angle of view of each recorded video material and the angle of view according to the screen size at the time of transmission as a conversion mode. FIG. 2 shows an example of angle-of-view conversion of 16: 9 material. For example, in the case of a video material of 16: 9, if the video is converted to 4: 3 side cut, the left and right videos are lost, so the video material is converted to 4: 3 letterbox. Also, in the case of 16: 9 side panel video material, if it is converted into 4: 3 letterbox, it becomes unnatural, so it is registered in the angle-of-view conversion table 41 as a conversion mode so that it is converted into 4: 3 side cut.

  On the other hand, when there is a transmission request specifying the HD video material to the video server 100, the corresponding HD video material is read from the data memory 40, and the HD decoder 51 performs decompression processing. The ancillary reader 61 reads the angle-of-view information inserted into the ancillary area from the HD video material expanded by the HD decoder 51, and determines the angle of view of this material. The ancillary reader 61 outputs the decompressed video material as it is when outputting for HD broadcasting. When outputting for SD broadcasting, the angle-of-view conversion unit 30 selects the angle-of-view conversion mode based on the angle-of-view conversion table 41, and the down-converter 71 selects the decompressed HD video material as the selected image. SD video material is output by down-converting in the corner conversion mode.

  Further, when there is a transmission request specifying the SD video material to the video server 100, the corresponding SD video material is read from the data memory 40, and decompression processing is performed by the SD decoder 52. The ancillary reader 62 reads the angle of view inserted in the ancillary area to determine the angle of view, and in the case of SD output, outputs the SD as it is. When outputting for HD broadcasting, the angle-of-view conversion unit 30 selects the angle-of-view conversion mode based on the angle-of-view conversion table 41, and the up-converter 72 selects the decompressed SD video material as the selected image. HD video material is output after up-conversion in the corner conversion mode.

Next, the operation of the video server 100 configured as described above will be described. FIG. 3 is a flowchart showing the procedure and contents of a video material sending operation in the video server 100 shown in FIG.
The video server 100 accepts a material playback instruction for sending 16: 9 HD video material for SD broadcasting (step S31). The video server 100 reads the video material corresponding to this instruction from the data memory 40 and decompresses it by the HD decoder 51 (step S32). The ancillary reader 61 reads the view angle information from the expanded ancillary area of the video material (step S33), and determines whether or not the view angle conversion is necessary based on the read view angle information (step S34). If it is determined in this determination that angle of view conversion is not required, the ancillary reader 61 proceeds to step S37 and outputs the expanded HD video material as it is for HD broadcasting.

  On the other hand, if it is determined in step S34 that the angle of view conversion is necessary, the ancillary reader 61 notifies the angle of view conversion unit 30 of the read angle of view information. The angle-of-view conversion unit 30 refers to the angle-of-view conversion table 41, selects a conversion mode based on the notified angle-of-view information (step S35), and notifies the downconverter 71 of the selected conversion mode. The down-converter 71 performs angle-of-view conversion on the SD video material in the selected conversion mode (step S36), and outputs the converted SD video material as playback video for SD broadcasting (step S37).

  As described above, in the above embodiment, the angle-of-view information of the video material is recorded by being inserted into the ancillary area of the material. Also, the conversion mode for each field angle information of the video material is registered in the field angle conversion table 41. Then, when sending the video material, the angle of view information is extracted from the ancillary area of the video material, and the corresponding conversion mode is selected from the angle of view conversion table 41 based on the extracted angle of view information. The angle of view is converted.

  Therefore, according to the above-described embodiment, for example, when HD video material is transmitted for SD broadcasting, it is possible to broadcast at an appropriate angle of view without lack of video or appearance.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the angle-of-view information of the video material is configured to be inserted into the ancillary area of each material by the ancillary inserters 11 and 12, but a separate database is constructed to associate the video material with each information. May be configured to be stored and managed. In addition, the configuration and operation of the video server 100 can be variously modified and implemented without departing from the gist of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The functional block diagram which shows one Embodiment of the video server which concerns on this invention. The figure which shows an example of a view angle conversion of 16: 9 material. The flowchart which shows the procedure of the video material transmission operation | movement in the video server shown in FIG. 1, and its content.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Video server 11, 12 ... Ancillary inserter, 21 ... HD encoder, 22 ... SD encoder, 30 ... View angle conversion part, 40 ... Data memory, 41 ... View angle conversion table, 51 ... HD decoder, 52 ... SD Decoder, 61, 62 ... ancillary reader, 71 ... down converter, 72 ... up converter.

Claims (2)

Multiple high-definition (HD) images that are either the first angle of view that enables the entire wide screen or the second angle of view that adds an invalid area to both sides of the standard screen to create a wide screen HD storage means for storing materials;
Inserting means for inserting the angle-of-view information into an ancillary area added to the HD video material when the HD video material is stored in the HD storage means;
A first conversion mode for converting the HD video material of the first angle of view into a standard definition (SD) video material in a letterbox format that displays the entire wide screen at the center of the standard screen; Storage means for storing an angle-of-view conversion table that registers a second conversion mode for converting a corner HD video material into a side-cut SD video material that cuts both sides of a wide screen to a standard screen size;
In response to an instruction to designate the HD video material stored in the HD storage means and send it for SD broadcasting, the corresponding HD video material is read out from the HD storage means and the angle of view information from the ancillary area of the material HD / SD for extracting the HD video material to the SD video material according to the conversion mode, selecting a corresponding conversion mode from the view angle conversion table based on the extracted angle of view information Conversion means;
A video server comprising: sending means for sending the SD video material converted by the HD / SD conversion means. Accumulating multiple HD video materials that are either the first angle of view that enables the entire wide screen, or the second angle of view that adds an invalid area to both sides of the standard screen to make the wide screen,
When storing the HD video material, the angle of view information is inserted into an ancillary area added to the HD video material,
A first conversion mode for converting the HD video material of the first angle of view into a letterbox format SD video material that displays the entire wide screen at the center of a standard screen; and the HD video material of the second angle of view. Stores an angle-of-view conversion table that registers a second conversion mode for converting to a side-cut SD video material that cuts both sides of a wide screen to a standard screen size,
In response to an instruction to designate the stored HD video material and send it for SD broadcast, the corresponding HD video material is read from the stored HD video material and the angle of view information is read from the ancillary area of the material. Extracting , selecting a corresponding conversion mode from the angle-of-view conversion table based on the extracted angle-of-view information, converting the read HD video material into an SD video material according to the conversion mode,
An angle-of-view conversion method for a video server, wherein the converted SD video material is transmitted.

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