JP4655065B2 - Content distribution system, content distribution system distribution server and display terminal, and content distribution program - Google Patents

Description

  The present invention relates to a system for distributing video content from a distribution server to a user's display terminal via a transmission line, and in particular, a content distribution system for distributing to a display terminal having a narrow display unit such as a mobile communication terminal and the distribution thereof The present invention relates to a server, a display terminal, and a content distribution program.

  FIG. 13 is a block diagram showing a configuration of a conventional video distribution system, in which video content is distributed from a video distribution server 60 that distributes video via a transmission path 30, and the video display terminal 70 of the user receives the video content. Receive and present.

  Also, in Japanese Patent Laid-Open No. 2000-324416, telop information is extracted from a received television broadcast in a television receiver, and is transmitted to a still image display terminal such as a remote control terminal for display. Technologies that show image quality have been proposed.

  The telop information often contains information important for understanding the story and content when watching video, such as news program telop, movie subtitles, etc. Presenting is effective.

  Although not included in the above-mentioned prior art, not only telop information but also character information other than telop existing in general scenes such as product names written on commercial products, signs of signs of drama, signs and signs, etc. It is also useful to extract.

  The subject of the prior art disclosed in the above Japanese Patent Laid-Open No. 2000-324416 is a general television broadcast, but recently, due to the speeding up of the Internet, particularly the speeding up of wireless communication, It has become possible to see accumulated video clips such as movie advertisements and music promotion videos. In addition, live video distribution such as the distribution of video from a camera installed on a sightseeing spot or road, such as a Web camera, is also performed.

  In order to distribute such video as it is, a very wide-band communication channel is required, but the amount of information can be reduced by image compression coding technology. For example, even on the Internet having a bandwidth of about 64 kbps, it is possible to view the video by distributing the compressed video and decoding it with a terminal that receives the compressed video.

  However, in order to transmit a video at a low bit rate of about 64 kbps, the video is encoded by reducing the resolution of the video or the quality of the video, and the encoded video is transmitted to a portable terminal or a home PC. . If the resolution is lowered or the image quality is lowered as described above, the character information included in the video becomes unclear and becomes very difficult to read.

As described above, the text information includes information important for video viewing. However, if the text information becomes difficult to read, video viewing may be hindered.
JP 2000-324416 A

  As described above, the conventional techniques have the following problems.

  Conventionally, when distributing video content at a low bit rate, there has been no technology that extracts text information including telop information, encodes and distributes it with high image quality, and displays it on the user's terminal . For example, in the prior art disclosed in Japanese Patent Laid-Open No. 2000-324416, a telop is extracted from a received general television broadcast. However, for video content distributed at a low bit rate reproduced by a mobile communication terminal or the like, text has already been written. Telop extraction could not be performed because is distributed in an unclear state.

  An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and even for video content distributed at a low bit rate, content distribution that can be displayed to the user by the display terminal on the receiving side clearly displaying characters To provide a system, its distribution server, display terminal, and content distribution program.

According to a first aspect of the content distribution system of the present invention, in the content distribution system that distributes video content from a distribution server to a display terminal, the distribution server detects an area in which characters are displayed from an image of the video content, An image in which the contrast of the detected image of the region is increased is generated as character information of the video content, and the generated character information is distributed to the display terminal simultaneously with the video content, and the display terminal is connected to the distribution server. The character information of the video content received from the video content is presented together with the video content received simultaneously.

According to a second aspect of the content distribution system of the present invention, in the content distribution system that distributes video content from the distribution server to the display terminal, the distribution server detects an area in which characters are displayed from an image of the video content, Increasing the bit rate of the image of the detected area and generating an image with improved image quality as character information of the video content, and simultaneously distributing the generated character information to the display terminal simultaneously with the video content, The display terminal presents the character information of the video content received from the distribution server together with the video content received simultaneously.

According to a third aspect of the content distribution system of the present invention, in the content distribution system that distributes video content from the distribution server to the display terminal, the distribution server detects an area in which characters are displayed from an image of the video content, An image obtained by encoding the detected image of the region by another encoding method is generated as character information of the video content, and simultaneously with the video content, the generated character information is distributed to the display terminal, and the display terminal The character information of the video content received from the distribution server is presented together with the video content received simultaneously.

According to a first aspect of the distribution server of the present invention, in the distribution server that distributes the content to the display terminal, the means for detecting an area where characters are displayed from the image of the video content, and the video content from the detected area A means for generating character information; and a means for delivering the video content to the display terminal simultaneously with the generated character information. The means for generating the character information is a text of the character indicated in the detected area. Data is acquired by character recognition, and a translated sentence obtained by translating the text data acquired by character recognition into a specified language is generated as character information of the video content.

According to a second aspect of the distribution server of the present invention, in the distribution server that distributes the content to the display terminal, the means for detecting an area where characters are displayed from the image of the video content, and the video content from the detected area A means for generating character information; and a means for distributing the video content to the display terminal simultaneously with the generated character information. The means for generating the character information increases the contrast of the detected image in the region. The generated image is generated as character information of the video content.

According to a third aspect of the distribution server of the present invention, in the distribution server that distributes the content to the display terminal, the means for detecting an area in which characters are displayed from the image of the video content, and the video content from the detected area And a means for generating character information, and a means for delivering the video content to the display terminal simultaneously with the generated character information. The means for generating the character information binarizes the image of the detected area. The generated image is generated as character information of the video content.

According to a fourth aspect of the distribution server of the present invention, in the distribution server that distributes the content to the display terminal, the means for detecting an area in which characters are displayed from the image of the video content, and the video content from the detected area And a means for generating character information, and a means for distributing the video content to the display terminal simultaneously with the generated character information. The means for generating the character information sets the bit rate of the image of the detected area. An image having a high image quality and a high image quality is generated as character information of the video content.

According to a fifth aspect of the distribution server of the present invention, in the distribution server that distributes the content to the display terminal, the means for detecting an area where characters are displayed from the image of the video content, and the video content from the detected area Means for generating character information; and means for distributing the video content to the display terminal simultaneously with the generated character information, wherein the means for generating the character information uses a different code for the detected image of the region. A distribution server characterized in that an image encoded by an encoding method is generated as character information of the video content.

According to a first aspect of the display terminal of the present invention, the distribution server receives from the distribution server the character information generated separately from the video content from the characters displayed on the video content image and the video content at the same time. Means for presenting both the character information and the video content, wherein the character information of the video content includes character auxiliary information indicating characteristics of the area and characters detected from the video content, and is received from the distribution server; And a means for presenting the character information of the video content based on the character auxiliary information included in the character information.

  As described above, according to the present invention, even for video content distributed at a low bit rate, character information is extracted from the video content by the distribution server, and is separated from the video content with text data and high-quality code. By distributing with an image encoded using the conversion method, the contents of the video content can be presented to the user in an easy-to-understand manner.

  For this reason, the display terminal does not require processing ability to perform character extraction, and even in a display terminal with a narrow display screen such as a mobile communication terminal, the characters in the video content can be clearly displayed. The contents of video content can be presented to the user in an easy-to-understand manner.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the content distribution system according to the first embodiment of the present invention, and also shows the configuration of the distribution server 10 and the display terminal 20 of the present embodiment.

  Referring to FIG. 1, a distribution server 10 according to the present embodiment is realized by a program-controlled CPU or the like, and includes a video input unit 11, a video encoding unit 12, a character extraction unit 13, a video transmission unit 14, and a character transmission unit. 15 is provided. The display terminal 20 of the present embodiment is realized by a program-controlled CPU or the like, and includes a video receiving unit 21, a video decoding unit 22, a video display unit 23, a character receiving unit 24, a character decoding unit 25, and a character display unit 26. I have.

  The video content targeted by the distribution server 10 may be a live content such as a television broadcast, or a video content that has already been encoded and stored, such as a preview video of a movie.

  The transmission path 30 connecting the distribution server 10 and the display terminal 20 is not particularly limited, but here it is assumed to be used on a general wireless line such as a mobile phone or PHS, or a general telephone line such as ISDN, and is about 64 kbps to 384 kbps. A case will be described as an example.

  FIG. 2 is a flowchart for explaining the operation of the distribution server 10 of the present embodiment, and FIG. 3 is a flowchart for explaining the operation of the display terminal 20 of the present embodiment.

  The distribution server 10 according to the present embodiment receives video content in the video input unit 11 (step 201), detects a region (character region) where characters are displayed in the video content by the character extraction unit 13, and Character information used to confirm the character is generated (step 202). Then, the video content is encoded by the video encoding unit 12 (step 203), the video transmission unit 14 transmits the encoded video content to the display terminal 20, and at the same time, the character transmission unit 15 transmits the character information to the display terminal 20. (Step 204).

  The display terminal 20 receives the video information (video content) transmitted from the distribution server 10 by the video receiving unit 21 and the character information by the character receiving unit 24 (step 301). Then, the video decoding unit 22 decodes the video content, and the character decoding unit 25 decodes the character information (step 302). Then, the video content is displayed on the video display unit 23, the character information is displayed on the character display unit 26, and these are presented to the user (step 303). Thereby, the user of the display terminal 20 can see video information and character information.

  In the present embodiment, the common transmission path 30 is used as a transmission path for transmitting video content and text information from the distribution server 10 to the display terminal 20, but the method is limited to the common transmission path 30. do not have to. For example, in addition to the method of transmitting video content and text information using packet switching of the same mobile phone, only text information should be transmitted using mobile phone packet switching, and video content should be transmitted using mobile phone line switching. Is also possible.

  Here, when video content and character information are distributed through different transmission paths, the video content is viewed on a terminal such as a videophone, but the character information is received on the Internet. it can.

  Further, when distributing video content and character information through a common transmission line 30, a method of multiplexing and distributing video content and character information as shown in the second embodiment of the present invention is adopted. Can do.

  FIG. 4 is a block diagram showing a configuration of a content distribution system according to the second embodiment of the present invention. In the present embodiment, the distribution server 10a includes a multiplexing unit 16 and a transmission unit 17 instead of the video transmission unit 14 and the character transmission unit 15 of the first embodiment, and the display terminal 20a performs the first implementation. The receiving unit 27 and the demultiplexing unit 28 are provided instead of the video receiving unit 21 and the character receiving unit 24 of the form.

  FIG. 5 is a flowchart for explaining the operation of the distribution server 10a of the present embodiment, and FIG. 6 is a flowchart for explaining the operation of the display terminal 20a of the present embodiment.

  Referring to FIGS. 5 and 6, the difference between the operation of the present embodiment and the first embodiment is that the distribution server 10 a extracts the video content encoded by the video encoding unit 12 and the character extraction unit 13. The multiplexed character information is multiplexed by the multiplexing unit 16 (step 404), and the transmission unit 17 transmits the multiplexed content by the display terminal 20a (step 405). The display terminal 20a separates the multiplexed content received by the receiving unit 27 (step 501) into video content and character information by the demultiplexing unit 28 (step 502), and the separated video content and character information. These are different in that they are decoded and displayed (steps 503 and 504).

  As a method of multiplexing, H.264, which is a standard for making a videophone call defined by ITU-T. It is possible to multiplex video and audio information and text information using 324 / M or the like.

  In addition, here, the video content obtained by reading live video or stored video is input to the video input unit 11 and distributed. However, the results processed by the video encoding unit 12 and the character extraction unit 13 are accumulated, A method of reading out the stored video content when requested by the user can be similarly implemented.

  Next, with reference to FIG. 7, a description will be given of a method in which the distribution server 10a distributes the character information generated from the video content and the video content and displays them on the display terminal 20a. The description here applies not only to the second embodiment but also to the first embodiment.

  FIG. 7 shows a scene in which a user is watching a news program. In the original image of (1) in FIG. 7, a news program is superimposed with an announcer video and a telop indicating a news headline. ing.

  Here, we will explain telop information as text information. However, the same applies to general text such as signboard characters in video scenes that are not telop, as well as text that has been multiplexed on video by data broadcasting or text broadcasting. Can be targeted.

  The display screen 20-3a in FIG. 7 shows an example of display on the display terminal 20a when the video is encoded and transmitted as it is as in the prior art.

  Here, the transmission path 30 is a transmission path 30 with a low bit rate of about 64 kbps to 384 kbps. In order to transmit a video encoded using such a transmission path 30 with a low bit rate, the following (1 It is necessary to use an encoding method such as (2). (1) Decrease the resolution of the input video and encode it. (2) Decrease the bit rate required for encoding and degrade the image quality.

  Usually, television news video telops are premised on viewing at television resolution (eg, 720 × 480), so QCIF (176 × 144) and CIF (352 ×) often used for video distribution on mobile phones. If the resolution is reduced to 288), the characters become smaller or crushed and become very difficult to read.

  Further, when the image quality is deteriorated, the contrast is usually lowered and the characters become unclear. For example, in the MPEG of the ISO standard, video is divided into blocks and encoding is performed in units of blocks. Therefore, if the image quality is deteriorated, the boundaries between the blocks become conspicuous, and the contrast in the blocks also decreases. For this reason, even in a portion that requires a clear contrast such as a telop character, it becomes difficult to read the character due to the low contrast.

  Although FIG. 7 shows a usage image for viewing video on a mobile phone, this is not a problem that occurs only on a mobile phone with a narrow display screen, and video distribution is performed using a low-bit-rate transmission path 30. At times, any display terminal 20a can be a problem.

  This problem can be considered as a problem caused by simultaneously handling a natural image such as a person and artificial character information when encoding at a low bit rate. Therefore, in the first and second embodiments of the present invention, the video content is not transmitted as it is, but characters are extracted from the video content image in the distribution servers 10 and 10a as shown in (2) of FIG. Is detected, information (character information) used for confirming the displayed character is generated, and the character information is distributed to the display terminals 20 and 20a together with the video content.

  That is, the video content is transmitted as the original image as in the conventional case of the display screen 20-3a, but in this embodiment (and the first embodiment), the characters in the character area are confirmed. The information (character information) used for is encoded and transmitted using a method different from that for video content.

  For example, character recognition can be performed on the extracted image of the character area, text data of the displayed characters can be acquired, and each character can be indicated by numerical information (character code) such as an ASCII code and transmitted. . The display screen 20-3b is an example of the display of the display terminal 20a when transmitted separately in this way.

  By transmitting text data (character code), the amount of communication is reduced, and the display terminal 20a can display an arbitrary size, so that it can be displayed in a large size for easy reading.

  This character recognition processing can be performed using a technique used in currently sold OCR software or the like, or other conventional techniques.

  In addition, when character recognition technology is used as described above, character recognition is often mistaken in automatic character recognition processing, so characters are displayed as character information instead of text data obtained by character recognition. A method of transmitting an image of a character area is also effective.

  In this case, the entire image has a low resolution, but only the extracted character region portion is encoded at a high resolution and transmitted, so that it can be displayed in an easy-to-read manner as shown in the display screen 20-3c in FIG. it can. On the display screen 20-3c of FIG. 7, a high-resolution video of the character area is displayed below the entire video content.

  In addition, since normal telop information often flows the same telop for a few seconds so that people can read it, this can be used to send new text information only when the telop information changes. Control can be performed. If an image encoded at a high resolution is transmitted as it is, the capacity of the transmission path 30 will be reduced. In this way, by reducing the transmission frequency and transmitting the image of the character area, the band can be reduced. Can do.

  Also, instead of transmitting the extracted color image of the character area as it is, the image is binarized, the character is black, the background is white, etc. Thus, the transmission amount can be further reduced.

  Thus, in order to encode the character area with high resolution, MPEG or the like, which is a moving image encoding method, can be used. Still further, JPEG or JPEG2000, which are encoding methods for still images, can be used, and encoding methods such as JBIG can be used for binary images.

  The character extraction unit 13 according to the present embodiment extracts a character area. As a method for extracting the character area, a conventionally implemented technique can be used.

  For example, since the telop information has the characteristics as shown in the following (1) to (3), extraction can be performed using such characteristics. (1) Many white characters are used. (2) There is little movement. (3) Characters do not appear independently but multiple characters are grouped.

  The character extraction unit 13 can extract not only the character area and character recognition of the character area but also extract the position of the character area in the video and analyze the document layout structure of the character area. The extraction unit 13 can extract the position of the character area, the layout structure, and the like, and can be transmitted by the character transmission unit 15.

  Such a position of the character area in the video content and the layout structure of the character area are referred to as character auxiliary information. The character information includes character auxiliary information in addition to the above-described image (video) of the character area, text data acquired by character recognition, and the like.

  The above is the explanation regarding the extraction of the telop information and the character information in the video scene. However, when characters such as data broadcasting are multiplexed on the video, such processing is not necessary, and the character extraction unit 13 A method of extracting text data by separating character information multiplexed in data broadcasting or the like is also possible.

  In FIG. 7, it has been explained that the user can clearly read the character information by transmitting the character information and the video information separately, but FIG. 8 shows a method of presenting the character information to the user. .

  The display screen 20-4a in FIG. 8 is a case where a normal image is displayed in the same manner as in the past without displaying character information or the like. In this state, no information other than video content is presented to the user. Further, conventionally, as shown on the display screen 20-4b, by displaying general information such as a channel number of a video being displayed and a program name (using text broadcasting or the like), a user can be displayed. There is a conventional technique that makes it possible to understand what is watching. The display terminal 20a of the present embodiment normally performs display such as the display screen 20-4a and the display screen 20-4b.

  Here, when the user feels that the character information such as a telop is unclear, the character information is received from the distribution server 10a and displayed separately from the video content.

  Further, the display terminal 20a may be configured to always receive the character information transmitted from the distribution server 10a. However, here, the present embodiment does not normally receive the character information in order to save bandwidth. A description will be given of a method in which a character information transmission request is issued to the distribution server 10a only when necessary, and character information is received.

  The display terminal 20a issues a character information request to the distribution server 10a, thereby accepting distribution of the character information in the video from the distribution server 10a and displaying the character information.

  The character information may be transmitted as text data obtained by character recognition or the like, or may be transmitted as a high-quality image, and may be properly used depending on the capability of the distribution server 10a. It may be possible to select whether the result of character recognition or the image is desired as if a request for transmission is sent to the distribution server 10a.

  The display screen 20-4c is a display example when the received character information is recognized and transmitted as text data, and the character information is displayed next to the video content. Further, when program information or the like is displayed as in the display screen 20-4b, the program information or the like and character information can be switched and displayed, so that even a narrow screen can be used efficiently.

  On the display screen 20-4c, since the character information is short, the video information and the character information can be displayed in a tiled manner. However, if the character information is long, the character is displayed in the vertical direction, the horizontal direction, or You may scroll and display both.

  Further, instead of arranging them in a tile shape as in the display screen 20-4c, they may be arranged so that part of the character information overlaps on the video. Further, when the position of the character information in the video is received as the auxiliary character information from the distribution server 10a, the character information is displayed superimposed on the position of the original video as shown on the display screen 20-4f. You can also

  Next, processing when the distribution server 10a detects a plurality of areas where characters are displayed in the video content will be described.

  In this case, the distribution server 10a can distribute all the character information in the detected video content to the display terminal 20a, but also distributes only the character information in the area designated by the user. It is also possible to do this.

  An example of the operation in this case will be described. The distribution server 10a transmits to the display terminal 20a including character auxiliary information such as layout information of characters and sentences in each region and position information of each detected region. Then, on the display terminal 20a, using the character auxiliary information, the user selects a region where the user wants to see the character information and notifies the distribution server 10a of the region. And the delivery server 10a produces | generates character information from the area | region which the user notified from the display terminal 20a selected, and delivers to the display terminal 20a.

  Further, even when there is no character auxiliary information, it is possible to use a method in which the display terminal 20a instructs the distribution server 10a to switch the character information, sequentially switches, and selects the content by referring to the contents of each character information. .

  In this way, the distribution server 10a does not distribute all the character information to the display terminal 20a, but transmits character information such as the character information that the user wants to see notified from the display terminal 20a and an instruction to switch the character information to be distributed. It is possible to deliver only the requested character information in the video content based on the request.

  In this case, the distribution server 10a may first distribute the character information of the character area first detected from the image of the video content to the display terminal 20a, and first display it on the display terminal 20a. The distribution order may be determined based on the position displayed in the video content and the content of character information obtained as a result of character recognition.

  For example, text written horizontally in the lower center of video content is likely to be a telop, so the text information is distributed with the highest priority, and conversely, it is narrow in the left or right corner at the top of the video content. Since the character indicated by the range is likely to be the display of the current time and its importance is low, it is conceivable that other character information is preferentially distributed.

  In addition, a method in which the distribution server 10a distributes all the character information to the display terminal 20a and selects the character information to be displayed on the display terminal 20a side is also possible.

  Further, as shown in the display screen 20-4d, the distribution server 10a automatically translates the text data of the character information recognized for the character into another designated language, and the translated sentence is displayed as character information on the display terminal 20a. It can also be distributed and displayed.

  This automatic translation can translate between various languages such as Japanese to English or English to Japanese shown on the display screen 20-4d by using a conventional technique in translation software or the like. By automatically translating and distributing character information extracted in this way, a service for providing video contents in various languages is simplified. The display method for displaying the translation is the same as in the display screen 20-4c.

  Next, as shown in the display screen 20-4e, when the distribution server 10a distributes the character information as an image (video) in the area where the character is displayed, the video content and the content are displayed in the same manner as the display screen 20-4c. Can display character information in a separate window.

  When a character information image larger than the screen size is distributed, the display terminal 20a displays the image of the character information in a reduced size, or enlarges it in the vertical direction or the horizontal direction to view details. It is possible to display by scrolling.

  In addition, if the character information includes auxiliary character information such as layout information, the display terminal 20a can use this to regenerate and present the image of the character area so that it can be easily read. is there.

  In addition, as shown in the display screen 20-4f, even when character information is distributed as an image, the character information image is not displayed in a region separate from the video content, but is displayed superimposed on the same region as the video. Can be made. In particular, by displaying the character information so as to overlap the character area of the original video content, it is possible to display the character information image in an easy-to-read manner.

  Since the character information image to be distributed usually has a higher resolution than the original video content, as in the case of the previous display screen 20-4e, the image of the character information distributed is initially reduced to the original. The video content can be displayed superimposed on the video content, and if necessary, the reduction can be canceled (or the size can be changed to a specified size) and the content can be displayed while scrolling.

  As shown in the display screen 20-4g, the character information recognized as characters and translated into another language can be displayed in a window different from the video content. In addition, it can be displayed superimposed on the video content.

  This can be applied to subtitles of video content of foreign movies, and when you want to concentrate on a movie, you will not lose your focus by looking at other windows. In order to achieve this, the text information of the translated text distributed as text data may be superimposed on the video as it is, or a text image is created from the text data of the translated text according to the size of the text area. It is possible to display it.

  In addition, instead of distributing the result of character recognition by the distribution server 10a as text data, it is also possible to generate a character image that displays characters of the text data and distribute it as character information to the display terminal 20a. is there. In this case, the display terminal 20a can display characters clearly only by superimposing and displaying the received character information image.

  There is also a demand for deleting subtitles to be displayed on video content, particularly in the case of video content for language learning or foreign movies.

  In this case, as shown in the display screen 20-4h, the display terminal 20a erases the area based on the position information of the area where the character in the video content indicated in the distributed character auxiliary information is displayed. Can be provided to users.

  In this case, when the user wants to know the answer while studying the language, the display terminal 20a displays the character information by a method such as the display screens 20-4c to 20-4g according to the operation of the user. It can be displayed, erased, or presented to the user while switching.

  In the description of the video content and text information presentation method according to the first and second embodiments, the case where the display terminals 20 and 20a are mobile communication terminals such as mobile phones has been described as an example. In particular, it is not necessary to limit the display terminal 20a to a mobile phone. The content distribution system of the present invention is particularly effective when the display terminals 20 and 20a of the distribution destination have a small area of the display unit, but can also be distributed to terminals such as personal computers and laptop computers in the same manner. is there.

  As described above, according to the content distribution systems of the first and second embodiments, the display terminal on the receiving side clearly displays and uses the video content distributed at a low bit rate. Can be presented to the person.

  Next, a third embodiment of the present invention will be described. FIG. 9 is a block diagram showing a configuration of a content distribution system according to the third embodiment of the present invention. In the present embodiment, character information is extracted and displayed only on the display terminal 20b without using the distribution server 10.

  FIG. 10 is a flowchart for explaining the operation of the display terminal 20b of the present embodiment.

  The display terminal 20b according to the present embodiment is a mobile terminal that receives broadcast video such as television broadcast, and the video receiver 21 receives video content such as a TV program being broadcast from an external broadcasting station 40 or the like by radio waves or the like. (Step 601). The received video content is decoded by the video decoding unit 22 (step 602), the character information is generated by the character extraction unit 29 (step 603), and the video content and its character information are displayed by the video display unit 23 (step 603). 604).

  Since the display terminal 20b is intended to be portable, the resolution that can be displayed is low, and the video display unit 23 displays the video content in a reduced size. At this time, in the reduced video content, characters such as telop may become unclear or crushed.

  On the other hand, since the video decoded by the video decoding unit 22 is decoded at the normal resolution, the character extraction unit 29 extracts the character area using the normal resolution video, and the character display unit 26 detects the character information. By displaying, the video content is presented to the user in an easy-to-understand manner. The character extraction unit 29 can not only extract a character region but also perform character recognition and acquire text data of a displayed character. In this case, the acquired text data is displayed by the character display unit 26.

  The display method of the character information of the display terminal 20b according to the present embodiment can be performed in the same manner as described in the first and second embodiments.

  As described above, according to the present embodiment, when the display terminal 20b has sufficient processing capability to perform character extraction, the display terminal 20b itself does not require a distribution server, and the television broadcast or the like. The character information can be extracted from the video content and the extracted character information can be displayed with high resolution. As a result, similar to the display terminals 20 and 20a of the first and second embodiments, the contents of the video content can be presented to the user in an easy-to-understand manner on the small-screen display terminal 20b such as a portable terminal. .

  Next, a fourth embodiment of the present invention will be described. FIG. 11 is a block diagram showing a configuration of a content distribution system according to the fourth embodiment of the present invention.

  In the third embodiment, the video is directly received by the display terminal 20b and the character area extraction is also performed by the display terminal 20b. However, since the portable device generally has low processing capability, it is difficult to extract the character area. There may be cases.

  FIG. 12 is a flowchart for explaining the operation of the distribution server 10b of the present embodiment.

  Therefore, in the present embodiment, the video input unit 11 receives the video content of the same program as the program received by the display terminal 20c from the external broadcasting station 40 in the distribution server 10c (step 701), and the character extraction unit 13 The character information is extracted (step 702), and the character transmission unit 15 transmits the character information to the display terminal 20c (step 703). In the display terminal 20c, as in the first and second embodiments, the character information distributed from the distribution server 10c is received by the character receiving unit 24, and the necessary decoding process is performed by the character decoding unit 25. Character information is displayed on the display unit 26.

  On the other hand, the video content is received by the video receiving unit 21 from the broadcasting station 40 other than the distribution server 10c as in the third embodiment, and the video decoding unit 22 performs the necessary decoding processing, and the video display unit 23 To display the video content.

  The display method of the character information of the display terminal 20c of the present embodiment can be performed in the same manner as described in the first and second embodiments.

  As described above, according to the present embodiment, in addition to the effects of the third embodiment, it is possible to display character information even on the display terminal 20c where the character region extraction process is difficult. Further, the distribution server 10 distributes only character information, and the display terminal 20c receives the video content from other broadcast stations 40 and the like, thereby providing the same effects as the content distribution systems of the first and second embodiments. Can be realized.

  In addition, by receiving video using direct radio waves or the like without receiving video information with a large amount of normal data from the distribution server 10c, the cost required for data communication can be reduced. Character information can be distributed more efficiently than in the embodiment.

  In each of the above embodiments, the display terminals 20, 20a, 20b, and 20c display the video content and its character information at the same time. However, only the character information is displayed and the video content is not displayed. Is also possible. Thereby, the character information of the video content can be displayed with a smaller communication amount.

  The content distribution system of each of the above embodiments includes the video input unit 11, the video encoding unit 12, the character extraction unit 13, the video transmission unit 14, the character transmission unit 15, and the multiplexing unit in the distribution servers 10, 10a, and 10c. 16, the function of the transmission unit 17, the video reception unit 21, the video decoding unit 22, the video display unit 23, the character reception unit 24, the character decoding unit 25, the character display unit 26, the reception in the display terminals 20, 20a, 20b, and 20c. The contents distribution programs 90, 90a, 90c, 91, which are computer programs having the respective functions, as well as the functions of the unit 27, the demultiplexing unit 28, the character extraction unit 29, and other functions are realized in hardware. , 91a, 91b, 91c can be realized by being loaded into the memory of the computer processing apparatus. The content distribution programs 90, 90a, 90c, 91, 91a, 91b, 91c are stored in a magnetic disk, a semiconductor memory, or other recording media. Each function described above is realized by being loaded from the recording medium into the computer processing apparatus and controlling the operation of the computer processing apparatus.

  Although the present invention has been described with reference to the preferred embodiments and examples, the present invention is not necessarily limited to the above-described embodiments and examples, and various modifications can be made within the scope of the technical idea. Can be implemented.

It is a block diagram which shows the structure of the content delivery system by the 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the delivery server of the 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the display terminal of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the content delivery system by the 2nd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the delivery server of the 2nd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the display terminal of the 2nd Embodiment of this invention. It is explanatory drawing of the character region part extraction of the 2nd Embodiment of this invention. It is explanatory drawing of the video display system in the display terminal of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the content delivery system by the 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the display terminal of the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the content delivery system by the 4th Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the delivery server of the 4th Embodiment of this invention. It is a block diagram which shows the structure of the conventional video content delivery system.

Explanation of symbols

10, 10a, 10c Distribution server 11 Video input unit 12 Video encoding unit 13 Character extraction unit 14 Video transmission unit 15 Character transmission unit 16 Multiplexing unit 17 Transmission units 20, 20a, 20b, 20c Display terminal 21 Video reception unit 22 Video Decoding unit 23 Video display unit 24 Character reception unit 25 Character decoding unit 26 Character display unit 27 Reception unit 28 Demultiplexing unit 29 Character extraction unit 30 Transmission path 60 Video distribution server 61 Video input unit 62 Video encoding unit 64 Video transmission unit 70 Video display terminal 71 Video receiving unit 72 Video decoding unit 73 Video display units 90, 90a, 90c, 91, 91a, 91b, 91c Distribution program

Claims (25)

In a content distribution system that distributes video content from a distribution server to a display terminal,
The distribution server detects an area where characters are displayed from the image of the video content, generates an image with increased contrast of the detected image of the area as character information of the video content, and simultaneously with the video content, Deliver the generated character information to the display terminal,
The content distribution system, wherein the display terminal presents the character information of the video content received from the distribution server together with the video content received simultaneously.
The content distribution system according to claim 1 , wherein the image with the increased contrast is an image obtained by binarizing the detected image of the region.
In a content distribution system that distributes video content from a distribution server to a display terminal,
  The distribution server detects an area where characters are displayed from an image of video content, increases the bit rate of the detected image of the area, and generates an image with improved image quality as character information of the video content, Simultaneously with the video content, the generated character information is distributed to the display terminal,
  The content distribution system, wherein the display terminal presents the character information of the video content received from the distribution server together with the video content received simultaneously.
In a content distribution system that distributes video content from a distribution server to a display terminal,
  The distribution server detects an area where characters are displayed from an image of video content, generates an image obtained by encoding the detected image of the area with another encoding method as character information of the video content, and Simultaneously with the video content, the generated text information is distributed to the display terminal,
  The content distribution system, wherein the display terminal presents the character information of the video content received from the distribution server together with the video content received simultaneously.
When a plurality of areas in which characters are displayed are detected from the image of the video content, the distribution server accepts designation of the area from the display terminal, and the character information generated by the designated area is content delivery system according to any one of claims 1 to 4, characterized in that the delivery to the display terminal.
The content distribution according to any one of claims 1 to 5 , wherein the distribution server multiplexes the character information of the video content and the video content and distributes the multiplexed information to the display terminal. system.
The said display terminal receives the character information of the said video content received from an external broadcasting station from the said delivery server, and presents the character information of the said video content with the said video content. Item 7. The content distribution system according to any one of Items 6 to 6 .
As the character information of the video content, in addition to the character information generated separately from the video content, the detected region, the character auxiliary information indicating the character characteristics are included at the same time,
The display terminal, the character information of the video content received from the distribution server, any of claims 1 to 7, characterized in that presented on the basis of the character auxiliary information included in the character information 1 Content distribution system described in 1.
The content distribution system according to claim 8 , wherein the text auxiliary information of the video content includes information on a position in the image of the region detected from the image of the video content.
The content distribution system according to claim 8 or 9 , wherein the character auxiliary information of the video content includes information on a layout structure of characters displayed on the image of the video content.
In a distribution server that distributes content to display terminals,
Means for detecting an area in which characters are displayed from an image of video content;
Means for generating character information separately from the video content from the detected area;
Means for delivering the video content to the display terminal simultaneously with the generated character information;
The means for generating the character information obtains the text data of the character indicated in the detected area by character recognition, and translates the text data obtained by the character recognition into a specified language as the video. A distribution server that generates character information of content .
In a distribution server that distributes content to display terminals,
  Means for detecting an area where characters are displayed from an image of video content;
  Means for generating character information separately from the video content from the detected area;
  Means for delivering the video content to the display terminal simultaneously with the generated character information;
  The means for generating the character information generates an image in which the contrast of the detected image of the region is increased as the character information of the video content.
A distribution server characterized by that.
In a distribution server that distributes content to display terminals,
  Means for detecting an area where characters are displayed from an image of video content;
  Means for generating character information separately from the video content from the detected area;
  Means for delivering the video content to the display terminal simultaneously with the generated character information;
  The distribution server characterized in that the means for generating the character information generates an image obtained by binarizing the detected image of the region as the character information of the video content.
In a distribution server that distributes content to display terminals,
  Means for detecting an area where characters are displayed from an image of video content;
  Means for generating character information separately from the video content from the detected area;
  Means for delivering the video content to the display terminal simultaneously with the generated character information;
  The means for generating the character information increases the bit rate of the image of the detected area and generates an image with improved image quality as the character information of the video content.
A distribution server characterized by that.
In a distribution server that distributes content to display terminals,
  Means for detecting an area where characters are displayed from an image of video content;
  Means for generating character information separately from the video content from the detected area;
  Means for delivering the video content to the display terminal simultaneously with the generated character information;
The means for generating the character information generates, as character information of the video content, an image obtained by encoding the detected image of the region by another encoding method.
A distribution server characterized by that.
Means for receiving designation of the area from the display terminal when a plurality of areas in which characters are displayed are detected from the image of the video content;
The distribution server according to any one of claims 11 to 15 , wherein character information generated in the designated area is distributed to the display terminal.
The distribution server according to any one of claims 11 to 16 , further comprising means for multiplexing the character information of the video content and the video content and distributing the multiplexed information to the display terminal.
As character information of the video content, in addition to character information generated separately from the video content, the device includes means for identifying the region and character characteristics, and the identified region and character feature information is used as character auxiliary information. The distribution server according to any one of claims 11 to 17 , wherein the distribution server includes the character information of the video content and distributes the image content to the display terminal.
Means for recording the video content and character information of the video content;
The apparatus according to any one of claims 11 to 18 , further comprising means for distributing the requested video content and character information of the video content to the display terminal in response to a request from the display terminal. The delivery server described in.
The character information generated separately from the video content from the characters displayed in the image of the video content from the distribution server according to any one of claims 11 to 19 for distributing the content, and the video content Means for simultaneously receiving
  Means for presenting both the received character information and the video content;
  The character information of the video content includes character auxiliary information indicating characteristics of the region and characters detected from the video content,
  A display terminal comprising: means for presenting character information of the video content received from the distribution server based on the character auxiliary information included in the character information.
The character auxiliary information includes information on a position in the image of an area in which characters in the image of the video content are displayed,
21. The display terminal according to claim 20 , further comprising means for erasing and presenting the video content by deleting an area in which the character indicated by the character auxiliary information is displayed.
The display terminal according to claim 20 or 21 , further comprising means for instructing the delivery server whether the character information can be transmitted.
The display terminal according to any one of claims 20 to 22 , further comprising means for simultaneously displaying the character information of the video content and the video content in separate windows on a display screen.
The display terminal according to any one of claims 20 to 23 , further comprising means for simultaneously displaying character information of the video content in an area for displaying the video content in a display screen.
The display terminal according to any one of claims 20 to 24 , wherein the display terminal is a mobile communication terminal.

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