JP6412893B2 - Video distribution system, video transmission device, communication terminal, and program - Google Patents

Description

  The present invention relates to a moving image distribution system, a moving image transmission device, a communication terminal, and a program.

When distributing moving images, a technique for adaptively distributing moving images of different image quality to communication terminals in various environments with different communication quality has been known (see, for example, Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP 2002-135783 A

  Hereinafter, a problem to be solved by the present invention will be described using an example of a conventional moving image distribution system. FIG. 1 shows an example of a conventional moving image distribution system 40. The moving image distribution system 40 includes a moving image transmission device 50 and a communication terminal 60. The video transmission device 50 receives a video data distribution request from the communication terminal 60, a video data storage unit 53 that stores video data to be distributed, and video data stored in the video data storage unit 53. It is comprised with the moving image data transmission part 54 to transmit. The communication terminal 60 includes a request transmission unit 61 that transmits a distribution request for moving image data to the moving image transmission device 50, and a moving image data reception unit 62 that receives and reproduces the moving image data.

  In the video distribution system 40, in response to the distribution request transmitted by the communication terminal 60, the video transmission device 50 transmits the video data 55 stored in advance in the video data storage unit 53 to the communication terminal 60. The video data 55 received by the data receiving unit 62 is reproduced.

  Since moving image data has a large amount of data, when moving image distribution is performed to communication terminals in various communication quality environments, moving image data that has been encoded in advance and compressed in data amount is used for moving image distribution. Encoded video data has a smaller amount of data, but the image quality is lower than that of the video before encoding. Therefore, when the distributed video data is played back, the characters in the video are difficult to read. There was a case.

  Further, when the communication terminal receives moving image data, the communication terminal in an environment with low communication quality may not be able to obtain a communication band sufficient for receiving the moving image data and may not be able to receive the moving image data. In general, the amount of moving image data is larger as the image quality is higher and lower as the image quality is lower. Therefore, a technique for adaptively distributing moving images having different image quality according to the communication quality of the communication terminal is widespread.

  FIG. 2 shows an example of a moving image distribution system 70 that distributes a plurality of moving image data having different image quality. The moving image distribution system 70 includes a moving image transmission device 80 and a communication terminal 90. The video transmission device 80 includes a request receiving unit 81 that receives a video data distribution request from the communication terminal 90, a video data storage unit 83 that stores video data of a plurality of image quality for one video content, and a video data storage unit 83. And a moving image data transmission unit 84 for transmitting the moving image data stored in the. In this example, it is assumed that high-quality moving image data 85 and low-quality moving image data 86 are stored in the moving image data storage unit 83. The communication terminal 90 includes a request transmission unit 91 that transmits a distribution request for moving image data of any image quality among a plurality of moving image data to the moving image transmission device 80, and a moving image data reception unit 92 that receives and reproduces the moving image data. It consists of.

  In the video distribution system 70, the communication terminal 90 transmits a high-quality or low-quality video data distribution request to the video transmission device 80 according to its own communication quality. In response to the received distribution request, the video transmission device 80 transmits high-quality or low-quality video data stored in the video data storage unit 83 to the communication terminal 90, and the video data reception unit 92 of the communication terminal 90 receives the video data. Play the recorded video data.

  In a moving image distribution system that distributes a plurality of moving image data of different image quality, a communication terminal can receive and reproduce moving image data by distributing moving image data of an image quality corresponding to communication quality. On the other hand, when the communication quality of the communication terminal is low, low-quality moving image data is distributed, and thus characters included in the moving image may be difficult to read.

  As described above, in the conventional video distribution, there is a problem that it is difficult to read characters included in the video when the image quality of the video data is low, and particularly in a communication terminal in an environment with low communication quality, a sufficient communication bandwidth Therefore, there is a problem in that low-quality moving image data in which characters are difficult to read is provided. Therefore, the present invention provides a method for solving the above problems.

  According to the first aspect of the present invention, a video transmission device that distributes video content including a plurality of video data and character data corresponding to the video content, and a communication terminal that receives and displays the video content and character data. A video transmission system comprising: a video data storage unit that stores first video data included in video content, and second video data of video content having lower image quality than the first video data; Character information is extracted from the first moving image data, and the character data generating unit that generates character data based on the character information, the character data, and the first moving image data or the second moving image data from which the character information is extracted are stored in association with each other. A character data storage unit, a video data transmission unit that transmits the first video data or the second video data to the communication terminal in response to a request from the communication terminal, A character data transmitting unit that transmits character data stored in association with the second moving image data or the first moving image data to the communication terminal when transmitting the two moving image data to the communication terminal. A moving image data receiving unit that receives the first moving image data or the second moving image data transmitted by the data transmitting unit, a character data receiving unit that receives the character data transmitted by the character data transmitting unit, and a character indicated by the character data A moving image distribution system is provided that includes a display control unit that displays the second moving image data.

  The moving image distribution system may further include an encoding unit that acquires the first moving image data from another device, encodes the first moving image data, and generates the second moving image data. The encoding unit may encode the first moving image data to generate a plurality of moving image data having different image quality including the second moving image data. The character data generation unit may extract a character image included in a frame constituting the first moving image data, and the character data transmission unit converts the text data obtained by character recognition of the character image into the text data You may transmit to a communication terminal. The character data transmission unit may transmit display position information indicating a position of the character image in a frame including the character image and the text data to the communication terminal. The character data generation unit may extract a character image included in a frame constituting the first moving image data, and the character data transmission unit may extract the character image and the character image in the frame including the character image. The character data including the display position information indicating the position may be transmitted to the communication terminal.

  The communication terminal may further include a request transmission unit that transmits a transmission request for the video content including whether the character data needs to be transmitted to the video transmission device, and the video transmission device receives the transmission request. It may further include a request reception unit and a character data transmission determination unit that determines whether or not to transmit the character data to the communication terminal based on the transmission request, and the character data transmission unit includes the character data The character data may be transmitted to the communication terminal when the transmission determination unit determines that the character data is to be transmitted to the communication terminal. The character data transmission determining unit is configured to store the character data stored in association with the first moving image data or the second moving image data that the moving image data transmitting unit transmits to the communication terminal in response to the transmission request. Whether the character data is transmitted to the communication terminal may be determined based on the assigned flag. The moving image data storage unit may store a plurality of different image quality moving image data of the moving image content including the first moving image data and the second moving image data, and the character data storage unit may store the plurality of different image quality values. The character data may be stored with the flag indicating whether or not to transmit the character data for each moving image data.

  The communication terminal may further include an image quality determination unit that determines an image quality of the moving image data, and the display control unit detects the character indicated by the character data when the image quality of the moving image data is lower than a predetermined threshold value. May be displayed together with the moving image data. The communication terminal may further include a display setting unit that sets a display method of a character indicated by the character data received by the character data receiving unit, wherein the display setting unit includes text data and display position information. The character indicated by the text data is displayed in the character window adjacent to the moving image data by combining it with the position indicated by the display position information in the moving image data received by the moving image data receiving unit. The display control unit may display the characters indicated by the text data together with the moving image data according to the setting by the display setting unit. When the character indicated by the text data is combined and displayed at the position indicated by the display position information in the moving image data, the display setting unit synthesizes only the character or the character arranged on a predetermined object. You may further set whether to synthesize. When the character data includes a character image and display position information, the display setting unit synthesizes and displays the character image at a position indicated by the display position information in the moving image data received by the moving image data receiving unit. Or display in a character window adjacent to the moving image data, and the display control unit may display the character image together with the moving image data according to the setting by the display setting unit.

  According to the second aspect of the present invention, the first moving image data storing unit stores the first moving image data included in the moving image content and the second moving image data of the moving image content having a lower image quality than the first moving image data. Character data storage that extracts character information from the character data and generates character data based on the character information, character data, and the first moving image data or the second moving image data from which the character information is extracted and stored in association with each other In response to a request from the communication terminal, a moving image data transmission unit that transmits the first moving image data or the second moving image data to the communication terminal, and a second moving image data when the second moving image data is transmitted to the communication terminal. There is provided a moving image distribution apparatus including a character data transmitting unit that transmits character data stored in association with data or first moving image data to a communication terminal.

  According to the 3rd aspect of this invention, the program for functioning a computer as said moving image transmission apparatus is provided.

  According to the fourth aspect of the present invention, the character data receiving unit that receives character data indicating characters included in the moving image content, the moving image data receiving unit that receives the moving image data of the moving image content, and the image quality of the moving image data are determined. There is provided a communication terminal that includes an image quality determination unit that performs display and a display control unit that displays characters indicated by the character data together with the moving image data when the image quality of the moving image data is lower than a predetermined threshold.

  The communication terminal may further include a display setting unit that sets a display method of a character indicated by the character data received by the character data receiving unit, wherein the display setting unit includes text data and display position information. The character indicated by the text data is displayed in the character window adjacent to the moving image data by combining it with the position indicated by the display position information in the moving image data received by the moving image data receiving unit. The display control unit may display the characters indicated by the text data together with the moving image data according to the setting by the display setting unit. When the character indicated by the text data is combined and displayed at the position indicated by the display position information in the moving image data, the display setting unit synthesizes only the character or the character arranged on a predetermined object. You may further set whether to synthesize. The communication terminal may further include a display setting unit that sets a display method of a character indicated by the character data received by the character data receiving unit. The display setting unit includes a character image and display position information. Whether the character image is synthesized and displayed at a position indicated by the display position information in the moving image data received by the moving image data receiving unit or displayed in a character window adjacent to the moving image data. The display control unit may display the character image together with the moving image data according to the setting by the display setting unit.

  According to the fifth aspect of the present invention, there is provided a program for causing a computer to function as the communication terminal.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

It is an example of the conventional moving image delivery system 40. It is an example of the moving image delivery system 70 which delivers several moving image data of different image quality. An example of animation distribution system 10 is shown roughly. An example of functional composition of animation distribution system 10 is shown roughly. An example of the flow of processing by the moving picture transmitting apparatus 100 is schematically shown. An example of the flow of processing by communication terminal 200 is shown roughly. An example of a functional structure of the moving image delivery system 10 which has the communication terminal 200 provided with the image quality determination part 210 is shown roughly. An example of the flow of processing by communication terminal 200 is shown roughly. 3 is an example of a communication terminal 200 including a display setting unit 212. An example of a functional structure of the communication system 10 which has the moving image transmitter 100 provided with the character data transmission determination part 118 is shown roughly. A moving image display example 300 is schematically shown. A moving image display example 310 is schematically shown. A moving image display example 320 is schematically shown. A moving image display example 330 is schematically shown. A moving image display example 340 is schematically shown. An example of the character data table 400 is shown schematically. It is an example of the moving image delivery system 10 which delivers the moving image received from the other apparatus. An example of functional composition of animation distribution system 10 is shown roughly. 2 shows an example of a hardware configuration of a computer 900 that functions as the moving picture transmitting apparatus 100.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 3 schematically shows an example of the moving image distribution system 10. The moving image distribution system 10 includes a moving image transmission device 100 and a communication terminal 200. The video transmission device 100 provides a video content distribution service to the communication terminal 200.

  The communication terminal 200 may be any terminal as long as it can display the moving image content distributed by the moving image transmission apparatus 100. For example, the communication terminal 200 is a mobile phone such as a smartphone, a tablet terminal, and a PC (Personal Computer).

  The video transmission device 100 and the communication terminal 200 communicate via the network 20. The network 20 may include at least one of the Internet, a wired LAN, a wireless LAN, a wired telephone network, and a wireless telephone network.

  The moving picture transmission device 100 distributes a plurality of moving picture contents having different contents. The moving image transmitting apparatus 100 can transmit a plurality of moving image data having different image quality for each of a plurality of moving image contents having different contents.

  For example, the moving image transmitting apparatus 100 transmits moving image data by selecting either the high image quality mode or the low image quality mode for each of a plurality of moving image contents having different contents. There may be three or more types of image quality. For example, in the case of three types, the moving image transmission apparatus 100 selects one of the high image quality mode, the standard image quality mode, and the low image quality mode and transmits the moving image data.

  The moving image transmitting apparatus 100 may store a plurality of moving image data having different image quality for each of a plurality of moving image contents having different contents. In the present embodiment, a plurality of pieces of moving image data having the same content and different image quality are described as a moving image set.

  The moving image set may include one moving image data and moving image data obtained by encoding the one moving image data. The moving image set may include one moving image data and a plurality of moving image data with different image quality obtained by encoding the one moving image data with a plurality of different parameter settings. In addition, the moving image set may include a plurality of moving image data with different image quality obtained by encoding the one moving image data with a plurality of different parameter settings without including one moving image data.

  The moving image transmission apparatus 100 transmits, for example, moving image data having an image quality requested by the user of the communication terminal 200 to the communication terminal 200 in the moving image set. In addition, for example, the moving image transmitting apparatus 100 transmits moving image data having an image quality corresponding to the communication environment in the moving image set to the communication terminal 200.

  When transmitting moving image data having a certain image quality from the moving image set to the communication terminal 200, the moving image transmitting apparatus 100 according to the present embodiment also communicates character data based on character information extracted from moving image data having higher image quality than the moving image data. Transmit to terminal 200.

  For example, the moving image transmission apparatus 100 extracts a character image included in a frame constituting moving image data having higher image quality than the moving image data transmitted to the communication terminal 200, cuts out the character image from the frame, and transmits the character image to the communication terminal 200. . Thereby, the image quality of the character part in a moving image can be improved and a character can be made easy to see.

  Further, for example, the moving image transmission apparatus 100 is obtained by extracting a character image included in a frame constituting moving image data having higher image quality than the moving image data transmitted to the communication terminal 200 and recognizing the character image. The text data is transmitted to the communication terminal 200. By transmitting text data instead of character images, the amount of transmission data can be reduced. Since the amount of text data is much smaller than that of moving image data, it is possible to make the characters easier to see without substantially increasing the amount of transmitted data. In addition, it is possible to provide a moving image with fewer character recognition errors than when character images are extracted from moving image data to be transmitted and character recognition is performed.

  FIG. 4 schematically illustrates an example of a functional configuration of the moving image distribution system 10. The moving image transmission apparatus 100 includes a moving image data storage unit 106, a character data generation unit 110, a character data storage unit 111, a request reception unit 112, a moving image data transmission unit 116, and a character data transmission unit 120. The communication terminal 200 includes a request transmission unit 202, a moving image data reception unit 204, a character data reception unit 206, and a display control unit 208. In addition, it is not necessarily essential that the moving image distribution system 10 includes all of these configurations. Hereinafter, first, the moving image transmitting apparatus 100 will be described.

  The moving image data storage unit 106 stores moving image data to be distributed. The moving image data storage unit 106 may store a plurality of moving image data included in the moving image set in association with each other. The moving image data storage unit 106 passes the moving image data to be transmitted to the moving image data transmission unit 116 in response to the transmission request received by the request receiving unit 112 that receives a transmission request for moving image content from the communication terminal 200. The moving image data storage unit 106 may pass to the moving image data transmission unit 116 moving image data having an image quality corresponding to the communication environment among the requested moving image data of the moving image content. In addition, when the transmission request received by the request receiving unit 112 includes designation of image quality, the moving image data storage unit 106 transmits moving image data having the specified image quality among moving image data of the requested moving image content. 116 may be passed.

  The character data generation unit 110 extracts character information from the moving image data stored in the moving image data storage unit 106, and generates character data based on the extracted character information. For example, the character data generation unit 110 extracts character information from moving image data having the highest image quality in the moving image set. The character data generation unit 110 may extract a character image included in each of a plurality of frames constituting the moving image data as character information. The character data generation unit 110 generates text data by recognizing the extracted character image.

  The character data generation unit 110 may further generate display time information of text data. The display time information may be the frame number of the frame from which the character image is extracted. When the same character is included in a plurality of consecutive frames, the character data generation unit 110 may generate character data including one text data and frame numbers of the plurality of frames for the plurality of frames. .

  The character data generation unit 110 may further generate font information. The font information may include at least one of a character color, a character size, and a font. The character data generation unit 110 may further generate display position information of text data. The display position information indicates, for example, the position of the character image in the frame from which the character image is extracted. The display position information may include the direction of the character string of the text data.

  Here, the character data may include the type of text data. The type of text data includes, for example, subtitles and background. For example, the character data generation unit 110 generates character data including text data and a type of text data in accordance with an instruction from an administrator or the like who manages the moving picture transmission apparatus 100. For example, the administrator of the moving image transmitting apparatus 100 determines whether the character is a subtitle or a background character by browsing the moving image data.

  The text data generation unit 110 may determine the type of text data. For example, the character data generation unit 110 acquires text data by recognizing character information extracted from moving image data, and recognizes the sound when the character is displayed by recognizing the sound of the moving image data. Get the indicated text data. Then, the character data generation unit 110 compares the text data acquired by the character recognition with the text data acquired by the speech recognition, and determines that the type is a caption when the matching degree is higher than a predetermined threshold value. When the degree of coincidence is lower than a predetermined threshold, the type is determined as background.

  In addition, the priority of text data may be included in the character data. The priority of text data may be two levels, high and low, or may be three or more levels. For example, the character data generation unit 110 generates character data including text data and the priority of the text data in accordance with an instruction from an administrator or the like who manages the moving picture transmission apparatus 100. The administrator of the moving image transmitting apparatus 100 determines the priority of the text data by browsing the moving image data, for example.

  The character data storage unit 111 stores the character data generated by the character data generation unit 110. For example, the character data storage unit 111 stores character data including text data generated by the character data generation unit 110, display time information of the text data, font information, and display position information. The character data storage unit 111 may store character data further including at least one of text data type and text data priority. Further, for example, the character data storage unit 111 stores character data including the character image generated by the character data generation unit 110, display time information of the character image, and display position information.

  The character data storage unit 111 manages character data to be stored in association with a moving image set from which character data has been extracted. The character data storage unit 111 stores, for example, character data and moving image data obtained by extracting character information from which the character data is generated in association with each other. The character data storage unit 111 transmits the character data when transmitting the moving image data to the communication terminal 200 for all the moving image data of the moving image set including the moving image data from which the character information from which the character data is generated is extracted. A flag indicating whether or not may be assigned to the character data for management. In addition, the character data storage unit 111 may manage by assigning the flag for each character type such as caption or background. The character data storage unit 111 determines whether to transmit each character data based on the transmission request received by the request reception unit 112, and passes the character data to be transmitted to the character data transmission unit 120. In the character data storage unit 111, a flag indicating that the moving image data is transmitted is added to the character data corresponding to the moving image data transmitted by the moving image data transmission unit 116 in response to the transmission request received by the request receiving unit 112. If it is, the character data may be passed to the character data transmission unit 120.

  The flag may be given in advance by, for example, an administrator who manages the moving image transmitting apparatus 100. For example, the administrator actually browses all moving image data included in the moving image set, and assigns a flag according to a criterion such as whether characters can be read or read easily. For example, when four moving image data are associated with one character data and the administrator browses each moving image data and determines that it is better to transmit character data for two moving image data, the administrator The flag indicating that character data is transmitted for the two moving image data is associated with the one character data. As a specific example, when the flag indicating that character data is not transmitted is set to 0 and the flag indicating that character data is transmitted is set to 1, the administrator should transmit character data among the four moving image data. The flag indicating 1 for the two moving image data determined to be 0 and 0 indicating the other two moving image data is associated with the character data.

  The flag may be determined and assigned by the character data storage unit 111. For example, the character data storage unit 111 transmits character data for moving image data whose resolution is lower than a predetermined threshold among a plurality of moving image data included in the moving image set, and moving image data whose resolution is higher than a predetermined threshold. It is determined that character data is not transmitted. The predetermined threshold value may be determined by, for example, an administrator who manages the moving picture transmitting apparatus 100. For example, the administrator browses a plurality of moving image data in which the resolution of certain moving image data is changed variously, and determines the threshold value by confirming how much resolution the character can be read.

  In principle, it can be said that the larger the character size in the moving image data is, the lower the resolution is. Therefore, the administrator may determine a resolution threshold value for each character size. Then, the character data storage unit 111 reads a threshold value corresponding to the size of the character included in the frame of the moving image data, and determines that character data is transmitted when the resolution of the moving image data is lower than the threshold value. When it is high, it may be determined that character data is not transmitted.

  The character data storage unit 111 transmits character data for moving image data having a bit rate lower than a predetermined threshold among a plurality of moving image data included in the moving image set, and moving image data having a bit rate higher than a predetermined threshold It may be determined that character data is not transmitted. The predetermined threshold value may be determined by, for example, an administrator who manages the moving picture transmitting apparatus 100. For example, the administrator determines a threshold value by viewing a plurality of moving image data in which the bit rate of a certain moving image data is changed, and confirming at what bit rate the characters can be read.

  In principle, it can be said that the larger the character size in the moving image data is, the lower the bit rate is. Thus, the administrator may determine a bit rate threshold for each character size. Then, the character data storage unit 111 reads a threshold value corresponding to the size of the character included in the frame of the moving image data, and determines that character data is transmitted when the bit rate of the moving image data is lower than the threshold value. If higher, character data may not be transmitted.

  The request receiving unit 112 receives a moving image content transmission request from the communication terminal 200. The request receiving unit 112 may accept a transmission request with image quality designation. For example, the communication terminal 200 transmits a transmission request designating the image quality selected by the user of the communication terminal 200 to the moving image transmission apparatus 100. In addition, the communication terminal 200, for example, measures its own communication quality and transmits a transmission request for designating an image quality corresponding to the measured communication quality to the moving image transmission apparatus 100. The request receiving unit 112 may accept a transmission request without designating image quality.

  The moving image data transmission unit 116 transmits the moving image data received from the moving image data storage unit 106 to the communication terminal 200 in response to the transmission request received by the request receiving unit 112 from the communication terminal 200.

  The character data transmission unit 120 transmits the character data received from the character data storage unit 111 to the communication terminal 200 in response to the transmission request received by the request reception unit 112 when the moving image data transmission unit 116 transmits the moving image data. To do. The character data transmission unit 120 associates moving image data and character data in a data format conforming to, for example, MPEG-TS (MPEG-2 Transport Stream), and transmits character data.

  The character data transmission unit 120 is character data based on character information extracted from moving image data having higher image quality than the moving image data transmitted by the moving image data transmission unit 116 in the moving image set including moving image data transmitted by the moving image data transmission unit 116. May be transmitted to the communication terminal 200. For example, the character data transmission unit 120 transmits to the communication terminal 200 character data based on character information extracted from the moving image data having the highest image quality among the moving image sets including the moving image data transmitted by the moving image data transmission unit 116.

  The character data transmission unit 120 may transmit the character data stored in the character data storage unit 111 in association with the moving image data transmitted by the moving image data transmission unit 116 to the communication terminal 200. The character data transmission unit 120 is associated with the video data having higher image quality than the video data transmitted by the video data transmission unit 116 in the video set including the video data transmitted by the video data transmission unit 116. The character data stored in 111 may be transmitted to the communication terminal 200.

  Hereinafter, the communication terminal 200 will be described. The request transmission unit 202 transmits a video content transmission request to the video transmission device 100. The request transmission unit 202 may transmit a transmission request to the video transmission device 100 in accordance with an instruction from the user of the communication terminal 200.

  The moving image data receiving unit 204 receives the moving image data transmitted by the moving image transmitting apparatus 100 in response to the transmission request transmitted by the request transmitting unit 202.

  The character data receiving unit 206 receives the character data transmitted from the moving image transmitting apparatus 100 in response to the transmission request transmitted from the request transmitting unit 202.

  The display control unit 208 displays the characters indicated by the character data received by the character data receiving unit 206 together with the moving image data received by the moving image data receiving unit 204. The display control unit 208 may display the characters indicated by the moving image data and the character data on the display included in the communication terminal 200. Further, the display control unit 208 may display the characters indicated by the moving image data and the character data on a display external to the communication terminal 200.

  When the text data is included in the character data received by the character data receiving unit 206, the display control unit 208 may display the text data together with the moving image data. The display control unit 208 may display the text data included in the character data together with the moving image data according to the display time information included in the character data. When one text data and a plurality of frame numbers are included in one character data, the display control unit 208 may display the one text data together with the frames having the plurality of frame numbers.

  When the font data is further included in the character data, the display control unit 208 may display the character to which the font information is applied to the text data. When the display position information is further included in the character data, the display control unit 208 may synthesize and display the text data at the position indicated by the display position information in the moving image data.

  When the character data received by the character data receiving unit 206 includes a character image, the display control unit 208 may display the character image together with the moving image data. The display control unit 208 may display the character image included in the character data together with the moving image data according to the display time information included in the character data. When the display position information is further included in the character data, the display control unit 208 may synthesize and display the character image at the position indicated by the display position information in the moving image data.

  FIG. 5 schematically shows an example of the flow of processing by the moving picture transmitting apparatus 100. Here, an example of processing in which the moving image transmission apparatus 100 distributes moving image data other than moving image data having the highest image quality in the moving image set to the communication terminal 200 in response to a moving image content transmission request from the communication terminal 200 is shown. . Each process illustrated in FIG. 5 is executed mainly by a control unit included in the moving image transmission apparatus 100.

  In step 402 (step may be abbreviated as S) 402, the request reception unit 112 receives a transmission request for moving image content from the request transmission unit 202. In S <b> 404, the moving image data storage unit 106 determines moving image data to be transmitted to the communication terminal 200. In S406, the moving image data transmission unit 116 transmits the moving image data determined in S404 to the communication terminal 200.

  In step S408, the character data storage unit 111 determines whether there is a character data transmission flag for the moving image data to be transmitted determined in step S404. The character data storage unit 111 may determine whether the character data corresponding to the moving image data to be transmitted is associated with a flag indicating that character data is transmitted for the moving image data. If it is determined that there is a transmission flag, the process proceeds to S410. If it is determined that there is no transmission flag, the process ends.

  In S410, the character data transmission unit 120 transmits the character data corresponding to the moving image data determined in S404 to the communication terminal 200. Then, the process ends.

  FIG. 6 schematically shows an example of the flow of processing by the communication terminal 200. Here, an example of processing in which the communication terminal 200 receives moving image data and character data from the moving image transmission apparatus 100 and displays the moving image data is shown. Each process illustrated in FIG. 6 is executed mainly by a control unit included in the communication terminal 200.

  In S <b> 502, the moving image data receiving unit 204 receives the moving image data transmitted by the moving image data transmitting unit 116. In S504, the character data receiving unit 206 receives the character data transmitted by the character data transmitting unit 120.

  In S506, the display control unit 208 displays the characters indicated by the character data received by the character data receiving unit 206 in S504 together with the moving image data received by the moving image data receiving unit 204 in S502. Then, the process ends.

  As described above, as described in paragraph [0010], there has been a problem that characters included in a moving image are difficult to read. In the present embodiment, the moving image distribution system 10 shown in FIG. 4 performs the processing shown in FIGS. 5 and 6 to solve the above-mentioned problem by transmitting the corresponding character data when transmitting the moving image data. . In general, character data has a very small amount of data compared to moving image data. Therefore, characters included in a moving image can be easily seen in moving image distribution without increasing the amount of transmission data.

  The communication terminal 200 may further include an image quality determination unit 210 that determines the image quality of the received moving image. FIG. 7 is an example of a functional configuration of the moving image distribution system 10 having the communication terminal 200 including the image quality determination unit 210. The image quality determination unit 210 determines the image quality of the moving image data received by the moving image data reception unit 204. The image quality determination unit 210 may determine the image quality for each moving image data. Further, the image quality determination unit 210 may determine the image quality for each frame constituting the moving image data.

  FIG. 8 schematically shows an example of the flow of processing by the communication terminal 200. Here, an example of processing in which the communication terminal 200 receives moving image data and character data from the moving image transmission apparatus 100 and displays the moving image data is shown. Each process illustrated in FIG. 8 is executed mainly by a control unit included in the communication terminal 200.

  In S <b> 602, the moving image data receiving unit 204 receives the moving image data transmitted by the moving image data transmitting unit 116. In step S <b> 604, the character data receiving unit 206 receives the character data transmitted by the character data transmitting unit 120.

  In S606, the image quality determination unit 210 determines whether the image quality of the moving image data received by the moving image data reception unit 204 in S602 is lower than a predetermined threshold. If it is determined that the value is lower than the predetermined threshold value, the process proceeds to S608. If it is determined that the value is not lower, the process proceeds to S610.

  In S608, the display control unit 208 displays the characters indicated by the character data received by the character data receiving unit 206 in S604 together with the moving image data received by the moving image data receiving unit 204 in S602. In S610, the display control unit 208 displays the moving image data received by the moving image data receiving unit 204 in S602. Then, the process ends.

  Based on the image quality determined by the image quality determination unit 210, the display control unit 208 determines whether to display the character data received by the character data reception unit 206 together with the moving image data received by the moving image data reception unit 204. It's okay. For example, the display control unit 208 determines to display character data when the image quality determined by the image quality determination unit 210 is lower than a predetermined threshold, and does not display character data when the image quality is higher than a predetermined threshold. judge.

  For example, when the resolution of the moving image data determined by the image quality determination unit 210 is lower than a predetermined threshold, the display control unit 208 determines to display character data. When the resolution is higher than the predetermined threshold, the character data May be determined not to be displayed.

  The predetermined threshold value may be determined by a user who uses the communication terminal 200, for example. The user determines the threshold value by, for example, viewing a plurality of moving image data in which the resolution of certain moving image data is changed, and confirming at what resolution the characters can be read. In addition, the user may determine a resolution threshold for each character size. Then, the display control unit 208 reads a threshold value corresponding to the character size included in the frame of the moving image data received by the moving image data receiving unit 204, and the resolution of the moving image data received by the moving image data receiving unit 204 is the threshold value. If lower, character data may be determined to be transmitted, and if higher than the threshold, character data may not be transmitted.

  For example, if the bit rate of the moving image data determined by the image quality determination unit 210 is lower than a predetermined threshold, the display control unit 208 determines to display character data. If the bit rate is higher than the predetermined threshold, the character data May be determined not to be displayed.

  The predetermined threshold value may be determined by a user who uses the communication terminal 200, for example. The user determines the threshold value by, for example, viewing a plurality of moving image data in which the bit rate of certain moving image data is variously changed and confirming how much resolution the character can be read. The user may determine a bit rate threshold value for each character size. Then, the display control unit 208 reads a threshold value corresponding to the character size included in the frame of the moving image data received by the moving image data receiving unit 204, and the bit rate of the moving image data received by the moving image data receiving unit 204 is When it is lower than the threshold value, it may be determined that character data is transmitted, and when it is higher than the threshold value, it may be determined that character data is not transmitted.

  As described above, the moving image transmission apparatus 100 may transmit character data to the communication terminal 200 when the flag indicating that character data is transmitted is associated with the character data for the moving image data to be transmitted. Not limited to this, when moving image data is transmitted to the communication terminal 200, character data corresponding to the moving image data may be transmitted at all times. For example, the moving image transmitting apparatus 100 transmits data of all layers of moving image data when transmitting moving image data encoded to include a plurality of pieces of image quality data by the hierarchical encoding method to the communication terminal 200. Also send character data. Even if the video transmission device 100 transmits data of all layers of the video data, the communication terminal 200 may not receive all of the data properly, and the image quality of the video that can be played back by the communication terminal 200 may deteriorate. . In the moving image distribution system 10 according to the present embodiment, the image quality determination unit 210 determines whether or not the image quality of the moving image data to be reproduced received by the moving image data reception unit 204 is lower than a predetermined threshold, and displays When the control unit 208 determines that the image quality determination unit 210 is low, the character data reception unit 206 displays the character data received together with the moving image data, and when it is determined that the control unit 208 is not low, the character data reception unit 206 The moving image data may be displayed without displaying the received character data.

  The communication terminal 200 may further include a display setting unit 212 that sets a display method of characters indicated by the character data received by the character data receiving unit 206. FIG. 9 is an example of a communication terminal 200 that includes a display setting unit 212. The display setting unit 212 sets the character display method by instructing the display control unit 208 to display the character indicated by the received character data. For example, when the character data includes text data, the display setting unit 212 sets the display position of the character indicated by the text data. The display setting unit 212 synthesizes and displays the character indicated by the text data at the position indicated by the display position information in the moving image data, or displays the character indicated by the text data in the character window adjacent to the moving image data. Set. The display control unit 208 may display the characters indicated by the text data together with the moving image data in accordance with an instruction from the display setting unit 212.

  When the character indicated by the text data is displayed at the position indicated by the display position information in the moving image data, the display setting unit 212 synthesizes only the character or synthesizes the character arranged on the predetermined object. May be set. The predetermined object may be any object as long as the characters placed on the object can be easily seen. For example, the predetermined object is a solid object having an arbitrary shape. The arbitrary shape may be a rectangle, for example. The color of the plain object may be any color, for example, a white object. By combining and displaying the character indicated by the text data arranged on the object at the position indicated by the display position information in the moving image data, the character can be easily seen.

  When the character data received by the character data receiving unit 206 includes text data and the type of text data, the display setting unit 212 may set whether to display for each type of text data. . For example, the display setting unit 212 can be set to display text data whose type is caption and not to display text data whose type is background.

  If the text data received by the text data receiving unit 206 includes text data and text data priority, the display setting unit 212 determines whether to display the text data based on the text data priority. May be set. For example, the display setting unit 212 can be set so that text data with a high priority is displayed and text data with a low priority is not displayed.

  For example, when the character data includes a character image, the display setting unit 212 sets the display position of the character image. The display setting unit 212 may set whether to display the character image by combining it with the position indicated by the display position information in the moving image data or displaying it on the character window. The display control unit 208 may display the character image together with the moving image data according to the setting by the display setting unit 212.

  The moving picture transmission apparatus 100 may further include a character data transmission determination unit 118. FIG. 10 is an example of a functional configuration of the moving image distribution system 10 having the moving image transmission apparatus 100 including the character data transmission determination unit 118. In the moving image distribution system 10 shown in FIG. 10, the request transmission unit 202 may transmit a moving image content transmission request to the moving image transmission device 100, and transmits a moving image content transmission request including whether or not to transmit character data. You may transmit to the apparatus 100. For example, the request transmission unit 202 transmits a video content transmission request including whether or not to transmit character data to the video transmission device 100 in accordance with an instruction from the user of the communication terminal 200.

  The character data transmission determination unit 118 determines whether or not to transmit the character data based on the necessity of transmission when the transmission request of the moving image content received by the request reception unit 112 includes the necessity of transmission of the character data. Determine whether.

  For example, when the video content transmission request includes information indicating whether or not to transmit character data, the character data transmission determination unit 118 passes information indicating that character data is not transmitted to the character data storage unit 111. When the character data storage unit 111 receives information for instructing not to transmit character data from the character data transmission determination unit 118, the character data storage unit 111 does not pass the character data to the character data transmission unit 120.

  In addition, for example, when the video content transmission request includes information indicating that character data needs to be transmitted, the character data transmission determination unit 118 passes information indicating that character data is to be transmitted to the character data storage unit 111. . When the character data storage unit 111 receives information instructing to transmit the character data from the character data transmission determination unit 118, the character data storage unit 111 adds the moving image data to the character data corresponding to the moving image data transmitted by the moving image data transmission unit 116. When the flag indicating transmission is given, the character data is transferred to the character data transmission unit 120, and when the flag indicating transmission of the video data is not added to the character data, the character data transmission is performed. Character data is not passed to the section 120.

  FIG. 11 schematically shows a moving image display example 300 by the communication terminal 200. The moving image display example 300 shows an example in which the communication terminal 200 receives and displays moving image data having the highest image quality from moving image data included in the moving image set from the moving image transmitting apparatus 100. The caption area 302 is an area for displaying captions. The background character area 304 is an area for displaying a background character.

  FIG. 12 schematically shows a moving image display example 310 by the communication terminal 200. In the moving image display example 310, the communication terminal 200 receives moving image data other than the moving image data having the highest image quality from moving image data included in the moving image set from the moving image transmitting apparatus 100, and displays moving image data without displaying character data. An example of displaying is shown. In the moving image display example 310, as shown in the subtitle area 302 and the background character area 304, the characters included in the moving image data are not readable or difficult to read.

  FIG. 13 schematically shows a moving image display example 320 by the communication terminal 200. In the moving image display example 320, the communication terminal 200 includes moving image data other than moving image data with the highest image quality among moving image data included in the moving image set, text data corresponding to characters in the subtitle area 302, and character data including display position information. A display example in the case of receiving and is shown.

  As shown in the moving image display example 320, the display control unit 208 may synthesize and display the character 326 indicated by the text data included in the character data at the position indicated by the display position information. If the received character data includes text data and display position information corresponding to the characters in the background character area 304, the display control unit 208 combines the characters with the positions indicated by the display position information and displays them. May be.

  FIG. 14 schematically shows a moving image display example 330 by the communication terminal 200. In the moving image display example 330, the communication terminal 200 receives moving image data other than moving image data having the highest image quality among moving image data included in the moving image set, and text data and display position information corresponding to characters in the caption area 302. A display example is shown.

  As shown in the moving image display example 330, the display control unit 208 may arrange the characters indicated by the text data included in the character data on the white rectangle 336 and synthesize the characters at the position indicated by the display position information. . If the received character data includes text data and display position information corresponding to the characters in the background character area 304, the display control unit 208 arranges the characters on a white rectangle and displays the display position. You may synthesize | combine and display on the position which information shows.

  Note that the display control unit 208 may display the characters indicated by the text data included in the character data by arranging them on a color rectangle other than white. Further, the display control unit 208 may display the character indicated by the text data included in the character data by arranging it on an object having a shape other than a rectangle.

  FIG. 15 schematically shows a moving image display example 340 by the communication terminal 200. The moving image display example 340 is a display example when the communication terminal 200 receives moving image data other than moving image data having the highest image quality among moving image data included in the moving image set and text data corresponding to characters in the caption area 302. Indicates. The display control unit 208 may cause the character window 350 to display the character 346 indicated by the text data included in the character data, as shown in the moving image display example 340.

  FIG. 16 schematically shows an example of the character data table 400 generated by the character data generation unit 110. The character data table 400 includes character data for each frame. The data format of the character data generated by the character data generation unit 110 may not be a table format.

  The character data table 400 includes a frame number field 401, a text field 402, a type field 404, a character color field 406, a size field 408, a font field 410, and a display position field 412. The frame number column includes a frame number. The text column 402 includes text data. The type column 404 includes the type of text data.

  The character color column 406 includes a character color. Here, an example is shown in which the character color is indicated by the name of the color. For example, it may be an RGB value. The size column 408 includes a character size. The font field 410 includes a font. The display position column 412 includes display position information. The display position information may include coordinate information.

  In addition, the moving image transmission device 100 may store moving image data received from another device and transmit it to the communication terminal 200. FIG. 17 is an example of a moving image distribution system 10 that distributes moving images received from other devices. For example, the video transmission device 100 receives video data distributed by the video server 30 and transmits the video data to the communication terminal 200. The moving picture transmitting apparatus 100 may encode the moving picture data received from the moving picture server 30 and transmit it to the communication terminal 200. In addition, the moving image transmitting apparatus 100 may receive moving image data encoded by another device and transmit the moving image data to the communication terminal 200. The video transmission device 100 may transmit the video data generated in the video transmission device 100 to the communication terminal 200. Further, the moving picture transmission device 100 may encode the moving picture data generated by the moving picture transmission device 100 and transmit the encoded data to the communication terminal 200.

  FIG. 18 schematically illustrates an example of a functional configuration of the moving image distribution system 10. The moving image transmitting apparatus 100 receives moving image data from the outside in the configuration of the moving image transmitting apparatus 100 described in FIG. 4 in paragraph [0034], encodes the received moving image data, and generates moving image data as moving image data. The encoding unit 122 further stores in the storage unit 106.

  The encoding unit 122 encodes moving image data acquired from another device with arbitrary parameter settings to generate a moving image set. In addition, when the moving image set is acquired from another device, the encoding unit 122 may generate a new moving image set by encoding with an arbitrary parameter. The encoding unit 122 stores the generated moving image set in the moving image data storage unit 106.

  The character data generation unit 110 extracts character information from the moving image data having the highest image quality from the moving image set stored in the moving image data storage unit 106, generates character data based on the extracted character information, and extracts the character information. The character set is stored in the character data storage unit 111 in association with the moving image set.

  In response to a video data distribution request received from the communication terminal 200, the video transmission device 100 encodes any video data included in a video set generated by encoding video data received from another device, and the video set. Is transmitted to the communication terminal 200.

  FIG. 19 shows an example of the hardware configuration of a computer 900 that functions as the moving picture transmitting apparatus 100. The computer 900 according to this embodiment includes a CPU peripheral unit including a CPU 1000, a RAM 1020, and a graphic controller 1075 connected to each other by a host controller 1082, and a communication I / F 1030 connected to the host controller 1082 by an input / output controller 1084. An input / output unit including a hard disk drive 1040 and a DVD drive 1060, and a legacy input / output unit including a ROM 1010, an FD drive 1050, and an input / output chip 1070 connected to the input / output controller 1084 are provided.

  The CPU 1000 operates based on programs stored in the ROM 1010 and the RAM 1020, and controls each unit. The graphic controller 1075 acquires image data generated by the CPU 1000 or the like on a frame buffer provided in the RAM 1020 and displays the image data on the display 1080. Alternatively, the graphic controller 1075 may include a frame buffer that stores image data generated by the CPU 1000 or the like.

  The communication I / F 1030 communicates with other devices via a network by wire or wireless. The communication I / F 1030 functions as hardware that performs communication. The hard disk drive 1040 stores programs and data used by the CPU 1000. The DVD drive 1060 reads a program or data from the DVD-ROM 1095 and provides it to the hard disk drive 1040 via the RAM 1020.

  The ROM 1010 stores a boot program that the computer 900 executes at startup, a program that depends on the hardware of the computer 900, and the like. The FD drive 1050 reads a program or data from the flexible disk 1090 and provides it to the hard disk drive 1040 via the RAM 1020. The input / output chip 1070 connects the FD drive 1050 to the input / output controller 1084, and connects various input / output devices to the input / output controller 1084 via, for example, a parallel port, a serial port, a keyboard port, and a mouse port. Connect to.

  A program provided to the hard disk drive 1040 via the RAM 1020 is stored in a recording medium such as the flexible disk 1090, the DVD-ROM 1095, or an IC card and provided by the user. The program is read from the recording medium, installed in the hard disk drive 1040 via the RAM 1020, and executed by the CPU 1000.

  A program that is installed in the computer 900 and causes the computer 900 to function as the moving image transmission apparatus 100 may work on the CPU 1000 or the like to cause the computer 900 to function as each unit of the moving image transmission apparatus 100. The information processing described in these programs is read by the computer 900, whereby the moving image data storage unit 106, the character data generation unit, which are specific means in which the software and the various hardware resources described above cooperate. 110, a character data storage unit 111, a request reception unit 112, a moving image data transmission unit 116, a character data transmission determination unit 118, a character data transmission unit 120, and an encoding unit 122. And the specific moving image transmission apparatus 100 according to the use purpose is constructed | assembled by implement | achieving the calculation or processing of the information according to the use purpose of the computer 900 in this embodiment by these specific means.

  In the above description, each unit of the communication terminal 200 may be realized by hardware or may be realized by software. Further, it may be realized by a combination of hardware and software. Further, the computer may function as the communication terminal 200 by executing the program. The program may be installed in a computer constituting at least a part of the communication terminal 200 from a computer-readable medium or a storage device connected to a network.

  A program that is installed in a computer and causes the computer to function as the communication terminal 200 according to the present embodiment causes the CPU or the like to function as each unit of the communication terminal 200. Information processing described in these programs functions as a specific means in which software and hardware resources of the communication terminal 200 cooperate with each other by being read by a computer.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

10 video distribution system, 20 network, 30 video server, 40 video distribution system, 50 video transmission device, 51 request reception unit, 53 video data storage unit, 54 video data transmission unit, 55 video data, 60 communication terminal, 61 request transmission 62, moving image data receiving unit, 70 moving image distribution system, 80 moving image transmission apparatus, 81 request receiving unit, 83 moving image data storage unit, 84 moving image data transmitting unit, 85 high quality moving image data, 86 low quality moving image data, 90 communication terminal 91 request transmission unit, 92 video data reception unit, 100 video transmission device, 106 video data storage unit, 110 character data generation unit, 111 character data storage unit, 112 request reception unit, 116 video data transmission unit, 118 character data transmission Judgment unit, 120 character data transmission unit, 122 encoding unit 200 communication terminal, 202 request transmission unit, 204 moving image data receiving unit, 206 character data receiving unit, 208 display control unit, 210 image quality determination unit, 212 display setting unit, 300 moving image display example, 302 subtitle area, 304 background character area, 310 movie display example, 320 movie display example, 326 characters, 330 movie display example, 336 rectangle, 340 movie display example, 346 characters, 350 character window, 400 character data table, 401 frame number column, 402 text column, 404 type column , 406 Character color field, 408 Size field, 410 Font field, 412 Display position field, 900 Computer, 1000 CPU, 1010 ROM, 1020 RAM, 1030 Communication I / F, 1040 Hard disk drive, 1050 FD drive, 960 DVD Live, 1070 output chip 1075 graphic controller 1080 display, 1082 host controller, 1084 input-output controller, 1090 a flexible disk, 1095 DVD-ROM

Claims (20)

A video transmission device that distributes video content including a plurality of video data and character data corresponding to the video content;
A video distribution system comprising a communication terminal that receives and displays the video content and the character data,
The video transmitting device is
A moving image data storage unit that stores first moving image data included in the moving image content, and second moving image data of the moving image content having a lower image quality than the first moving image data;
A character data generating unit that extracts character information from the first moving image data and generates character data based on the character information;
A character data storage unit that stores the character data in association with the first moving image data or the second moving image data from which the character information is extracted, and includes the first moving image data and the second moving image data. For each of a plurality of video data included in the video content, a threshold corresponding to the size of characters included in a frame of the video data is read, and character data is transmitted to video data having a resolution lower than the threshold. A character data storage unit that associates a flag indicating that the character data is not transmitted with the moving image data having a resolution higher than the threshold value ,
In response to a request from the communication terminal, a moving image data transmission unit that transmits the first moving image data or the second moving image data to the communication terminal;
When transmitting the second moving image data to the communication terminal, if the flag indicating that the character data is transmitted is associated with the second moving image data , the second moving image data or the first moving image A character data transmission unit that transmits the character data stored in association with data to the communication terminal and does not transmit the character data when the flag indicating that the character data is not transmitted is associated ; Have
The communication terminal is
A moving image data receiving unit for receiving the first moving image data or the second moving image data transmitted by the moving image data transmitting unit;
A character data receiver for receiving the character data transmitted by the character data transmitter;
A display control unit for displaying the character indicated by the character data together with the second moving image data,
Video distribution system.   The moving image distribution according to claim 1, wherein the moving image transmission device further includes an encoding unit that acquires the first moving image data from another device, encodes the first moving image data, and generates the second moving image data. system.   The moving image distribution system according to claim 2, wherein the encoding unit encodes the first moving image data to generate a plurality of moving image data having different image quality including the second moving image data. The character data generation unit extracts a character image included in a frame constituting the first moving image data;
The moving image distribution system according to any one of claims 1 to 3, wherein the character data transmission unit transmits text data acquired by character recognition of the character image to the communication terminal.   The moving image distribution system according to claim 4, wherein the character data transmission unit transmits display position information indicating a position of the character image in a frame including the character image and the text data to the communication terminal. The character data generation unit extracts a character image included in a frame constituting the first moving image data;
The moving image according to claim 1, wherein the character data transmission unit transmits the character data including the character image and display position information indicating a position of the character image in a frame including the character image to the communication terminal. Distribution system. The communication terminal further includes a request transmission unit that transmits a transmission request for the video content including whether the character data needs to be transmitted to the video transmission device,
The moving image transmission device further includes a request reception unit that receives the transmission request, and a character data transmission determination unit that determines whether to transmit the character data to the communication terminal based on the transmission request,
The character data transmission unit transmits the character data to the communication terminal when the character data transmission determination unit determines to transmit the character data to the communication terminal. The video distribution system described in the section.   The character data transmission determining unit is configured to store the character data stored in association with the first moving image data or the second moving image data that the moving image data transmitting unit transmits to the communication terminal in response to the transmission request. The moving image distribution system according to claim 7, wherein it is determined whether to transmit the character data to the communication terminal based on a given flag. The moving image data storage unit stores moving image data of a plurality of different image quality of the moving image content including the first moving image data and the second moving image data,
The moving image distribution according to claim 8, wherein the character data storage unit adds the flag indicating whether the character data is transmitted for each of the plurality of moving image data having different image quality to the character data and stores the flag. system. The communication terminal further includes an image quality determination unit that determines an image quality of the moving image data,
The moving image according to any one of claims 1 to 9, wherein the display control unit displays a character indicated by the character data together with the moving image data when an image quality of the moving image data is lower than a predetermined threshold value. Distribution system. The communication terminal further includes a display setting unit for setting a display method of characters indicated by the character data received by the character data receiving unit,
When the character data includes text data and display position information, the display setting unit combines the character indicated by the text data with the position indicated by the display position information in the moving image data received by the moving image data receiving unit. To display in a character window adjacent to the video data,
The moving image distribution system according to any one of claims 1 to 10, wherein the display control unit displays characters indicated by the text data together with the moving image data according to the setting by the display setting unit.   The display setting unit combines the characters only when the characters indicated by the text data are displayed at the position indicated by the display position information in the moving image data, or the characters arranged on a predetermined object. The moving image distribution system according to claim 11, further comprising setting whether to synthesize. When the character data includes a character image and display position information, the display setting unit synthesizes and displays the character image at a position indicated by the display position information in the moving image data received by the moving image data receiving unit. Or display in a character window adjacent to the video data,
The moving image distribution system according to claim 11, wherein the display control unit displays the character image together with the moving image data according to the setting by the display setting unit. A moving image data storage unit that stores first moving image data included in the moving image content, and second moving image data of the moving image content having a lower image quality than the first moving image data;
A character data generating unit that extracts character information from the first moving image data and generates character data based on the character information;
A character data storage unit that stores the character data in association with the first moving image data or the second moving image data from which the character information is extracted, and includes the first moving image data and the second moving image data. For each of a plurality of video data included in the video content, a threshold corresponding to the size of characters included in a frame of the video data is read, and character data is transmitted to video data having a resolution lower than the threshold. A character data storage unit that associates a flag indicating that the character data is not transmitted with the moving image data having a resolution higher than the threshold value ,
In response to a request from a communication terminal, a moving image data transmission unit that transmits the first moving image data or the second moving image data to the communication terminal;
When transmitting the second moving image data to the communication terminal, if the flag indicating that the character data is transmitted is associated with the second moving image data , the second moving image data or the first moving image data When the flag indicating that the character data stored in association with the communication terminal is not transmitted and the character data is not transmitted is associated with the character data transmitting unit , the character data is not transmitted. A moving picture transmission apparatus provided.   A program for causing a computer to function as the moving picture transmitting apparatus according to claim 14. A character data receiving unit for receiving character data indicating characters included in the video content;
A video data receiver for receiving video data of the video content;
An image quality determination unit for determining the image quality of the video data;
A display control unit that displays characters indicated by the character data together with the moving image data when the image quality of the moving image data is lower than a predetermined threshold;
The image quality determination unit determines the resolution of the moving image data,
The display control unit reads a threshold value corresponding to the size of a character included in a frame of the moving image data, and when the resolution of the moving image data is lower than the threshold value, the character indicated by the character data together with the moving image data When the resolution of the moving image data is higher than the threshold, the characters indicated by the character data are not displayed together with the moving image data.
Communication terminal. A display setting unit for setting a display method of characters indicated by the character data received by the character data receiving unit;
When the character data includes text data and display position information, the display setting unit combines the character indicated by the text data with the position indicated by the display position information in the moving image data received by the moving image data receiving unit. To display in a character window adjacent to the video data,
The communication terminal according to claim 16, wherein the display control unit displays the characters indicated by the text data together with the moving image data according to the setting by the display setting unit.   The display setting unit combines the characters only when the characters indicated by the text data are displayed at the position indicated by the display position information in the moving image data, or the characters arranged on a predetermined object. The communication terminal according to claim 17, further setting whether to synthesize. A display setting unit for setting a display method of characters indicated by the character data received by the character data receiving unit;
When the character data includes a character image and display position information, the display setting unit synthesizes and displays the character image at a position indicated by the display position information in the moving image data received by the moving image data receiving unit. Or display in a character window adjacent to the video data,
The communication terminal according to claim 16, wherein the display control unit displays the character image together with the moving image data in accordance with the setting by the display setting unit.   The program for functioning a computer as a communication terminal as described in any one of Claims 16-19.