JP6646973B2 - Information processing apparatus, control method for information processing apparatus, and program - Google Patents

Description

  The present invention relates to an information processing device capable of receiving data from an external device.

  2. Description of the Related Art Conventionally, when an image generated by an imaging device is taken into a personal computer (PC), the file names of the images are compared, and the already taken image is not taken so as not to duplicate the already taken image. It has been done so.

  For example, Patent Document 1 discloses that the same image is already stored in a PC by comparing the file name of the image with metadata associated with the image, such as the ID of the camera used for capturing the image and shooting parameters. It is disclosed to determine whether it is stored.

JP 2007-194860 A

  However, the metadata is likely to be the same information, and is not sufficiently reliable to determine whether or not the metadata has already been captured. Further, if the camera does not have a function of recording such information, it cannot be determined that the data has already been captured. Therefore, there is a possibility that an image having the same content as the already-acquired image may be acquired.

  Therefore, an object of the present invention is to further reduce the possibility that an already captured image is redundantly captured.

In order to achieve the above object, an information processing apparatus according to the present invention includes a receiving unit that receives a content from an external device, and a generation unit that generates identification information for uniquely identifying the content based on partial data of the content. Means, recording control means for associating the received content identification information with the content and recording the content on a recording medium, and when the receiving means receives the content from the external device, receives the entire data of the content. Receiving only the partial data of the content, generating the identification information by the generation unit based on the received partial data of the content, and comparing the generated identification information with the identification information of the content already recorded on the recording medium. and control means for controlling so that the control means, of the content as the partial data A part of data of the content so that it does not contain parameters that do not affect the contents requested to the external device, based on the result of the comparison, the control means, the entire data of the content by using the receiving means It is characterized by switching between controlling to receive the content and controlling not to receive the entire content data.

  According to the present invention, it is possible to further reduce the possibility that an already captured image is redundantly captured.

FIG. 2 is a block diagram of a media player and a digital camera according to the first embodiment. FIG. 3 is a conceptual diagram illustrating an example of information held by a media player according to the first embodiment. FIG. 4 is a sequence diagram for describing an outline of a communication procedure between the media player and the digital camera according to the first embodiment. 5 is a flowchart illustrating an operation of the media player according to the first embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. The embodiment described below is an example of a means for realizing the present invention, and may be appropriately modified or changed depending on the configuration of the apparatus to which the present invention is applied and various conditions. Further, the respective embodiments can be appropriately combined.

[First Embodiment]
<Configuration of each device>
FIG. 1 is a block diagram showing the configuration of the entire system of the first embodiment.

  Here, a media player will be described as an example of the information processing apparatus, and a digital camera will be described as an example of the information processing terminal. For example, the information processing device may be a set-top box or the like. Further, for example, the information processing terminal may be a so-called smartphone, tablet device, personal computer, or the like.

  First, the media player A100 will be described.

  The control unit A101 controls each unit of the media player A100 according to an input signal or a program. Note that instead of the control unit A101 controlling the entire apparatus, a plurality of hardware may share processing to control the entire apparatus.

  The memory A102 is used as a buffer memory for temporarily holding various data, a work area of the control unit A101, and the like.

  The non-volatile memory A103 is an electrically erasable and recordable non-volatile memory, and stores a program executed by the control unit A101 and the like.

  The recording medium A104 can record various data. The recording medium A104 may be configured to be detachable from the media player A100, or may be built in the media player A100. That is, the media player A100 only needs to have at least means for accessing the recording medium A104. The unit for accessing the recording medium A104 is an example of a recording control unit. In this embodiment, the content (still image and moving image data) received from the digital camera B100 is stored in the recording medium A104.

  The operation unit A105 is used to receive an instruction for the media player A100 from a user. The operation unit A105 includes, for example, a power button for instructing the user to turn on / off the power of the media player A100, and an operation button for instructing a screen transition. The operation unit A105 may include a light receiving element for receiving an infrared signal from the outside, and may be configured to receive an operation by a remote controller (not shown).

  The display interface A106 is an interface for outputting an image to the display device C100 (for example, a digital television). The output video is a GUI of a program executed by the media player A100 or a content stored in the recording medium A104. The display interface A106 includes, for example, an HDMI (registered trademark) output terminal. The control unit A101 generates a display control signal according to a program, and controls each unit of the media player A100 to generate a video signal to be output from the display interface A106.

  The communication unit A111 is a communication unit for realizing wireless communication. The communication unit A111 includes an antenna for wireless communication and a communication controller for processing wireless signals, and implements wireless communication according to the IEEE 802.11 standard (so-called wireless LAN). The control unit A101 controls the communication unit A111 to realize communication with the digital camera B100. Note that the wireless communication realized by the communication unit A111 is not necessarily a wireless LAN. As the wireless communication realized by the communication unit A111, for example, wireless communication in accordance with the standard of IEEE 802.15 (so-called Bluetooth (registered trademark)) can be adopted. Alternatively, wireless communication according to Bluetooth (registered trademark) Low Energy, which consumes less power, can be adopted.

  The above is the description of the media player A100.

  Next, the digital camera B100 will be described.

  The control unit B101 controls each unit of the digital camera B100 according to an input signal and a program. Note that, instead of the control unit B101 controlling the entire apparatus, a plurality of hardware may share the processing to control the entire apparatus.

  The memory B102 is used as a buffer memory for temporarily storing various data, a work area for the control unit B101, and the like.

  The non-volatile memory B103 is an electrically erasable and recordable non-volatile memory, and stores applications executed by the control unit B101 and the like.

  The recording medium B104 can record various data. The recording medium B104 may be configured to be detachable from the digital camera B100, or may be built in the digital camera B100. That is, the digital camera B100 only needs to have at least means for accessing the recording medium B104.

  The operation unit B105 is used to receive an instruction for the digital camera B100 from a user. The operation unit B105 includes, for example, a power button for the user to instruct power ON / OFF of the digital camera B100 and an operation button for instructing screen transition. In addition, a touch panel formed on a display unit B106 described later is also included in the operation unit B105.

  The display unit B106 displays a GUI (Graphical User Interface) for interactive operation. The display unit B106 does not necessarily need to be built in the digital camera B100. The digital camera B100 only needs to have at least a display control function for controlling display contents.

  The imaging unit B107 includes, for example, an optical lens unit, an optical system that controls aperture, zoom, focus, and the like, and an imaging element that converts light (video) introduced through the optical lens unit into an electrical video signal. Be composed. In general, a CMOS (Complementary Metal Oxide Semiconductor) or a CCD (Charge Coupled Device Image Sensor) is used as the imaging device. The imaging unit B107 is controlled by the control unit B101 to convert subject light formed by a lens included in the imaging unit B107 into an electric signal by an imaging element, perform noise reduction processing and the like, and convert digital data. Output as image data. In the digital camera B100 of the present embodiment, image data is recorded on the recording medium B104 according to the DCF (Design rule for Camera File system) standard.

  The communication unit B111 is a communication unit for realizing wireless communication. The communication unit B111 includes an antenna for wireless communication and a communication controller for processing wireless signals, and implements wireless communication according to the IEEE 802.11 standard. The control unit B101 controls the communication unit B111 to realize communication with the media player A100. For example, the media player A100 operates as an access point, and the digital camera B100 operates as a station, thereby realizing wireless LAN communication.

  Note that the wireless communication realized by the communication unit B111 does not necessarily have to be a wireless LAN. As the wireless communication realized by the communication unit B111, for example, wireless communication according to the standard of IEEE 802.15 (so-called Bluetooth (registered trademark)) or lower power consumption according to Bluetooth (registered trademark) Low Energy is adopted. Can be. When the communication unit B111 performs wireless communication according to Bluetooth (registered trademark) or Bluetooth (registered trademark) Low Energy with lower power consumption, for example, the media player A100 operates as a master and a central. Then, communication is realized by the digital camera B100 operating as a slave and a peripheral.

  The above is the description of the digital camera B100.

  Although FIG. 1 illustrates an example in which the media player A100 and the digital camera B100 communicate one-to-one, a plurality of digital cameras B100 communicate with one media player A100. May be.

  The media player A100 and the digital camera B100 may be configured to communicate via another wireless LAN access point.

<Overview of data>
Next, an outline of data used in the system according to the present embodiment will be described with reference to FIGS.

  FIG. 2 is an example of information stored in the nonvolatile memory A102 of the media player A100 to realize the system according to the first embodiment.

  The digital camera information 200 in FIG. 2A includes at least a combination of a model name 201, a UUID assignment 202, a partial data acquisition position 203, and a partial data acquisition size 204. The digital camera information 200 is stored in the nonvolatile memory A102 in advance when the media player A100 is manufactured. Alternatively, the digital camera information 200 may be updated when the media player A100 accesses a predetermined server via the public line (and the Internet) by the communication unit A111. The digital camera information 200 may be updated by the media player A100 communicating with the digital camera B100 via the communication unit A111. That is, the digital camera information 200 may be received from the digital camera B100 via the communication unit A111, and the internal data may be updated.

  The model name 201 is a name for uniquely specifying the type of the digital camera.

  The UUID assignment 202 indicates whether the digital camera has a function of assigning a UUID to the content.

  The partial data acquisition position 203 and the partial data acquisition size 204 are information indicating the position of the file from which the acquisition of the partial data is started and the size of the partial data to be acquired in the partial data acquisition processing described later. The partial data acquisition position 203 and the partial data acquisition size 204 are set so that a reduced image (so-called thumbnail) of the content is included in the area.

  2B includes at least a combination of a UUID 211, a pseudo UUID 212, a file name 213, a file size 214, and a shooting date / time 215. The content DB 210 is updated by the media player A100 when the media player A100 receives content from the digital camera B100 via the communication unit A111. The details of the content DB update process will be described later with reference to FIGS.

  The UUID 211 is an identifier for uniquely specifying the content, and is assigned to the content by the digital camera having the UUID assignment 202 of “Yes”. This UUID is composed of a combination of a unique serial number for each digital camera and an incremental number that is incremented each time a content is generated. The unique serial number for each individual is set at the time of manufacture. Further, the maximum value of the incremental number is secured to a sufficiently large value that it is not practical to saturate it. Therefore, the UUID 211 basically maintains sufficient uniqueness.

  Further, an image received from a digital camera having no function of assigning a UUID is managed as a state in which the content DB has no UUID. In the example of FIG. 2A, the UUID is assigned to the first to third contents from the top of the database, and the UUID is not assigned to the fourth to fifth contents.

  The pseudo UUID assignment 202 is identification information for the media player A 100 to uniquely specify the content, and is generated based on partial data acquired from the content by a partial data acquisition process described later. This pseudo UUID is associated with the content by the media player A100. The pseudo UUID generation / association processing will be described in detail later with reference to FIGS.

  The file name 213 is a name for specifying content in the file system, and is given by the digital camera.

  The file size 214 indicates the file size of the content.

  The shooting date and time 215 is information indicating the date and time when the content was shot, and is given by the digital camera.

  Next, the structure of the image data will be described. FIG. 2C is a conceptual diagram of a configuration of image data according to the present embodiment. This image data is, for example, data generated by the digital camera B100 or image data recorded on the recording medium A104 of the media player A100.

  The data structure of the image file according to the present embodiment uses Exif-JPEG as the image file format. However, the data structure of the image file, such as Exif-TIFF, RAW image, and moving image, has a data structure capable of recording metadata in the image file. Is possible. Note that Exif (Exchangeable image file format) is a format of image metadata for digital cameras formulated by JEIDA (Japan Electronic Industry Development Association).

  In Exif-JPEG250 in FIG. 2C, SOI251 is a marker indicating the start of Exif-JPEG250. APP1 252 is an application marker corresponding to the header part of Exif-JPEG250. The data block 253 is a data block including a quantization table (DQT), a Huffman table (DHT), a frame start marker (SOF), and a scan start marker (SOS). Compressed Data 254 is compressed data of the main image. The EOI 255 is a marker indicating the end of Exif-JPEG250.

  The APP1 252 is configured as shown by data blocks 256 to 262 in FIG. The data block 256 is a data block composed of APP1 Length indicating the size of APP1 252 and Exif Identifier Code indicating the identification code of APP1 252. The 0th IFD 257 is a data block that records additional information related to the compressed main image. For example, information on the model name 2571 of the digital camera that captured the image is included. A part of the 0th IFD 257 includes data blocks of the Exif IFD 258 and the GPS IFD 260.

  The Exif IFD 258 includes a tag related to an Exif version, a tag related to the characteristics and structure of image data, a tag related to an imaging date and time 2581, a tag related to an imaging condition in which a shutter speed and a lens focal length are recorded, and the like. Also, the Exif IFD 258 has a data block of MakerNote 259. MakerNote 259 records information unique to the maker that generated the file. For example, information such as time difference information 2591 and a serial number 2592 representing a unique number of the digital camera 100 used for imaging is included.

  The GPS IFD 260 is configured by tags related to GPS information. The position information such as latitude 2601 and longitude 2602 used in the present embodiment is recorded therein. The latitude 2601 is recorded in an area defined by a GPS latitude tag and a GPS latitude Ref tag of the GPS info IFD. The longitude 2602 is recorded in an area defined by a tag of GPSLongitude and a tag of GPSLongitudeRef.

  The first IFD 261 is a data block that records additional information related to a thumbnail image. Thumbnail 262 is thumbnail image data.

  The above is the description of the structure of the image data.

  As described above, in the example of FIG. 2C, the partial data acquisition position 203 described in the description of FIG. 2A starts acquisition of partial data from a number of KB from the beginning of the Exif-JPEG250 data. It indicates whether to do so. This is done for the following reason. That is, in the case of moving image data, for example, not only data relating to the contents of the moving image such as the shooting situation is recorded in the header area. For example, a content that is not related to the content of the moving image, such as a playback start position, is also included. However, if a parameter that is variable without affecting the content of such data is included in the header area, the file may be recognized as a different file even though the data content is the same. is there. Therefore, the acquisition start position of the partial data is set, and the pseudo UUID is generated by removing the variable portion. For example, in a device that does not handle such moving image data, the moving image data may always be obtained from the beginning of the data.

  The partial data acquisition size 204 described in the description of FIG. 2A is set to a size that includes a part of the Thumbnail 262 of the Exif-JPEG 250 in the example of FIG.

  The above is the outline of the data used in the system according to the present embodiment.

<System operation>
FIG. 3 is a sequence diagram illustrating a flow of processing of the system according to the present embodiment. The media player 301 has the same configuration as the media player A100, and the digital camera 302 has the same configuration as the digital camera B100. In FIG. 3, solid arrows indicate communication by wireless LAN.

  In step S311, the media player 301 and the digital camera 302 establish a connection via the wireless LAN.

  Upon establishing the wireless LAN connection, the media player 301 automatically sends a device information request to the digital camera 302 via the established wireless LAN connection in step S312.

  Upon receiving the device information request in S312, the digital camera 302 transmits a device information response to the media player 301 via the wireless LAN in step S313. The device information response transmitted here includes at least the model name of the digital camera 302.

  In step S314, the media player 301 transmits a content information list request to the digital camera 302 via the established wireless LAN connection.

  Upon receiving the content information list request in S314, the digital camera 302 transmits a content information list response to the media player 301 via the established wireless LAN connection in step S315. The digital camera 302 includes at least identifiers (hereinafter, object IDs) of all contents stored in the recording medium B104 in the content information list response.

  Next, in step S316, the media player 301 refers to the digital camera information 200 recorded on the recording medium, and determines whether the digital camera having the model name (the digital camera 302 currently communicating) received in step S313 has the UUID assigning function. Is determined.

  When it is determined that the digital camera 302 has the UUID assigning function, the media player 301 and the digital camera 302 repeat the fetched determination process of steps S317 to S320 for all contents included in the response to the content information list. On the other hand, if the determination result in step S316 is that no UUID is assigned, the media player 301 and the digital camera 302 repeat the capture completion determination process shown in steps S321 to S328 for all contents included in the content information list response. .

  First, steps S317 to S320 will be described.

  In step S317, the media player 301 transmits a UUID request to the digital camera 302 via the wireless LAN. The media player 301 includes at least the object ID received in step S315 in the UUID request. That is, the UUID of the image data specified by the object ID included in the request is requested.

  Upon receiving the UUID request in S317, the digital camera 302 transmits a UUID response to the media player 301 via the wireless LAN connection in step S318. The digital camera 302 includes at least the UUID of the content corresponding to the object ID received in step S317 in the UUID response.

  In step S319, the media player 301 refers to the content DB 210 and determines whether there is any content whose UUID received in step S317 matches. The media player 301 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist.

  If the result of the determination in step S319 is that there is a difference, in step S320, the media player 301 stores the object ID in the memory A102 as the content to be captured. If the result of the determination in step S319 is that there is no difference, the content has already been captured, and thus is not a capture target (the object ID is not stored in the memory A102).

  Subsequently, steps S321 to S328 will be described.

  In step S321, the media player 301 transmits a metadata request to the digital camera 302 via a wireless LAN connection. The media player 301 includes at least the object ID received in step S315 in the metadata request.

  Upon receiving the metadata request in S321, the digital camera 302 transmits a metadata response to the media player 301 via the wireless LAN connection in step S322. The digital camera 302 includes at least the file name, file size, and shooting date and time of the content corresponding to the object ID received in step S321 in the metadata response.

  In step S323, the media player 301 refers to the content DB 210 and determines whether there is any content whose file name, file size, and shooting date and time received in step S322 all match. The media player 301 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist.

  If it is determined that there is a difference, the process proceeds to step S328. On the other hand, if the result of the determination in step S323 is that there is no difference, the media player 301 and the digital camera 302 perform the processing shown in steps S324 to S328.

  In step S324, the media player 301 transmits a partial data request to the digital camera 302 via the wireless LAN connection. The media player 301 includes at least the object ID, the partial data acquisition position, and the partial data acquisition size received in step S315 in the partial data request. The media player 301 determines the partial data acquisition position and the partial data acquisition size with reference to the model name and the digital camera information 200 received in step S313.

  Upon receiving the partial data request in S324, the digital camera 302 transmits a partial data response to the media player 301 via the wireless LAN connection in step S325. The digital camera 302 cuts out the data of the specified position and size from the content corresponding to the object ID received in step S321, and includes it in the partial data response.

  In step S326, the media player 301 generates a pseudo UUID based on the partial data received in step S325. For example, the media player 301 generates a hash value of the partial data as a pseudo UUID. Alternatively, the media player 301 may use the binary data of the partial data as a pseudo UUID as it is.

  In step S327, the media player 301 refers to the content DB 210 and determines whether or not there is a content whose pseudo UUID generated in step S326 matches. The media player 301 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist.

  If the result of the determination in step S327 is that there is a difference, in step S328, the media player 301 stores the object ID in the memory A102 as a target for capturing the content.

  Subsequently, the media player 301 and the digital camera 302 repeat the capturing process shown in steps S329 to S333 for all the content stored as the capturing target in step S320 or step S328.

  In step S329, the media player 301 transmits a content request to the digital camera 302 via a wireless LAN connection. The media player 301 includes at least the object ID of the content to be captured in the content request.

  Upon receiving the content request in S329, the digital camera 302 transmits a content response to the media player 301 via the established wireless LAN connection in step S330. The digital camera 302 includes, in the content response, at least content data corresponding to the object ID received in step S317 and metadata of the content (file name, file size, shooting date and time, etc.). If the digital camera 302 has a UUID assignment function, the digital camera 302 includes the UUID of the content in the content response.

  In step S331, the media player 301 stores the content data received in step S330 in the recording medium A104, and further stores the received metadata and UUID in the content DB 210.

  In step S332, the media player 301 cuts out partial data from the content stored in the recording medium A104 in step S331, and generates a pseudo UUID. The media player 301 determines the acquisition position and size of the partial data with reference to the model name and the digital camera information 200 received in step S313. The media player 301 generates a pseudo UUID by the same method as in step S326. If the pseudo UUID has already been generated in step S326, the media player 301 omits the processing in step S332.

  Finally, in step S333, the media player 301 stores the pseudo UUID generated in step S326 or step S332 in the content DB 210.

  As described above, when capturing the content from the digital camera B100, the media player A100 of the present embodiment receives a part of the content data, generates a pseudo UUID, and uses the pseudo UUID to determine whether the content has been captured. Accordingly, the media player A100 can easily and quickly determine that the content has been captured even when capturing the content from the digital camera B100 having no UUID assignment function.

<Operation of the device>
Subsequently, a detailed operation of the media player for realizing the above operation will be described with reference to FIG.

  FIG. 4 is a flowchart illustrating the operation of the media player A100 of the present embodiment. Note that the processing shown in this flowchart is realized by the control unit A101 of the media player A100 controlling each unit of the media player A100 according to an input signal or a program.

  In step S401, the control unit A101 establishes a wireless LAN connection with the digital camera B100 via the communication unit A111. The process in this step corresponds to the process in step S311 in FIG.

  In step S402, the control unit A101 transmits a device information request to the digital camera B100 via the communication unit A111. The process in this step corresponds to the process in step S312 in FIG.

  In step S403, the control unit A101 determines whether a device information response has been received from the digital camera B100 via the communication unit A111. When determining that the device information response has been received, the control unit A101 shifts the processing to step S404, and when it determines that the device information response has not been received, repeats step S403.

  In step S404, control unit A101 transmits a content information list request to digital camera B100 via communication unit A111. The process in this step corresponds to the process in step S314 in FIG.

  In step S405, control unit A101 determines whether a content information list response has been received from digital camera B100 via communication unit A111. When determining that the content information list response has been received, the control unit A101 shifts the processing to step S406, and when determined that it has not received the content information list response, repeats step S405 again.

  In step S406, the control unit A101 refers to the digital camera information 200, and determines whether the digital camera having the model name included in the device information response received in step S403 has a UUID assigning function. The process of this step corresponds to the process of step S316 in FIG. If the control unit A101 determines that the UUID has been added, the control unit A101 repeats the loaded completion determination processing shown in steps S407 to S410 for all the contents included in the content information list response. On the other hand, if the control unit A101 determines that there is no UUID, the control unit A101 repeats the import completion determination process in steps S411 to S418 for all the contents included in the content information list response.

  In step S407, control unit A101 transmits a UUID request to digital camera B100 via communication unit A111. The control unit A101 includes at least the object ID included in the content information list response received in step S405 in the UUID request. The process in this step corresponds to the process in step S317 in FIG.

  In step S408, the control unit A101 determines whether a UUID response has been received from the digital camera B100 via the communication unit A111. When determining that the UUID response has been received, the control unit A101 shifts the processing to step S409, and when determined that it has not received the UUID response, repeats step S408 again.

  In step S409, the control unit A101 refers to the content DB 210 and determines whether there is any content whose UUID received in step S408 matches. The control unit A101 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist. The process of this step corresponds to the process of step S319 in FIG. When the control unit A101 determines that there is a difference, the process proceeds to step S410. On the other hand, when the control unit A101 determines that there is no difference, the control unit A101 ends the capture completion determination process for the content.

  In step S410, the control unit A101 stores the content in the memory A102 as a capture target. The process of this step corresponds to the process of step S320 in FIG.

  In step S411, the control unit A101 transmits a metadata request to the digital camera B100 via the communication unit A111. The control unit A101 includes at least the object ID included in the content information list response received in step S405 in the metadata request. The process in this step corresponds to the process in step S321 in FIG.

  In step S412, control unit A101 determines whether a metadata response has been received from digital camera B100 via communication unit A111. If the control unit A101 determines that the metadata response has been received, the process proceeds to step S413. If it determines that the metadata response has not been received, the control unit A101 repeats step S412 again.

  In step S413, the control unit A101 refers to the content DB 210, and determines whether there is any content whose file name, file size, and shooting date and time included in the metadata response received in step S412 all match. The control unit A101 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist. The process in this step corresponds to the process in step S323 in FIG. When determining that there is no difference, the control unit A101 shifts the processing to step S414. On the other hand, if the control unit A101 determines that there is a difference, the process proceeds to step S418.

  In step S414, control unit A101 transmits a partial data request to digital camera B100 via communication unit A111. The control unit A101 includes at least the object ID, the partial data acquisition position, and the partial data acquisition size included in the content information list response received in step S405 in the partial data request. The control unit A101 determines the partial data acquisition position and the partial data acquisition size with reference to the model name and the digital camera information 200 included in the device information response received in step S403. The process of this step corresponds to the process of step S324 in FIG.

  In step S415, control unit A101 determines whether a partial data response has been received from digital camera B100 via communication unit A111. When determining that the partial data response has been received, the control unit A101 shifts the processing to step S416, and when determined that the partial data response has not been received, repeats step S415 again.

  In step S416, control unit A101 generates a pseudo UUID based on the partial data received in step S415. For example, the control unit A101 generates a hash value of the partial data as a pseudo UUID. Alternatively, the control unit A101 may use the partial data as it is as a pseudo UUID. The process in this step corresponds to the process in step S326 in FIG.

  In step S417, the control unit A101 refers to the content DB 210 and determines whether there is any content whose pseudo UUID generated in step S416 matches. The control unit A101 determines that there is no difference when the content exists, and determines that there is a difference when the content does not exist. The process in this step corresponds to the process in step S327 in FIG. When determining that there is a difference, the control unit A101 shifts the processing to step S418. On the other hand, if the control unit A101 determines that there is no difference, the control unit A101 ends the capture completion determination process for the content, and loops the process from S411 if there is another content to be determined.

  In step S418, the control unit A101 stores the content in the memory A102 as an acquisition target. The process in this step corresponds to the process in step S328 in FIG.

  When the control unit A101 completes the capture completion determination processing for all the contents, the control unit A101 repeats the capture processing shown in steps S419 to S423 for all the contents stored as the capture targets in step S410 or step S418.

  In step S419, control unit A101 transmits a content request to digital camera B100 via communication unit A111. The control unit A101 includes at least the object ID of the content to be captured in the content request. The process in this step corresponds to the process in step S329 in FIG.

  In step S420, control unit A101 determines whether a content response has been received from digital camera B100 via communication unit A111. When determining that the content response has been received, the control unit A101 shifts the processing to step S421, and when it determines that the content response has not been received, repeats step S420 again. Here, the entire content data including the partial data is received.

  In step S421, the control unit A101 stores the content data included in the content response received in step S420 in the recording medium A104, and further stores the received metadata and UUID in the content DB 210. The process in this step corresponds to the process in step S331 in FIG.

  In step S422, the control unit A101 cuts out partial data from the content stored in the recording medium A104 in step S421, and generates a pseudo UUID. The control unit A101 refers to the model name and the digital camera information 200 included in the device information response received in step S403, and determines the acquisition position and size of the partial data. The control unit A101 generates a pseudo UUID by the same method as in step S416. If the pseudo UUID has already been generated in step S416, the control unit A101 may divert the pseudo UUID and omit the processing in step S422. The process of this step corresponds to the process of step S332 in FIG.

  In step S423, control unit A101 stores the pseudo UUID generated in step S422 in content DB 210 and associates the pseudo UUID with the content. The process in this step corresponds to the process in step S333 in FIG.

  As described above, the media player A100 of the present embodiment receives a part of data of a content, generates a pseudo UUID, and uses the content to determine whether the content has been captured when the content is captured from the digital camera B100. Accordingly, the media player A100 can easily and quickly determine that the content has been captured even when capturing the content from the digital camera B100 having no UUID assignment function.

[Other Embodiments]
In the above-described embodiment, an example has been described in which content is fetched from a digital camera via a wireless LAN, but a configuration via other communication means may be used. For example, a configuration may be employed in which a media player and a digital camera are connected by wire using a USB (Universal Serial Bus) cable. Alternatively, a configuration may be adopted in which a storage medium such as an SD card or a CF card is inserted into a media player to capture content. In this case, a step of determining whether or not the capture source is a card is added, and in the case of a card, processing is performed without the UUID generation function.

  In the above embodiment, the case where the acquisition position / size of the partial data is set for each digital camera model has been described as an example. However, the configuration is such that the acquisition position / size is changed according to the format of the content. Is also good.

  In the above-described embodiment, an example has been described in which the capture completion determination is performed using the UUID generated on the digital camera side. However, the incremental number is reset by the initialization of the digital camera. Therefore, the uniqueness of the UUID may not be maintained. In particular, when content is transmitted to the outside of the digital camera, uniqueness is not always maintained for the recipient. Therefore, even when the digital camera has a function of generating a UUID, it is possible to determine whether or not the pseudo UUID has been captured. As a result, it is possible to more reliably determine the completion of capture.

  The present invention is also realized by executing the following processing. That is, software (program) for realizing the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU or MPU or the like) of the system or apparatus reads out the program code and This is the process to be performed. In this case, the program and a storage medium storing the program constitute the present invention.

Claims (11)

Receiving means for receiving content from an external device;
Generating means for generating identification information for uniquely identifying the content based on the partial data of the content,
Recording control means for recording the received content identification information and the content in a recording medium in association with each other,
When receiving the content from the external device by the receiving unit, before receiving the entire data of the content, only the partial data of the content is received, and the generation is performed based on the received partial data of the content. Control means for generating the identification information by means and controlling to compare with the identification information of the content already recorded on the recording medium,
The control means requests the external device for partial data of the content so that a parameter that does not affect the content of the content is not included as the partial data,
Based on the result of the comparison, the control unit switches between controlling to receive the entire data of the content using the receiving unit or controlling not to receive the entire data of the content. Information processing device.   If the identification information does not match as a result of the comparison, the control means controls the reception means to receive the entire data of the content, and as a result of the comparison by the control means, the identification information is The information processing apparatus according to claim 1, wherein when the data matches, control is performed so as not to receive the entire data of the content. The information processing apparatus according to claim 1, wherein the content is image data, and the partial data includes at least a part of a thumbnail of the image data. Wherein, from the head of data of the content, to request some data to said external device from a data position excluding the predetermined size of so that it does not contain parameters that do not affect the contents of the content The information processing apparatus according to claim 1, wherein: The content is video data,
The information processing device according to claim 1, wherein the partial data is data that does not include reproduction position information of the moving image data.   The information processing apparatus according to claim 1, wherein the partial data includes metadata other than a thumbnail of the content.   The information processing apparatus according to claim 1, wherein the identification information is a hash value of the partial data. When establishing a connection with the external device, the receiving means receives device information from the external device,
8. The apparatus according to claim 1, wherein the control unit determines an acquisition position and a size of the partial data based on a model name and digital camera information included in the received device information. 9. Information processing device. The control unit further determines, before receiving only the partial data of the content, whether the external device has a function of generating the identification information,
When determining that the external device has a function of generating the identification information,
Controlling to receive the identification information without receiving the partial data of the content,
When determining that the external device does not have a function of generating the identification information,
The information processing apparatus according to any one of claims 1 to 8, wherein control is performed such that only partial data of the content is received from the external apparatus. A receiving step of receiving content from an external device;
A generation step of generating identification information for uniquely specifying the content based on the partial data of the content,
A recording control step of recording the received content identification information and the content in a recording medium in association with each other,
Before receiving the entire data of the content in the receiving step, only the partial data of the content is received, the identification information is generated based on the received partial data of the content, and the identification information is already recorded on the recording medium. A control step of controlling to compare with the identification information of the content;
Requesting the external device for partial data of the content so that a parameter that does not affect the content of the content is not included as the partial data,
Controlling whether to receive the entire data of the content or control to not receive the entire data of the content based on the result of the comparison.   A computer-readable program for causing a computer to function as each unit of the information processing apparatus according to claim 1.

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