JP2015233183A - Imaging device having radio communication function, communication system, and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of shortening a time from connecting a mobile terminal with the imaging device and to displaying an image list.SOLUTION: An imaging device comprises: a first communication processing unit for performing communication in accordance with a first communication mode; a second communication processing unit for performing, in accordance with a second communication mode, preparation for establishing connection in accordance with the first communication mode; and an image file management unit for managing an image file obtained by photographing. The second communication processing unit transmits management information on an image file to an external terminal when it performs, in accordance with the second communication mode, interaction of preparation for establishing connection with the external terminal in accordance with the first communication mode.

Description

  The present invention relates to an imaging device with a wireless communication function, a communication system including an imaging device with a wireless communication function and a portable terminal, and a communication control method.

  In recent years, digital cameras equipped with a wireless communication function are becoming popular. By connecting a portable terminal to a digital camera with a wireless communication function, information acquired from the digital camera can be displayed on the display screen of the portable terminal. As an example, according to such a system, an image stored in a digital camera can be displayed on a display screen of a portable terminal. Patent Document 1 describes a configuration in which usage start information is displayed on a smartphone when the smartphone and the digital camera are connected by the proximity wireless communication function.

JP 2010-136016 A

  In the conventional communication system as described above, a situation is assumed in which a user displays an image list stored in a digital camera on a mobile phone. In the conventional system, the mobile phone needs to acquire an image list from the digital camera every time the mobile phone is connected to the digital camera. For this reason, there is a problem that it takes a while until the image list is displayed after the mobile phone is connected to the digital camera.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an imaging apparatus and a communication system that can shorten the time from when the portable terminal is connected to the imaging apparatus until the image list is displayed. And providing a communication control method.

  An imaging apparatus according to an embodiment of the present invention performs preparations for establishing a connection using a first communication method with a first communication processing unit that performs communication using a first communication method using a second communication method. A second communication processing unit; and an image file management unit that manages the captured image file. The second communication processing unit transmits management information of the image file to the external terminal when exchanging preparations for establishing a connection with the first communication method with the external terminal using the second communication method. Send.

  According to the said structure, after connecting a portable terminal to an imaging device, an image list can be displayed immediately.

  As an example, the first communication method is Wi-Fi communication, the second communication method is NFC (Near Field Communication), and the image file management information is information related to the last update date and time of the image file.

  When the second communication processing unit prepares to establish a connection with the external terminal using the first communication method using the second communication method, the second communication processing unit transmits the camera setting information of the imaging apparatus to the external terminal. The structure which transmits may be sufficient.

  When the second communication processing unit performs preparation for establishing a connection with the external terminal using the first communication method using the second communication method, the second communication processing unit transmits the camera usage status information of the imaging apparatus to the external terminal. It may be configured to transmit to.

  In addition, a communication system according to an embodiment of the present invention includes a first communication processing unit that performs communication using a first communication method, and a preparation for establishing a connection using the first communication method. And a second communication processing unit configured to manage the captured image file, and the second communication processing unit establishes communication with the external terminal using the first communication method. For exchanging preparations for communication using the second communication method, transmitting image file management information to an external terminal, and exchanging preparations for connection using the first communication method between the imaging device and the imaging device In the second communication method, and at the time of the exchange, the communication processing unit that receives the management information of the image file of the imaging device, the image cache unit that caches the display image of the image list, and the image file from the imaging device Receive management information The cached image list is determined when the validity of the cached image list is determined based on the received management information of the image file, and the cached image list is determined to be valid. A portable terminal comprising an image list display control unit for displaying the display images.

  According to the above configuration, the image list can be displayed immediately after the mobile terminal is connected to the digital camera.

  The communication processing unit of the mobile terminal displays the display image of the cached image list even when it is determined that the cached image list is not valid, receives the latest image file, The displayed image list may be replaced with the image list of the received image file for display.

  The communication processing unit of the mobile terminal obtains only the display image corresponding to the difference from the digital camera by comparing the latest management information of the received image file with the management information of the previously received image file and obtaining the difference. It may be a configuration.

  In addition, a communication control method according to an embodiment of the present invention includes a first communication processing unit that performs communication using a first communication method, and a preparation for establishing a connection using the first communication method. It is the communication control method performed in a communication system provided with an imaging device provided with the 2nd communication processing part performed by a system, and a portable terminal provided with a communication processing part. In the communication control method, the image file management information is transmitted to the imaging device when the preparation for exchanging the communication with the external terminal using the first communication method is performed using the second communication method. The management information of the image file of the imaging device is received when the step of transmitting to the external terminal and the exchange of the preparation for connection by the first communication method are performed with the imaging device in the second communication method. And the step of caching the display image of the image list in the portable terminal, and the portable terminal is cached based on the received management information of the image file in response to the reception of the management information of the image file from the imaging device. When the validity of the image list is determined and it is determined that the cached image list is valid, the display image of the cached image list And displaying, the.

  According to the above configuration, the image list can be displayed immediately after the mobile terminal is connected to the digital camera.

  As described above, according to the present invention, it is possible to shorten the time from when the portable terminal is connected to the digital camera to when the image list is displayed.

It is a block diagram which shows the structure of the communication system of this embodiment of this invention. It is a block diagram which shows the hardware constitutions of the digital camera of this embodiment of this invention. It is a block diagram which shows the hardware constitutions of the portable terminal of embodiment of this invention. It is a figure for demonstrating the software structure of a digital camera. It is a figure for demonstrating the software structure of a portable terminal. 6 is a sequence diagram illustrating communication processing between the mobile terminal and the digital camera in Embodiment 1. FIG. FIG. 10 is a sequence diagram illustrating communication processing between a mobile terminal and a digital camera in Embodiment 2. FIG. 10 is a sequence diagram illustrating communication processing between a mobile terminal and a digital camera according to a third embodiment. FIG. 10 is a sequence diagram illustrating communication processing between a mobile terminal and a digital camera according to a fourth embodiment. FIG. 10 is a sequence diagram illustrating communication processing between a mobile terminal and a digital camera according to a fifth embodiment. It is a figure which shows an example of the state by which the thumbnail was displayed on the display screen of a portable terminal. It is a figure which shows the example of the starting screen of the camera remote control application which is one of the applications of a portable terminal.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, as an embodiment of the present invention, a communication system 1 including a digital single-lens reflex camera with a wireless communication function (hereinafter simply referred to as “digital camera”) 100 and a portable terminal 200 will be described. FIG. 1 shows a configuration of a communication system 1 according to the present embodiment. The digital camera 100 is not limited to a digital single-lens reflex camera. For example, a digital camera such as a mirrorless single-lens camera, a compact digital camera, a camcorder, a tablet terminal, a PHS (Personal Handy phone System), a smartphone, a feature phone, a portable game machine, It may be replaced with another type of apparatus in which the camera function and the wireless communication function are integrated. In addition, the mobile terminal 200 may be replaced with another type of device having a display function and a communication function, such as a notebook PC, a tablet terminal, a PHS, a smartphone, a feature phone, and a portable game machine.

[Configuration of Digital Camera 100]
FIG. 2 is a block diagram illustrating a hardware configuration of the digital camera 100 according to the present embodiment. As shown in FIG. 1, a digital camera 100 includes a CPU (Central Processing Unit) 101, an operation unit 102, an aperture / shutter driving circuit 104, a photographing lens 106, an aperture 108, a shutter 110, an image sensor 112, and a signal processing circuit 114. An image processing engine 116, a buffer memory 118, an LCD (Liquid Crystal Display) 124, a ROM (Read Only Memory) 126, and a nonvolatile memory 127. Further, the digital camera 100 includes a communication interface (hereinafter referred to as “NFC interface”) 131 that provides an NFC (Near Field Communication) function and a communication interface (hereinafter referred to as “Wi”) that provides a Wi-Fi wireless communication function. (Referred to as “-Fi interface”) 132. Note that NFC (Near Field Communication) automatically controls communication when a predetermined condition is met with respect to a communication distance or the like, and Wi-Fi wireless communication is a communication that is activated with a user operation. Control is done.

  The operation unit 102 includes various switches necessary for the user to operate the digital camera 100 such as a power switch, a release switch, and a shooting mode switch. When the user presses the power switch, power is supplied from a battery (not shown) to various circuits of the digital camera 100 through a power line. After supplying power, the CPU 101 accesses the ROM 126 to read out a control program, load it into a work area (not shown), and execute the loaded control program to control the entire digital camera 100.

  When the release switch is operated, the CPU 101 drives the aperture and shutter so that an appropriate exposure can be obtained based on a photometric value measured by a TTL (Through The Lens) exposure meter (not shown) built in the digital camera 100. The diaphragm 108 and the shutter 110 are driven and controlled via the circuit 104. More specifically, drive control of the aperture 108 and the shutter 110 is performed based on an AE function designated by a shooting mode switch, such as a program AE (Automatic Exposure), shutter speed priority AE, aperture priority AE, or the like. The CPU 101 performs AF (Autofocus) control together with AE control. An active method, a phase difference detection method, a contrast detection method, or the like is applied to the AF control. Since the configuration and control of this type of AE and AF are well known, detailed description thereof is omitted here.

  The light flux from the subject passes through the photographing lens 106, the diaphragm 108, and the shutter 110 and is received by the image sensor 112. The image sensor 112 is a single-plate color CCD (Charge Coupled Device) image sensor having, for example, a Bayer pixel arrangement, accumulates an optical image formed by each pixel on the light receiving surface as a charge corresponding to the amount of light, and R It is converted into an imaging signal corresponding to each color of (Red), G (Green), and B (Blue) and output to the signal processing circuit 114. The image sensor 112 may be another imager such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

  The signal processing circuit 114 performs predetermined signal processing such as clamping and demosaicing on the electrical signal (photographed data) input from the image sensor 112 and outputs the processed signal to the image processing engine 116. The image processing engine 116 performs predetermined signal processing such as matrix operation, Y / C separation, and white balance on the signal input from the signal processing circuit 114 to generate a luminance signal Y and color difference signals Cb and Cr, The image is compressed in a predetermined format such as JPEG (Joint Photographic Experts Group). The buffer memory 118 is used as a temporary storage location for processing data when the image processing engine 116 executes processing. The captured image storage format is not limited to the JPEG format, and may be a RAW format in which minimal image processing (for example, clamping) is performed.

  The image processing engine 116 stores the generated compressed image signal (captured image data) in, for example, a built-in memory (not shown) provided in the digital camera 100.

  Further, the image processing engine 116 buffers the generated luminance signal Y and color difference signals Cb and Cr in a frame memory (not shown) in units of frames. The image processing engine 116 sweeps the buffered signal from each frame memory at a predetermined timing, converts it into a video signal of a predetermined format, and outputs it to the LCD 124. The LCD 124 modulates and controls the liquid crystal panel based on the image signal input from the image processing engine 116. Thereby, the photographed image of the subject is displayed on the display screen of the LCD 124. The user can view through the display screen of the LCD 124 a real-time through image captured with appropriate brightness and focus based on AE control and AF control.

  When the user performs a reproduction operation of the captured image, the image processing engine 116 reads the captured image data designated by the operation from the built-in memory, converts it into an image signal of a predetermined format, and outputs it to the LCD 124. The LCD 124 modulates and controls the liquid crystal panel based on the image signal input from the image processing engine 116, so that a captured image of the subject is displayed on the display screen of the LCD 124.

[Configuration of mobile terminal 200]
FIG. 3 is a block diagram illustrating a hardware configuration of the mobile terminal 200. As illustrated in FIG. 3, the mobile terminal 200 includes a CPU 201, a main storage device 202, a nonvolatile memory 203, a touch panel 210, and an LCD 211. The portable terminal 200 further includes a communication interface (hereinafter referred to as “NFC interface”) 221 that provides an NFC (Near Field Communication) function, and a communication interface (hereinafter referred to as “Wi”) that provides a Wi-Fi wireless communication function. -Fi interface ") 222) is mounted. For convenience of explanation, FIG. 3 illustrates components related to the embodiment of the present invention among components as a mobile terminal.

  FIG. 4 is a diagram for explaining a software configuration of the digital camera 100. As illustrated in FIG. 4, the digital camera 100 includes, as software function blocks, a camera processing unit 171 that performs various processes necessary for a digital camera such as shooting control, and an image file management unit 172 that manages image files. . The digital camera 100 further controls NFC communication processing unit 181 that controls NFC communication performed via the NFC interface 131 and Wi-Fi wireless communication performed via the Wi-Fi interface 132 as software function blocks. A Wi-Fi communication processing unit 182 is included.

  The image file management information 161 includes, for example, the number of image files, the last update date and time, and the total capacity of the image files.

  Under the control of the camera processing unit 171, camera setting information 191 and a camera usage status 192 are generated and managed in the nonvolatile memory 127. The camera setting information 191 includes, for example, an aperture value, a shutter speed value, an ISO sensitivity value, and an exposure correction value. The camera usage status 192 includes, for example, the number of camera activations, the number of shutters, and the usage frequency for each function.

  FIG. 5 is a diagram for explaining a software configuration of the mobile terminal 200. As illustrated in FIG. 5, the mobile terminal 200 caches an image list display unit 251 for displaying an image list on the display screen (LCD 211) of the mobile terminal 200 and an image file (display image 271) acquired from the digital camera 100. The image cache unit 252 is provided. The portable terminal 200 further controls NFC communication processing unit 281 that controls NFC communication performed via the NFC interface 221 and Wi-Fi wireless communication performed via the Wi-Fi interface 222 as software function blocks. A Wi-Fi communication processing unit 282 is included.

  Hereinafter, five examples relating to wireless connection between the digital camera 100 and the portable terminal 200 will be described.

[Example 1]
The first embodiment is an example in which pairing of the digital camera 100 and the mobile terminal 200 to the Wi-Fi connection is performed by NFC (Near Field Communication). FIG. 6 is a sequence diagram illustrating communication processing between the mobile terminal 200 and the digital camera 100 according to the first embodiment. In FIG. 6 (and a similar sequence diagram shown below), software components (image file management unit 172, camera processing unit 171, NFC communication processing unit 181, Wi-Fi) in the digital camera 100 and the mobile terminal 200 are shown. A processing sequence with the communication processing unit 182) is shown.

  The mobile terminal 200 performs short-range wireless connection with the digital camera 100 via the NFC communication processing unit 181 in order to acquire connection information for performing Wi-Fi connection with the digital camera 100, and Wi- A Fi connection information request is transmitted to the NFC communication processing unit 181 (processing step S1). The Wi-Fi connection information request is passed from the NFC communication processing unit 181 to the Wi-Fi communication processing unit 182 (processing step S2), whereby the Wi-Fi connection information is transferred from the Wi-Fi communication processing unit 182 to the NFC communication. The data is transferred to the processing unit 181 (processing step S3). Wi-Fi connection information includes SSID (Service Set Identifier), key information, and the like.

  At this time, the NFC communication processing unit 181 of the digital camera 100 generates a management file information request to acquire management file information (image file management information) and transmits it to the image file management unit 172 (processing step S4). In response to the management file information request, the image file management unit 172 passes the management file information to the NFC communication processing unit 181 (processing step S5). The NFC communication processing unit 181 transmits the received Wi-Fi connection information and management file information to the mobile terminal 200 (processing step S6). The management file information is the date and time when the file of the digital camera 100 was last updated. The management file information may include the number of image files, the total image file size, the hash value of the image file, and the like.

  The mobile terminal 200 establishes a Wi-Fi connection with the digital camera 100 based on the acquired Wi-Fi connection information.

  The portable terminal 200 generates an image list request to display an image list of image files stored in the digital camera 100, and transmits the image list request to the Wi-Fi communication processing unit 182 of the digital camera 100 (processing step S7). The image list request is transferred to the image file management unit 172 (processing step S8). The image file management unit 172 acquires management file information together with the image list, and transmits the image list and management file information to the mobile terminal 200 via the Wi-Fi communication processing unit 182 (processing steps S9 and S10). .

  Next, the portable terminal 200 transmits a thumbnail request for requesting the digital camera 100 for thumbnails of images included in the acquired image list (processing step S11). In the digital camera 100, the thumbnail request received by the Wi-Fi communication processing unit 182 is passed to the image file management unit 172 (processing step S12). Receiving the thumbnail request, the image file management unit 172 transmits the thumbnail of the image file stored in the digital camera 100 to the portable terminal 100 via the Wi-Fi communication processing unit 182 (processing steps S13 and S14).

  The mobile terminal 200 displays the received thumbnail (image list) on the display screen of the mobile terminal 200 (processing step S15). FIG. 11 shows an example of a state in which thumbnails are displayed on the display screen of the mobile terminal 200 through such processing.

  At this time, the portable terminal 200 caches the acquired thumbnail in the image cache unit 252 (processing step S16), and stores the acquired management file information in the nonvolatile memory 203 (processing step S17).

  After that, it is assumed that the connection with the digital camera 100 is released, the mobile terminal 200 is turned off, and a certain time has passed. In the meantime, it is assumed that a new image is not taken by the digital camera.

  Next, when the portable terminal 200 is activated, the portable terminal 200 acquires management file information when connected to the digital camera 100 by NFC (Near Field Wireless) as in the first activation (processing steps S31 to S36). ). Note that the processing contents of the processing steps S31 to S36 are the same as the processing steps S1 to S6 described above, and thus detailed description thereof is omitted.

  The portable terminal 200 compares the management file information acquired this time in processing step S36 with the management file information stored in the nonvolatile memory 203 (processing step S37). When the management file information acquired this time and the management file information stored in the nonvolatile memory 203 are the same, the mobile terminal 200 stores the image in the digital camera 100 and the image cache unit 252. Therefore, the cached thumbnail can be used, and the mobile terminal 200 can immediately display the image list (thumbnail image) to the user by the image list display unit 251. (Processing step S38). As information for determining the validity of the image list (thumbnail image), information related to differences in the image list may be used in addition to the date and time.

  Note that when the Wi-Fi connection is established with the digital camera 100, the mobile terminal 200 cannot know whether a new image has been shot with the digital camera 100 in the prior art. It is necessary to obtain an image list and a thumbnail again to match the images in the digital camera 100 with the images cached in the mobile terminal 200. On the other hand, according to the present embodiment, when the mobile terminal 200 is activated next time, the mobile terminal 200 quickly acquires management file information through NFC (Near Field Wireless) connection, and uses the cached thumbnail as a user. Can be displayed immediately.

  If a new image is taken with the digital camera 100 while the mobile terminal 200 is powered off, the management file information is updated in the digital camera 100. Accordingly, the mobile terminal 200 can know that there is a difference between the thumbnail cache of the mobile terminal 200 and the image in the digital camera 100 at the next short-range communication.

  According to the above configuration of the first embodiment, by storing the image file information (image list) and caching the thumbnail, the image list can be displayed immediately after the portable terminal 200 is connected to the digital camera 100. it can.

[Example 2]
The second embodiment is an example in which camera setting information of the digital camera 100 is acquired when the mobile terminal 200 performs pairing for Wi-Fi connection with the digital camera 100 by NFC (Near Field Communication). FIG. 7 is a sequence diagram illustrating communication processing between the mobile terminal 200 and the digital camera 100 according to the second embodiment. The camera processing unit 171 of the digital camera 100 updates the camera setting information stored in the nonvolatile memory 203 every time camera setting information such as an aperture value is updated (processing step S40).

  Similar to the processing steps S1 to S3 in the first embodiment, the mobile terminal 200 performs NFC (Near Field Communication) connection with the digital camera 100 in order to acquire connection information for Wi-Fi connection, and Wi- Fi connection information is requested (processing steps S41 to S43). At that time, in the digital camera 100, the NFC communication processing unit 181 generates a camera setting information request, thereby acquiring camera setting information (processing steps S44 and S45). The camera setting information is included in the mobile terminal together with the Wi-Fi connection information. 200 (processing step S46).

  A Wi-Fi connection is established between the mobile terminal 200 and the digital camera 100 through the above processing steps. Using the received camera setting information, the mobile terminal 200 can start an application in a state in which the current setting information of the digital camera 100 is reflected. FIG. 12 shows a state in which the camera remote control application which is one of the applications of the mobile terminal 200 is activated while reflecting the received camera setting information (processing step S51).

  Specifically, in the display areas D1, D2, D3, and D4 on the remote control operation screen of FIG. 12, aperture value, shutter speed, ISO sensitivity value, and exposure correction, which are information received from the digital camera 100 as camera setting information. The value is displayed.

  According to the configuration of the second embodiment, since the camera setting information is acquired immediately after the portable terminal 200 is connected to the digital camera, the portable terminal 200 reflects the current camera setting information. Can be started. That is, it is possible to reduce standby time for preparation when the mobile remote controller 200 starts the camera remote control application. In addition, the said process of Example 2 may be performed as a part of above-mentioned process (process step S1-S6) in Example 1. FIG. Note that the features of the second embodiment can be applied to various applications.

[Example 3]
The third embodiment is an example in which the camera usage status of the digital camera 100 is acquired when the mobile terminal 200 performs pairing for Wi-Fi connection with the digital camera 100 by NFC (Near Field Communication). FIG. 8 is a sequence diagram illustrating communication processing between the mobile terminal 200 and the digital camera 100 according to the third embodiment. The camera processing unit 171 of the digital camera 100 updates the camera usage status stored in the nonvolatile memory 203 every time the digital camera 100 is used (processing step S60).

  Similar to the processing steps S1 to S3 in the first embodiment, the mobile terminal 200 performs NFC (Near Field Communication) connection with the digital camera 100 in order to acquire connection information for Wi-Fi connection, and Wi- Fi connection information is requested (processing steps S61 to S63). At that time, in the digital camera 100, the NFC communication processing unit 181 generates a camera usage status request to acquire the camera usage status (processing steps S64 and S65), and the camera usage status is a mobile terminal together with Wi-Fi connection information. 200 (processing step S66).

  A Wi-Fi connection is established between the mobile terminal 200 and the digital camera 100 through the above processing steps. Using the received camera usage status, the mobile terminal 200 can start an application in a state in which the current usage status of the digital camera 100 is reflected. In the example of the camera remote control app shown in FIG. 12, the camera remote control app is activated as a function frequently used by the user, for example, in a state in which the effect function type is reflected (display area D5).

  According to the configuration of the third embodiment described above, the camera remote control application can be activated in a form that reflects the current camera usage status. That is, the initial screen of the application of the mobile terminal 200 can be activated while being frequently used by the user of the digital camera 100. In addition, the said process of Example 3 may be performed as a part of above-mentioned process (process step S1-S6) in Example 1. FIG. The features of the third embodiment can be applied to various applications.

[Example 4]
The fourth embodiment is a processing example when the management file information acquired this time is different from the management file information stored in the nonvolatile memory 203 in the processing step S37 in the first embodiment. FIG. 9 is a sequence diagram illustrating communication processing between the mobile terminal 200 and the digital camera 100 according to the fourth embodiment. In FIG. 9, the same reference numerals are given to the processes equivalent to the processing steps in the first embodiment shown in FIG. 6, and the description thereof will be omitted, and the characteristic part of the fourth embodiment will be described below.

  The management file information is stored in the portable terminal 200 through a series of processing steps S1 to S17, and further, the processing steps S31 to S36 are executed by the power-off / on operation of the portable terminal 200, and the management file information is acquired again. A situation (a situation where a Wi-Fi connection is established) is assumed. Here, it is assumed that while the mobile terminal 200 is powered off, shooting and image deletion are performed in the digital camera 100 (processing step S78), and the management file information is updated (processing step S79). The mobile terminal 200 activated again displays a list of images based on the cached thumbnails (processing step S81). Furthermore, the portable terminal 200 compares the management file information acquired this time with the management file information stored in the nonvolatile memory 203 (processing step S82).

  When the management file information acquired this time is different from the management file information stored in the nonvolatile memory 203, the portable terminal 200 executes a series of processing steps S7 to S14 again in order to update the thumbnail. Thereby, the latest thumbnail is acquired, and the latest image list is displayed (processing step S83). In addition, the mobile terminal 200 caches the acquired latest thumbnail and stores the management file information (processing steps S84 and S85). In other words, the thumbnail is replaced with the latest one quickly and reliably.

  According to the configuration of the fourth embodiment described above, in addition to the effects of the first embodiment, the management information file can be updated quickly and reliably to the latest one.

[Example 5]
The fifth embodiment is a processing example when the management file information acquired this time is different from the management file information stored in the nonvolatile memory 203 as in the fourth embodiment. FIG. 10 is a sequence diagram illustrating communication processing between the mobile terminal 200 and the digital camera 100 according to the fifth embodiment. In FIG. 10, the same reference numerals are assigned to the same processes as the process steps in the fourth embodiment shown in FIG. 9, and the description thereof will be omitted, and the characteristic parts of the fifth embodiment will be described below.

  The management file information is stored in the portable terminal 200 through a series of processing steps S1 to S17, and further, the processing steps S31 to S36 are executed by the power-off / on operation of the portable terminal 200, and the management file information is acquired again. A situation (a situation where a Wi-Fi connection is established) is assumed. Here, it is assumed that while the mobile terminal 200 is powered off, shooting and image deletion are performed in the digital camera 100 (processing step S78), and the management information file is updated (processing step S79).

  Since the mobile terminal 200 calculates only the difference between the management file information stored in the non-volatile memory 203 and the management file information acquired this time, the mobile terminal 200 requests only the thumbnails that the mobile terminal 200 does not have, and therefore acquires the thumbnails. A series of processes (processing steps S7 to S14) are executed. Accordingly, since the latest thumbnails are prepared, the mobile terminal 200 displays the latest image list (processing step S83). Furthermore, the mobile terminal 200 caches the latest thumbnail and stores the latest management file information (processing steps S84 and S85).

  According to the configuration of the above-described fifth embodiment, in addition to the effects of the first and fourth embodiments, the management information file can be updated to the latest one with a minimum processing time.

  The above is the description of the embodiment of the present invention. The scope of the present invention is not limited to the above-described embodiment. For example, examples configured by appropriately combining the above-described plurality of examples are also included in the scope of the present invention.

  In the above-described embodiment, the management file information transmitted from the digital camera to the portable terminal has been described as the last update date and time when the image file of the digital camera was last updated. However, the management file information only needs to be information that allows the mobile terminal side to know that the image file of the digital camera has been updated. Therefore, various types of information other than those exemplified in the above-described embodiment can be used. Can be used.

100 Digital camera 101 CPU
102 Operation unit 104 Aperture / shutter drive circuit 106 Shooting lens 108 Aperture 110 Shutter 112 Image sensor 114 Signal processing circuit 116 Image processing engine 118 Buffer memory 126 ROM
127 Nonvolatile memory 124 LCD
131 NFC communication interface 132 Wi-Fi communication interface 200 Portable terminal 201 CPU
202 Main storage device 203 Non-volatile memory 210 Touch panel 211 LCD
221 NFC communication interface 222 Wi-Fi communication interface

Claims (8)

A first communication processing unit that performs communication according to a first communication method;
A second communication processing unit for performing preparation for establishing a connection in the first communication method in a second communication method;
An image file management unit for managing captured image files,
The second communication processing unit performs management information of the image file when exchanging preparations for establishing a connection with the external communication terminal with the first communication method using the second communication method. To the external terminal,
Imaging device. The first communication method is Wi-Fi communication;
The second communication method is NFC (Near Field Communication),
The management information of the image file is information relating to the last update date and time of the image file.
The imaging device according to claim 1. When the second communication processing unit prepares for establishing a connection with the external terminal using the first communication method using the second communication method, the second communication processing unit receives the camera setting information of the imaging device. Send to the external terminal;
The imaging device according to claim 1 or 2. When the second communication processing unit performs preparation for establishing a connection with the external terminal using the first communication method using the second communication method, the camera usage status information of the imaging device To the external terminal,
The imaging device according to any one of claims 1 to 3. A first communication processing unit that performs communication according to a first communication method;
A second communication processing unit for performing preparation for establishing a connection in the first communication method in a second communication method;
An image file management unit for managing captured image files,
The second communication processing unit performs management information of the image file when exchanging preparations for establishing communication with the external terminal using the first communication method using the second communication method. To the external terminal,
An imaging device;
A communication processing unit that exchanges connection preparations with the imaging device using the first communication method using the second communication method, and receives management information of the image file of the imaging device at the time of the exchange. ,
An image cache unit that caches display images of the image list;
In response to receiving the management information of the image file from the imaging device, the validity of the cached image list is determined based on the received management information of the image file, and the cached image list is valid. An image list display control unit configured to display a display image of the cached image list when it is determined that there is an image;
A mobile device,
A communication system comprising: The communication processing unit of the mobile terminal displays the display image of the cached image list even when it is determined that the cached image list is not valid, receives the latest image file, Control to replace the currently displayed image list with the image list of the received image file for display.
The communication system according to claim 5. The communication processing unit of the portable terminal compares the management information of the latest received image file with the management information of the previously received image file to obtain a difference, thereby obtaining only a display image corresponding to the difference from the imaging device. get,
The communication system according to claim 5. An imaging device comprising: a first communication processing unit that performs communication using a first communication method; and a second communication processing unit that performs preparation for establishing a connection using the first communication method using a second communication method A communication control method executed in a communication system including a device and a mobile terminal including a communication processing unit,
In the imaging apparatus, management information of an image file is transmitted to the external terminal when exchanging preparations for establishing communication with the external terminal using the first communication system using the second communication system. Sending, and
Receiving management information of the image file of the imaging device when exchanging preparations for connection by the first communication method with the imaging device in the portable communication terminal using the second communication method;
Caching the display image of the image list in the mobile terminal;
In the portable terminal, in response to receiving the management information of the image file from the imaging device, the validity of the cached image list is determined based on the received management information of the image file, and the cached Displaying a display image of the cached image list when it is determined that the image list is valid,
Communication control method.

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