JP2016197846A - Communication device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device, a control method, and a program that can notify a user of the difference of resolution if the resolution of image data, an object transmitted to a sink device is different from the resolution of image data that can be transmitted to the sink device.SOLUTION: A communication device 100 includes: transmission means for transmitting image data recorded in a recording medium to an external apparatus; determination means for determining whether or not the external apparatus is a recording device for recording the image data transmitted by the transmission means; comparison means for comparing the resolution of the image data stored in the recording medium with the resolution of image data the transmission means can transmit and determining whether they are different or not if the external apparatus is the recording device; and notification means for notifying a user of warning if the external apparatus is the recording device and the resolution of the image data recorded in the recording medium is different from the resolution of the image data the transmission means can transmit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication device that communicates with an external device.

  Currently, a communication system compliant with an HDMI (High Definition Multimedia Interface) (registered trademark) standard interface has been proposed. Such a communication system includes a source device that transmits image data and a sink device that displays image data received from the source device.

  It is known that the source device transmits image data suitable for the display capability of the sink device to the sink device based on the device information of the sink device acquired from the sink device (see Patent Document 1).

JP 2008-160653 A

  However, the resolution of image data that can be transmitted according to the HDMI standard may not correspond to the resolution of image data that the source device can record on a recording medium connected to the source device. In this case, the resolution of the image data recorded on the recording medium on the source device side is converted to a resolution that can be transmitted according to the HDMI standard and transmitted to the sink device. When the sink device records the image data transmitted from the source device on the recording medium, the resolution of the image data recorded on the recording medium by the sink device is equal to the resolution of the image data recorded on the recording medium on the source device side. The user cannot easily know whether or not they are the same. Therefore, the user can misunderstand that the resolution of the image data recorded on the recording medium connected to the sink device is the same as the resolution of the image data recorded on the recording medium connected to the source device. There was sex. Therefore, it is inconvenient for the user to manage the image data recorded on the recording medium connected to the sink device.

  Such a problem may occur not only in the HDMI standard interface but also in a communication system compliant with the DisplayPort (registered trademark) standard or the SDI (Serial Digital Interface) standard interface.

  Therefore, an object of the present invention is to notify a user when the resolution of image data to be transmitted to a sink device is different from the resolution of image data that can be transmitted to the sink device.

  The communication device according to the present invention is a transmission unit that transmits image data recorded on a recording medium to an external device, and whether the external device is a recording device that records image data transmitted from the transmission unit. Whether the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the transmission means when the external device is the recording device A comparison means, and the external device is the recording device, and the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the transmission means, a warning is issued. And a notification means for notifying a user.

  According to the present invention, when the resolution of image data to be transmitted to the sink device is different from the resolution of image data that can be transmitted to the sink device, it can be notified to the user.

1 is a diagram illustrating an example of a communication system according to a first embodiment. 1 is a block diagram illustrating an example of a communication device according to a first embodiment. 6 is a table illustrating an example of a command value for recording start / stop in the first embodiment. 6 is a diagram illustrating an example of a transmission format of a recording start / stop command in Embodiment 1. FIG. 6 is a flowchart illustrating an example of transmission processing according to the first exemplary embodiment. 3 is an example of a warning in the first embodiment.

  Hereinafter, Example 1 according to the present invention will be described with reference to the drawings. The present invention is not limited to Example 1 discussed below.

  FIG. 1 is a diagram illustrating an example of a communication system according to the first embodiment. The communication system in FIG. 1 includes a communication device 100, an external device 200, and a cable 300. The communication device 100 and the external device 200 are connected via a cable 300. In the communication system, the communication device 100, the external device 200, and the cable 300 are assumed to conform to a predetermined communication standard. In the first embodiment, the HDMI (High Definition Multimedia Interface) standard will be described as an example of the predetermined communication standard.

  The communication device 100 may be a camera, a video camera, or a personal computer. The communication device 100 may be a mobile phone or a smartphone. The external device 200 may be a television or display that receives a television broadcast, or may be a device having a recorder.

  Next, the communication device 100 will be described. FIG. 2 is a block diagram illustrating an example of the configuration of the communication apparatus 100.

  The cable 300 includes a signal line 301, a signal line 302, a signal line 303, and a signal line 304.

  The signal line 301 is used to output a predetermined voltage from the communication device 100 to the outside. The signal line 302 is used to transmit an HPD (Hot Plug Detect) signal to the communication apparatus 100 from the outside. The signal line 303 is used to output at least one of image data, audio data, and auxiliary data from the communication apparatus 100 to the outside. The signal line 304 is used for outputting control data defined in the CEC (Consumer Electronics Control) protocol of the HDMI standard to the outside and transmitting the control data defined in the CEC protocol to the communication apparatus 100 from the outside. . The control data defined in the CEC protocol is hereinafter referred to as “command”.

  The communication device 100 includes a first communication unit 101, a second communication unit 102, a control unit 103, a memory 104, a power supply unit 105, an imaging unit 106, a recording unit 107, a display unit 108, and an operation unit 109.

  The first communication unit 101 includes a power output unit 101a, an HPD signal input unit 101b, a data transmission unit 101c, and a command transmission / reception unit 101d.

  The first communication unit 101 conforms to a predetermined communication standard. When the communication apparatus 100 and the external device 200 are connected via the cable 300, the first communication unit 101 acquires EDID (Extended display identification data) that is information regarding the external device 200. The EDID is information indicating the function and display capability of the external device 200. The EDID is information indicating the displayable resolution of the external device 200, information indicating the image format corresponding to the external device 200, information indicating the audio format corresponding to the external device 200, and information indicating the color space corresponding to the external device 200. Etc. Further, the EDID includes information indicating a manufacturer name of the external device 200, information indicating a manufacturing date, information indicating a product name, identification information such as an ID, and the like. Hereinafter, EDID is referred to as “device information”.

  The power output unit 101a outputs a predetermined voltage defined by the HDMI standard to the signal line 301.

  The HPD signal input unit 101 b notifies the control unit 103 of an HPD signal transmitted via the signal line 302 while a predetermined voltage is being output to the signal line 301. The control unit 103 determines whether the HPD signal supplied from the HPD signal input unit 101b is H (High) level or L (Low) level. When the HPD signal supplied from the HPD signal input unit 101 b is at the H level, the control unit 103 determines that the communication apparatus 100 and the external device 200 are connected via the cable 300. When the HPD signal supplied from the HPD signal input unit 101b is at the H level, the first communication unit 101 acquires device information from the external device 200 by requesting the device information from the external device 200. When the HPD signal supplied from the HPD signal input unit 101 b is at the L level, the control unit 103 determines that the communication apparatus 100 and the external device 200 are not connected via the cable 300. When the HPD signal supplied from the HPD signal input unit 101b is at L level, the first communication unit 101 requests device information until the HPD signal supplied from the HPD signal input unit 101b becomes H level. Absent.

  The data transmission unit 101 c transmits at least one of image data, audio data, and auxiliary data via the signal line 303. The auxiliary data includes a vendor extension area of HDMI Vendor Specific InfoFrame (hereinafter abbreviated as “HDMI VSIF”). When the external device 200 is a recorder device that can record image data, the communication device 100 transmits auxiliary data to the external device 200 by the data transmission unit 101c, thereby starting recording of image data and image data in the external device 200. Can stop the recording. The start of image data recording and the stop of image data recording can be expressed in 1 byte as shown in FIG. FIG. 4 shows the data structure of VSIF Package Contents. Note that the recorder device may be referred to as a “recording device”.

  The instruction to start and stop the recording of image data is invalidated in the initial state, and can be validated by changing the setting of the communication apparatus 100. When the communication apparatus 100 instructs the external device 200 to start recording image data using auxiliary data, the control unit 103 generates VSIF Package Contents including “0X02” indicating the start of image data recording. Then, the control unit 103 controls the data transmission unit 101c to transmit the generated VSIF Packet Contents as auxiliary data to the external device 200. When the communication apparatus 100 instructs the external device 200 to stop recording image data using auxiliary data, the control unit 103 generates a VSIF Packet Contents including “0X01” indicating the stop of recording of image data. Then, the control unit 103 controls the data transmission unit 101c to transmit the generated VSIF Packet Contents as auxiliary data to the external device 200.

  The command transmission / reception unit 101d transmits / receives commands to / from the external device 200 via the signal line 304 based on the CEC protocol. The command transmitted by the command transmission / reception unit 101d is generated by the control unit 103. Further, the command transmission / reception unit 101d receives a command from the outside via the signal line 304 based on the CEC protocol. When the command transmission / reception unit 101 d receives a command via the signal line 304, the command transmission / reception unit 101 d supplies the received command to the control unit 103. The control unit 103 controls each unit of the communication device 100 based on the command supplied from the command transmission / reception unit 101d.

  The second communication unit 102 transmits at least one of image data, audio data, and attached data to the external display device based on a communication standard different from that of the first communication unit 101.

  The control unit 103 controls the entire communication device 100 according to a computer program stored in the memory 104.

  The memory 104 functions as a work area for the control unit 103. The memory 104 stores information related to the communication apparatus 100 and device information acquired from the external device 200. The work area of the control unit 103 is not limited to the memory 104, and may be an external recording device such as a hard disk device. The memory 104 stores a computer program for controlling the communication device 100.

  The power supply unit 105 supplies necessary power to each unit of the communication apparatus 100 from an AC power supply or a battery (not shown).

  The imaging unit 106 includes a lens, an imaging device, an image processing unit, and the like, and generates image data from the optical image of the subject. When the communication apparatus 100 is in the recording mode, the image data generated by the imaging unit 106 is supplied to the recording unit 107 and recorded on the recording medium 107a by the recording unit 107. When the communication apparatus 100 is in the reproduction mode, the imaging unit 106 does not generate image data.

  When the communication apparatus 100 is in the recording mode, the recording unit 107 records the image data generated by the imaging unit 106 and the audio data acquired from the microphone unit (not shown) on the recording medium 107a. The recording unit 107 records the image data generated by the imaging unit 106 on the recording medium 107a in a predetermined format designated by the user. The predetermined format is, for example, a format defined in DCI (Digital Cinema Initiates). The format defined in DCI includes a format corresponding to 2K and a format corresponding to 4K. The format corresponding to 2K is a format corresponding to a resolution of 2048 × 1080. The format corresponding to 4K is a format corresponding to a resolution of 4096 × 2160.

  Further, when the communication apparatus 100 is in the reproduction mode, the recording unit 107 reproduces arbitrary image data and audio data selected by the user using the operation unit 109 from the recording medium 107a. When the communication apparatus 100 is in the reproduction mode, the recording unit 107 reproduces the image data selected by the user via the operation unit 109 from the recording medium 107a and supplies the image data to the display unit 108. When the communication apparatus 100 is in the recording mode, the recording unit 107 records the image data supplied from the imaging unit 106 on the recording medium 107a.

  Image data reproduced from the recording medium 107 a by the recording unit 107 is supplied from the recording unit 107 to the display unit 108. The audio data reproduced from the recording medium 107a by the recording unit 107 is supplied from the recording unit 107 to a speaker unit (not shown) and output from the speaker unit.

  When the user instructs the communication device 100 to transmit the image data reproduced from the recording medium 107a to the external device 200 using the operation unit 109, the recording unit 107 reproduces the image data reproduced from the recording medium 107a. Is supplied to the data transmission unit 101c. The data transmission unit 101 c transmits the image data reproduced from the recording medium 107 a to the external device 200 via the signal line 303.

  When the user instructs the communication device 100 to transmit the audio data reproduced from the recording medium 107a to the external device 200 using the operation unit 109, the recording unit 107 reproduces the audio data reproduced from the recording medium 107a. Is supplied to the data transmission unit 101c. The data transmission unit 101c transmits the audio data reproduced from the recording medium 107a to the external device 200 via the signal line 303.

  The recording medium 107a is, for example, a memory card or a hard disk device. The recording medium 107 a may be a recording medium built in the communication apparatus 100 or an external recording medium that can be detached from the communication apparatus 100.

  The display unit 108 includes a display device such as a liquid crystal display. When the communication apparatus 100 is in the recording mode, the display unit 108 corresponds to a live view image that is image data generated by the imaging unit 106 or image data generated by the imaging unit 106 and recorded on the recording medium 107a. Display the captured image. When the communication apparatus 100 is in the playback mode, the display unit 108 displays a playback image corresponding to the image data read from the recording medium 107a. The display unit 108 displays an image corresponding to the image data stored in the memory 104 based on control from the control unit 103.

  The operation unit 109 provides a user interface for operating the communication device 100. The control unit 103 controls the communication device 100 in accordance with a user instruction input via the operation unit 109.

  A transmission process performed by the communication apparatus 100 will be described with reference to FIG. The transmission process shown in FIG. 5 is realized by the control unit 103 executing the computer program stored in the memory 104 by the control unit 103. The transmission process is a process in which the communication apparatus 100 transmits image data to the external device 200.

  In step S501, the control unit 103 determines whether the external device 200 and the communication device 100 are connected. For example, the control unit 103 determines whether or not the external device 200 and the communication device 100 are connected depending on whether or not the HPD signal is at the H level. When the HPD signal is at the H level, the control unit 103 determines that the external device 200 and the communication device 100 are connected. When it is determined that the external device 200 and the communication device 100 are connected (Yes in S501), the control unit 103 proceeds to S502. When the HPD signal is at the L level, the control unit 103 determines that the external device 200 and the communication device 100 are not connected. When it is determined that the external device 200 and the communication device 100 are not connected (No in S501), the control unit 103 performs S501 until it is determined that the external device 200 and the communication device 100 are connected. Repeat.

  In step S <b> 502, the control unit 103 determines whether the first communication unit 101 has acquired device information from the external device 200. When the first communication unit 101 acquires device information from the external device 200, the control unit 103 proceeds to S503. When the first communication unit 101 has not acquired device information from the external device 200, the control unit 103 returns to S501.

  In step S503, the control unit 103 determines whether the external device 200 is a recorder device. As an example of a determination method for determining whether or not the external device 200 is a recorder device, a first determination method, a second determination method, a third determination method, a fourth determination method, and a fifth determination method A description will be given below. The control unit 103 may determine whether the external device 200 is a recorder device by one of the first determination method to the fifth determination method. The control unit 103 may determine whether or not the external device 200 is a recorder device by combining a plurality of determination methods from the first determination method to the fifth determination method.

  The first determination method will be described below. The first determination method is that the external device 200 is connected to the recorder by comparing the information indicating the manufacturer name and the product name included in the device information acquired from the external device 200 with a threshold value for determining the recorder device. This is a method for determining whether or not the device. It is assumed that the threshold for determining the recorder device is recorded in the memory 104 in advance. When the information indicating the manufacturer name and the information indicating the product name included in the device information match the threshold value recorded in the memory 104, the control unit 103 determines that the external device 200 is a recorder device ( Yes in S503), the process proceeds to S504. When the information indicating the manufacturer name and the information indicating the product name included in the device information do not match the threshold value recorded in the memory 104, the control unit 103 determines that the external device 200 is not a recorder device (S503). No), the control unit 103 proceeds to S508. When the external device 200 is not a recorder device (No in S503), the control unit 103 determines that the external device 200 is a device that performs display such as a television or a display, and the external device 200 transmits from the data transmission unit 101c. It is determined that the image data to be recorded is not recorded.

  The second determination method will be described below. The second determination method is a method for determining whether or not the external device 200 is a recorder device based on size information indicating the size of an image that can be displayed by the external device 200 included in the device information acquired from the external device 200. is there. The size information includes, for example, information indicating the maximum size in the horizontal direction “Max. Horizontal Image Size” and information indicating the maximum size in the vertical direction “Max. Vertical Image Size”. The control unit 103 compares the size of the image that can be displayed by the external device 200 indicated by the size information with the size of the image that can be displayed by the television. It is assumed that the size of an image that can be displayed on a television is recorded in the memory 104 in advance. When the size of the image that can be displayed by the external device 200 indicated by the size information is smaller than the size of the image that can be displayed by the television, the control unit 103 determines that the external device 200 is a recorder device. (Yes in S503), the process proceeds to S504. When the difference between the size of the image that can be displayed by the external device 200 indicated by the size information and the size of the image that can be displayed by the television is not greater than or equal to a predetermined value, the control unit 103 determines that the external device 200 is not a recorder device. Determine (No in S503). In this case (No in S503), the control unit 103 proceeds to S508.

  The third determination method will be described below. The third determination method is a method of determining whether or not the external device 200 is a recorder device based on whether the recording start / stop instruction from the communication device 100 to the external device 200 is valid or invalid. It is. If the instruction to start / stop recording from the communication device 100 to the external device 200 is validated by the user, the control unit 103 determines that the external device 200 is a recorder device (Yes in S503), and proceeds to S504. . When the recording start / stop instruction to the external device 200 from the communication device 100 is invalidated by the user, the control unit 103 determines that the external device 200 is not a recorder device (No in S503), and proceeds to S508. .

  The fourth determination method will be described below. The fourth determination method is a method for determining whether or not the external device 200 is a recorder device using a logical address (Logical Address) of the external device 200 that is notified by a command based on the CEC protocol. There is a high possibility that the recorder device does not have a function of receiving broadcast radio waves from a television or the like or recording broadcast radio waves. Therefore, the control unit 103 determines that the external device 200 is a recorder device when the external device 200 has a logical address of “Recording Device” but does not have a logical address of “Tuner” (Yes in S503). ), The process proceeds to S504. When the external device 200 has the logical address “Tuner”, the control unit 103 determines that the external device 200 is not a recorder device (No in S503), and proceeds to S508. When the external device 200 does not have the “Recording Device” logical address, the control unit 103 determines that the external device 200 is not a recorder device (No in S503), and proceeds to S508.

  The fifth determination method will be described below. The fifth determination method is a method for determining whether or not the external device 200 is a recorder device using “Vendor Specific Data Block” included in the device information acquired from the external device 200. When information indicating that the external device 200 has a recording function is stored in the “Vendor Specific Data Block”, the control unit 103 determines that the external device 200 is a recorder device (Yes in S503), and the process proceeds to S504. move on. When the information indicating that the external device 200 has the recording function is not stored in the “Vendor Specific Data Block”, the control unit 103 determines that the external device 200 is not a recorder device (No in S503), and proceeds to S508. Transition.

  In step S504, the control unit 103 determines whether the resolution of the image data selected by the user as image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information. To compare. Image data to be transmitted to the external device 200 is selected by the user using the operation unit 109. The resolution of the image data selected by the user is the resolution of the image data when recorded on the recording medium 107 a or the resolution of the image data output from the second communication unit 102. For example, when the image data selected by the user as the image data to be transmitted to the external device 200 has a resolution of 2048 × 1080, the HDMI standard defines a resolution of 1920 × 1080, but the resolution of 2048 × 1080 The resolution is not specified. When the predetermined communication standard is the HDMI standard, the first communication unit 101 can transmit image data having a resolution defined in the HDMI standard, but transmits image data having a resolution not defined in the HDMI standard. Can not do it. Therefore, when transmitting the image data with the resolution of 2048 × 1080 to the external device 200, the control unit 103 converts the image data with the resolution of 2048 × 1080 into the resolution of 1920 × 1080 and then transmits the image data to the external device 200. The data transmission unit 101c is controlled. When the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information (Yes in S504), the control unit 103 performs S505. Proceed to For example, when the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 is 2048 × 1080, the control unit 103 proceeds to S505. When the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 matches the resolution that can be displayed by the external device 200 included in the device information (No in S504), the control unit 103 performs S507. Proceed to For example, when the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 is 1920 × 1080, the control unit 103 proceeds to S507.

  In step S505, the control unit 103 notifies the user that the resolution of the image data selected by the user as image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information. To do. For example, the control unit 103 displays a warning indicating that the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information. The display unit 108 is controlled. A warning indicating that the resolution of image data selected by the user as image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information is generated by the control unit 103. FIG. 6 shows an example of a warning displayed on the display unit 108 in S505. In the case where an external display device is connected to the second communication unit 102, the control unit 103 includes at least one of the display unit 108 and the external display device connected to the second communication unit 102 as shown in FIG. A warning may be displayed. After the process of S505 is performed, the control unit 103 proceeds to S506 after the process of S505. In S505, the warning displayed on at least one of the external display devices connected to the display unit 108 and the second communication unit 102 may be other than the warning shown in FIG.

  In step S506, the control unit 103 converts the resolution of the image data selected by the user as image data to be transmitted to the external device 200 to a resolution that can be displayed by the external device 200 included in the device information, and converts the converted image data. The data is supplied to the data transmission unit 101c. Thereafter, the data transmission unit 101 c transmits the image data supplied from the control unit 103 to the external device 200. After the process of S506 is performed, the control unit 103 ends the transmission process illustrated in FIG. In step S506, the control unit 103 may control the data transmission unit 101c to further transmit auxiliary data indicating the resolution of image data to be transmitted to the external device 200 to the external device 200.

  In step S <b> 507, the control unit 103 controls the data transmission unit 101 c to transmit image data selected by the user as image data to be transmitted to the external device 200 to the external device 200. In S507, the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 matches the resolution that can be displayed by the external device 200 included in the device information. For this reason, the control unit 103 does not need to change the resolution of the image data selected by the user as the image data to be transmitted to the external device 200. After the process of S507 is performed, the control unit 103 ends the transmission process illustrated in FIG.

  In step S <b> 508, the control unit 103 controls the data transmission unit 101 c to transmit image data selected by the user as image data to be transmitted to the external device 200 to the external device 200. In S508, the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 may match the resolution that can be displayed by the external device 200 included in the device information. In this case, the control unit 103 does not need to change the resolution of the image data selected by the user as the image data to be transmitted to the external device 200. After the process of S508 is performed, the control unit 103 ends the transmission process illustrated in FIG.

  In S508, the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 may not match the resolution that can be displayed by the external device 200 included in the device information. In this case, the control unit 103 converts the resolution of the image data selected by the user as image data to be transmitted to the external device 200 to a resolution that can be displayed by the external device 200 included in the device information, and converts the converted image data. The data is supplied to the data transmission unit 101c. Thereafter, the data transmission unit 101 c transmits the image data supplied from the control unit 103 to the external device 200. After the process of S508 is performed, the control unit 103 ends the transmission process illustrated in FIG.

  In the first embodiment, the HDMI standard is described as an example of the predetermined communication standard. However, the predetermined communication standard is not limited to the HDMI standard. For example, the predetermined communication standard may be any one of the SDI standard, the DisplayPort standard, and the DVI standard. Further, the predetermined communication standard may be a wireless communication standard or any one of a wireless LAN standard, a WHDI standard, and a Wireless HD standard.

  The communication apparatus 100 according to the first embodiment, when the resolution of the image data selected by the user as the image data to be transmitted to the external device 200 is different from the resolution that can be displayed by the external device 200 included in the device information, Added a warning to that effect to the user. When an external display device is connected to the communication device 100, this warning may allow the user to check the resolution of image data transmitted from the communication device 100 to the external device 200 on the external display device. Generally, the external display device can display the image data selected by the user as image data to be transmitted to the external device 200 without changing the resolution of the image data. For this reason, the resolution of the image data displayed by the external display device is different from the resolution of the image data transmitted to the external device 200. Therefore, in S505, it is preferable to warn the user with at least one of the display unit 108 and the external display device connected to the communication device 100.

  The communication device 100 according to the first embodiment issues a warning as illustrated in FIG. 6 when the external device 200 is a recorder device and the resolution of image data to be transmitted to the external device 200 needs to be converted. I made it. Thereby, even if the external device 200 records the image data received from the communication device 100, the resolution of the image data recorded in the communication device 100 and the resolution of the image data recorded by the external device 200 are the same. It is possible to prevent the user from misunderstanding.

  In S503, the control unit 103 determines whether or not the external device 200 is a recorder device by at least one of the first determination method to the fifth determination method. However, it is not limited to this.

  In the first embodiment, the control unit 103 is configured not to perform the process of S504 before the process of S508 is performed. This is because the external device 200 is not a recorder device (No in S503), and the external device 200 can display the image data received from the data transmission unit 101c without recording the image data received from the data transmission unit 101c. It is because the nature is high. In such a case, even if the resolution of the image data recorded on the recording medium 107a is different from the resolution of the image data transmitted to the external device 200 by the data transmission unit 101c, the user may be misled. Is low. For this reason, in the first embodiment, the control unit 103 does not perform the process of S504 before the process of S508.

(Other examples)
The communication device 100 according to the present invention is not limited to the communication device 100 described in the first embodiment. For example, the communication device 100 according to the present invention can be realized by a system including a plurality of devices.

  The various processes and functions described in the first embodiment can also be realized by a computer program. In this case, the computer program according to the present invention can be executed by a computer (including a CPU and the like), and implements various functions described in this embodiment.

  It goes without saying that the computer program according to the present invention may realize various processes and functions described in this embodiment by using an OS (Operating System) running on the computer.

  The computer program according to the present invention is read from a computer-readable recording medium and executed by the computer. As the computer-readable recording medium, a hard disk device, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, or the like can be used. The computer program according to the present invention may be provided from an external device to a computer via a communication interface and executed by the computer.

Claims (9)

Transmitting means for transmitting image data recorded on a recording medium to an external device;
Determining means for determining whether or not the external device is a recording device for recording image data transmitted from the transmitting means;
When the external device is the recording device, a comparison unit that compares whether the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the transmission unit;
Notification means for notifying a user of a warning when the external device is the recording apparatus and the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the transmission means; A communication apparatus comprising:   The communication apparatus according to claim 1, wherein the transmission unit conforms to an HDMI standard.   The communication device according to claim 1, wherein the determination unit determines whether the external device is the recording device using an EDID received from the external device.   4. The determination unit according to claim 1, wherein the determination unit determines whether or not the external device is the recording device using a logical address included in a command notified from the external device. The communication apparatus as described in.   5. The determination unit according to claim 1, wherein the determination unit determines whether or not the external device is the recording device based on whether or not a recording instruction to the external device is valid. Item 1. The communication device according to item 1.   6. The notification unit displays a warning indicating that the resolution of image data recorded on the recording medium is different from the resolution of image data that can be transmitted by the transmission unit. The communication device according to any one of the above.   The notification means causes an external display device to display a warning indicating that the resolution of image data recorded on the recording medium is different from the resolution of image data that can be transmitted by the transmission means. Item 7. The communication device according to any one of Items 1 to 6. A control method for controlling a communication device, comprising:
Transmitting image data recorded on a recording medium to an external device;
Determining whether the external device is a recording device that records image data transmitted from the communication device; and
When the external device is the recording device, comparing whether the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the communication device;
A step of notifying a user of a warning when the external device is the recording device and the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the communication device; A control method comprising: Transmitting image data recorded on a recording medium to an external device;
Determining whether the external device is a recording device for recording image data transmitted from a communication device;
When the external device is the recording device, comparing whether the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the communication device;
A step of notifying a user of a warning when the external device is the recording device and the resolution of the image data recorded on the recording medium is different from the resolution of the image data that can be transmitted by the communication device; A program that causes a computer to execute.

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