JP2010114860A - Image transmitting/receiving system, image transmitting/receiving apparatus, and program for the image transmitting/receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image transmitting/receiving system capable of converting resolution of image data using an apparatus in which performance of a converter is improved. <P>SOLUTION: In the case where performance of a first converter in an image transmitting apparatus is high, a first conversion mode is set by user operation and a conversion controller controls to convert the resolution of image data using the first converter. In the case where performance of a second converter in an image transmitting/receiving apparatus is high, a second conversion mode is set by user operation, and the conversion controller controls to convert the resolution of the image data using the second converter. In the case where performance of a third converter in an image receiving apparatus is high, a third conversion mode is set by user operation, and the conversion controller controls to convert the resolution of the image data using the third converter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image transmission / reception apparatus that transmits image data received from an image transmission apparatus to the image reception apparatus.

  Recently, an image transmission / reception system including a DVD player as a source device (image transmission device) compliant with the HDMI standard, an AV amplifier as a repeater device (image transmission / reception device), and a display device as a sink device (image reception device). By using image data and audio data in HDMI data output from a DVD player, both image data and audio data can be transmitted to a display device via an AV amplifier via a single HDMI cable. Can do. The display device converts the received HDMI data into the original image data and displays it.

Each of the DVD player, the AV amplifier, and the display device includes a conversion unit that converts the resolution of image data. For example, when the resolution of image data reproduced by a DVD player is 480p and 1080p image data is displayed on the display device, any one conversion unit of the DVD player, the AV amplifier, and the display device uses the resolution of the image data. May be converted from 480p to 1080p. Here, for example, when the resolution is converted by the DVD player when the AV amplifier and the display device have a high-performance conversion unit and the DVD player has a low-performance conversion unit, the DVD player The image quality of the image data transmitted to the AV amplifier deteriorates, resulting in a problem that the image quality of the image data displayed on the display device deteriorates. Therefore, it is desirable to convert the resolution with an AV amplifier or a display device having a conversion unit with the highest possible performance.
Japanese Patent No. 3861916 Japanese Patent No. 386915

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide an image transmission / reception system capable of converting the resolution of image data with a device having a high performance of a conversion unit. .

  An image transmission / reception system according to a preferred embodiment of the present invention includes: an image transmission device that transmits image data; an image transmission / reception device that receives image data from the image transmission device and transmits the image data to a later-described image reception device; An image receiving device for receiving image data, wherein the image transmitting device includes first converting means for converting the resolution of the image data, and the image transmitting / receiving device converts the resolution of the image data. The image receiving device has a third converting means for converting the resolution of the image data, and the image transmitting / receiving device changes the conversion mode to one of the first to third conversion modes according to a user operation. Mode setting means for setting, resolution determining means for determining resolution, and resolution of image data in the first conversion means when the conversion mode is the first conversion mode. Is converted to the resolution determined by the resolution determination unit, the second conversion unit and the third conversion unit are instructed not to convert the resolution, and the conversion mode is the second conversion mode. In this case, the second conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the third conversion unit are instructed not to convert the resolution. When the conversion mode is the third conversion mode, the third conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the first conversion unit Conversion control means for instructing the two conversion means not to convert the resolution.

  When the performance of the first conversion unit of the image transmission apparatus is high, the first conversion mode is set by a user operation. In this case, since the conversion control unit controls the first conversion unit to convert the resolution of the image data, the first conversion unit having high performance can convert the resolution. When the performance of the second conversion unit of the image transmission / reception apparatus is high, the second conversion mode is set by a user operation. In this case, since the conversion control unit controls the second conversion unit to convert the resolution of the image data, the first conversion unit with high performance can convert the resolution. When the performance of the third conversion unit of the image receiving device is high, the third conversion mode is set by a user operation. In this case, since the conversion control unit controls the third conversion unit to convert the resolution of the image data, the third conversion unit having high performance can convert the resolution.

  Preferably, when the conversion mode is the first conversion mode, the image transmission / reception apparatus determines whether the resolution of the image data received from the image transmission apparatus is the resolution determined by the resolution determination unit. A resolution determination unit configured to perform resolution conversion of the image data to the second conversion unit when the resolution of the image data received from the image transmission device is not the resolution determined by the resolution determination unit. Is further converted to the resolution determined by the resolution determining means.

  In the first conversion mode, when the first conversion unit cannot convert to the resolution determined by the resolution determination unit, the second conversion unit converts the resolution instead, so that the problem that conversion to the determined resolution cannot be performed can be solved.

  The resolution of the image data can be converted by an apparatus having a high conversion unit performance.

  Hereinafter, an image transmission / reception system including a DVD player (image transmission device, source device), an AV amplifier (image transmission / reception device, repeater device) and a display device (image reception device, sink device) according to a preferred embodiment of the present invention will be described. Although specifically described with reference, the present invention is not limited to these embodiments.

  FIG. 1 is a block diagram showing the configuration of the DVD player 10, AV amplifier 20, and display device 30. The DVD player 10, the AV amplifier 20, and the display device 30 comply with the HDMI standard, for example, and are connected to each other via an HDMI cable.

[Configuration of DVD Player 10]
The DVD player 10 includes a reproduction unit 11, a conversion unit 12, an HDMI transmission unit 13, a control unit 14, an operation display unit 15, a memory 16, and a connector unit 17.

  When the DVD disc is inserted, the reproduction unit 11 reads out image data (including the meaning of video data) recorded on the DVD disc, decodes it, and supplies it to the conversion unit 12. Further, the playback unit 11 reads out audio data recorded on the DVD disc, decodes it, and supplies it to the HDMI transmission unit 13. The reproducing unit 11 includes an optical pickup, a servo circuit, an MPEG decoder, etc. (not shown).

  The conversion unit 12 converts the supplied image data into a resolution designated by the control unit 14 and supplies it to the HDMI transmission unit 13. Although details will be described later, the resolution after conversion is instructed from the control unit 23 of the AV amplifier 20 via the CEC line. Further, the conversion unit 12 supplies the supplied image data to the HDMI transmission unit 13 without converting the resolution in accordance with an instruction from the control unit 14.

  The HDMI transmission unit 13 converts the image data supplied from the conversion unit 12 and / or the audio data supplied from the reproduction unit 11 into HDMI standard data (hereinafter referred to as HDMI data) according to an instruction from the control unit 14. Convert. The HDMI transmission unit 13 transmits the HDMI data to the AV amplifier 20 via the connector unit 17.

  The HDMI transmission unit 13 is connected to the AV amplifier 20 via a TMDS line for transmitting / receiving HDMI data (usually there are a plurality of lines, but only one line is shown in FIG. 1 for simplicity) and a hot plug line. Connected to the HDMI receiver 21. The HDMI transmission unit 13 is connected to the HDMI reception unit 21 and the PROM 25 of the AV amplifier 20 via a DDC line for reading out EDID.

  The control unit 14 controls the playback unit 11, the conversion unit 12, the HDMI transmission unit 13, the operation display unit 15, the memory 16 and the like based on the operation program of the DVD player stored in the built-in or connected memory. For example, a microcomputer or a CPU. The control unit 14 executes various processes based on an operation input from the operation display unit 15 or a control signal and data from each unit.

  The control unit 14 is connected to the control unit 23 of the AV amplifier 20 via the CEC line, and transmits / receives commands and / or data to / from the control unit 23. When the control unit 14 receives from the control unit 23 of the AV amplifier 20 an instruction to convert the resolution of the image data to be output by the HDMI transmission unit 13 via the CEC line, the control unit 14 changes the image data to the instructed resolution. The converter 12 is controlled. When the control unit 14 receives an instruction from the control unit 23 of the AV amplifier 20 to not convert the resolution of the image data to be output by the HDMI transmission unit 13 via the CEC line, the control unit 14 does not change the resolution of the image data. The converter 12 is controlled.

[Configuration of AV amplifier]
The AV amplifier 20 includes an HDMI reception unit 21, an HDMI transmission unit 22, a control unit 23, a conversion unit 24, a memory (EDID PROM, hereinafter referred to as PROM) 25, an audio processing unit 26, and a connector unit 27. , 28 and an operation display unit 29.

  The HDMI receiving unit 21 receives the HDMI data transmitted from the DVD player 10, generates original image data (image data before HDMI conversion) from the received HDMI data, and converts the converting unit 24 and / or This is supplied to the HDMI transmission unit 22. Further, the HDMI receiving unit 21 generates original audio data from the received HDMI data and supplies the original audio data to the audio processing unit 26.

  The HDMI receiving unit 21 reads information about the resolution of the image data from the HDMI data and supplies the information to the control unit 23. Information about resolution is described in, for example, AVI Info of HDMI data.

  The converting unit 24 converts the image data supplied from the HDMI receiving unit 21 into a resolution designated by the control unit 23 and supplies the converted image data to the HDMI transmitting unit 22. Alternatively, the conversion unit 24 supplies the image data supplied from the HDMI reception unit 21 to the HDMI transmission unit 22 without converting the resolution in accordance with an instruction from the control unit 23.

  The HDMI transmission unit 22 converts the image data supplied from the conversion unit 24 or the HDMI reception unit 21 and the audio data supplied from the audio processing unit 26 as necessary into HDMI data. The HDMI transmission unit 22 transmits the HDMI data to the display device 30 via the connector unit 28.

  The HDMI transmission unit 22 is connected to the HDMI reception unit 31 of the display device 30 via a TMDS line and a hot plug line. The HDMI transmitting unit 22 is connected to the PROM 34 and the HDMI receiving unit 31 of the display device 30 via a DDC line for reading out EDID.

  The audio processing unit 26 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 21, and supplies the audio signal to the speaker 60 connected to the outside. . Further, the audio processing unit 26 supplies audio data to the HDMI transmission unit 22 as necessary.

  Based on the AV amplifier operation program stored in the built-in or connected memory, the control unit 23 is an HDMI reception unit 21, an HDMI transmission unit 22, a conversion unit 24, a PROM 25, an audio processing unit 26, and an operation display unit 29. For example, a microcomputer or a CPU. The control unit 23 executes various processes based on an operation input from the operation display unit 24 or a control signal and data from each unit.

  The control unit 23 is connected to the control unit 14 of the DVD player 10 via the CEC line, and transmits / receives commands and data to / from the control unit 14. The control unit 23 is connected to the control unit 33 of the display device 30 via the CEC line, and transmits and receives commands and data to and from the control unit 33.

  The control unit 23 sets a conversion mode that indicates which conversion unit converts the resolution of the image data from among the conversion units of the DVD player 10, the AV amplifier 20, and the display device 30 according to the user's selection operation. (To set means to store the conversion mode selected by the user operation in a memory not shown). As shown in FIG. 2, the conversion mode includes a DVD player conversion mode in which resolution is converted by the conversion unit 12 of the DVD player 10, an AV amplifier conversion mode in which resolution is converted by the conversion unit 24 of the AV amplifier 20, and a display device. There are display device conversion modes in which the resolution is converted by 30 conversion units 32. Among these conversion modes, one selection mode is selected by a user operation.

  When the conversion mode is the DVD player conversion mode, the control unit 23 transmits an instruction to convert the resolution to the control unit 14 of the DVD player 10 via the CEC line. When the conversion mode is the AV amplifier conversion mode, the control unit 23 transmits an instruction to convert the resolution to the conversion unit 24 of the AV amplifier 20. When the conversion mode is the display device conversion mode, the control unit 23 transmits an instruction to convert the resolution to the control unit 33 of the display device 30 via the CEC line.

[Configuration of Display Device 30]
The display device 30 includes an HDMI receiving unit 31, a conversion unit 32, a control unit 33, a memory (EDID PROM, hereinafter referred to as PROM) 34, an operation unit 35, an audio processing unit 36, a speaker 37, A display unit 38 and a connector unit 39 are provided.

  The HDMI receiving unit 31 receives the HDMI data transmitted from the HDMI transmitting unit 22 of the AV amplifier 20, generates original image data from the HDMI data, and supplies the original image data to the converting unit 32. In addition, the HDMI receiving unit 31 generates original audio data from the HDMI data and supplies it to the audio processing unit 36.

  The conversion unit 32 converts the resolution of the image data from the HDMI receiving unit 31 in accordance with an instruction from the control unit 33, and supplies the converted image data to the display unit 38. Alternatively, the conversion unit 32 supplies the image data as it is to the display unit 38 without converting the resolution of the image data from the HDMI receiving unit 31 in accordance with an instruction from the control unit 33.

  The display unit 38 is supplied with image data from the conversion unit 32 or the HDMI receiving unit 31 and displays an image based on the image data, and is, for example, an LCD or a CRT.

  The audio processing unit 36 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 31 and supplies the processed audio data to the speaker 37.

  The control unit 33 controls the HDMI reception unit 31, the conversion unit 32, the PROM 34, the audio processing unit 36, the display unit 38, and the like based on an operation program for the display device stored in a built-in or connected memory. For example, a microcomputer or a CPU. The control unit 33 executes various processes based on an operation input from the operation unit 35 or a control signal and data from each unit.

  When an instruction to convert the resolution is supplied from the control unit 23 of the AV amplifier 20 via the CEC line, the control unit 33 controls the conversion unit 32 to convert the image data to the resolution instructed to be converted. On the other hand, when an instruction not to convert the resolution is supplied from the control unit 23 of the AV amplifier 20 via the CEC line, the conversion unit 32 is controlled so as not to convert the resolution of the image data.

[Operation]
FIG. 3 is a flowchart showing processing of the control unit 23 of the AV amplifier 20. FIG. 4 is a table showing resolutions that can be supported by the display device 30, and is stored in the PROM 34. FIG. 5 is a table showing resolutions that the AV amplifier 20 can handle, and is stored in the PROM 25. FIG. 6 is a table showing resolutions that the display device 30 and the AV amplifier 20 can handle in common. FIG. 7 is a table showing resolutions that can be supported by the DVD player 10, and is stored in the memory 16. FIG. 8 is a flowchart showing processing of the control unit 14 of the DVD player 10. FIG. 9 is a flowchart showing processing of the control unit 33 of the display device 30.

  As shown in FIG. 3, the control unit 23 of the AV amplifier 20 is connected to the PROM 34 of the display device 30 via the DDC line, and acquires information of resolution that can be supported by the display device 30 shown in FIG. 4 (S1). . Subsequently, the control unit 23 determines the resolution of the image data to be displayed on the display device 30 (S2). Specifically, the resolution (see FIG. 6) common to the resolution that can be supported by the display device 30 shown in FIG. 4 and the resolution that can be handled by the AV amplifier 20 shown in FIG. 5 is specified. In this case, three resolutions of 480p, 1080i, and 1080p are specified. The control unit 23 determines one resolution from the common resolutions shown in FIG. For example, the common resolution of FIG. 6 may be displayed on the operation display unit 29, and one resolution may be selected by a user operation. The control unit 23 automatically selects the highest resolution (in this case, 1080p). Also good. Here, it is assumed that the control unit 23 determines 1080p.

  Subsequently, the control unit 23 determines the conversion mode (S3, S4). First, the control unit 23 determines whether or not the conversion mode is the DVD player conversion mode (S3). If it is the DVD player conversion mode (YES in S3), the process proceeds to S5. If it is not the DVD player conversion mode (NO in S3), the control unit 23 determines whether or not it is the AV amplifier conversion mode (S4). . If it is the AV amplifier conversion mode (YES in S4), the process proceeds to S8, and if it is not the AV amplifier conversion mode (NO in S4), the display apparatus conversion mode is determined and the process proceeds to S11.

  In the DVD player conversion mode (YES in S3), the control unit 23 transmits an instruction to the control 14 of the DVD player 10 via the CEC line so as to convert the image data to the resolution determined in S2 (S5). . As shown in FIG. 8, the control unit 14 of the DVD player 10 determines whether or not an instruction to convert the resolution is received from the control unit 23 of the AV amplifier 20 via the CEC line (S21). When receiving an instruction to convert the resolution (YES in S21), the control unit 14 controls the conversion unit 12 to convert the resolution to the instructed resolution (S22). In response to this, the converter 12 converts the image data to the designated resolution.

  Returning to FIG. 3, the control unit 23 of the AV amplifier 20 controls each unit of the AV amplifier 20 so as not to convert the resolution (S6). For example, the control unit 23 causes the conversion unit 24 to supply the image data to the HDMI transmission unit 22 without converting the resolution. Alternatively, the control unit 23 causes the HDMI transmission unit 21 to directly supply the image data to the HDMI transmission unit 22 without going through the conversion unit 24.

  In addition, the control unit 23 transmits an instruction not to convert the resolution to the control unit 33 of the display device 30 via the CEC line (S7). As shown in FIG. 9, the control unit 33 of the display device 30 determines whether or not an instruction not to perform resolution conversion is received from the control unit 23 of the AV amplifier 20 via the CEC line (S33). When an instruction not to convert the resolution is received (YES in S33), each part of the display device 30 is controlled so as not to convert the resolution (S34). For example, the control unit 33 causes the conversion unit 32 to supply the display unit 38 without converting the resolution of the image data. Alternatively, the control unit 33 causes the HDMI reception unit 31 to supply image data to the display unit 38 without going through the conversion unit 32.

  As described above, in the DVD player conversion mode, the conversion unit 12 of the DVD player 10 converts the resolution of the image data, and the conversion unit 24 of the AV amplifier 20 and the conversion unit 32 of the display device 30 do not convert the resolution. Accordingly, when the performance of the conversion unit 12 of the DVD player 10 is high, the resolution can be converted by the conversion unit 12 of the high-performance DVD player 10 by selecting the DVD player conversion mode.

  For example, if the resolution determined in S2 is 1080i and the DVD player 10 does not support the determined resolution 1080i as shown in FIG. ) To transmit the image data to the AV amplifier 20. Therefore, in this case, the conversion unit 24 of the AV amplifier 20 converts the resolution of the image data. Since the resolution after conversion is determined from the common resolution of the resolution that can be supported by the AV amplifier 20 and the resolution that the display device 30 can support, the conversion unit 24 of the AV amplifier 20 can always convert to the determined resolution. it can.

  As shown in FIG. 3, the control unit 23 determines whether or not the resolution of the image data received from the DVD player 10 is the resolution determined in S2 (S14). If it is the determined resolution (YES in S14), the conversion unit 12 of the DVD player 14 has been converted to the resolution determined in S2, and thus the process ends. On the other hand, if the resolution is not determined (NO in S14), the conversion unit 12 of the DVD player 14 cannot convert the resolution determined in S2, so the control unit 23 sends the image data to the HDMI receiving unit 21. The image data is supplied to the conversion unit 24, and the conversion unit 23 converts the resolution of the image data to the resolution determined in S2 (S15). Thus, even when the conversion unit 14 of the DVD player 10 cannot convert to the resolution determined in S2, the conversion unit 23 of the AV amplifier 20 can convert the resolution determined in S2 instead.

  Next, in the AV amplifier conversion mode (YES in S4), the control unit 23 sends an instruction not to convert the resolution to the control unit 14 of the DVD player 10 via the CEC line (S8). As shown in FIG. 8, the control unit 14 of the DVD player 10 determines whether or not an instruction not to convert the resolution is received from the control unit 23 of the AV amplifier 20 via the CEC line (S23). When an instruction not to convert the resolution is received (YES in S23), each part of the DVD player 10 is controlled so as not to convert the resolution (S24). For example, the control unit 14 causes the conversion unit 12 to supply image data to the HDMI transmission unit 13 without converting the resolution. Alternatively, the control unit 33 causes the reproduction unit 11 to supply the image data to the HDMI transmission unit 13 without going through the conversion unit 12.

  Returning to FIG. 3, the control unit 23 controls each unit of the AV amplifier 20 to convert the resolution of the image data to the resolution determined in S2 (S9). That is, the control unit 23 causes the HDMI receiving unit 21 to supply the image data to the conversion unit 24, and causes the conversion unit 23 to convert the resolution of the image data to the resolution determined in S2.

  The control unit 23 transmits an instruction not to convert the resolution to the control unit 33 of the display device 30 via the CEC line (S10). As shown in FIG. 9, the control unit 33 of the display device 30 determines whether or not an instruction not to perform resolution conversion is received from the control unit 23 of the AV amplifier 20 via the CEC line (S33). When an instruction not to convert the resolution is received (YES in S33), each part of the display device 30 is controlled so as not to convert the resolution (S34). For example, the control unit 33 causes the conversion unit 32 to supply the display unit 38 without converting the resolution of the image data. Alternatively, the control unit 33 causes the HDMI reception unit 31 to supply image data to the display unit 38 without going through the conversion unit 32.

  As described above, in the AV amplifier conversion mode, the conversion unit 24 of the AV amplifier 20 converts the resolution of the image data, and the conversion unit 12 of the DVD player 10 and the conversion unit 32 of the display device 30 do not convert the resolution. Therefore, when the performance of the conversion unit 24 of the AV amplifier 20 is high, the resolution can be converted by the conversion unit 24 of the high-performance AV amplifier 20 by selecting the AV amplifier conversion mode.

  Next, in the display device conversion mode (NO in S4), the control unit 23 transmits an instruction not to convert the resolution to the control unit 14 of the DVD player 10 via the CEC line (S11). As shown in FIG. 8, the control unit 14 of the DVD player 10 determines whether or not an instruction not to convert the resolution is received from the control unit 23 of the AV amplifier 20 via the CEC line (S23). When an instruction not to convert the resolution is received (YES in S23), each part of the DVD player 10 is controlled so as not to convert the resolution (S24). For example, the control unit 14 causes the conversion unit 12 to supply image data to the HDMI transmission unit 13 without converting the resolution. Alternatively, the control unit 33 causes the reproduction unit 11 to supply the image data to the HDMI transmission unit 13 without going through the conversion unit 12.

  Returning to FIG. 3, the control unit 23 of the AV amplifier 20 controls each unit of the AV amplifier 20 so as not to convert the resolution (S12). For example, the control unit 23 causes the conversion unit 24 to supply the image data to the HDMI transmission unit 22 without converting the resolution. Alternatively, the control unit 23 causes the HDMI transmission unit 21 to directly supply the image data to the HDMI transmission unit 22 without going through the conversion unit 24.

  The control unit 23 transmits an instruction via the CEC line to the control unit 33 of the display device 30 so as to convert the image data to the resolution determined in S2 (S13). As shown in FIG. 9, the control unit 33 of the display device 30 determines whether or not an instruction to convert the resolution is received from the control unit 23 of the AV amplifier 20 via the CEC line (S31). When receiving an instruction to convert the resolution (YES in S31), the control unit 33 causes the HDMI reception unit 31 to supply the image data to the conversion unit 32, and causes the conversion unit 32 to convert the image data to the instructed resolution. (S32). In response to this, the conversion unit 32 converts the image data to the designated resolution.

  As described above, in the display device conversion mode, the conversion unit 32 of the display device 30 converts the resolution of the image data, and the conversion unit 12 of the DVD player 10 and the conversion unit 24 of the AV amplifier 20 do not convert the resolution. Therefore, when the performance of the conversion unit 32 of the display device 30 is high, the resolution can be converted by the conversion unit 32 of the high-performance display device 30 by selecting the display device conversion mode.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. Further, the program may be provided in the form of a program for causing a computer to execute the above operations of the DVD player, AV amplifier, and display device, and a recording medium on which the program is recorded.

  The present invention can be suitably employed in DVD players, AV amplifiers, display devices, and the like.

1 is a block diagram showing a configuration of a DVD player 10, an AV amplifier 20, and a display device 30 according to a preferred embodiment of the present invention. It is a figure explaining conversion mode. 3 is a flowchart showing processing of the AV amplifier 20; FIG. 6 is a diagram illustrating resolutions that can be supported by the display device 30. FIG. 3 is a diagram illustrating resolutions that can be supported by the AV amplifier 20. 4 is a diagram illustrating a common resolution between a resolution that can be handled by the display device 30 and a resolution that can be handled by the AV amplifier 20. FIG. FIG. 3 is a diagram illustrating resolutions that can be handled by the DVD player 10. 4 is a flowchart showing processing of the DVD player 10. 4 is a flowchart showing processing of the display device 30.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 DVD player 11 Playback part 12 Conversion part 13 HDMI transmission part 14 Control part 20 AV amplifier 21 HDMI reception part 22 HDMI transmission part 23 Control part 24 Conversion part 30 Display apparatus 31 HDMI reception part 32 Conversion part 33 Control part

Claims (4)

An image transmission device that transmits image data, an image transmission / reception device that receives image data from the image transmission device and transmits the image data to a later-described image reception device, and an image reception device that receives image data from the image transmission / reception device,
The image transmission device includes first conversion means for converting the resolution of the image data;
The image transmission / reception device has a second conversion means for converting the resolution of the image data,
The image receiving device has a third converting means for converting the resolution of the image data;
The image transmitting / receiving apparatus sets a conversion mode to any one of the first to third conversion modes according to a user operation;
Resolution determining means for determining the resolution;
When the conversion mode is the first conversion mode, the first conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the second conversion unit and the third conversion unit Instruct the conversion means not to convert the resolution,
When the conversion mode is the second conversion mode, the second conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the third conversion unit Instruct the conversion means not to convert the resolution,
When the conversion mode is the third conversion mode, the third conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the second conversion unit An image transmission / reception system further comprising conversion control means for instructing the conversion means not to convert the resolution. Resolution determination for determining whether or not the resolution of the image data received from the image transmission apparatus is the resolution determined by the resolution determination means when the conversion mode is the first conversion mode. Further comprising means,
When the resolution of the image data received from the image transmission device is not the resolution determined by the resolution determination unit, the conversion control unit determines the resolution of the image data to the second conversion unit by the resolution determination unit The image transmission / reception system according to claim 1, further instructing to convert to a resolution. The image transmission / reception apparatus applied to the image transmission / reception system according to claim 1 or 2,
Second conversion means for converting the resolution of the image data;
Mode setting means for setting a conversion mode according to a user operation;
Resolution determining means for determining the resolution;
When the conversion mode is the first conversion mode, the first conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the second conversion unit and the third conversion unit Instruct the conversion means not to convert the resolution,
When the conversion mode is the second conversion mode, the second conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the third conversion unit Instruct the conversion means not to convert the resolution,
When the conversion mode is the third conversion mode, the third conversion unit is instructed to convert the resolution of the image data to the resolution determined by the resolution determination unit, and the first conversion unit and the second conversion unit An image transmission / reception apparatus comprising: conversion control means for instructing the conversion means not to convert the resolution.   An operation program for an image transmission / reception apparatus that causes a computer to execute each unit of the image transmission / reception apparatus according to claim 3.

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