JP2009177331A - Image signal transfer system, method, and imaging device with the transfer system - Google Patents

Image signal transfer system, method, and imaging device with the transfer system Download PDF

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JP2009177331A
JP2009177331A JP2008011737A JP2008011737A JP2009177331A JP 2009177331 A JP2009177331 A JP 2009177331A JP 2008011737 A JP2008011737 A JP 2008011737A JP 2008011737 A JP2008011737 A JP 2008011737A JP 2009177331 A JP2009177331 A JP 2009177331A
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Tetsuya Okano
哲也 岡野
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NEC Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To make a signal line unnecessary, which is used only for a setting command by transferring the setting command using a signal line for data transferring which is not used in a blank (fly-back line) period, and simultaneously make setting change synchronized with the image signal transfer, and a transfer function with high transfer efficiency possible. <P>SOLUTION: An image signal transfer system includes: a signal transmission line; an image transmission circuit which periodically creates an image signal during a synchronous signal and an image period for preparing the image period and a fry-back line period, and outputs it to a receiving side through the signal transmission line; and an image receiving circuit which receives the image signal and the synchronous signal, and outputs the setting command which prepares the image transmission circuit according to the synchronous signal to the image transmission circuit according to the synchronous signal to the image transmission circuit during the fry-back line period. The image transmission circuit and the image receiving circuit respectively have switching means connected each other through the signal transmission line, the image transmission circuit outputs the image signal according to the synchronous signal to the image receiving circuit during the image period, and the setting command is switched to output from the image receiving circuit to the image transmission circuit during the fry-back line period. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は携帯電話、デジタルカメラ、ビデオレコーダ等の撮影手段および表示手段を具備した撮像装置及び、これらの装置における画像信号転送システムまたは方法に関する。   The present invention relates to an image pickup apparatus provided with photographing means and display means such as a mobile phone, a digital camera, and a video recorder, and an image signal transfer system or method in these apparatuses.

従来の撮像装置は画像データ転送用の8ビットバスおよび水平、垂直同期信号等の制御信号転送用のインターフェースと、設定コマンド転送用のシリアルインターフェースを使用している。   The conventional imaging apparatus uses an 8-bit bus for transferring image data, an interface for transferring control signals such as horizontal and vertical synchronizing signals, and a serial interface for transferring setting commands.

なお、本発明に関連する技術は、例えば、特許文献１に記載されている。
特公平７−３６５９２号公報 In addition, the technique relevant to this invention is described in patent document 1, for example.
Japanese Patent Publication No. 7-36592

従来の撮像装置は、コマンド設定のため信号線数が少なく、データ転送と非同期の独立した回路構成のシリアルインターフェースを使用している。そのため、データ転送とは別の設定コマンド用の信号線を必要とし、データ転送と同期した設定変更が行えず、設定変更が有効となるタイミングが不明なため、数フレーム分多めに有効データの待ち時間が必要であった。   The conventional imaging apparatus uses a serial interface having an independent circuit configuration asynchronous with data transfer and having a small number of signal lines for command setting. For this reason, a signal line for a setting command different from the data transfer is required, the setting change synchronized with the data transfer cannot be performed, and the timing at which the setting change becomes effective is unknown. I needed time.

本発明によれば、従来使用していないデータ転送用の信号線をブランク(帰線)期間に利用して設定コマンドを転送することにより、設定コマンド用の信号線を不要とし、同時にデータ転送に同期した設定変更を可能とすることにより転送効率の高い画像信号転送機能を実現できる。   According to the present invention, a setting command is transferred by using a signal line for data transfer that has not been used in the past in a blank (returning) period, so that the signal line for setting command is not required and data transfer is simultaneously performed. By enabling synchronous setting changes, an image signal transfer function with high transfer efficiency can be realized.

本発明の第１の観点において、画像信号転送システムは信号伝送路と、
周期的に画像期間と帰線期間を画定する同期信号及び該画像期間中に画像信号を生成し、該信号伝送路を介して受信側に出力する画像送信回路と、前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像送信回路を設定するための設定コマンドを前記帰線期間中に前記画像送信回路に出力する画像受信回路を具備することを特徴とする。 In a first aspect of the present invention, an image signal transfer system includes a signal transmission path,
A synchronization signal that periodically defines an image period and a blanking period, an image transmission circuit that generates an image signal during the image period, and outputs the image signal to the reception side via the signal transmission path, the image signal, and the synchronization signal And an image receiving circuit for outputting a setting command for setting the image transmitting circuit according to the synchronization signal to the image transmitting circuit during the blanking period.

本発明の第２の観点において、画像転送方法は。送信側において、周期的に画像期間と帰線期間を画定する同期信号と該画像期間中に画像信号を生成し信号伝送路を経由して受信側に出力する処理と、前記受信側において、前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像信号を設定するための設定コマンドを生成し、前記帰線期間中に前記信号伝送路を経由して前記送信側に出力する処理からなることを特徴とする。   In the second aspect of the present invention, an image transfer method is provided. On the transmission side, a synchronization signal that periodically defines an image period and a blanking period, a process of generating an image signal during the image period and outputting it to the reception side via a signal transmission path, and on the reception side, Processing for inputting an image signal and the synchronization signal, generating a setting command for setting the image signal according to the synchronization signal, and outputting the setting command to the transmitting side via the signal transmission path during the retrace period It is characterized by comprising.

本発明の第３の観点において、撮像装置は信号伝送路と、周期的に画像期間と帰線期間を画定する同期信号及び該画像期間中に画像信号を生成し、該信号伝送路を介して受信側に出力する画像送信回路と、前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像送信回路を設定するための設定コマンドを前記帰線期間中に前記画像送信回路に出力する画像受信回路と、前記画像信号を表示する画像表示手段を具備することを特徴とする。   In a third aspect of the present invention, an imaging apparatus generates a signal transmission path, a synchronization signal that periodically defines an image period and a blanking period, and an image signal during the image period, and passes through the signal transmission path. An image transmission circuit to be output to the reception side, the image signal and the synchronization signal are input, and a setting command for setting the image transmission circuit according to the synchronization signal is output to the image transmission circuit during the blanking period And an image display means for displaying the image signal.

図１は本発明の画像信号転送機能を有する撮像装置（カメラモジュール）を示す。同撮像装置はカメラ１０、画像処理回路（ＩＣチップ）１１、ＣＰＵ１２及び表示手段１３から構成される。画像処理回路１１はカメラＩ／Ｆ（インターフェース）２０と表示Ｉ／Ｆ２１を有する。カメラＩ／Ｆ２０はＣＰＵ１２により制御されカメラ１０から画像データをデータバス１４を介し入力し、更に、水平同期信号（ＨＳＹＮＣ），垂直同期信号（ＶＳＹＮＣ）及び転送クロックパルス（ＰＣＬＫ）をカメラ１０から入力する。ＣＰＵ１２は後述する設定コマンドを含む制御信号をカメラＩＦ２０に、その他の制御信号を表示ＩＦ２１に供給する。表示ＩＦ２１はＣＰＵ１２から供給された制御信号に基づきカメラＩＦ２０からの画像表示データを表示手段１３に表示する。   FIG. 1 shows an image pickup apparatus (camera module) having an image signal transfer function of the present invention. The imaging apparatus includes a camera 10, an image processing circuit (IC chip) 11, a CPU 12, and display means 13. The image processing circuit 11 has a camera I / F (interface) 20 and a display I / F 21. The camera I / F 20 is controlled by the CPU 12 and inputs image data from the camera 10 via the data bus 14, and further receives a horizontal synchronization signal (HSYNC), a vertical synchronization signal (VSYNC), and a transfer clock pulse (PCLK) from the camera 10. To do. The CPU 12 supplies a control signal including a setting command described later to the camera IF 20 and other control signals to the display IF 21. The display IF 21 displays the image display data from the camera IF 20 on the display unit 13 based on the control signal supplied from the CPU 12.

図２は本発明の一実施例としてカメラ１０とカメラＩ／Ｆ２０から構成され、前者がデータ送信側、後者がデータ受信側として機能するデータ転送回路を示す。   FIG. 2 shows a data transfer circuit comprising a camera 10 and a camera I / F 20 as an embodiment of the present invention, wherein the former functions as a data transmission side and the latter functions as a data reception side.

送信側のカメラ１０はカメラＩ／Ｆ２０からの設定コマンドを受信しそれに応じて設定を変更する設定制御部３０と画像データを生成し送信するデータ処理部３１と上記設定コマンドの受信と画像データの送信の切り替えを行う切替スイッチ３２から構成される。   The transmission-side camera 10 receives a setting command from the camera I / F 20 and changes the setting accordingly, a data processing unit 31 that generates and transmits image data, and reception of the setting command and image data. It is comprised from the changeover switch 32 which switches transmission.

受信側のカメラＩＦ２０はＣＰＵ１２からの制御信号から設定コマンド信号とイネーブル信号（ＥＮ）を生成するＣＰＵインターフェース４０とカメラ１０から転送されてくる画像データを受信するデータ受信部４１と上記設定コマンドの送信と画像データの受信の切り替えを行う切替スイッチ４２から構成される。   The camera IF 20 on the receiving side generates a setting command signal and an enable signal (EN) from a control signal from the CPU 12, a data receiving unit 41 that receives image data transferred from the camera 10, and transmission of the setting command. And a changeover switch 42 for switching the reception of image data.

切替スイッチ３２と４２はデータバス１４と制御ライン１５により相互接続され、後述のごとく、データ処理部３１から出力される垂直同期信号（ＶＳＹＮＣ）がハイレベルの期間は画像データと水平同期信号（ＨＳＹＮＣ）が、ローレベルの期間は設定コマンドとイネーブル信号（ＥＮ）が有効となるように切替動作を行う。なお、データ処理部３１が出力するデータ転送クロック（ＰＣＬＫ）は常時動作するクロックであるため、設定コマンドの転送用クロックとしても使用する。また、画像データ転送が停止されている期間は垂直同期信号（ＶＳＹＮＣ）がローレベルとなり初期設定等のコマンド転送が自由におこなわれる。ＶＳＹＮＣとＰＬＣＫはスイッチ３２、４２を経由せず、直接データ処理部３１からデータ受信部４１に供給される。   The changeover switches 32 and 42 are interconnected by the data bus 14 and the control line 15, and as will be described later, the image data and the horizontal synchronization signal (HSYNC) are output when the vertical synchronization signal (VSYNC) output from the data processing unit 31 is at a high level. However, during the low level period, the switching operation is performed so that the setting command and the enable signal (EN) are valid. Note that the data transfer clock (PCLK) output from the data processing unit 31 is a clock that always operates, and is also used as a transfer clock for setting commands. Further, during the period when the image data transfer is stopped, the vertical synchronization signal (VSYNC) is at a low level, and command transfer such as initial setting is freely performed. VSYNC and PLCK are supplied directly from the data processing unit 31 to the data receiving unit 41 without passing through the switches 32 and 42.

図３は図２のデータ転送回路に必要な諸信号の波形図を示す。１フレーム周期で垂直同期信号ＶＳＹＮＣがローレベルからハイレベルに切り替わると、データ転送回路の動作モードは画像データ転送期間に入り、送信側のスイッチ３２はデータ処理部３１からの画像データとＨＳＹＮＣをそれぞれデータバス１４と制御ライン１５に供給するよう切り替えられ、受信側のスイッチ４２はデータバス１４と制御ライン１５から供給される画像データとＨＳＹＮＣをデータ受信部４１に供給するよう切り替えられる。この画像データ転送期間中第１ラインデータから最終ラインデータまでの画像データは転送クロックパルスＰＣＬＫに同期し、データバス１４を介してカメラ１０からカメラＩＦ２０に転送され、表示Ｉ／Ｆ２１によって表示データに加工され表示デバイス１３に出力される。画像データ転送期間中、ライン毎に水平同期信号ＨＳＹＮＣがローレベルになるとラインの更新が行われる。この水平同期信号がローレベルの期間はカメラの走査線が該当するラインのスタート位置に戻る期間であり、画像データビットの転送は中断される。   FIG. 3 shows waveforms of various signals necessary for the data transfer circuit of FIG. When the vertical synchronization signal VSYNC is switched from low level to high level in one frame period, the operation mode of the data transfer circuit enters the image data transfer period, and the transmission side switch 32 switches the image data and HSYNC from the data processing unit 31 respectively. The switch 42 is switched to supply the data bus 14 and the control line 15, and the switch 42 on the receiving side is switched to supply the image data and HSYNC supplied from the data bus 14 and the control line 15 to the data receiver 41. During this image data transfer period, the image data from the first line data to the last line data is synchronized with the transfer clock pulse PCLK, transferred from the camera 10 to the camera IF 20 via the data bus 14, and converted into display data by the display I / F 21. Processed and output to the display device 13. During the image data transfer period, the line is updated when the horizontal synchronization signal HSYNC is at a low level for each line. When the horizontal synchronizing signal is at a low level, the scanning line of the camera returns to the start position of the corresponding line, and the transfer of the image data bits is interrupted.

１フレーム周期で垂直同期信号ＶＳＹＮＣがハイレベルからローレベルになるとフレームの更新が行われる。垂直同期信号がローレベルの期間はカメラの走査線はフレームのスタート位置に戻る垂直ブランク期間であり、画像データの転送は中断され、データ転送回路の動作モードは設定コマンド転送期間に入る。受信側のスイッチ４２はＣＰＵＩ／Ｆ４０からのイネーブル信号と設定コマンドをそれぞれ制御ライン１５とデータバス１４に供給するよう切り替えられ、送信側のスイッチ３２はこれらのイネーブル信号と設定コマンドを設定制御部３０に供給するよう切り替えられる。このコマンド転送期間中、設定コマンドは分割され、分割された各コマンドデータはイネーブル信号がローレベルの間に発生する転送クロックパルスＰＣＬＫに同期し、順次データバス１４を介してカメラＩ／Ｆ２０からカメラ１０に転送される。   When the vertical synchronization signal VSYNC changes from the high level to the low level in one frame period, the frame is updated. When the vertical synchronizing signal is at a low level, the scanning line of the camera returns to the frame start position. This is a vertical blanking period, the image data transfer is interrupted, and the operation mode of the data transfer circuit enters the setting command transfer period. The switch 42 on the receiving side is switched to supply the enable signal and setting command from the CPU I / F 40 to the control line 15 and the data bus 14, respectively, and the switch 32 on the transmitting side supplies these enable signal and setting command to the setting control unit 30. Is switched to supply. During this command transfer period, the setting command is divided, and each divided command data is synchronized with the transfer clock pulse PCLK generated while the enable signal is at the low level, and sequentially from the camera I / F 20 to the camera via the data bus 14. 10 is transferred.

垂直ブランク期間中に従来使用していなかったデータ転送用バスを設定コマンドの転送のために使用し、かつ、画像データと設定コマンドが同一の転送クロックパルスを共用することにより、信号数を削減し、簡単な回路構成でかつ高速な設定コマンドの転送を実現することができる。さらに、設定操作が垂直ブランク期間中に行われるので、有効データの待ち時間が短縮し、転送効率を高くすることができる。   The number of signals can be reduced by using the data transfer bus that was not used during the vertical blank period for the transfer of setting commands, and the image data and setting commands share the same transfer clock pulse. It is possible to realize high-speed setting command transfer with a simple circuit configuration. Furthermore, since the setting operation is performed during the vertical blank period, the effective data waiting time can be shortened and the transfer efficiency can be increased.

更に、本発明では設定コマンドの転送が垂直ブランク期間中しか行えないため、図２に示すごとく、ＣＰＵＩ／Ｆ４０内にバッファメモリ４３を内蔵させ、垂直ブランク期間以外の時間にＣＰＵ１２から送られた設定コマンドをこのバッファに蓄積し、設定コマンド転送期間にまとめてカメラ１０に転送させることによりＣＰＵ１２に設定コマンド転送期間の通知が不要となる。   Further, in the present invention, since the setting command can be transferred only during the vertical blank period, as shown in FIG. 2, the buffer memory 43 is built in the CPU I / F 40, and the setting sent from the CPU 12 at a time other than the vertical blank period. By storing the commands in this buffer and transferring them to the camera 10 in a set command transfer period, the CPU 12 need not notify the set command transfer period.

本発明のデータ転送機能を有する撮像装置のブロック図。1 is a block diagram of an imaging apparatus having a data transfer function of the present invention. 本発明のデータ転送機能の詳細を示すブロック図。The block diagram which shows the detail of the data transfer function of this invention. 本発明のデータ転送に関係する諸信号の波形図。FIG. 6 is a waveform diagram of various signals related to data transfer according to the present invention.

符号の説明Explanation of symbols

１０、 カメラ
１１、 画像処理回路
１２、 ＣＰＵ
１３、 表示手段
１４、 データバス
１５、 制御ライン
２０、 カメラＩ／Ｆ
２１， 表示Ｉ／Ｆ
３０、 設定制御部
３１、 データ処理部
３２、 切替スイッチ
４０、 ＣＰＵＩ／Ｆ
４１、 データ受信部
４２、 切替スイッチ 10, camera 11, image processing circuit 12, CPU
13, display means 14, data bus 15, control line 20, camera I / F
21, Display I / F
30, setting control unit 31, data processing unit 32, changeover switch 40, CPU I / F
41, data receiver 42, changeover switch

Claims (14)

信号伝送路と、
周期的に画像期間と帰線期間を画定する同期信号及び該画像期間中に画像信号を生成し、該信号伝送路を介して受信側に出力する画像送信回路と、
前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像送信回路を設定するための設定コマンドを前記帰線期間中に前記画像送信回路に出力する画像受信回路を具備することを特徴とする画像信号転送システム。 A signal transmission line;
A synchronization signal that periodically defines an image period and a blanking period, and an image transmission circuit that generates an image signal during the image period and outputs the image signal to the reception side via the signal transmission path;
An image receiving circuit that inputs the image signal and the synchronization signal and outputs a setting command for setting the image transmission circuit according to the synchronization signal to the image transmission circuit during the retrace period is provided. Image signal transfer system. 請求項１において、前記画像送信回路と前記画像受信回路はそれぞれ切替手段を有し、該切替手段は前記信号伝送路を経由して相互に接続され、前記同期信号に応じ前記画像信号を前記画像期間中に前記画像送信回路から前記画像受信回路に出力し、前記設定コマンドを前記帰線期間中に前記画像受信回路から前記画像送信回路に出力するよう切替動作を実行することを特徴とする画像信号転送システム。   2. The image transmission circuit and the image reception circuit according to claim 1, wherein each of the image transmission circuit and the image reception circuit includes a switching unit, and the switching unit is connected to each other via the signal transmission path, and the image signal is converted into the image according to the synchronization signal. A switching operation is executed so that the image transmission circuit outputs the setting command to the image reception circuit during the period, and the setting command is output from the image reception circuit to the image transmission circuit during the blanking period. Signal transfer system. 請求項１または２において、前記同期信号は垂直同期信号であり、前記帰線期間は垂直帰線期間であることを特徴とする画像信号転送システム。   3. The image signal transfer system according to claim 1, wherein the synchronization signal is a vertical synchronization signal, and the blanking period is a vertical blanking period. 請求項１乃至３のいずれかにおいて、前記画像受信回路は前記垂直帰線期間中イネーブル信号を一定周期で生成し、各イネーブル信号に同期して前記設定コマンドに含まれる制御データを出力することを特徴とする画像信号転送システム。   4. The image receiving circuit according to claim 1, wherein the image receiving circuit generates an enable signal at a constant period during the vertical blanking period and outputs control data included in the setting command in synchronization with each enable signal. A featured image signal transfer system. 請求項１乃至４のいずれかにおいて、前記画像受信回路は外部から供給される設定コマンドを蓄積し前記帰線期間中に前記画像送信回路に出力するバッファメモリを具備することを特徴とする画像信号転送システム。   5. The image signal according to claim 1, wherein the image receiving circuit includes a buffer memory for storing a setting command supplied from the outside and outputting the setting command to the image transmitting circuit during the blanking period. Transfer system. 送信側において、周期的に画像期間と帰線期間を画定する同期信号と該画像期間中に画像信号を生成し信号伝送路を経由して受信側に出力する処理と、
前記受信側において、前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像信号を設定するための設定コマンドを生成し、前記帰線期間中に前記信号伝送路を経由して前記送信側に出力する処理からなることを特徴とする画像信号転送方法。 On the transmission side, a synchronization signal that periodically defines an image period and a blanking period, and a process of generating an image signal during the image period and outputting it to the reception side via a signal transmission path;
On the receiving side, the image signal and the synchronization signal are input, a setting command for setting the image signal according to the synchronization signal is generated, and the signal transmission path is used for the setting signal for setting the image signal. An image signal transfer method comprising a process of outputting to a transmission side. 請求項６において、前記同期信号は垂直同期信号であり、前記帰線期間は垂直帰線期間であることを特徴とする画像信号転送方法。   7. The image signal transfer method according to claim 6, wherein the synchronization signal is a vertical synchronization signal, and the blanking period is a vertical blanking period. 請求項６または７において、前記送信側に出力する処理は前記垂直帰線期間中イネーブル信号を一定周期で生成し各イネーブル信号に同期して前記設定コマンドに含まれる制御データを出力することを特徴とする画像信号転送方法。   8. The process according to claim 6, wherein the processing to be output to the transmission side generates an enable signal at a constant period during the vertical blanking period and outputs control data included in the setting command in synchronization with each enable signal. An image signal transfer method. 請求項６乃至８のいずれかにおいて、前記送信側に出力する処理は外部から供給される設定コマンドを蓄積し前記帰線期間中に前記送信側に出力することを特徴とする画像信号転送方法。   9. The image signal transfer method according to claim 6, wherein the processing to be output to the transmitting side accumulates a setting command supplied from the outside and outputs the setting command to the transmitting side during the blanking period. 信号伝送路と、
周期的に画像期間と帰線期間を画定する同期信号及び該画像期間中に画像信号を生成し、該信号伝送路を介して受信側に出力する画像送信回路と、
前記画像信号と前記同期信号を入力し、前記同期信号に応じ前記画像送信回路を設定するための設定コマンドを前記帰線期間中に前記画像送信回路に出力する画像受信回路と、
前記画像信号を表示する画像表示手段を具備することを特徴とする撮像装置。 A signal transmission line;
A synchronization signal that periodically defines an image period and a blanking period, and an image transmission circuit that generates an image signal during the image period and outputs the image signal to the reception side via the signal transmission path;
An image receiving circuit that inputs the image signal and the synchronization signal, and outputs a setting command for setting the image transmission circuit according to the synchronization signal to the image transmission circuit during the retrace period;
An image pickup apparatus comprising image display means for displaying the image signal. 請求項１０において、前記画像送信回路と前記画像受信回路はそれぞれ切替手段を有し、該切替手段は前記信号伝送路を経由して相互に接続され、前記同期信号に応じ前記画像信号を前記画像期間中に前記画像送信回路から前記画像受信回路に出力し、前記設定コマンドを前記帰線期間中に前記画像受信回路から前記画像送信回路に出力するよう切替動作を実行することを特徴とする撮像装置。   11. The image transmission circuit and the image reception circuit according to claim 10, wherein each of the image transmission circuit and the image reception circuit includes a switching unit, and the switching unit is connected to each other via the signal transmission path, and the image signal is converted into the image according to the synchronization signal. The switching operation is executed so that the image transmission circuit outputs the setting command to the image reception circuit during the period, and the setting command is output from the image reception circuit to the image transmission circuit during the blanking period. apparatus. 請求項１０または１１において、前記同期信号は垂直同期信号であり、前記帰線期間は垂直帰線期間であることを特徴とする撮像装置。   12. The imaging apparatus according to claim 10, wherein the synchronization signal is a vertical synchronization signal, and the blanking period is a vertical blanking period. 請求項１０乃至１２のいずれかにおいて、前記画像受信回路は前記垂直帰線期間中イネーブル信号を一定周期で生成し、各イネーブル信号に同期して前記設定コマンドに含まれる制御データを出力することを特徴とする撮像装置。   13. The image receiving circuit according to claim 10, wherein the image receiving circuit generates an enable signal at a constant cycle during the vertical blanking period, and outputs control data included in the setting command in synchronization with each enable signal. An imaging device that is characterized. 請求項１０乃至１３のいずれかにおいて、前記画像受信回路は外部から供給される設定コマンドを蓄積し前記帰線期間中に前記画像送信回路に出力するバッファメモリを具備することを特徴とする撮像装置。   14. The imaging apparatus according to claim 10, wherein the image receiving circuit includes a buffer memory that accumulates a setting command supplied from the outside and outputs the setting command to the image transmitting circuit during the blanking period. .
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