WO2010097876A1 - シリアルデータ送受信装置およびデジタルカメラ - Google Patents
シリアルデータ送受信装置およびデジタルカメラ Download PDFInfo
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- WO2010097876A1 WO2010097876A1 PCT/JP2009/006556 JP2009006556W WO2010097876A1 WO 2010097876 A1 WO2010097876 A1 WO 2010097876A1 JP 2009006556 W JP2009006556 W JP 2009006556W WO 2010097876 A1 WO2010097876 A1 WO 2010097876A1
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 128
- 238000003780 insertion Methods 0.000 claims abstract description 94
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- 230000005540 biological transmission Effects 0.000 claims abstract description 91
- 238000000034 method Methods 0.000 claims description 72
- 230000008569 process Effects 0.000 claims description 67
- 238000003384 imaging method Methods 0.000 claims description 36
- 230000011664 signaling Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 16
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M9/00—Parallel/series conversion or vice versa
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/0083—Arrangements for transferring signals between different components of the apparatus, e.g. arrangements of signal lines or cables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/21—Intermediate information storage
- H04N1/2104—Intermediate information storage for one or a few pictures
- H04N1/2112—Intermediate information storage for one or a few pictures using still video cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
- H04N1/32625—Fault detection
- H04N1/32641—Fault detection of transmission or transmitted data, e.g. interruption or wrong number of pages
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- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
- H04N1/32646—Counter-measures
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N2201/0077—Types of the still picture apparatus
- H04N2201/0084—Digital still camera
Definitions
- the present invention relates to a serial data transmitting / receiving device and a digital camera for transmitting serial format data.
- Patent Document 1 discloses a solid-state imaging device using a differential signal as an LVDS signal. Hereinafter, a solid-state imaging device using a differential signal will be described.
- FIG. 5 is a diagram showing a conventional solid-state imaging device 500 using a differential signal.
- a solid-state imaging device 500 illustrated in FIG. 5 includes a solid-state imaging device 11, an AFE (Analog Front-End) unit 100, a data format conversion unit 513, a transmission unit 14, and a data format conversion unit 515. Is provided.
- AFE Analog Front-End
- the solid-state imaging device 11 has a function of acquiring an analog image signal by imaging a subject. It is assumed that the acquired analog image signal is an image signal indicating one frame.
- the AFE unit 100 has an A / D conversion function.
- the A / D conversion function is a function that converts an analog signal into a digital signal. In the following, the process of converting an analog signal into a digital signal is referred to as A / D conversion.
- the AFE unit 100 includes an image processing unit 12 and a TG (Timing Generator) 101.
- the image processing unit 12 acquires digital image data (hereinafter referred to as digital image data) by performing A / D conversion on the analog image signal in accordance with the low-speed clock SCLK.
- the acquired digital image data is image data corresponding to one frame. In the following description, it is assumed that the image data is image data corresponding to one frame.
- the acquired digital image data includes a plurality of line data.
- the size of the image reproduced by the digital image data is, for example, a size of 1280 pixels horizontally and 760 pixels vertically
- the digital image data includes 760 line data.
- the acquired digital image data includes a plurality of pixel data.
- Pixel data is data expressed by N (for example, 24) bits.
- the acquired digital image data is parallel format image data (hereinafter referred to as parallel image data).
- the parallel image data is transmitted to the data format conversion unit 513 in units of one pixel data (N-bit data).
- N is “24”
- the image processing unit 12 and the data format conversion unit 513 are connected by 24 data lines.
- the image processing unit 12 transmits parallel image data to the data format conversion unit 513 in units of one pixel data (N-bit data).
- the data format conversion unit 513 performs a process of converting parallel format data into serial format data (hereinafter referred to as “parasiri conversion process”).
- the parallel-serial conversion process is performed according to the high-speed clock FCLK.
- the data format conversion unit 513 obtains serial-format image data (hereinafter referred to as serial image data) by performing parallel-serial conversion processing on the parallel image data.
- the data format conversion unit 513 inserts a synchronization code, which will be described later, into the serial image data when performing the parallel-serial conversion process.
- the serial image data includes the synchronization code.
- 6A and 6B are diagrams for explaining serial image data including a synchronization code.
- FIG. 6A is a diagram for explaining serial image data including a synchronization code.
- the serial image data includes line data LD1, LD2,..., LDv (v: natural number).
- LD1 line data
- LD2 size of the image obtained from the serial image data
- LDv natural number
- each of the line data LD1, LD2,..., LDv includes u (natural number) pixel data.
- each of the line data LD1, LD2,..., LDv includes 1280 pixel data.
- 1280 pieces of pixel data are pixel data P11, P12,..., P1u.
- the synchronization code SOF is a code indicating the leading edge of the frame.
- the synchronization code EOL is a code indicating the end of each line data.
- the synchronization code SOL is a code indicating the tip of each line data.
- the synchronization code EOF is a code indicating the end of the frame.
- Each of the synchronization codes SOF, EOF, EOL, SOL is composed of a plurality of bits. A unique value that does not match the pixel data is set in each of the synchronization codes SOF, EOF, EOL, and SOL.
- FIG. 6B is a diagram showing the structure of the serial image data shown in FIG. 6A according to the shape of the image obtained from the serial image data.
- a synchronization code SOL is added to the head of each line data excluding the line data LD1.
- a synchronization code SOF is added to the tip of the line data LD1.
- a synchronization code EOL is added to the end of each line data excluding the line data LDv.
- a synchronization code EOF is added to the end of the line data LDv.
- the TG 101 generates the vertical synchronization signal VSC and the horizontal synchronization signal HSC.
- the vertical synchronization signal VSC is a signal for defining the head of an image as a frame.
- the horizontal synchronization signal HSC is a signal for defining the beginning or end of each line constituting an image as a frame.
- the TG 101 transmits each of the generated vertical synchronization signal VSC and horizontal synchronization signal HSC to each of the solid-state imaging device 11, the image processing unit 12, and the data format conversion unit 513 at a corresponding predetermined timing.
- the transmission unit 14 includes transmission lines 14D and 14C.
- the data format conversion unit 513 and the data format conversion unit 515 are electrically connected by transmission paths 14D and 14C.
- Each of the transmission paths 14D and 14C is a transmission path for transferring serial data using an LVDS signal.
- Each of the transmission lines 14D and 14C is composed of a twisted pair line composed of two lines.
- the transmission line 14D is a transmission line that transmits serial data using an LVDS signal.
- the transmission line 14C is a transmission line for transmitting the clock FCLK using the LVDS signal.
- the data format conversion unit 513 transmits the serial image data into which the synchronization code is inserted as shown in FIG. 6A to the data format conversion unit 515 using the transmission path 14D.
- the data format conversion unit 513 transmits the clock FCLK to the data format conversion unit 515 using the transmission path 14C.
- the data format conversion unit 515 performs processing for converting serial format data into parallel format data (hereinafter referred to as serial-parallel conversion processing) in accordance with the clock FCLK received from the transmission line 14C.
- serial-parallel conversion processing processing for converting serial format data into parallel format data (hereinafter referred to as serial-parallel conversion processing) in accordance with the clock FCLK received from the transmission line 14C.
- the data format conversion unit 515 obtains parallel image data by performing serial-parallel conversion processing on the received serial image data.
- the data format conversion unit 515 detects the synchronization codes SOF and EOF included in the serial image data during the serial-parallel conversion process, and synchronizes the serial image data as a frame. In addition, the data format conversion unit 515 detects the synchronization codes EOL and SOL included in the serial image data during the serial-parallel conversion process, and synchronizes each line data.
- the data format conversion unit 515 transmits parallel image data to another external circuit (not shown) in units of one pixel data (N-bit data).
- the data format conversion unit 515 transmits the received clock FCLK to an external circuit.
- the data format conversion unit 515 transmits the detected synchronization code to the external circuit every time one of the synchronization codes SOF, EOF, EOL, and SOL is detected.
- serial transmission path a transmission path for transmitting serial data is referred to as a serial transmission path.
- the serial transmission path is, for example, the transmission paths 14D and 14C in FIG.
- pre-transmission data data before passing through the serial transmission path
- post-transmission data data after passing through the serial transmission path
- synchronization code SOL or the synchronization code EOL included in the serial image data as post-transmission data via the serial transmission path is missing.
- the line data corresponding to the missing synchronization code cannot be reproduced (decoded). That is, an image obtained by reproducing the serial image data on the receiving side that has received the serial image data is an image in which a line corresponding to the missing synchronization code is missing. That is, there is line data that cannot be reproduced on the receiving side that has received the serial image data.
- the conventional technology could not detect the presence of unreproducible line data.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a serial data transmitting / receiving apparatus and the like that can detect the presence of unreproducible line data. is there.
- a serial data transmitting / receiving apparatus includes a transmission unit that transmits serial data using a transmission line, and a reception unit that receives serial data from the transmission line With.
- the transmission unit includes a data format conversion unit that converts parallel image data including a plurality of line data into serial image data that is serial image data.
- the serial image data includes a plurality of continuous line data.
- the transmitting unit further determines whether or not there is unreproducible line data that is unreproducible line data between two adjacent line data in a plurality of continuous line data included in the serial image data.
- An insertion unit that performs a plurality of insertion processes for inserting determination information for the purpose.
- the data format conversion unit acquires inserted serial image data that is serial format data in which a plurality of pieces of determination information are inserted into the serial image data by the insertion unit performing a plurality of insertion processes, and the acquired inserted serial image Data is transmitted to the receiving unit using the transmission path.
- the receiving unit sequentially detects a plurality of pieces of determination information from the inserted serial image data received from the transmission path, and determines whether there is unreproducible line data based on at least a part of the plurality of detected pieces of determination information. Including a determination unit.
- the transmission unit inserts determination information for determining whether there is unreproducible line data between two adjacent line data in a plurality of continuous line data included in the serial image data.
- An insertion unit for performing a plurality of insertion processes.
- the data format conversion unit transmits the inserted serial image data in which the plurality of pieces of determination information are inserted to the reception unit using the transmission path.
- the receiving unit sequentially detects a plurality of pieces of determination information from the inserted serial image data received from the transmission path, and determines whether there is unreproducible line data based on at least a part of the plurality of detected pieces of determination information. Including a determination unit.
- the determination information indicates a numerical value for specifying the line data
- the determination unit sequentially detects a plurality of determination information from the inserted serial image data, and a value indicated by the detected latest determination information, It is determined whether there is unreproducible line data by comparing with the value indicated by the determination information detected immediately before the latest determination information.
- the insertion unit inserts first determination information as determination information between two adjacent n (natural number) line data in a plurality of continuous line data, and in the plurality of line data, A plurality of insertion processes for inserting the second determination information as the determination information is performed between the (n + 1) th two adjacent line data.
- the determination unit of the reception unit sequentially detects a plurality of pieces of determination information from the inserted serial image data, and when the two consecutive detection information detected is the first determination information or the second determination information, the reproduction is performed. It is determined that there is impossible line data.
- At least one of the first determination information and the second determination information is information indicated by 1-bit data.
- the data amount of the serially inserted serial image data including the first determination information and the second determination information as the determination information can be reduced.
- the serial data transmitting / receiving apparatus transmits an instruction for causing the receiving unit to transmit line data corresponding to the unreproducible line data again.
- a retransmission instruction unit to be provided to the unit.
- the line data corresponding to the unreproducible line data can be acquired. Therefore, a normal image can be reproduced.
- the transmission path is a transmission path that transmits data using an LVDS (Low Voltage Differential Signaling) signal.
- LVDS Low Voltage Differential Signaling
- a digital camera includes a serial data transmitting / receiving device, an image sensor that acquires an image signal by imaging a subject, and image data acquired by converting the image signal acquired by the image sensor into digital data.
- An analog front end unit to be acquired an image processing unit for processing image data, and a display unit for displaying an image based on the image data processed by the image processing unit.
- the serial data transmission / reception device acquires image data from the analog front end unit, and transmits the acquired image data to the image processing unit via the transmission unit and the reception unit.
- all or some of a plurality of components constituting such a serial data transmitting / receiving apparatus may be realized as a system LSI (Large Scale Integration).
- the present invention may be realized as a serial data transmission / reception method in which operations of characteristic components included in the serial data transmission / reception device are steps.
- the present invention may also be realized as a program that causes a computer to execute each step included in such a serial data transmission / reception method.
- the present invention may be realized as a computer-readable recording medium that stores such a program.
- the program may be distributed via a transmission medium such as the Internet.
- FIG. 1 is a diagram illustrating a configuration of the solid-state imaging device according to the first embodiment.
- FIG. 2A is a diagram for explaining inserted serial image data including a line code LC.
- FIG. 2B is a diagram for explaining the inserted serial image data including the line code LC.
- FIG. 3 is a diagram illustrating a configuration of the solid-state imaging device according to the second embodiment.
- FIG. 4A is an external view of a solid-state imaging device as a digital still camera.
- FIG. 4B is an external view of a solid-state imaging device as a digital video camera.
- FIG. 5 is a diagram showing a conventional solid-state imaging device using differential signals.
- FIG. 6A is a diagram for describing serial image data including a synchronization code.
- FIG. 6B is a diagram for describing serial image data including a synchronization code.
- the image data is image data corresponding to one frame.
- FIG. 1 is a diagram illustrating a configuration of a solid-state imaging apparatus 1000 according to the first embodiment.
- the solid-state imaging device 1000 is a digital camera such as a digital still camera or a digital video camera.
- 1 includes a solid-state imaging device 11, an AFE unit 100, a serial data transmission / reception device 200, an image processing unit 310, and a display unit 320.
- the serial data transmitting / receiving apparatus 200 includes a transmission unit 210, a transmission unit 14, and a reception unit 220.
- the transmission unit 14 in FIG. 1 includes transmission paths 14D and 14C, similar to the transmission unit 14 in FIG. Since transmission lines 14D and 14C have been described above, detailed description will not be repeated.
- the transmission unit 210 includes a data format conversion unit 13 and an insertion unit 21.
- the image processing unit 12 of the AFE unit 100 transmits parallel image data to the data format conversion unit 13 in units of one pixel data (N-bit data).
- the data format conversion unit 13 performs parallel-serial conversion processing for converting parallel format data into serial format data, similar to the data format conversion unit 513 of FIG.
- the parallel-serial conversion process is performed according to the high-speed clock FCLK.
- the data format conversion unit 13 obtains serial image data by performing parallel-serial conversion processing on the parallel image data.
- the data format conversion unit 13 inserts a synchronization code into the serial image data in the same manner as the data format conversion unit 513 when performing the parallel-serial conversion process.
- the serial image data includes the synchronization code.
- the serial image data after the synchronization code is inserted is referred to as code-added serial image data.
- the serial image data with code is, for example, data having a structure as shown in FIG. 6A.
- the TG 101 of the solid-state imaging device 1000 receives the vertical synchronization signal VSC and the horizontal synchronization signal HSC at a predetermined timing corresponding to the solid-state imaging device 11 and the image processing unit. 12 and transmit to each of the data format converter 13 and the inserter 21.
- the timing at which the vertical synchronization signal VSC and the horizontal synchronization signal HSC are transmitted is based on a general image processing technique, and therefore detailed description will not be repeated.
- the insertion unit 21 sequentially receives each of the plurality of horizontal synchronization signals HSC after receiving the vertical synchronization signal VSC.
- the insertion unit 21 increments the value of the line counter by “1” every time the horizontal synchronization signal HSC is received.
- the line counter is a counter for counting the number of line data.
- the initial value of the line counter is “0”.
- the insertion unit 21 sets the value of the line counter to “0” when receiving the vertical synchronization signal VSC again after receiving the vertical synchronization signal VSC.
- the insertion unit 21 generates a line code LC every time the value of the line counter is updated.
- the line code LC is a code for specifying line data.
- the serial image data with code generated by the data format conversion unit 13 is data as shown in FIG. 6A.
- the serial image data with code includes v (natural number) line data.
- the insertion unit 21 generates a line code LC for specifying the line data corresponding to each of the v line data included in the serial image data with code.
- the line data LD1 is the first line data.
- the value of the line code LC generated corresponding to the line data LD1 is changed after the insertion unit 21 receives the first horizontal synchronization signal HSC after receiving the vertical synchronization signal VSC.
- the value of the selected line counter is indicated. That is, in this case, the line code LC generated corresponding to the line data LD1 indicates “1”.
- the insertion unit 21 performs an insertion process every time the line code LC is generated. In the insertion process, the insertion unit 21 transmits the generated line code LC and the insertion command to the data format conversion unit 13.
- the insertion instruction includes a synchronization code EOL added to the end of the w (natural number) line data specified by the transmitted line code LC among a plurality of continuous line data included in the serial image data with code, This is a command for inserting the line code LC between the w + 1-th line data and the synchronization code SOL added to the leading end.
- the insertion command is a command for inserting the line code LC between two adjacent line data among a plurality of continuous line data.
- the data format conversion unit 13 When receiving the line code LC and the insertion command, the data format conversion unit 13 inserts the line code LC into the serial image data with code according to the insertion command. Note that the data format conversion unit 13 does not perform the process of inserting the line code LC when receiving the insertion command corresponding to the line data LDv shown in FIG. 6A.
- the insertion unit 21 performs the insertion process, so that the insertion unit 21 sends the line code LC to the data format conversion unit 13 between two adjacent line data items included in the serial image data with code. Insert between line data. That is, the insertion processing is processing for causing the data format conversion unit 13 to insert the line code LC between two adjacent line data among a plurality of continuous line data included in the serial image data with code.
- the insertion process for the code-added serial image data is completed by the insertion process being repeatedly performed by the insertion unit 21 by the number of line data included in the code-added serial image data.
- the data format conversion unit 13 obtains serial image data with code including a plurality of line codes LC (hereinafter referred to as inserted serial image data).
- the process in which the insertion process is repeatedly performed by the number of line data included in the serial image data with code is referred to as a plurality of insertion processes. That is, the insertion unit 21 performs a plurality of insertion processes by repeatedly performing the insertion process for the number of line data included in the serial image data with code.
- the multiple insertion processing is processing for causing the data format conversion unit 13 to insert the line code LC between two adjacent line data among a plurality of continuous line data included in the serial image data with code.
- the data format conversion unit 13 converts the line code LC into a plurality of continuous line data included in the serial image data with code. Of these, it inserts between two adjacent line data, and as a result, inserted serial image data is obtained.
- 2A and 2B are diagrams for explaining the inserted serial image data including the line code LC.
- FIG. 2A is a diagram showing a state in which the line code LC is inserted into the serial image data with code.
- the line code LC is, for example, between a synchronization code EOL added to the end of the first line data LD1 and a synchronization code SOL added to the tip of the second line data LD2. Inserted into.
- the line code LC between the synchronization code EOL added to the end of the first line data LD1 and the synchronization code SOL added to the tip of the second line data LD2 indicates “1”.
- the line code LC indicating “1” is a code for specifying the line data LD1.
- the line code LC indicating “v (natural number) ⁇ 1” is a code for specifying the line data LD (v ⁇ 1).
- the position where the line code LC is inserted is within the horizontal blanking period between two adjacent line data. Therefore, when the line code LC is inserted, an image reproduced from the inserted serial image data is not affected by the image quality.
- FIG. 2B is a diagram showing the structure of the inserted serial image data shown in FIG. 2A according to the shape of the image obtained from the inserted serial image data.
- the number of line codes LC included in the inserted serial image data is (v ⁇ 1).
- the line code LC shown at the right end of each row corresponds to the line data of the corresponding row.
- the line code LC in the first row is a line code corresponding to the line data LD1.
- the line code LC in the second row is a line code corresponding to the line data LD2.
- the receiving unit 220 includes a data format conversion unit 15.
- the data format conversion unit 13 and the data format conversion unit 15 are electrically connected by transmission paths 14D and 14C. Since transmission lines 14D and 14C have been described above, detailed description will not be repeated.
- the data format conversion unit 13 transmits the inserted serial image data with the line code LC inserted as shown in FIG. 2A to the data format conversion unit 15 using the transmission line 14D.
- the data format conversion unit 13 transmits the clock FCLK to the data format conversion unit 15 using the transmission path 14C. Similar to the data format conversion unit 515 of FIG. 5, the data format conversion unit 15 performs serial-parallel conversion processing for converting serial format data into parallel format data in accordance with the clock FCLK received from the transmission path 14C. The data format conversion unit 15 obtains parallel image data by performing serial-parallel conversion processing on the inserted serial image data.
- the data format conversion unit 15 detects the synchronization codes SOF, EOL, SOL, and EOF included in the inserted serial image data during the parallel-serial conversion processing, like the data format conversion unit 515 of FIG.
- the data format conversion unit 15 sequentially detects a plurality of line codes LC included in the inserted serial image data during the serial-parallel conversion process.
- the data format conversion unit 15 performs a determination process every time the line code LC is detected.
- the value indicated by the latest line code LC detected by the data format conversion unit 15 (hereinafter referred to as the latest line value) is the value indicated by the line code LC detected immediately before the latest line code LC. It is determined whether or not the value is 1 larger than (hereinafter, the previous line value).
- the data format conversion unit 15 does not perform a determination process when the first line code LC is detected.
- the data format conversion unit 15 determines that the line data corresponding to the detected latest line code LC can be reproduced (decoded). To do.
- the data format conversion unit 15 converts the line data corresponding to the detected latest line code LC into unreproducible line data (hereinafter referred to as “line data”). (It is referred to as unreproducible line data). That is, the data format conversion unit 15 determines that there is unreproducible line data.
- the data format conversion unit 15 is a determination unit that determines whether there is unreproducible line data.
- the line code LC is also determination information for determining whether there is unreproducible line data.
- the situation is as follows. For example, in the period when the inserted serial image data is transmitted in the transmission line 14D, noise or the like is generated in the transmission line 14D.
- the synchronization code SOL or the synchronization code EOL included in the inserted serial image data is generated. This is a missing situation.
- the data format conversion unit 15 transmits the parallel format image data obtained by the serial-parallel conversion process to the image processing unit 310 in units of one pixel data (N-bit data).
- the image processing unit 310 performs various image processing on the received image data. Then, the image processing unit 310 transmits the image processed image data to the display unit 320.
- the display unit 320 is a display device for displaying an image.
- the display unit 320 displays an image based on the image data received from the image processing unit 310.
- an inserted serial image in which a line code LC is inserted between two adjacent line data among a plurality of continuous line data included in the serial image data with code.
- Data is transmitted to the receiving unit 220.
- the data format conversion unit 15 of the reception unit 220 sequentially detects a plurality of line codes LC included in the received inserted serial image data.
- the latest line value indicated by the latest line code LC is the previous line indicated by the line code LC detected immediately before the latest line code LC. It is determined whether or not there is unreproducible line data by determining whether or not the value is one larger than the value. That is, according to the present embodiment, it can be detected that there is line data that cannot be reproduced.
- all or part of the solid-state imaging device 11, the image processing unit 12, the data format conversion unit 13, the transmission paths 14D and 14C, the data format conversion unit 15, and the insertion unit 21 is a one-chip LSI (Large Scale Integration). It may be configured.
- a solid-state imaging device is the solid-state imaging device 1000 of FIG. Therefore, detailed description of each part included in solid-state imaging device 1000 will not be repeated.
- the line code LC to be inserted into the serial image data with code is 1-bit data. That is, in the modification of the present embodiment, the insertion unit 21 generates a line code LC that represents 1-bit data, and performs processing for inserting the generated line code LC into code-added serial image data.
- this is different from the first embodiment. Since other processes are the same as those in the first embodiment, detailed description will not be repeated.
- the insertion unit 21 increments the value of the line counter by “1” every time the horizontal synchronization signal HSC is received.
- the insertion unit 21 generates a line code LC every time the value of the line counter is updated. Specifically, the insertion unit 21 generates a line code LC indicating “0” when the value of the updated line counter is an odd number. Further, the insertion unit 21 generates a line code LC indicating “1” when the value of the updated line counter is an even number.
- the insertion part 21 performs the insertion process A every time the line code LC is generated.
- the insertion unit 21 transmits the generated line code LC and the insertion instruction A to the data format conversion unit 13.
- the insertion instruction A is a synchronization code added to the end of the w th line data corresponding to the w (natural number) th line code LC to be transmitted among a plurality of continuous line data included in the serial image data with code.
- This is an instruction for inserting the line code LC between the EOL and the synchronization code SOL added to the leading end of the (w + 1) th line data.
- the first line data corresponding to the transmitted first line code LC is the line data LD1.
- the insertion instruction A is an instruction for inserting the line code LC between two adjacent line data among a plurality of continuous line data.
- the data format conversion unit 13 When receiving the line code LC and the insertion instruction A, the data format conversion unit 13 inserts the line code LC into the serial image data with code according to the insertion instruction A.
- the data format conversion unit 13 does not perform the process of inserting the line code LC when receiving the insertion instruction A corresponding to the line data LDv shown in FIG. 6A.
- the insertion process A is repeatedly performed by the insertion unit 21 by the number of line data included in the code-added serial image data, whereby the insert process A for the code-added serial image data ends.
- the data format conversion unit 13 obtains serial image data with code including a plurality of line codes LC (hereinafter referred to as alternately inserted serial image data). .
- the process in which the insertion process A is repeatedly performed by the number of line data included in the serial image data with code is referred to as an alternate insertion process. That is, the insertion unit 21 performs the alternate insertion process by repeatedly performing the insertion process A as many times as the number of line data included in the serial image data with code.
- the alternate insertion process is a process of causing the data format conversion unit 13 to insert the line code LC between two adjacent line data among a plurality of continuous line data included in the serial image data with code. That is, the alternate insertion process is the multiple insertion process described above.
- the line code LC indicating “0” and the line code LC indicating “1” are referred to as a first line code LC and a second line code LC, respectively.
- the first line code LC and the second line code LC are also referred to as first determination information and second determination information, respectively.
- the insertion process A is repeated for the number of line data included in the serial image data with code.
- the serial image data having the alternately inserted data structure shown in FIG. 2A is generated.
- the line code LC between the first two adjacent line data LD1 and LD2 is the first line code LC.
- the line code LC between the two adjacent two line data LD2 and LD3 is the second line code LC.
- the insertion unit 21 performs the above-described alternate insertion process.
- the alternate insertion process inserts a first line code LC between two adjacent line data of n (natural number) in a plurality of continuous line data included in serial image data with code, and the plurality of lines In the data, this is a multiple insertion process for inserting the second line code LC between two (n + 1) th adjacent line data.
- the insertion process A for transmitting the first line code LC and the insertion instruction A is performed, so that the data format conversion unit 13 performs n in a plurality of continuous line data included in the serial image data with code.
- a first line code LC (first determination information) is inserted between two adjacent pieces of line data.
- the insertion process A for transmitting the second line code LC and the insertion instruction A is performed, so that the data format conversion unit 13 can detect the continuous line data included in the code-added serial image data.
- the second line code LC (second determination information) is inserted between the two (n + 1) th adjacent line data.
- the data format conversion unit 13 obtains alternately inserted serial image data.
- the data format conversion unit 13 uses the transmission path 14D to transmit the alternately inserted serial image data into which the line code LC is inserted as shown in FIG. 2A to the data format conversion unit 15.
- the data format conversion unit 15 sequentially detects a plurality of line codes LC included in the alternately inserted serial image data during the serial-parallel conversion process.
- the data format conversion unit 15 performs the determination process A every time the line code LC is detected. In the determination processing A, the latest line value indicated by the latest line code LC detected by the data format conversion unit 15 is different from the previous line value indicated by the line code LC detected immediately before the latest line code LC. It is determined whether or not.
- the data format conversion unit 15 does not perform the determination process A when the first line code LC is detected.
- the data format conversion unit 15 determines that the line data corresponding to the detected latest line code LC can be reproduced (decoded).
- the two continuous line codes LC indicating the latest line value and the previous line value are the first line code LC and the second line code LC, respectively.
- the data format conversion unit 15 detects the latest line code LC detected.
- the line data corresponding to is determined to be unreproducible line data (hereinafter referred to as unreproducible line data). That is, the data format conversion unit 15 determines that there is unreproducible line data.
- the two continuous line codes LC respectively indicating the latest line value and the previous line value are the first line code LC or the second line code LC.
- the data format conversion unit 15 as a determination unit sequentially detects a plurality of determination information (line code LC) from the inserted serial image data (alternately inserted serial image data), and detects two consecutive determination information detected.
- line code LC is the first determination information (first line code LC) or the second determination information (second line code LC)
- the line code LC is 1-bit data. Therefore, it is possible to reduce the data amount of the serially inserted serial image data to be transmitted in the transmission path 14D. Therefore, an effect is obtained that a circuit for determining the presence or absence of unreproducible line data can be reduced.
- FIG. 3 is a diagram illustrating a configuration of a solid-state imaging device 1000A according to the second embodiment.
- the solid-state imaging device 1000A is a digital camera such as a digital still camera or a digital video camera.
- FIG. 3 differs from the solid-state imaging device 1000 of FIG. 1 in that it includes a serial data transmission / reception device 200A instead of the serial data transmission / reception device 200. Other than that, it is the same as that of the solid-state imaging device 1000, and thus detailed description will not be repeated.
- the serial data transmission / reception device 200A is different from the serial data transmission / reception device 200 in FIG. 1 in that a transmission unit 210A is provided instead of the transmission unit 210 and a reception unit 220A is provided instead of the reception unit 220. Other than that, it is similar to serial data transmitting / receiving apparatus 200, and therefore detailed description will not be repeated.
- the transmission unit 210A is different from the transmission unit 210 of FIG. 1 in that it further includes a line memory 32 and a switch SW10. Other than that, it is the same as that of the transmission unit 210, and thus detailed description will not be repeated.
- the line memory 32 is a memory capable of storing one line data.
- the switch SW10 switches between the first connection state and the second connection state according to an instruction from the outside.
- the first connection state is a state in which the data format conversion unit 13 and the transmission line 14D are electrically connected.
- the second connection state is a state in which the line memory 32 and the transmission line 14D are electrically connected.
- the normal state of the switch SW10 is the first connection state.
- the data format conversion unit 13 is electrically connected to each of the switch SW10 and the line memory 32.
- the data format conversion unit 13 switches the inserted serial image data to the switch SW10 in units of line data corresponding to one row shown in FIG. 2B. And to the line memory 32.
- the data format conversion unit 13 converts the serially inserted serial image data into a line corresponding to one row shown in FIG. 2B.
- the data is transmitted to the switch SW10 and the line memory 32 in units of data.
- the line memory 32 receives part of the line data of the inserted serial image data or the alternately inserted serial image data, and stores the received data.
- the line memory 32 stores new line data when new line data is received while the line data is stored. That is, the line memory 32 holds the line data until new line data is received.
- the switch SW10 uses the transmission path 14D to send the received inserted serial image data or alternately inserted serial image data in units of line data corresponding to one row shown in FIG. 2B to the data format conversion unit 15. Send.
- the receiving unit 220A is different from the receiving unit 220 of FIG. 1 in that it further includes a CPU (Central Processing Unit) 31. Other than that, it is the same as the receiving unit 220, and therefore, detailed description will not be repeated.
- CPU Central Processing Unit
- the data format conversion unit 15 performs the determination process described in the first embodiment. If the data format conversion unit 15 determines that there is unreproducible line data by the determination process, the data format conversion unit 15 transmits unreproducible line presence information to the CPU 31.
- the unreproducible line presence information is information for notifying that unreproducible line data exists.
- the data format conversion unit 15 performs the determination process A described in the modification of the first embodiment. If the data format conversion unit 15 determines that there is unreproducible line data by the determination process A, the data format conversion unit 15 transmits unreproducible line presence information to the CPU 31.
- the CPU 31 recognizes that there is unreproducible line data by receiving the unreproducible line presence information. Note that the non-reproducible line presence information is received by interrupt processing or polling processing.
- the CPU 31 transmits a state setting instruction for setting the state of the switch SW10 to the second connection state to the switch SW10.
- the switch SW10 When the switch SW10 receives the state setting instruction, the switch SW10 switches the state of the switch SW10 to the second connection state. Thereby, the line data corresponding to the non-reproducible line data stored in the line memory 32 is transmitted (retransmitted) to the data format conversion unit 15 via the transmission path 14D.
- the state setting instruction is an instruction for causing the data format conversion unit 15 to transmit the line data corresponding to the unreproducible line data again.
- the timing at which the CPU 31 transmits the state setting instruction is a timing within a horizontal blanking period between two adjacent line data.
- the CPU 31 when it is determined that there is unreproducible line data, the CPU 31 transmits the line data corresponding to the unreproducible line data to the data format conversion unit 15 again. I do. That is, the CPU 31 is a retransmission instruction unit that gives a state setting instruction for transmitting line data corresponding to unreproducible line data to the receiving unit 220A again to the transmitting unit 210A.
- the line memory 32 may be a memory that stores inserted serial image data or alternately inserted serial image data for one frame.
- the CPU 31 transmits a state setting instruction to the switch SW10. Thereby, the inserted serial image data or the alternately inserted serial image data stored in the line memory 32 is transmitted (retransmitted) to the data format conversion unit 15 via the transmission path 14D.
- all or part of the solid-state imaging device 11, the image processing unit 12, the data format conversion unit 13, the transmission paths 14D and 14C, the data format conversion unit 15, the insertion unit 21, the switch SW10, and the CPU 31 are one-chip LSIs. It may be configured.
- FIG. 4A is an external view of the solid-state imaging device 1000, 1000A as a digital still camera.
- FIG. 4B is an external view of solid-state imaging devices 1000 and 1000A as digital video cameras.
- all or some of the plurality of constituent elements constituting the serial data transmitting / receiving apparatus may be configured by hardware. Further, all or part of the constituent elements constituting the serial data transmitting / receiving apparatus may be a module of a program executed by a CPU (Central Processing Unit) or the like.
- a CPU Central Processing Unit
- the system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on one chip. Specifically, a microprocessor, a ROM (Read Only Memory), a RAM (Random Access Memory), etc. It is a computer system comprised including.
- the present invention may be realized as a serial data transmission / reception method in which operations of characteristic components included in the serial data transmission / reception device are steps.
- the present invention may also be realized as a program that causes a computer to execute each step included in such a serial data transmission / reception method.
- the present invention may be realized as a computer-readable recording medium that stores such a program.
- the program may be distributed via a transmission medium such as the Internet.
- the present invention can be applied to solid-state imaging devices such as digital still cameras and digital video cameras that need to transmit serial-format image data at high speed.
- SW10 Switch 11 Solid-state imaging device 12 310 Image processing unit 13, 15, 513, 515 Data format conversion unit 14 Transmission unit 21 Insertion unit 31
- CPU 32 line memory 100
- AFE unit 200 200A serial data transmitting / receiving device 210, 210A transmitting unit 220, 220A receiving unit 320 display unit 1000, 1000A solid-state imaging device
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Abstract
Description
本実施の形態では、隣り合う2つのラインデータの間に、同期コードの他に、判定情報を挿入する処理を行うことにより、再生不能なラインデータがあることを検知する。
本実施の形態の変形例における固体撮像装置は、図1の固体撮像装置1000である。そのため、固体撮像装置1000に含まれる各部の詳細な説明は繰り返さない。
本実施の形態では、再生不能ラインデータがあると判定された場合、再生不能ラインデータに対応するラインデータの再送を行う処理を行う。
11 固体撮像素子
12,310 画像処理部
13,15,513,515 データ形式変換部
14 伝送部
21 挿入部
31 CPU
32 ラインメモリ
100 AFE部
200,200A シリアルデータ送受信装置
210,210A 送信部
220,220A 受信部
320 表示部
1000,1000A 固体撮像装置
Claims (8)
- 伝送路を使用してシリアル形式のデータを送信する送信部と、前記伝送路から前記シリアル形式のデータを受信する受信部とを備えるシリアルデータ送受信装置であって、
前記送信部は、
複数のラインデータを含むパラレル形式の画像データを、シリアル形式の画像データであるシリアル画像データに変換するデータ形式変換部を含み、
前記シリアル画像データは、連続する前記複数のラインデータを含み、
前記送信部は、さらに、
前記シリアル画像データに含まれる連続する前記複数のラインデータにおいて、各隣り合う2つのラインデータの間に、再生不能なラインデータである再生不能ラインデータがあるか否かを判定するための判定情報を挿入するための複数挿入処理を行う挿入部を含み、
前記データ形式変換部は、前記挿入部が前記複数挿入処理を行うことにより、前記シリアル画像データに複数の前記判定情報が挿入されたシリアル形式のデータである挿入済シリアル画像データを取得し、取得した前記挿入済シリアル画像データを、前記伝送路を使用して、前記受信部へ送信し、
前記受信部は、
前記伝送路から受信した前記挿入済シリアル画像データから、複数の前記判定情報を順次検出し、検出した複数の前記判定情報の少なくとも一部に基づいて、前記再生不能ラインデータがあるか否かを判定する判定部を含む、
シリアルデータ送受信装置。 - 前記判定情報は、ラインデータを特定するための数値を示し、
前記判定部は、前記挿入済シリアル画像データから、複数の前記判定情報を順次検出し、検出した最新の判定情報が示す値と、該最新の判定情報の1つ前に検出した判定情報が示す値とを比較することにより、前記再生不能ラインデータがあるか否かを判定する、
請求項1に記載のシリアルデータ送受信装置。 - 前記挿入部は、前記連続する複数のラインデータにおいて、n(自然数)番目の隣り合う2つのラインデータの間に、判定情報としての第1判定情報を挿入し、該複数のラインデータにおいて、n+1番目の隣り合う2つのラインデータの間に、判定情報としての第2判定情報を挿入するための前記複数挿入処理を行う、
請求項1に記載のシリアルデータ送受信装置。 - 前記受信部の前記判定部は、前記挿入済シリアル画像データから、複数の前記判定情報を順次検出し、検出した連続する2つの判定情報が、前記第1判定情報または前記第2判定情報である場合、前記再生不能ラインデータがあると判定する、
請求項3に記載のシリアルデータ送受信装置。 - 前記第1判定情報および前記第2判定情報の少なくとも一方は、1ビットのデータで示される情報である、
請求項3または4に記載のシリアルデータ送受信装置。 - 前記シリアルデータ送受信装置は、さらに、
前記判定部が再生不能ラインデータがあると判定した場合、該再生不能ラインデータに対応するラインデータを、再度、前記受信部へ送信させるための指示を、前記送信部へ与える再送指示部を備える、
請求項1~5のいずれかに記載のシリアルデータ送受信装置。 - 前記伝送路は、LVDS(Low Voltage Differential Signaling)信号によりデータを伝送する伝送路である、
請求項1~6のいずれかに記載のシリアルデータ送受信装置。 - 請求項1~7のいずれかに記載のシリアルデータ送受信装置と、
被写体を撮像することにより画像信号を取得する撮像素子と、
前記撮像素子が取得した前記画像信号をデジタルデータに変換することにより画像データを取得するアナログ・フロントエンド部と、
画像データを処理するための画像処理部と、
前記画像処理部により処理された画像データに基づく画像を表示するための表示部とを備え、
前記シリアルデータ送受信装置は、前記アナログ・フロントエンド部から前記画像データを取得し、取得した前記画像データを、前記送信部および前記受信部を介して、前記画像処理部へ送信する、
デジタルカメラ。
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