JP2007075288A - Receiver, transmitter, and transmitting/receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase resistance to bit error even if a data transformation occurs in parameter information, and to minimize image signals which become invalid. <P>SOLUTION: For the parameter information such as white balance coefficient information "WB" or capsule peculiar ID information "ID" is loaded with error correcting codes "RS1" and "RS2" to be transmitted and output. The receiving side performs the error correction for the parameter information such as the white balance coefficient information "WB" or the capsule peculiar ID information "ID" by using the error correcting codes "RS1" and "RS2". Thus, even if the bit error such as the data transformation occurs in the parameter information itself, the data are corrected by an error correcting process, and the resistance to the bit error can be increased, and image signals which become invalid can be minimized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission device that transmits a captured video signal, a reception device that receives the video signal using an antenna, and a transmission / reception system that includes the transmission device and the reception device, and in particular, a capsule type in a subject. The present invention relates to a transmission / reception system that receives a radio video signal transmitted from an endoscope using an antenna outside a subject.

  In recent years, swallowable capsule endoscopes have appeared in the field of endoscopes. This capsule endoscope is provided with an imaging function and a wireless communication function. Capsule endoscopes are peristaltic in the body cavity, for example, the stomach, small intestine, etc., after being swallowed from the patient's mouth for observation (examination) and before being spontaneously discharged from the human body. And has a function of sequentially imaging (see, for example, Patent Document 1).

  While moving inside the body cavity, image data imaged inside the body by the capsule endoscope is sequentially transmitted to the outside by wireless communication and stored in a memory provided in an external receiver. When the patient carries the receiver having the wireless communication function and the memory function, the patient can freely act even during the period from swallowing the capsule endoscope until it is discharged. Thereafter, the doctor or nurse can make a diagnosis by displaying an organ image on the display based on the image data stored in the memory.

  Here, when transmitting image data from the capsule endoscope to the receiver, the capsule unique ID for specifying the capsule endoscope that is the transmission source, and the imaging of the CCD or the like in the capsule endoscope Parameter information such as white balance coefficient data for performing white balance processing on the imaging data of the element is also transmitted. These parameter information is transmitted using a phase during which the original video signal is not transmitted, for example, a blank period during which the vertical synchronization signal and the horizontal synchronization signal are transmitted and output, and then the original video signal is transmitted. I am trying to send it.

Japanese Patent Laid-Open No. 2003-19111

  However, in such wireless communication between the capsule endoscope and the receiver, a bit error such as garbled data may occur as in the case of other wireless communication. If garbled data is generated in the capsule unique ID or the white balance coefficient data, the video data transmitted later cannot be received as a correct image even if it is correct. For example, if the white balance coefficient data is garbled, the image processing result will be image data that is out of color balance with the original image, and this will cause trouble in diagnosing the body cavity image by color. The entire frame image becomes invalid.

  On the other hand, there is a possibility that the video signal itself may be garbled. However, in the case of the video signal, it can be corrected by guessing from the previous and next video signals, as in the case where the parameter information is garbled. It is rarely fatal.

  The present invention has been made in view of the above, and can improve the tolerance against bit errors and reduce invalid video signals as much as possible even when parameter information is garbled. An object of the present invention is to provide a transmission device and a transmission / reception system.

  In order to solve the above-described problems and achieve the object, the receiving apparatus of the invention according to claim 1 is an information main body unit including at least an information main body based on a video signal, which is a radio signal transmitted from a moving transmitting apparatus Is a receiving device that uses a antenna to receive a radio signal having a frame structure having synchronization information and an additional unit including parameter information unique to the transmitting device. A detection unit that detects an arrangement position of the parameter information in which an arrangement position in a frame configuration transmitted with a correction code is added is defined in advance, and is added immediately after the detected arrangement position of the parameter information. A parameter information error correction unit that performs error correction of the parameter information using an error correction code that is present, and the information using the parameter information that has been error corrected. Characterized in that and an image processing unit which performs image processing on the video signal of the main body portion.

  According to a second aspect of the present invention, there is provided a receiving apparatus according to the second aspect, wherein an arrangement position in a frame structure to which an error correction code is added immediately after transmission from a received radio signal is defined in advance and the parameter information and Using a vertical synchronization code position detection unit for detecting the arrangement position of a code indicating a vertical synchronization signal having a specific arrangement relationship, and an error correction code added immediately after the arrangement position of the code indicating the detected vertical synchronization signal And a vertical synchronization error correction unit for correcting an error of a code indicating the vertical synchronization signal.

  According to a third aspect of the present invention, there is provided a receiving apparatus according to the third aspect of the present invention, wherein in the above-mentioned invention, a horizontal synchronization signal in which an arrangement position on a frame configuration is transmitted in advance after an error correction code is added immediately after being received. A horizontal synchronization code position detecting unit for detecting the arrangement position of the code indicating the horizontal synchronization signal, and an error correction code added immediately after the arrangement position of the code indicating the detected horizontal synchronization signal An error correction unit for horizontal synchronization that performs error correction.

  According to a fourth aspect of the present invention, in the above invention, the parameter information includes unique ID information for determining the transmission device.

  The receiving apparatus according to a fifth aspect of the present invention is the receiving apparatus according to the fifth aspect, wherein the parameter information is white balance coefficient data for performing white balance processing on imaging data of an imaging device for obtaining a video signal in the transmitting apparatus. It is characterized by including.

  According to a sixth aspect of the present invention, in the above invention, the parameter information includes data indicating an address of a pixel defect of an image sensor for obtaining a video signal in the transmission device.

  According to a seventh aspect of the present invention, in the above invention, the error correction code is a Reed-Solomon code.

  A transmission apparatus according to an eighth aspect of the present invention includes a frame configuration including at least an information main body including an information main body based on a video signal obtained by imaging, and an additional section including synchronization information and parameter information unique to the transmission apparatus Is a transmission apparatus that receives a radio signal of an antenna and receives it by a reception apparatus equipped with an antenna, and an error correction code for the parameter information immediately after the parameter information that is transmitted with a predetermined arrangement position in a frame configuration. A signal processing unit for adding and outputting is provided.

  According to a ninth aspect of the present invention, in the transmission device according to the ninth aspect, in the above-mentioned invention, the signal processing unit has a vertical synchronization in which an arrangement position on a frame configuration is specified in advance so as to have a specific arrangement relationship with the parameter information. An error correction code for the code indicating the vertical synchronization signal is added immediately after the code indicating the signal, and then output.

  According to a tenth aspect of the present invention, in the transmission device according to the tenth aspect, in the above invention, the signal processing unit outputs the horizontal synchronization signal immediately after a code indicating a horizontal synchronization signal to be transmitted and output with a predetermined arrangement position on the frame configuration. An error correction code for the indicated code is added and output.

  A transmission / reception system according to an eleventh aspect of the present invention is a frame configuration having an information main body including at least an information main body based on a video signal obtained by imaging, and an additional section including synchronization information and parameter information unique to the transmission apparatus A transmission / reception system comprising: a transmission device that transmits a wireless signal; and a reception device that receives the wireless signal transmitted from the moving transmission device using an antenna, wherein the transmission device has a frame configuration A signal processing unit that outputs an error correction code for the parameter information immediately after the parameter information that is transmitted with the arrangement position defined in advance is output, and the receiving device receives the parameter from the received radio signal. A detection unit for detecting an arrangement position of the information, and an error correction code added immediately after the detected arrangement position of the parameter information; A parameter information error correction unit that performs error correction of the parameter information using, and an image processing unit that performs image processing on a video signal of the information main body unit using the parameter information that has been error corrected. It is characterized by.

  According to the receiving apparatus, transmitting apparatus, and transmission / reception system of the present invention, error correction codes are added to parameter information such as unique ID information and white balance coefficient information for determining the transmitting apparatus, and the output is transmitted. On the receiving side, since error correction of parameter information is performed using an error correction code, even if a bit error such as data corruption occurs in the parameter information itself, it can be made correct data by error correction processing, Therefore, it is possible to increase resistance to bit errors in the parameter information, and to reduce the number of invalid video signals as much as possible. Further, since error correction codes are added only with respect to predetermined parameter information, and error correction codes are not added to video signals themselves that occupy most of the information, data redundancy can be suppressed to the minimum necessary.

  A wireless in-vivo information acquiring system, which is a preferred embodiment of a receiving device, a transmitting device, and a transmission / reception system according to the present invention, will be described below with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments. In the description of the drawings, the same parts are denoted by the same reference numerals.

(Embodiment 1)
This wireless in-subject information acquisition system corresponds to a transmission / reception system, and uses a capsule endoscope as an example of a transmission device (intra-subject introduction device).

  FIG. 1 is a schematic diagram showing the overall configuration of a wireless in-vivo information acquiring system. As shown in FIG. 1, a wireless in-vivo information acquiring system is introduced into a body of a receiving device 2 having a wireless receiving function and a subject 1, and captures an in-vivo image to the receiving device 2. And a capsule endoscope (intra-subject introduction device) 3 that wirelessly transmits data such as video signals. The in-subject information acquisition system also includes a display device 4 that displays an intra-body cavity image based on a video signal received by the receiving device 2, and a portable device for transferring data between the receiving device 2 and the display device 4. A mold recording medium 5. The receiving device 2 includes a receiving jacket 2a worn by the subject 1 and an external device 2b that performs processing of a radio signal received through the receiving jacket 2a.

  The display device 4 is for displaying an in-vivo image captured by the capsule endoscope 3, and has a configuration such as a workstation that displays an image based on data obtained by the portable recording medium 5. Have Specifically, the display device 4 may be configured to directly display an image by a CRT display, a liquid crystal display, or the like, or may be configured to output an image to another medium such as a printer.

  The portable recording medium 5 can be attached to and detached from the external device 2b and the display device 4, and has a structure capable of outputting or recording information when being inserted into both. Specifically, the portable recording medium 5 is inserted into the external device 2 b and transmitted from the capsule endoscope 3 while the capsule endoscope 3 is moving in the body cavity of the subject 1. Record the data. Then, after the capsule endoscope 3 is ejected from the subject 1, that is, after imaging of the inside of the subject 1 is finished, the capsule endoscope 3 is taken out from the external device 2b and inserted into the display device 4 to be attached to the display device. The data recorded by 4 is read out. When data is transferred between the external device 2b and the display device 4 by a portable recording medium 5 such as a compact flash (registered trademark) memory, and the external device 2b and the display device 4 are connected by wire. In addition, the subject 1 can freely operate during imaging in the body cavity, and also contributes to shortening of data transfer time with the display device 4. Here, the portable recording medium 5 is used for data transfer between the external device 2b and the display device 4. However, the present invention is not limited to this, and the external device 2b has another built-in recording device. In order to exchange data with the display device 4, both may be connected by wire or wirelessly.

  Here, the capsule endoscope 3 will be described. FIG. 2 is a block diagram schematically showing the configuration of the capsule endoscope 3. As shown in FIG. 2, the capsule endoscope 3 includes an LED 19 for irradiating an imaging region when photographing the inside of the subject 1, an LED driving circuit 20 for controlling the driving state of the LED 19, and the LED 19. A CCD 21 is provided as an image pickup device that picks up an image of the irradiated region, and a signal processing circuit 22 that processes an image signal output from the CCD 21 into image information of a desired format. The capsule endoscope 3 includes a CCD driving circuit 25 that controls the driving state of the CCD 21 and an RF transmission unit that generates an RF signal by modulating image data captured by the CCD 21 and processed by the signal processing circuit 22. 23, a transmission antenna unit 24 that transmits an RF signal output from the RF transmission unit 23, and a system control circuit 26 that controls the operation of the LED drive circuit 20, the CCD drive circuit 25, and the RF transmission unit 23. The CCD 21, the signal processing circuit 22, and the CCD driving circuit 25 are collectively referred to as an imaging circuit 27.

  By providing these mechanisms, the capsule endoscope 3 acquires image information of the region to be examined illuminated by the LED 19 by the CCD 21 while being introduced into the subject 1. The acquired image information is signal-processed into a video signal by the signal processing circuit 22, and this video signal is converted into an RF signal in the RF transmission unit 23 and then transmitted to the outside via the transmission antenna unit 24.

  Here, the signal processing circuit 22 includes a parameter / error correction code adding unit 22a. The parameter / error correction code adding unit 22a includes white balance coefficient data “WB” and capsule unique ID information “ID” as parameter information unique to the capsule endoscope 3 stored in advance in the parameter memory 28. In addition, the white balance coefficient data “WB”, the Reed-Solomon codes “RS1” and “RS2” as error correction code data for the capsule unique ID information “ID”, the vertical synchronization signal of the video signal in one frame and the horizontal It is added so that it is transmitted and output at a predetermined arrangement position defined in advance so as to be synchronized with the synchronization signal.

  That is, in the first embodiment, the capsule endoscope 3 is synchronized with information body information including an information body based on at least a video signal obtained by imaging and parameter information unique to the capsule endoscope 3. As a white balance coefficient data “WB” and an additional unit including capsule unique ID information “ID” to transmit a frame-structured radio signal, white balance coefficient data “WB”, capsule unique ID Reed-Solomon codes “RS1” and “RS2” are added immediately after the information “ID”.

  Referring to FIG. 5 showing a timing chart of the receiving operation of the receiving apparatus 2 described later, a 16-bit code “55 00 FF 55” is used as a code indicating the vertical synchronization signal VSYNC (VD), and the operation starts from the start. Set so that the count value HCOUNT of the horizontal sync signal during the phase in which the count value VCOUNT is “10” is assigned to a specific line position defined by “352”, “353”, “354”, and “355” and transmitted. Has been. Further, a 16-bit code “55 AA FF 55” is used as a code indicating the horizontal synchronization signal HSYNC (HV), and the count value HCOUNT of the horizontal synchronization signal during the phase in which the count value VCOUNT from the operation start is “11”. Is assigned to a specific line position defined by “2”, “3”, “4”, and “5”, and is set to be transmitted and output. The white balance coefficient data “WB”, capsule unique ID information “ID”, Reed-Solomon codes “RS1” and “RS2” are, for example, 1 byte each for a total of 4 bytes, and these vertical synchronization signals VSYNC Between the code indicating (VD) and the code indicating the horizontal synchronization signal HSYNC (HV), and the count value HCOUNT of the horizontal synchronization signal in the phase where the count value VCOUNT is “10” is “357” “358” “359” Each line is assigned to a specific line position defined by “360” and is set to be transmitted. In FIG. 5, a period A indicates a waiting time until the receiving circuit 11 of the receiving device 2 is turned on and stabilizes, and a period B indicates a waiting time until the PLL circuit in the clock recovery 61 is turned on and locked. A period C indicates a video signal reception period.

  Here, the data “WB” of the white balance coefficient is data for performing white balance processing on the imaging data of the CCD 21, and the white color unique to the CCD 21 in advance by a test in the manufacturing process of each capsule endoscope 3. This is data obtained as a balance coefficient. Specifically, a white chart as a reference is imaged by the CCD 21, and a correction coefficient (white balance) calculated so that the output of red (R) and blue (B) becomes a specified value with green (G) as a reference. Coefficient) and stored in the parameter memory 28.

  Note that the unique parameter information is not limited to such white balance coefficient data, but is, for example, data indicating the pixel defect address of the CCD 21 and based on pixel data corresponding to addresses around the pixel defect address. Thus, the pixel defect existing at the address may be corrected. Further, instead of the CCD as the image sensor, for example, an offset value of the photoelectric conversion characteristic, which is a value unique to each CMOS sensor when a CMOS sensor is used, is stored in the parameter memory 28 as a signal processing parameter unique to each element. You may make it store beforehand.

  The capsule unique ID information “ID” is identification number data given in advance for each capsule endoscope 3 in order to individually determine the capsule endoscope 3 and is stored in the parameter memory 28 in advance. The

  Furthermore, Reed-Solomon codes “RS1” and “RS2” are codes calculated as error correction codes for data “WB” and capsule unique ID information “ID” calculated and set in advance, and parameter memory 28 is stored in advance. Note that the error correction code is not limited to the Reed-Solomon code, but may be another code such as a Hamming code.

  In addition, the capsule endoscope 3 includes a sensor unit 35 that detects a signal such as predetermined magnetism, light, and radio waves, and an LED drive circuit 20 and a CCD drive circuit 25 based on values detected by the sensor unit 35. , An RF transmission unit 23, and a drive control unit 34 that controls the drive of a system control circuit 26 that controls the overall processing of each unit. The sensor unit 35 is realized by, for example, a pH sensor, and detects whether or not the capsule endoscope 3 has reached a predetermined position in the subject. Based on this result, the drive control unit 34 performs the control of each unit. Control the drive. Thereby, power consumption can be suppressed.

  Further, the drive control unit 34 receives power supplied from the battery 40 as an energy supply source via the power switch 33 in the power switch circuit 30. The battery 40 is realized by a button type battery such as silver oxide. The power switch 33 is a main power switch of the capsule endoscope 3 so to speak. The power switch circuit 30 further includes a signal detection circuit 31 and a switch control circuit 32. The signal detection circuit 31 that detects a signal from the outside of the capsule endoscope 3 is realized by a reed switch, and is turned on and off by the proximity and separation of the magnet 50 with respect to the reed switch. In other words, the switch control circuit 32 that performs an on / off operation depending on whether or not a magnetic force acts on the reed switch is configured to toggle the on / off of the power switch 33 based on the control signal from the signal detection circuit 31, that is, the on / off signal. Control. The power switch 33 is turned on and off by the magnet 50 before being introduced into the subject 1, and the operation of the capsule endoscope 3 is checked.

  Here, the receiving apparatus 2 will be described with reference to FIG. The receiving device 2 has a function of receiving in-vivo image data wirelessly transmitted from the capsule endoscope 3. FIG. 3 is a block diagram schematically showing the configuration of the receiving device 2. As shown in FIG. 3, the receiving device 2 has a shape that can be worn by the subject 1, a receiving jacket 2a having receiving antennas A1 to An, and an external device that processes received radio signals and the like. 2b. Each of the receiving antennas A1 to An may not be provided in the receiving jacket 2a so as to be directly attached to the outer surface of the subject, and may be detachable from the receiving jacket 2a.

  The external device 2b has a function of processing a radio signal transmitted from the capsule endoscope 3. Specifically, as shown in FIG. 3, the external device 2b is connected to the selector switch SW for switching the connection of the receiving antennas A1 to An and the subsequent stage of the selector switch SW, and is connected by the selector switch SW. The receiving circuit 11 amplifies and demodulates the radio signals from the receiving antennas A1 to An, and a signal processing circuit 12 and a sample hold circuit 15 are connected to the subsequent stage of the receiving circuit 11. An A / D converter 16 is further connected to the subsequent stage of the sample hold circuit 15. The control unit C includes a selection control unit C1, and connects the signal processing circuit 12, the A / D conversion unit 16, the storage unit 13 corresponding to the portable storage medium 5, the display unit 14, and the switching control unit SC. The switching control unit SC has strength receiving antenna number information N1 and video receiving antenna number information N2. Based on these number information, the switching control unit SC issues a switching instruction of the changeover switch SW, and the sample hold circuit 15, A / D Instruct the processing timing of the conversion unit 16 and the selection control unit C1. The power supply unit 17 supplies power to each unit described above, and is realized by, for example, a battery.

  The change-over switch SW of the external device 2b selectively switches any one of the receiving antennas A1 to An based on the switching instruction from the switching control unit SC, and the radio signal from the switched receiving antennas A1 to An. Is output to the receiving circuit 11.

  As described above, the receiving circuit 11 amplifies the radio signal, outputs the demodulated video signal S1 to the signal processing circuit 12, and also receives the received intensity signal S2 that is the received electric field intensity of the amplified radio signal as the sample hold circuit 15. Output to. The video data processed by the signal processing circuit 12 is stored in the storage unit 13 by the control unit C and displayed and output by the display unit 14. The signal sampled and held by the sample and hold circuit 15 is converted into a digital signal by the A / D conversion unit 16 and taken into the control unit C, and the selection control unit C1 of the control unit C receives part of the synchronization period and the video signal. The receiving antenna that has received the largest received field strength among the received field strengths received during the horizontal blanking period within the period is selected as the receiving antenna for the video signal period, and reception other than the selected receiving antenna is received. Are sequentially selected as receiving antennas for a part of the synchronization period and a horizontal blanking period within the video signal period, and the respective receiving antenna numbers are designated as video receiving antenna number information N2, intensity receiving antenna number information N1 Signal S4 to be output to the switching control unit SC. In addition, the control unit C selects the reception electric field strength in the horizontal blanking period in a part of the synchronization period and the video signal period, and the reception electric field strength in the video reception period excluding at least the horizontal blanking period at that time. The image is stored in the storage unit 13 together with the video data in association with the receiving antenna. The stored received electric field strength of each receiving antenna becomes information for calculating the position of the capsule endoscope 3 in the body when the video data is received.

  The switching control unit SC holds the strength receiving antenna number information N1 and the video receiving antenna number information N2 instructed by the selection control unit C1, and the strength is used in a part of the synchronization period and the horizontal blanking period in the video signal period. The changeover switch SW is instructed to selectively connect the receiving antennas A1 to An corresponding to the receiving antenna number information N1, and at least the reception corresponding to the video receiving antenna number information N2 is received during the video receiving period excluding the horizontal blanking period. A signal S5 for instructing the changeover switch SW to selectively connect the antennas A1 to An is output to the changeover switch SW, and a signal S3a for instructing a sample hold timing by the sample hold circuit 15 and A by the A / D conversion unit 16 / D conversion timing signal S3b, selection control timing by selection control unit C1 And it outputs a signal S3c instructing grayed.

  Here, the signal processing circuit 12 will be described with reference to FIG. The signal processing circuit 12 performs a predetermined process on the in-vivo image data wirelessly transmitted from the capsule endoscope 3 and receives the intra-body cavity data in the storage unit 13 (portable recording device 5) through a compression process or the like. It has a function of storing image data. FIG. 4 is a block diagram schematically showing the configuration of the signal processing circuit 12.

  As shown in FIG. 4, the signal processing circuit 12 includes an output of the clock recovery 61, the S / P conversion unit 62, the synchronization detection unit 63, and the S / P conversion unit 62 to which the video signal S <b> 1 from the reception circuit 11 is input. The image generation unit 64, WB, ID position detection unit 65 connected to the output side, the frame memory 66 connected to the output side of the image generation unit 64, and the error connected to the output side of the WB, ID position detection unit 65 A correction unit 67 and an image processing unit 68 connected to the frame memory 66 and the error correction unit 67 and outputting a processing result to the control unit C side are provided.

  The clock recovery 61 has a PLL circuit and the like, reproduces a clock based on the video signal S1, and outputs the clock to the S / P converter 62, WB, ID position detector 65, and the like. The S / P converter 62 converts the baseband video signal S1 input as a serial signal into a parallel signal in synchronization with the clock. The synchronization detection unit 63 monitors the data of the input video signal S1. For example, when the code “55 00 FF 55” is detected, the synchronization detection unit 63 detects the pulse of the vertical synchronization signal VD as the image generation unit 64, WB, ID. Output to the position detector 65. Similarly, for example, when a code “55 AA FF 55” is detected, a pulse of the horizontal synchronization signal HD is output to the image generation unit 64. The image generation unit 64 performs image generation processing on the parallel-converted video signal at a timing synchronized with the vertical synchronization signal VD and the horizontal synchronization signal HD, generates frame image data, and temporarily stores the frame image data in the frame memory 66. .

  On the other hand, the WB / ID position detection unit 65 monitors the count value HCOUNT of the horizontal synchronization signal based on the vertical synchronization signal VD, and white balance coefficient data “WB” and capsule unique ID information “ID” are arranged. It is detected whether or not the count values HCOUNT “357” and “358” as positions have been reached. When the count values HCOUNT “357” and “358” are reached, the Reed-Solomon codes “RS1” and “RS2” immediately after 4 bytes of data are received. The error correction unit 67 uses the received 4-byte data to correct the white balance coefficient data “WB” and capsule unique ID information “ID” using Reed-Solomon codes “RS1” and “RS2”, respectively. Processing is performed, and the error-corrected correct white balance coefficient data “WB” and capsule unique ID information “ID” are output to the image processing unit 68. That is, in the first embodiment, after detecting the code “55 00 FF 55” indicating the vertical synchronization signal VD, the horizontal synchronization signal HCOUNT is counted, the white balance coefficient data “WB”, and the capsule unique ID information “ The position of “ID” is specified, and error correction is performed by the Reed-Solomon codes “RS1” and “RS2” added immediately thereafter.

  The image processing unit 68 uses the white balance coefficient data “WB” that has been corrected for the frame image data that has been generated and temporarily stored in the frame memory 66 to perform white balance processing, compression processing, and the like. Image processing is performed, and the image is stored in the storage unit 13 (portable recording medium 5) under the control of the control unit C. In such image processing, the image processing unit 68 checks the error-corrected capsule unique ID information “ID”, and if it does not match the capsule unique ID information “ID” of the previous frame, It is determined that the image data is transmitted from the endoscope 3, and the image data is not stored in the storage unit 13 (portable recording medium 5).

  As described above, in the first embodiment, the white balance coefficient information “WB” unique to the capsule endoscope 3 and the capsule unique ID information “ID” for determining the capsule endoscope 3 are used. The Reed-Solomon codes “RS1” and “RS2” are added and transmitted, and the receiving apparatus 2 uses the Reed-Solomon codes “RS1” and “RS2” to obtain white balance coefficient information “WB” and capsule unique ID information. Since the error correction of “ID” is performed, even if a bit error such as data corruption occurs in the white balance coefficient information “WB” or the capsule unique ID information “ID” information itself, the error correction process corrects the data. can do. In particular, according to the Reed-Solomon code, it is possible to correct even 1-byte data corruption, and the reliability is higher than that of a 1-bit corrected Hamming code. Therefore, it is possible to increase resistance to bit errors in parameter information such as white balance coefficient information “WB”, and it is possible to reduce video signals that are invalid in units of frames as much as possible. Also, error correction codes are added only to important parameter information such as white balance coefficient information “WB” and capsule unique ID information “ID”, and error correction codes are added to the video signals themselves that occupy the majority. Since there is no data redundancy, the data redundancy can be minimized.

(Embodiment 2)
In the radio signal transmission / reception operation between the capsule endoscope 3 and the receiving device 2, a code “55 00 FF 55” indicating a vertical synchronization signal VD having a 16-bit configuration and a code “55 AA” indicating a horizontal synchronization signal HD, respectively. As for FF 55 ″, if even one bit has a bit error, it cannot be synchronized correctly. In particular, the code “55 00 FF 55” indicating the vertical synchronization signal VD has a specific arrangement relationship with the arrangement position of the white balance coefficient information “WB” and the capsule unique ID information “ID”. If it cannot be detected, the arrangement position of the white balance coefficient information “WB” and the capsule unique ID information “ID” cannot be detected correctly. In addition, regarding the code “55 AA FF 55” indicating the horizontal synchronization signal HD, if it cannot be correctly detected due to a bit error, line synchronization cannot be reliably obtained for the video signal.

  Therefore, in the first embodiment, error correction codes are added only for important parameter information such as white balance coefficient information “WB” and capsule unique ID information “ID”. In the second embodiment, Further, an error correction code is added to the code “55 00 FF 55” indicating the vertical synchronization signal VD and the code “55 AA FF 55” indicating the horizontal synchronization signal HD.

  The parameter / error correction code adding unit 22a according to the second embodiment includes Reed-Solomon codes “RS3”, “RS4”, “RS5”, byte by byte as error correction code data stored in the parameter memory 28 in advance. “RS6” is added immediately after the code “55 00 FF 55” indicating the vertical synchronization signal VD transmitted and output in a predetermined arrangement relationship defined in advance and the code “55 AA FF 55” indicating the horizontal synchronization signal HD. .

  Referring to FIG. 7 showing a timing chart of the receiving operation of the receiving apparatus 2 of the second embodiment, the vertical synchronization signal VSYNC (VD) is “55 00 FF 55” as a code indicating the vertical synchronization signal VD. A specific line position where the bit value is used and the count value HCOUNT of the horizontal synchronization signal in the phase where the count value VCOUNT from the start of operation is “10” is defined by “350” “351” “352” “353” And the count value HCOUNT immediately after that is set to a specific line position defined by “354” and “355”, and Reed-Solomon codes “RS3” and “RS4 for error correction” are set. "Is assigned and is set to be transmitted.

  Similarly, the horizontal synchronization signal HSYNC (HV) is in a phase in which a 16-bit code “55 AA FF 55” is used as a code indicating the horizontal synchronization signal HD and the count value VCOUNT from the start of operation is “11”. The horizontal sync signal count value HCOUNT is assigned to a specific line position defined by “0”, “1”, “2”, and “3” and set to be transmitted and output, and the count value HCOUNT immediately after that is set. Is set so that Reed-Solomon codes “RS5” and “RS6” for error correction are assigned to specific line positions defined by “4” and “5” and transmitted.

  Here, the signal processing circuit 70 of the second embodiment will be described with reference to FIG. FIG. 6 is a block diagram schematically showing the configuration of the signal processing circuit 70. The signal processing circuit 70 includes a synchronous code position detection shift register 71, an error correction unit 72, and a code comparison unit 73 in addition to the configuration of the signal processing circuit 12 described above.

  The synchronization code position detection shift register 71 shifts the video signal S1 input according to the clock, and the count value VCOUNT “10”, the count value from which the code indicating the vertical synchronization signal VD should exist from the count values VCOUNT and HCOUNT. It is detected whether or not the HCOUNT “350” to “353” has been reached, and when it is reached, 6-byte data including the immediately following Reed-Solomon codes “RS3” and “RS4” is received. The error correction unit 72 uses the received 6-byte data to perform error correction processing on the code indicating the vertical synchronization signal VD using the Reed-Solomon codes “RS3” and “RS4”. The code comparison unit 73 compares and determines whether or not the code indicating the error-corrected vertical synchronization signal VD matches the code “55 00 FF 55” indicating the original vertical synchronization signal VD. The code comparison unit 73 outputs the pulse of the vertical synchronization signal VD to the image generation unit 64 and the WB / ID position detection unit 65 as described above, as detected correctly. As a result, even if there is a bit error in the code indicating the vertical synchronization signal VD, the correct vertical synchronization signal VD can be detected, and the arrangement position of the white balance coefficient information “WB” and the capsule unique ID information “ID” is also detected correctly. can do. The code comparison unit 73 also outputs a vertical synchronization signal VD to the synchronization code position detection shift register 71 to reset the counter.

  Further, the synchronization code position detection shift register 71 shifts the video signal S1 input in accordance with the clock, and the count value VCOUNT “11”, in which the code indicating the horizontal synchronization signal HD should exist from the count values VCOUNT and HCOUNT. It is detected whether or not the count value HCOUNT “0” to “3” has been reached. If it has reached, 6-byte data including the immediately following Reed-Solomon codes “RS5” and “RS6” is received. The error correction unit 72 uses the received 6-byte data to perform error correction processing on the code indicating the horizontal synchronization signal HD using Reed-Solomon codes “RS5” and “RS6”. The code comparison unit 73 compares and determines whether the error-corrected code indicating the horizontal synchronization signal HD matches the code “55 AA FF 55” indicating the original horizontal synchronization signal HD. The code comparison unit 73 outputs the pulse of the horizontal synchronization signal HD to the image generation unit 64 as described above, assuming that it is correctly detected. As a result, even if there is a bit error in the code indicating the horizontal synchronization signal HD, the correct horizontal synchronization signal HD can be detected, and line synchronization can be ensured. The code comparison unit 73 also outputs a horizontal synchronization signal HD to the synchronization code position detection shift register 71 to reset the counter.

1 is a schematic diagram illustrating an overall configuration of a wireless in-vivo information acquiring system according to Embodiment 1. FIG. 1 is a block diagram schematically showing a configuration of a capsule endoscope according to a first embodiment. 3 is a block diagram schematically showing a configuration of a receiving apparatus according to Embodiment 1. FIG. 1 is a block diagram schematically showing a configuration of a signal processing circuit according to a first embodiment. 3 is a timing chart illustrating a receiving operation of the receiving apparatus according to Embodiment 1. FIG. 6 is a block diagram schematically showing a configuration of a signal processing circuit according to a second embodiment. 6 is a timing chart illustrating a receiving operation of the receiving apparatus according to the second embodiment.

Explanation of symbols

2 Receiver 3 Capsule Endoscope 21 CCD
22 signal processing circuit 65 WB, ID position detection unit 67 error correction unit 68 image processing unit 71 synchronization code position detection shift register 72 error correction unit

Claims (11)

A radio signal transmitted from a moving transmission apparatus and having a frame structure having at least an information main body including an information main body based on a video signal and an additional section including information for synchronization and parameter information unique to the transmission apparatus Is received using an antenna,
A detection unit for detecting an arrangement position of the parameter information in which an arrangement position on a frame configuration to which an error correction code is added and transmitted immediately after the received radio signal is defined;
A parameter information error correction unit that performs error correction of the parameter information using an error correction code added immediately after the detected position of the parameter information;
An image processing unit that performs image processing on the video signal of the information main body using the parameter information that has been error-corrected;
A receiving apparatus comprising: An arrangement position of a code indicating a vertical synchronization signal having a specific arrangement relationship with the parameter information, in which an arrangement position on a frame structure is transmitted in advance after an error correction code is added from the received radio signal A vertical synchronization code position detection unit for detecting
An error correction unit for vertical synchronization that performs error correction of a code indicating the vertical synchronization signal using an error correction code added immediately after the arrangement position of the code indicating the detected vertical synchronization signal;
The receiving apparatus according to claim 1, further comprising: A horizontal synchronization code position detection unit that detects the arrangement position of a code indicating a horizontal synchronization signal in which an arrangement position on a frame configuration is transmitted immediately after an error correction code is added from a received radio signal. When,
A horizontal synchronization error correction unit that performs error correction of the code indicating the horizontal synchronization signal using an error correction code added immediately after the arrangement position of the code indicating the detected horizontal synchronization signal;
The receiving apparatus according to claim 1, further comprising:   The receiving apparatus according to claim 1, wherein the parameter information includes unique ID information for determining the transmitting apparatus.   The parameter information includes white balance coefficient data for performing white balance processing on image data of an image sensor for obtaining a video signal in the transmission device. The receiving device according to one.   The receiving apparatus according to claim 1, wherein the parameter information includes data indicating an address of a pixel defect of an image sensor for obtaining a video signal in the transmitting apparatus.   The receiving apparatus according to claim 1, wherein the error correction code is a Reed-Solomon code. A radio signal having a frame configuration having at least an information body including an information body based on a video signal obtained by imaging and an additional unit including information for synchronization and parameter information unique to the transmission device is transmitted, and an antenna is provided. A transmitting device for receiving by a receiving device,
A transmission apparatus comprising: a signal processing unit that outputs an error correction code added to a parameter information immediately after the parameter information whose transmission position is defined and transmitted in advance.   The signal processing unit applies the code indicating the vertical synchronization signal immediately after the code indicating the vertical synchronization signal to be transmitted and output with the arrangement position in the frame configuration specified in advance so as to have a specific arrangement relationship with the parameter information. 9. The transmission apparatus according to claim 8, wherein an error correction code is added and output.   The signal processing unit outputs an error correction code with respect to a code indicating the horizontal synchronization signal immediately after the code indicating the horizontal synchronization signal to be transmitted and output with the arrangement position on the frame configuration defined in advance. The transmission device according to claim 8 or 9. A transmitting apparatus for transmitting a radio signal having a frame structure, including at least an information main body including an information main body based on a video signal obtained by imaging and an additional section including information for synchronization and parameter information unique to the transmitting apparatus; A transmission / reception system comprising: a reception device that receives the wireless signal transmitted from the transmission device using an antenna;
The transmitter is
A signal processing unit for adding an error correction code to the parameter information and outputting the parameter information immediately after the parameter information to be transmitted with the arrangement position on the frame configuration defined in advance;
The receiving device is:
A detection unit for detecting an arrangement position of the parameter information from the received radio signal;
A parameter information error correction unit that performs error correction of the parameter information using an error correction code added immediately after the detected position of the parameter information;
An image processing unit that performs image processing on the video signal of the information main body using the parameter information that has been error-corrected;
A transmission / reception system comprising:

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