WO2015198659A1 - 撮像装置および内視鏡装置 - Google Patents
撮像装置および内視鏡装置 Download PDFInfo
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- WO2015198659A1 WO2015198659A1 PCT/JP2015/058379 JP2015058379W WO2015198659A1 WO 2015198659 A1 WO2015198659 A1 WO 2015198659A1 JP 2015058379 W JP2015058379 W JP 2015058379W WO 2015198659 A1 WO2015198659 A1 WO 2015198659A1
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- imaging
- synchronization signal
- communication
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- timing
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Definitions
- the present invention relates to an imaging apparatus and an endoscope apparatus provided with a plurality of imaging elements.
- an endoscope system is used to observe an organ of a subject such as a patient.
- An endoscope system is provided with an imaging device at a distal end, has an elongated shape having flexibility, and has an insertion portion to be inserted into a body cavity of a subject, and a cable on the proximal end side of the insertion portion And a processing device that performs in-vivo image processing according to the imaging signal generated by the imaging device and displays the in-vivo image on a display unit or the like.
- the endoscope system is equipped with a plurality of image sensors consisting of CMOS image sensors at the tip of the endoscope, and generates a three-dimensional image based on the image captured by each, or generates a clear two-dimensional image.
- CMOS image sensors consisting of CMOS image sensors at the tip of the endoscope
- the technique of doing is known (for example, refer patent document 1).
- an image sensor and a processing device are connected by a dedicated line (parallel bus) to transmit a signal.
- a timing generator generates a signal for driving a plurality of image sensors using a common clock, thereby synchronizing the plurality of image sensors.
- the communication control unit provided for each image sensor can communicate with a processing device, and the register setting of each image sensor is performed. Based on the timing at which this register setting is completed. Then, a synchronization signal is generated inside each image sensor, and each image sensor is driven based on the synchronization signal.
- each communication control unit that controls the serial bus counts the control timing based on the individual clock and controls the image sensor, if a time lag counted between the communication control units due to a clock deviation or the like occurs, In some cases, a shift occurs in the synchronization (drive timing) of the image sensor.
- the present invention has been made in view of the above, and an object of the present invention is to provide an imaging apparatus and an endoscope apparatus that can synchronize with high accuracy between a plurality of imaging elements.
- an imaging apparatus includes first and second imaging elements that photoelectrically convert light received by each to generate an electrical signal (imaging signal); A first communication control unit that is communicably connected to the first image pickup device and controls the operation of the first image pickup device by controlling the communication, and a first reference that is an operation reference of the first communication control unit A first clock generation unit that generates a clock signal, a second communication control unit that is communicably connected to the second image sensor and controls the operation of the second image sensor by controlling the communication; A second clock generation unit that generates a second clock signal that serves as an operation reference for the two communication control units, a reference synchronization signal generation unit that generates a reference synchronization signal, and imaging timings of the first and second image sensors; Imaging synchronization signal that triggers And an imaging synchronization signal generation unit that outputs the imaging synchronization signal to the first and second communication control units at a timing that is a predetermined elapsed time from a reference timing based on
- the imaging apparatus further includes a third clock generation unit that generates a third clock signal having a higher frequency accuracy than the first and second clock signals in the above-described invention, and a reference synchronization signal
- the generation unit generates a reference synchronization signal based on the third clock signal.
- the imaging apparatus further includes a synchronization signal extraction unit that extracts a horizontal synchronization signal from the electrical signals generated by the first and second imaging elements in the above invention, and the imaging synchronization signal generation unit includes:
- the timing at which the synchronization control communication between the first and second imaging elements and the first and second communication control units is completed is located between the same horizontal synchronization pulses and does not overlap with the horizontal synchronization pulses. It is characterized in that an imaging synchronization signal as a timing is generated.
- the input timing of the imaging synchronization signal is shorter than a period from when the first and second communication control units start communication for synchronization control to completion. It is characterized by that.
- each received light is photoelectrically converted to an electrical signal (imaging signal).
- a first communication control unit that is communicably connected to the first image sensor, and controls the operation of the first image sensor by controlling the communication
- a first clock generation unit that generates a first clock signal that serves as an operation reference of the first communication control unit is connected to the second image sensor so as to be communicable, and the communication is controlled to control the communication of the second image sensor
- a second communication control unit that controls the operation, a second clock generation unit that generates a second clock signal that is an operation reference of the second communication control unit, a reference synchronization signal generation unit that generates a reference synchronization signal
- Imaging of the first and second imaging elements An imaging synchronization signal serving as a trigger for determining imming is generated, and the imaging synchronization signal is output to the first and second communication control units at a timing that is
- the imaging timing of the first and second imaging elements is determined using the output imaging synchronization signal as a trigger.
- FIG. 1 is a diagram illustrating a schematic configuration of an endoscope system according to the first embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a schematic configuration of the endoscope system according to the first embodiment of the present invention.
- FIG. 3 is a timing chart illustrating the control timing of the endoscope system according to the first embodiment of the present invention.
- FIG. 4 is a timing chart for explaining the control timing of the endoscope system according to the first embodiment of the present invention, and is a timing chart showing a part of FIG. 3 in more detail.
- FIG. 5 is a block diagram illustrating a schematic configuration of the endoscope system according to the second embodiment of the present invention.
- FIG. 6 is a timing chart for explaining the control timing of the endoscope system according to the second embodiment of the present invention.
- FIG. 1 is a diagram illustrating a schematic configuration of an endoscope system according to the first embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a schematic configuration of the endoscope system according to the first embodiment.
- An endoscope system 1 shown in FIGS. 1 and 2 includes an endoscope 2 that captures an in-vivo image of a subject by inserting a distal end portion into the body cavity of the subject, and an in-vivo image captured by the endoscope 2.
- a processing device 3 that performs predetermined image processing and comprehensively controls the operation of the entire endoscope system 1, a light source device 4 that generates illumination light emitted from the distal end of the endoscope 2, and the processing device 3.
- the endoscope 2 includes an insertion portion 21 having an elongated shape having flexibility, an operation portion 22 that is connected to a proximal end side of the insertion portion 21 and receives input of various operation signals, and an insertion portion from the operation portion 22.
- 21 includes a universal cord 23 that extends in a direction different from the direction in which 21 extends, has connector portions 23a and 23b that are respectively connected to the processing device 3 and the light source device 4, and incorporates various cables.
- the insertion portion 21 receives a light and performs photoelectric conversion to generate a signal to generate a signal.
- the insertion portion 21 has a built-in image pickup element in which two-dimensionally arranged pixels, and a plurality of bending pieces. It has a bending portion 25 and a long flexible tube portion 26 that is connected to the proximal end side of the bending portion 25 and has flexibility.
- the front end portion 24 includes a light guide 241, an illumination lens 242, two optical systems (optical systems 243A and 243B), a first image sensor 244A, and a second image sensor 244B.
- the light guide 241 is configured using glass fiber or the like, and serves as a light guide path for light emitted from the light source device 4.
- the illumination lens 242 is provided at the tip of the light guide 241 and is a lens for emitting illumination light to the outside.
- the optical systems 243A and 243B are condensing optical systems and are each configured by using one or a plurality of lenses.
- the optical systems 243A and 243B may have an optical zoom function for changing the angle of view and a focus function for changing the focus.
- the first image sensor 244A and the second image sensor 244B include a sensor unit 244a that photoelectrically converts light collected by the optical systems 243A and 243B and generates an electrical signal (hereinafter referred to as an image signal), and a sensor unit 244a.
- An analog front end unit 244b (hereinafter referred to as “AFE unit 244b”) that performs noise removal and A / D conversion on the output imaging signal and parallel / serial conversion of the imaging signal (digital signal) output by the AFE unit 244b And a timing generator 244d for generating pulses of various signal processing in the AFE unit 244b and the P / S conversion unit 244c, a P / S conversion unit 244c that transmits to the outside (processing device 3), a drive timing of the sensor unit 244a, An imaging control unit 244 that controls the operation of the first imaging device 244A or the second imaging device 244B. With and, respectively.
- the first image sensor 244A and the second image sensor 244B are each implemented using a CMOS (Complementary Metal Oxide Semiconductor) image sensor.
- CMOS Complementary Metal Oxide Semiconductor
- a plurality of pixels each having a photodiode for accumulating charges according to the amount of light and a capacitor for converting charges transferred from the photodiodes to voltage levels are arranged in a matrix, and each pixel is an optical system.
- a light receiving unit 244f that photoelectrically converts light from 243 to generate an electric signal, and an electric signal generated by a pixel arbitrarily set as a reading target among a plurality of pixels of the light receiving unit 244f are sequentially read out as an imaging signal And a reading unit 244g for outputting.
- the light receiving unit 244f is provided with a color filter on the light receiving surface.
- the readout unit 244g sequentially reads out the electrical signals generated by a plurality of pixels arranged in a matrix for each horizontal line.
- the AFE unit 244b adjusts the gain (gain) of the noise reduction circuit that reduces the noise component included in the analog imaging signal and the imaging signal (electrical signal) using, for example, a correlated double sampling method.
- an AGC (Automatic Gain Control) circuit that maintains a constant output level and an A / D conversion circuit that performs A / D conversion on the imaging signal output through the AGC circuit are included.
- the imaging control unit 244e controls various operations of the first imaging element 244A or the second imaging element 244B in accordance with the received setting data and control signals for synchronization control. For example, the imaging control unit 244e outputs a readout signal to the readout unit 244g, and controls an output mode of an electrical signal output from each pixel in units of pixels.
- the imaging control unit 244e is configured using a CPU (Central Processing Unit), a register that records various programs, and the like.
- the operation section 22 includes a bending knob 221 that bends the bending section 25 in the vertical direction and the left-right direction, a treatment instrument insertion section 222 that inserts a treatment instrument such as a biological forceps, an electric knife, and a test probe into the body cavity of the subject.
- a treatment instrument such as a biological forceps, an electric knife, and a test probe into the body cavity of the subject.
- switches 223 that are operation input units for inputting operation instruction signals of peripheral devices such as air supply means, water supply means, and screen display control.
- the treatment tool inserted from the treatment tool insertion portion 222 is exposed from the opening (not shown) via the treatment tool channel (not shown) of the distal end portion 24.
- the operation unit 22 includes a first communication control unit 224, a second communication control unit 225, a first clock generation unit 226, and a second clock generation unit 227.
- the first communication control unit 224 controls the drive timing of the first image sensor 244A based on the setting data received from the processing device 3 and a control signal related to synchronization control.
- the second communication control unit 225 controls the drive timing of the second image sensor 244B based on the setting data received from the processing device 3 and a control signal related to synchronization control.
- the first clock generation unit 226 generates a clock signal (first clock signal) for driving the first communication control unit 224.
- the second clock generation unit 227 generates a clock signal (second clock signal) for driving the second communication control unit 225.
- the first clock generation unit 226 may be built in the first communication control unit 224, and the second clock generation unit 227 may be built in the second communication control unit 225.
- a microcomputer incorporating a clock generation circuit is used for the first communication control unit and the second communication control unit.
- the universal cord 23 includes at least a light guide 241 and a collective cable 245 in which one or a plurality of signal lines are collected.
- the collective cable 245 includes a signal line for transmitting / receiving setting data and a signal line for transmitting / receiving an imaging signal.
- the processing device 3 includes a first S / P converter 301A, a second S / P converter 301B, an image processor 302, a brightness detector 303, a dimmer 304, a drive signal generator 305, and an input Unit 306, storage unit 307, control unit 308, and reference clock generation unit 309 (third clock generation unit).
- the first S / P conversion unit 301A and the second S / P conversion unit 301B perform serial / parallel conversion on imaging signals (digital signals) received from the distal end portion 24 (first imaging element 244A and second imaging element 244B), respectively.
- the image is output to the image processing unit 302.
- the image processing unit 302 generates an image signal to be displayed on the display device 5 based on the imaging signal input from the first S / P conversion unit 301A and the second S / P conversion unit 301B.
- the image processing unit 302 performs predetermined image processing on the imaging signal to generate an image signal including an in-vivo image for display.
- image processing synchronization processing, optical black subtraction processing, white balance adjustment processing, color matrix calculation processing, gamma correction processing, color reproduction processing, edge enhancement processing, composition processing and format for combining a plurality of image data Conversion processing etc. are mentioned.
- the image processing unit 302 generates an image signal including a three-dimensional image or a high-dimensional two-dimensional image based on the imaging signals generated by the first imaging element 244A and the second imaging element 244B, respectively. Further, the image processing unit 302 outputs the imaging signals input from the first S / P conversion unit 301A and the second S / P conversion unit 301B to the control unit 308 or the brightness detection unit 303.
- the brightness detection unit 303 detects a brightness level corresponding to each pixel from the RGB component image signal output from the image processing unit 302, and records the detected brightness level in a memory provided therein. Output to the control unit 308. In addition, the brightness detection unit 303 calculates a gain adjustment value and a light irradiation amount based on the detected brightness level, and outputs the calculated gain adjustment value to the image processing unit 302, while adjusting the light irradiation amount. Output to the light unit 304.
- the light control unit 304 sets the light amount generated by the light source device 4, the light emission timing, and the like based on the light irradiation amount calculated by the brightness detection unit 303.
- the control signal containing is transmitted to the light source device 4.
- the drive signal generation unit 305 generates a drive synchronization signal for driving the first image sensor 244A and the second image sensor 244B, and transmits it to the first communication control unit 224 and the second communication control unit 225.
- the drive signal generation unit 305 includes a reference synchronization signal generation unit 305a and an imaging synchronization signal generation unit 305b.
- the reference synchronization signal generation unit 305a generates a synchronization signal based on the clock signal generated by the reference clock generation unit 309.
- the synchronization signal generated by the reference synchronization signal generation unit 305 a includes a reference synchronization signal that serves as a reference for the operation of each unit of the processing device 3 and the operation of the endoscope 2 and the light source device 4.
- the imaging synchronization signal generation unit 305b generates an imaging synchronization signal for driving the first imaging element 244A and the second imaging element 244B based on the clock signal generated by the reference clock generation unit 309, and performs first communication control. Output to the unit 224 and the second communication control unit 225. Specifically, in the imaging synchronization signal generation unit 305b, the first imaging element 244A and the second imaging element 244B perform the imaging operation at a timing according to the processing time in the first communication control unit 224 and the second communication control unit 225. An imaging synchronization signal serving as a trigger for determining the imaging timing for starting the image is output.
- the imaging timing refers to the start timing of an imaging operation that reads and acquires an electrical signal for one frame constituting one image.
- the input unit 306 receives input of various signals such as an operation instruction signal for instructing the operation of the endoscope system 1.
- the storage unit 307 is realized using a semiconductor memory such as a flash memory or a DRAM (Dynamic Random Access Memory).
- the storage unit 307 stores various programs for operating the endoscope system 1 and data including various parameters necessary for the operation of the endoscope system 1.
- the control unit 308 is configured using a CPU or the like, and performs drive control of each component including the tip 24 and the light source device 4, input / output control of information with respect to each component, and the like.
- the control unit 308 transmits setting data for imaging control to the imaging control unit 244e via a predetermined signal line included in the collective cable 245.
- the setting data includes the imaging speed (frame rate) of the imaging device 244, the setting of the electronic shutter and gain, the instruction information that instructs the reading speed of pixel information from any pixel of the sensor unit 244a, and the AFE unit 244b. Includes transmission control information of the pixel information read out.
- the reference clock generation unit 309 generates a clock signal (third clock) that serves as a reference for the operation of each component of the endoscope system 1, and generates the clock signal for each component of the endoscope system 1. Supply.
- the clock signal generated by the reference clock generation unit 309 is more accurate than the clock signals generated by the first clock generation unit 226 and the second clock generation unit 227, respectively.
- the reference clock generation unit 309 has a higher frequency accuracy of the oscillator than the frequency accuracy of the oscillators of the first clock generation unit 226 and the second clock generation unit 227.
- the light source device 4 includes a white light source 41, a light source control unit 42, and an LED (Light Emitting Diode) driver 43.
- the white light source 41 includes a white LED, and generates white illumination light under the control of the light source control unit 42.
- the light source control unit 42 controls the amount of current supplied to the white light source 41 according to the control signal transmitted from the dimming unit 304.
- the LED driver 43 causes the white light source 41 to generate illumination light by supplying current to the white light source 41 under the control of the light source control unit 42.
- the light generated by the white light source 41 is irradiated to the outside from the tip of the tip portion 24 via the light guide 241.
- a special light source that generates excitation light for exciting the fluorescent substance introduced into the subject may be provided.
- the special light source generates infrared light, for example.
- light with a wavelength band different from that of white illumination light and light of one of the red, green, and blue color components narrowed by a narrow-band bandpass filter is generated as special light. May be.
- the special light include NBI (Narrow Band Imaging) illumination light of two types of bands, blue light and green light, which are narrowed so as to be easily absorbed by hemoglobin in blood.
- the display device 5 has a function of receiving and displaying the in-vivo image generated by the processing device 3 via the video cable.
- the display device 5 has a display such as liquid crystal or organic EL (Electro Luminescence).
- An imaging device is configured using the synchronization signal generation unit 305a and the imaging synchronization signal generation unit 305b.
- FIG. 3 is a timing chart illustrating the control timing of the endoscope system according to the first embodiment.
- FIG. 4 is a timing chart for explaining the control timing of the endoscope system according to the first embodiment, and is a timing chart showing a part of FIG. 3 in more detail.
- the first image pickup device 244A and the second image pickup device 244B read the electrical signals of the first to nth lines (one frame) at different timings for each horizontal line by the exposure of the light receiving unit 244f and the reading unit 244g. By repeating alternately, an imaging signal including the in-vivo image of the subject is acquired.
- a period required for the exposure processing of the first imaging device 244A and the second imaging device 244B and the readout processing of the electric signal generated by the exposure processing is referred to as a field.
- a field for example, an exposure process and a reading process for acquiring an electric signal (imaging signal) of one frame constituting one image are performed.
- the field shifts from the field 1 to the field 2 by the internal synchronization timing (reference synchronization signal).
- the reference timing based on this synchronization timing (reference synchronization signal) may differ from the timing at which the image sensor reading process is desired to start. Therefore, the control unit 308 transmits the synchronization signal generated by the imaging synchronization signal generation unit 305b to the first communication control unit 224 and the second communication control unit 225, respectively.
- the first communication control unit 224 and the second communication control unit 225 include setting (register setting) of operating conditions of the first image sensor 244A and the second image sensor 244B using the reference synchronization signal from the drive signal generator 305 as a trigger. Then, synchronization control communication for determining the imaging timing (vertical synchronization timing) is started. At this time, the first communication control unit 224 starts synchronization control communication after counting a predetermined time based on the clock signal generated by the first clock generation unit 226 from the synchronization timing. Also, the second communication control unit 225 starts communication for synchronization control after counting for a predetermined time based on the clock signal generated by the second clock generation unit 227 from this synchronization timing.
- setting data is transmitted from the control unit 308 according to a known communication standard such as I 2 C or SPI, and various settings relating to each image sensor (electronic shutter brightness control setting, device designation, address designation, etc.) ) Is performed.
- a known communication standard such as I 2 C or SPI
- the imaging synchronization signal generated by the imaging synchronization signal generation unit 305b is transmitted to the endoscope 2 (the first communication control unit 224 and the second communication control unit 225).
- the imaging synchronization signal transmitted by the imaging synchronization signal generation unit 305b is a signal that serves as a trigger for controlling the completion of the synchronization control communication in the synchronization control communication, and includes the first communication control unit 224 and the second communication. It is a signal for determining the final communication of the synchronous control of the control unit 225.
- the imaging synchronization signal generation unit 305b performs the second communication control based on the elapsed time from the synchronization timing of the processing device 3 to the final communication timing of the synchronization control of the first communication control unit 224 and the synchronization timing of the processing device 3.
- the first communication control unit 224 and the second communication control unit 225 each perform final communication using the reception of the imaging synchronization signal as a trigger.
- the imaging synchronization signal generation unit 305b outputs an imaging synchronization signal after counting a predetermined elapsed time from the reference timing based on the synchronization timing (reference synchronization signal).
- the reference timing may be any timing such as the timing at which the first communication control unit 224 or the second communication control unit 225 starts the synchronization control communication in addition to the timing at which the reference synchronization signal is output.
- the count number (elapsed time) performed by the imaging synchronization signal generation unit 305b may be determined by counting the elapsed time in the communication of the synchronization control performed before the previous time. Communication may be performed at the time of startup or the like, and may be determined by counting elapsed time.
- the first communication control unit 224 performs synchronization control communication based on the synchronization timing of the processing device 3, and waits for communication immediately before the final communication of the synchronization control.
- the second communication control unit 225 performs synchronization control communication based on the timing counted by the clock generated by the second clock generation unit 227, and waits for communication immediately before the final communication of the synchronization control. There is a slight error in the frequency of the clock generated by the first clock generation unit 226 and the second clock generation unit 227. In FIG. 4, even if the communication start is simultaneous, the second communication control unit 255 Since a time difference in counting with the communication control unit 224 occurs, communication with the first communication control unit 224 is performed at a delayed timing.
- the first communication control unit 224 and the second communication control unit 225 perform final communication for synchronization control using the imaging synchronization signal from the imaging synchronization signal generation unit 305b as a trigger.
- the first communication control unit 224 uses the imaging synchronization signal from the imaging synchronization signal generation unit 305b as shown in FIG. Generate a downstream clock. Further, the second communication control unit 225 generates a falling clock using the imaging synchronization signal as a trigger. By generating the falling clock, the vertical synchronization timing (imaging timing) of the first imaging element 244A and the second imaging element 244B is determined, and the field is switched. When the field is switched, the reading process by the reading unit 244g is started.
- the first communication control unit 224 and the second communication control unit 225 perform the final communication of the synchronization control by using the imaging synchronization signal counted by the reference clock as a trigger, so that the first communication control unit 224 and the second communication control unit 224 perform the second communication. Since the communication completion timings of the synchronization control of the communication control unit 225 are substantially the same, even if there is a difference in the time counted by the first communication control unit 224 and the second communication control unit 225, the first communication control unit 224 and the first communication control unit 225 2 The synchronization of the communication control unit 225 can be controlled with high accuracy.
- the input timing of the imaging synchronization signal is shorter than the period from when the first communication control unit 224 and the second communication control unit 225 start synchronization control communication to completion, that is, the imaging synchronization signal is communicated. It is preferably output after the start.
- the first communication control unit 224 and the second communication control unit 225 perform the final communication of the synchronization control using the imaging synchronization signal as a trigger, so that the first imaging element 244A and the second imaging device 244A and second Since the vertical synchronization timing (imaging timing) of the image sensor 244B is determined, synchronization between the plurality of image sensors can be achieved with high accuracy.
- the first communication control unit 224 counts for a predetermined time based on the clock generated by the first clock generation unit 226, and starts communication for synchronization control of the first image sensor 244A.
- the 1st communication control part 224 may start communication at the communication start timing (not shown) transmitted from the control part 308, for example. In this case, the number of control lines increases, but the communication start timing can be controlled with high accuracy.
- the synchronization control communication by the first communication control unit 224 and the second communication control unit 225 has been described as being performed every field, but may be performed every several fields. It may be performed in a predetermined field.
- the field is switched at the falling edge of the final pulse.
- the field may be switched several clocks after the falling edge of the final pulse.
- final communication is performed using the imaging synchronization signal as a trigger.
- the falling clock may be generated immediately after the imaging synchronization signal is received, or the falling clock is generated after counting several clocks. May be. What is necessary is just to control the timing of the final communication with the reception of the imaging synchronization signal as a trigger.
- the processing device 3 is described as including the imaging synchronization signal generation unit 305b.
- the count unit may be provided on the endoscope 2 side such as the connector unit 23a. In this case, it is preferable to provide a clock generation unit corresponding to the reference clock generation unit 309 on the endoscope 2 side.
- FIG. 5 is a block diagram illustrating a schematic configuration of the endoscope system according to the second embodiment.
- symbol is attached
- a horizontal synchronization signal is extracted from the obtained imaging signal, a vertical synchronization timing is determined according to the horizontal synchronization timing of the first imaging element 244A and the second imaging element 244B, and field switching control is performed. I do.
- the endoscope system 1a includes the endoscope 2, the light source device 4, the display device 5, and the processing device 3a described above.
- the processing device 3a includes a first synchronization signal extraction unit 310A and a second synchronization signal extraction unit 310B in addition to the configuration of the processing device 3 described above.
- the vertical synchronization timing of the first image sensor 244A and the second image sensor 244B will be described as being controlled in units of horizontal synchronization timing. Specifically, by setting the register of each image sensor, after this register setting is completed, a synchronization signal is generated inside each image sensor based on the first horizontal synchronization timing. The image sensor is driven.
- the drive timing of each image sensor is 1 horizontal synchronization. Differences in time occur.
- the imaging device is configured using the generation unit 305a, the imaging synchronization signal generation unit 305b, and the synchronization signal extraction unit (the first synchronization signal extraction unit 310A and the second synchronization signal extraction unit 310B).
- First synchronization signal extraction unit 310A and second synchronization signal extraction unit 310B first acquire imaging signals generated by endoscope 2 via first S / P conversion unit 301A and second S / P conversion unit 301B, respectively. To do.
- the first synchronization signal extraction unit 310A and the second synchronization signal extraction unit 310B separate the image signal and the synchronization signal from the acquired imaging signal, and respectively extract the horizontal synchronization signal.
- the imaging synchronization signal generation unit 305b generates an imaging synchronization signal based on the interval between adjacent pulses of each horizontal synchronization signal extracted by the first synchronization signal extraction unit 310A and the second synchronization signal extraction unit 310B. Specifically, the imaging synchronization signal generation unit 305b outputs the imaging synchronization signal output so that the communication end timings of the first communication control unit 224 and the second communication control unit 225 are located between the same pulses. Generate.
- the imaging synchronization signal according to the second embodiment is a signal that serves as a trigger for performing communication completion control of synchronization control. Specifically, the final communication is performed using the reception of the imaging synchronization signal as a trigger. Signal.
- FIG. 6 is a timing chart for explaining the control timing of the endoscope system according to the second embodiment.
- the first communication control unit 224 and the second communication control unit 225 start the communication of the synchronization control based on the count of its own clock similarly to the first embodiment described above, or the synchronization control based on the synchronization timing of the processing device 3 Start communication.
- the first communication control unit 224 and the second communication control unit 225 respectively perform synchronization control using the imaging synchronization signal as a trigger. Communication for synchronous control is performed by waiting for several clocks of communication. Specifically, as shown in FIG. 6, each of the first communication control unit 224 and the second communication control unit 225 uses the imaging synchronization signal from the imaging synchronization signal generation unit 305b before performing the final communication. Wait for communication for the set number of clocks, and delay the communication completion timing.
- the first communication control unit 224 and the second communication control unit 225 that are waiting for communication immediately before the final communication of the synchronization control with the imaging synchronization signal as a trigger perform the final communication and complete the communication. May be.
- the communication completion timing of the first image sensor 244A and the second image sensor 244B is located between the same pulses (for example, nH in FIG. 6) of the horizontal synchronization signal and does not overlap (do not match) with the horizontal synchronization pulse.
- the horizontal synchronization timing for adjusting the vertical synchronization timing of the first image sensor 244A and the second image sensor 244B is adjusted so as to coincide with the timing.
- the vertical synchronization timings of the first image sensor 244A and the second image sensor 244B are also matched, and the field can be switched at the matched vertical synchronization timing.
- the reading process by the reading unit 244g is started.
- the first communication control unit 224 and the second communication control are triggered by the imaging synchronization signal. Even if the counts of the first communication control unit 224 and the second communication control unit 225 are shifted by adjusting the completion timing of the synchronization control by the unit 225, the first communication control unit 224 and the second communication control unit 225 Synchronization can be controlled with high accuracy.
- the first communication control unit 224 and the second communication control unit 225 each count a predetermined number of clocks using the imaging synchronization signal as a trigger to adjust the completion of the synchronization control. Since the horizontal synchronization timing is matched and the same vertical synchronization timing is aligned, synchronization can be achieved between a plurality of image sensors with high accuracy.
- the processing device 3 has been described as including the imaging synchronization signal generation unit 305b, the first synchronization signal extraction unit 310A, and the second synchronization signal extraction unit 310B.
- the part may be provided on the endoscope 2 side such as the connector part 23a. In this case, it is preferable to provide a clock generation unit corresponding to the reference clock generation unit 309 on the endoscope 2 side.
- the first synchronization signal extraction unit 310A and the second synchronization signal extraction unit 310B acquire an imaging signal from the AFE unit 244b or the P / S conversion unit 244c, and extract a horizontal synchronization signal.
- Embodiment 2 described above if the completion timings of the synchronization control of the first communication control unit 224 and the second communication control unit 225 are located between pulses of the same horizontal synchronization signal, the synchronization signal is completed. The timing may be shifted.
- the vertical synchronization timing is determined based on the completion timing of control communication (or immediately following horizontal synchronization timing).
- the present invention is not limited to the completion timing of control communication. Any of these may be set as timing data for determining the vertical synchronization timing.
- the imaging synchronization signal is transmitted so that the setting data has the above-described timing (for example, between horizontal synchronization pulses).
- a plurality of filters that are arranged on the optical path of white light emitted from the white light source 41 and rotate to transmit only light in a predetermined wavelength band of the white light are rotated.
- the rotary filter By providing the rotary filter, light having the wavelength bands of red light (R), green light (G), and blue light (B) is sequentially transmitted and emitted.
- the white light (W illumination) emitted from the white light source 41 the narrow band red light (R illumination), green light (G illumination) and blue light (B illumination) are internally viewed.
- the mirror 2 can be sequentially emitted (surface sequential method). Even in this case, the color shift between images can be reduced by performing the above-described imaging control.
- the clock signal generated by the reference clock generation unit 309 is a reference synchronization signal (synchronization timing) for causing the first imaging element 244A and the second imaging element 244B to start an imaging operation.
- it may be generated based on a clock signal generated by the first clock generator 226, the second clock generator 227, or an external clock generator.
- Embodiment 1 and 2 mentioned above demonstrated as what controls the synchronization between two image sensors, even if it is a case where three or more image sensors are provided, imaging can be controlled similarly. it can.
- the imaging apparatus and the endoscope apparatus according to the present invention are useful for highly accurate synchronization among a plurality of imaging elements.
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Abstract
Description
図1は、本発明の実施の形態1にかかる内視鏡システムの概略構成を示す図である。図2は、本実施の形態1にかかる内視鏡システムの概略構成を示すブロック図である。
次に、本発明の実施の形態2について説明する。図5は、本実施の形態2にかかる内視鏡システムの概略構成を示すブロック図である。なお、上述した構成と同一の構成には同一の符号を付して説明する。本実施の形態2では、得られた撮像信号から水平同期信号を抽出して、第1撮像素子244Aおよび第2撮像素子244Bの水平同期タイミングに応じて垂直同期タイミングを決定し、フィールドの切り替え制御を行う。
2 内視鏡
3,3a 処理装置
4 光源装置
5 表示装置
21 挿入部
22 操作部
23 ユニバーサルコード
24 先端部
25 湾曲部
26 可撓管部
41 白色光光源
42 光源制御部
43 LEDドライバ
221 湾曲ノブ
222 処置具挿入部
223 スイッチ
224 第1通信制御部
225 第2通信制御部
226 第1クロック生成部
227 第2クロック生成部
241 ライトガイド
242 照明レンズ
243A,243B 光学系
244A 第1撮像素子
244B 第2撮像素子
244a センサ部
244b アナログフロントエンド部(AFE部)
244c P/S変換部
244d タイミングジェネレータ
244e 撮像制御部
244f 受光部
244g 読み出し部
301A 第1S/P変換部
301B 第2S/P変換部
302 画像処理部
304 調光部
305 駆動信号生成部
305a 基準同期信号生成部
305b 撮像同期信号生成部
306 入力部
307 記憶部
308 制御部
309 基準クロック生成部
310A 第1同期信号抽出部
310B 第2同期信号抽出部
Claims (5)
- 各々が受光した光を光電変換して電気信号を生成する第1および第2撮像素子と、
前記第1撮像素子と通信可能に接続し、該通信を制御することで前記第1撮像素子の動作を制御する第1通信制御部と、
前記第1通信制御部の動作基準となる第1のクロック信号を生成する第1クロック生成部と、
前記第2撮像素子と通信可能に接続し、該通信を制御することで前記第2撮像素子の動作を制御する第2通信制御部と、
前記第2通信制御部の動作基準となる第2のクロック信号を生成する第2クロック生成部と、
基準同期信号を生成する基準同期信号生成部と、
前記第1および第2撮像素子の撮像タイミングを決定するためのトリガとなる撮像同期信号を生成し、前記基準同期信号に基づく基準タイミングから所定の経過時間となるタイミングで前記第1および第2通信制御部に該撮像同期信号を出力する撮像同期信号生成部と、
を備え、
前記第1および第2通信制御部は、前記第1および第2撮像素子の撮像タイミングを同期する同期制御の通信を行う際、前記撮像同期信号生成部から出力される前記撮像同期信号をトリガとして、前記第1および第2撮像素子の撮像タイミングを決定することを特徴とする撮像装置。 - 前記第1および第2のクロック信号と比して周波数精度が高い第3のクロック信号を生成する第3クロック生成部を備え、
基準同期信号生成部は、前記第3のクロック信号に基づいて基準同期信号を生成することを特徴とする請求項1に記載の撮像装置。 - 前記第1および第2撮像素子が生成した電気信号から水平同期信号を抽出する同期信号抽出部をさらに備え、
前記撮像同期信号生成部は、第1および第2撮像素子と前記第1および第2通信制御部との間の前記同期制御の通信が完了するタイミングが互いに同一の水平同期パルス間に位置し、かつ該水平同期パルスと重複しないタイミングとなる撮像同期信号を生成することを特徴とする請求項1に記載の撮像装置。 - 前記撮像同期信号の入力タイミングは、前記第1および第2通信制御部が同期制御の通信を開始してから完了するまでの期間よりも短いことを特徴とする請求項1に記載の撮像装置。
- 細長形状をなして生体内に挿入される挿入部を有する内視鏡装置において、
各々が受光した光を光電変換して電気信号を生成する第1および第2撮像素子と、
前記第1撮像素子と通信可能に接続し、該通信を制御することで前記第1撮像素子の動作を制御する第1通信制御部と、
前記第1通信制御部の動作基準となる第1のクロック信号を生成する第1クロック生成部と、
前記第2撮像素子と通信可能に接続し、該通信を制御することで前記第2撮像素子の動作を制御する第2通信制御部と、
前記第2通信制御部の動作基準となる第2のクロック信号を生成する第2クロック生成部と、
基準同期信号を生成する基準同期信号生成部と、
前記第1および第2撮像素子の撮像タイミングを決定するためのトリガとなる撮像同期信号を生成し、前記基準同期信号に基づく基準タイミングから所定の経過時間となるタイミングで該撮像同期信号を前記第1および第2通信制御部に出力する撮像同期信号生成部と、
を備え、
前記第1および第2通信制御部は、前記第1および第2撮像素子の撮像タイミングを同期する同期制御の通信を行う際、前記撮像同期信号生成部から出力される前記撮像同期信号をトリガとして、前記第1および第2撮像素子の撮像タイミングを決定することを特徴とする内視鏡装置。
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EP15811552.7A EP3158916A4 (en) | 2014-06-23 | 2015-03-19 | Image pickup device and endoscopic device |
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