JP2011183055A - Endoscope processor, and endoscope unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate delay in image brightness adjustment to delay in exposure time adjustment. <P>SOLUTION: The endoscope processor 20 includes a processor image processing circuit 22, a multiplier 23, and a system controller 24. The processor image processing circuit 22 receives an image signal produced by imaging from an endoscope image processing circuit 33. The processor image processing circuit 22 calculates brightness based on the image signal. The system controller 24 determines exposure time based on the brightness and ideal brightness. The system controller 24 receives delay time till actual imaging with the determined exposure time from an endoscope memory 32. The system controller 24 calculates a correction gain based on the determined exposure time and the delay time. The multiplier 23 multiplies the image signal by the correction gain. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an endoscope processor that displays an image with stable brightness during endoscopic observation.

  An endoscope unit having an electronic endoscope is used to observe an internal structure that is not irradiated with light. In the endoscope unit, the illumination light is emitted from the light source, and the illumination light is transmitted to the observation region by the glass fiber, so that the observation region is irradiated with the illumination light. Further, the optical image of the reflected light with respect to the illumination light is exposed by the image sensor, and an image signal corresponding to the optical image is generated. Based on the generated image signal, an optical image of the observation region is displayed on the monitor and can be observed.

  In such subject observation by the endoscope unit, it is preferable that the brightness of the image displayed on the monitor is stable. However, the brightness of the image varies depending on fluctuations in the amount of light emitted from the light source and the observed part of the subject. Therefore, the brightness of the image is detected based on the acquired image signal, and the aperture amount of the diaphragm and the exposure time in the image sensor are adjusted based on the brightness of the image (see Patent Document 1).

  However, there is a time delay until the image sensor exposes the optical image with the exposure time determined according to the brightness of the image. Due to such a delay, a time delay has occurred even before the brightness of the display image on the monitor is stabilized. Furthermore, the aperture of the diaphragm that is adjusted at the same time and the exposure time at that time are not an appropriate combination, and the brightness of the display image may oscillate.

JP 2006-141435 A

  Therefore, an object of the present invention is to provide an endoscope processor that eliminates the time delay until the exposure with the determined exposure time is executed after the exposure time of the image sensor is determined.

  An endoscope processor according to the present invention includes a determination unit that determines a first exposure time for causing an image sensor that receives an optical image of a subject to generate an image signal of a first frame, and the image sensor includes a first exposure. A first calculator that calculates a first gain based on a delay amount from the first frame of a frame that generates an image signal in time; and a multiplier that multiplies the image signal of the first frame by the first gain. It is characterized by having.

  The delay amount is a delay frame in units of frames, and the first calculator has an exposure time determined to generate the image signal of the nth frame before the delay frame from the first frame. It is preferable to calculate the first gain based on a certain nth exposure time.

  Further, it is preferable that the first calculator calculates the first gain by dividing the first exposure time by the nth exposure time.

  Moreover, it is preferable to provide the receiver which acquires delay amount from the connected endoscope.

  Also, a discriminator for identifying a connected endoscope, a memory for storing a delay amount for each connected endoscope, and a delay amount corresponding to the endoscope identified by the discriminator are first calculated. It is preferable to provide the selector which outputs to a device.

  In addition, it is preferable that a second calculator that calculates the amount of light received by the image sensor based on the image signal is provided, and the determination unit determines the first exposure time based on the amount of light received by the image sensor.

  In addition, it is preferable that a light amount adjuster that adjusts the light amount of the irradiation light that irradiates the subject is provided, and the determination unit determines the light amount of the irradiation light together with the first exposure time based on the light reception amount of the image sensor.

  Moreover, it is preferable to provide the light source which irradiates irradiation light, and a light quantity adjuster adjusts the light quantity of irradiation light by adjusting the electric power supplied to a light source.

  The light amount adjuster is preferably a diaphragm provided on the optical path of the irradiation light emitted from the light source and having an opening amount that changes according to the displacement from the optical path.

  An endoscope unit according to the present invention is an endoscope unit having an endoscope and an endoscope processor, and is provided in the endoscope processor as a first imaging element that receives an optical image of a subject. A determination unit that determines a first exposure time for generating an image signal of a frame, and a frame that is provided in at least one of the endoscope and the endoscope processor and that generates an image signal with the first exposure time. A memory for storing a delay amount from the first frame, a first calculator provided in the endoscope processor for calculating a first gain based on the delay amount, and a first calculator provided in the endoscope processor. And a multiplier for multiplying the image signal of the first frame by the gain.

  According to the present invention, it is possible to eliminate the time delay until the exposure with the determined exposure time is executed by processing the generated image signal.

1 is a block diagram schematically showing an internal configuration of an endoscope unit including an endoscope processor to which a first embodiment of the present invention is applied. FIG. It is a graph which shows the relationship between exposure time and the luminance value of an image. It is a flowchart which shows control of the operation | movement of each site | part performed by the system controller at the time of imaging | photography of a real-time moving image.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram schematically showing an internal configuration of an endoscope unit having an endoscope processor to which the first embodiment of the present invention is applied.

  The endoscope unit 10 includes an endoscope processor 20, an electronic endoscope 30, and a monitor 11. The endoscope processor 20 is connected to the electronic endoscope 30 and the monitor 11.

  Illumination light for illuminating the subject is supplied from the endoscope processor 20 to the electronic endoscope 30. The subject irradiated with the illumination light is imaged by the electronic endoscope 30. An image signal generated by imaging of the electronic endoscope 30 is sent to the endoscope processor 20.

  In the endoscope processor 20, predetermined signal processing is performed on the image signal obtained from the electronic endoscope 30. The image signal subjected to the predetermined signal processing is transmitted to the monitor 11, and an image corresponding to the transmitted image signal is displayed on the monitor 11.

  Next, the configuration of the endoscope processor 20 will be described. The endoscope processor 20 includes a light source system 21, a processor image processing circuit 22, a multiplier 23, and a system controller 24 (determination unit, first calculator, second calculator, discriminator, selector, receiver). Etc. are provided.

  As will be described later, illumination light to be supplied to the electronic endoscope 30 is emitted from the light source system 21. In the processor image processing circuit 22, predetermined signal processing is performed on the image signal generated by the electronic endoscope 30. As will be described later, the multiplier 23 multiplies the image signal by the gain determined by the system controller 24 and adjusts the brightness of the image displayed on the monitor 11. Further, the operation of each part of the endoscope unit 20 is controlled by the system controller 24.

  When the endoscope processor 20 and the electronic endoscope 30 are connected, the light source system 21 and the light guide 31 provided in the electronic endoscope 30 are optically connected. Further, when the endoscope processor 20 and the electronic endoscope 30 are connected, the processor image processing circuit 22 and the endoscope image processing circuit 33 provided in the electronic endoscope 30 are also connected to the system controller 24 and the electronic endoscope. An endoscope memory 32 and a scope controller 34 provided in the mirror 30 are electrically connected.

  Next, the configuration of the light source system 21 will be described. The light source system 21 includes a light source 21a, a mechanical aperture mechanism 21b (light quantity adjuster), and an aperture drive circuit 21c. The light source 21a is, for example, a xenon lamp, and high-intensity white light is emitted as illumination light. A condenser lens 21d and a mechanical aperture mechanism 21b are provided in the optical path for guiding the illumination light emitted from the light source 21a to the incident end of the light guide 31. The illumination light emitted from the light source 21 a is condensed on the condenser lens 21 d, the amount of light is adjusted by the mechanical aperture mechanism 21 b, and is incident on the incident end of the light guide 31.

  The mechanical diaphragm mechanism 21b is provided with a diaphragm (not shown) whose opening amount changes according to the displacement from the optical path. By adjusting the opening amount, the amount of light supplied to the light guide 31 of the illumination light is adjusted. The aperture amount of the diaphragm is adjusted by driving a motor (not shown) provided in the mechanical diaphragm mechanism 21b. The driving of the diaphragm by the motor is controlled by the diaphragm driving circuit 21c. The aperture drive circuit 21 c is connected to the processor image processing circuit 22 via the system controller 24.

  As will be described later, the brightness of the captured image is detected by the processor image processing circuit 22 based on an image signal generated by the image sensor 35. The detected luminance of the image is transmitted to the system controller 24 as data. In the system controller 24, the aperture amount of the aperture is calculated according to the luminance of the image, and the motor is driven by the aperture drive circuit 21c so that the calculated aperture amount is obtained.

  Next, the configuration of the electronic endoscope 30 will be described. The electronic endoscope 30 is provided with a light guide 31, an endoscope memory 32, an endoscope image processing circuit 33, a scope controller 34, an image sensor 35, and the like.

  The light guide 31 extends from the connector 36 connected to the endoscope processor 20 to the distal end of the insertion tube 37. Illumination light emitted from the light source system 21 enters the incident end of the light guide 31. The illumination light incident on the incident end is transmitted to the exit end. The illumination light transmitted to the emission end is irradiated to the subject in the distal direction of the insertion tube 37 through the light distribution lens 38.

  An optical image of the reflected light of the subject irradiated with the illumination light is formed on the light receiving surface of the image sensor 35 by the objective lens 39 provided at the distal end of the insertion tube 37. The imaging device 35 is controlled by a scope controller 34 provided in the connector 36, and is driven so as to generate an image signal of one frame every fixed period, for example, 1/60 second.

  The image sensor 35 is provided with an electric shutter function, and it is possible to change the exposure time to the image sensor 35 when generating an image signal of one frame. The exposure time is controlled by the scope controller 34.

  The generated image signal is transmitted to an endoscope image processing circuit 33 provided in the connector 36. In the endoscope image processing circuit 33, predetermined signal processing such as correlated double sampling processing and A / D conversion processing is performed on the image signal. The image signal subjected to the predetermined signal processing is transmitted to the processor image processing circuit 22.

  The endoscope memory 32 stores data such as the type of the electronic endoscope 30, a necessary light amount, and a delay time described later. These data are read out to the system controller 24 when the electronic endoscope 30 is connected to the endoscope processor 20. The system controller 24 controls the operation of each part of the endoscope unit 10 based on the read data.

  The processor image processing circuit 22 performs predetermined image processing on the received image signal. The image signal that has undergone the predetermined image processing is transmitted to the multiplier 23.

  The processor image processing circuit 22 calculates the luminance of the entire image. Note that the brightness of the entire image is calculated by averaging the brightness of all pixels. Instead of the luminance of the entire image, a value representative of the luminance of the image such as the luminance of the central portion, that is, the average value of the luminance of all the pixels of the central portion may be calculated. The calculated luminance is transmitted to the system controller 24 as luminance data.

  An SDRAM (not shown) that functions as a work memory is connected to the system controller 24. The luminance data received from the processor image processing circuit 22 is stored in the SDRAM. When the luminance data based on the image signal of the latest frame is stored in the SDRAM, the system controller 24 reads the luminance data based on the image signals of the latest plural frames, for example, three frames from the SDRAM, and calculates the average value of the luminance.

  The system controller 24 is connected to an EEPROM 25 that stores data for controlling each part of the endoscope unit 10. The EEPROM 25 stores a predetermined ideal value of luminance of the image as data. The system controller 24 calculates the difference between the calculated average brightness value and the ideal brightness value.

  The system controller 24 calculates the aperture amount of the aperture and the exposure time changes Δo and Δet of the image sensor 35 based on the difference between the average value of the luminance and the ideal value of the luminance.

  Note that the opening amounts and exposure time variations Δo and Δet are calculated in consideration of other variables. For example, the aperture amount of the diaphragm is adjusted so as to suppress excessive supply of thermal energy to the subject due to illumination light, and the exposure time is adjusted so as to suppress blur due to the movement of the subject. Thus, the variation combinations Δo and Δet corresponding to the difference between the ideal values are calculated while satisfying other variables and constraints.

  In the system controller 24, an aperture amount (o + Δo) of an aperture obtained by adding the calculated changes Δo and Δet to the aperture amount o and the exposure time et when the processor image processing circuit 22 generates the latest image signal received, and The exposure time (et + Δet) of the image sensor 35 is determined as the opening amount to be set and the exposure time.

  The calculated aperture opening amount (o + Δo) is transmitted as a control signal to the aperture driving circuit 21c. As described above, the aperture driving circuit 21c drives the motor so that the aperture amount of the aperture becomes the received aperture amount (o + Δo).

  Further, the calculated exposure time (et + Δet) of the image sensor 35 is transmitted to the scope controller 34 as a control signal. The scope controller 34 causes the image sensor 35 to perform exposure of the optical image of the subject with the received exposure time (et + Δet).

  The transmission time of the aperture opening amount (o + Δo) from the system controller 24 to the aperture driving circuit 21c is sufficiently short, and is newly calculated when the image signal of the next frame of the image signal received by the processor image processing circuit 22 is generated. The diaphragm is driven so that the opening amount is set.

  On the other hand, after the calculation by the system controller 24, a delay that cannot be ignored occurs until the image sensor 35 is exposed for the calculated exposure time (et + Δet). The delay is caused by a communication delay between the endoscope processor 20 and the electronic endoscope 30 and a communication delay between the scope controller 34 and the imaging device 35, and is constant for each connected electronic endoscope 30. is there.

  The delay time from the calculation by the system controller 24 to the exposure of the image sensor 35 is detected in advance at the time of manufacture, for example, and stored as data in the endoscope memory 32. The delay time is stored as a frame interval from an ideal frame for which the calculated exposure time should be set to a frame that is actually controlled to be exposed with the exposure time calculated by the image sensor 32.

  As described above, the system controller 24 calculates a set of the aperture amount of the diaphragm and the exposure time of the image sensor 35 that brings the luminance of the image close to the ideal luminance. However, a deviation occurs in the timing of exposure according to the adjustment to the calculated opening amount and the calculated exposure time. Therefore, the system controller 24 calculates a correction gain for correcting this deviation as described below.

  As shown in FIG. 2, the amount of light received by the image sensor 35 is proportional to the exposure time of the image sensor 35. Therefore, the reference brightness value sl of the image exposed at the reference exposure time st serving as the reference and the current brightness value cl of the image exposed at the current exposure time ct satisfy the relationship of the following expression (1).

  ct / st = cl / sl (1)

  Therefore, an image signal of an image in which the exposure time of the image sensor 35 is set to the current exposure time ct is obtained by multiplying the image signal at the reference exposure time st by a ratio (ct / st) between the current exposure time ct and the reference exposure time st. It is substantially equal to the image signal.

  Therefore, a correction gain for correcting the above-described deviation is calculated by dividing the exposure time it to be set by the actual exposure time rt.

  Next, the correction gain calculated for one frame of image signal generated every 1/60 seconds will be described with reference to Table 1.

  As described above, the image signals of the (n−1) th, nth, (n + 1) th, (n + 2), (n + 3), (n + 4),... Frames are obtained every 1/60 seconds. Generated. Before each image signal is generated, an exposure time to be set is calculated based on the previously generated image signal. For example, the nth exposure time et (n) is calculated as the exposure time to be set for the image signal of the nth frame.

  However, as described above, there is a delay in the frame from the frame in which the calculated exposure time should be used until the exposure with the exposure time actually calculated by the image sensor 35 is executed. In this embodiment, there are 4 frames. As described above, the frame interval of the delay time is stored in the endoscope memory 32 and read out to the system controller 24 when the electronic endoscope 30 and the endoscope processor 20 are connected.

  Due to the delay, the image signal of the nth frame is set to the exposure time et (n-4) to be set for the image signal of the (n-4) th frame recognized as the exposure time to be set before 4 frames. ), The optical image is exposed to generate an image signal of the nth frame.

  Therefore, the luminance value of the image signal of the nth frame is Li × (et (n−4) / et (n)) with respect to the ideal luminance value Li of the image. Therefore, the luminance value is corrected to the ideal luminance value Li by multiplying the image signal of the nth frame by (et (n) / et (n-4)) as the correction gain.

  Similarly, the luminance value is corrected to the ideal value Li by multiplying the image signal of the (n + 1) th frame by (et (n + 1) / et (n-3)) as a correction gain. Hereinafter, similarly, ((exposure time to be set) / (actual exposure time of the image sensor)), that is, ((exposure time to be set) / (set to the frame before the delay frame) Exposure time)) to be calculated is calculated as a correction gain.

  The calculated correction gain is transmitted to the multiplier 23 as data. As described above, the image signal is transmitted to the multiplier 23. In the multiplier 23, the image signal is multiplied by the correction gain.

  The image signal corrected by the correction gain is transmitted to the monitor 11. An image corresponding to the received image signal is displayed on the monitor 11.

  As described above, the image sensor 35 is driven so as to generate an image signal every 1/60 seconds, and the image signal is also transmitted to the monitor 11 every 1/60 seconds. A moving image is displayed on the monitor 11 by switching the image to be displayed every 1/60 seconds.

  If a still image observation command is input to an input unit (not shown) while a moving image is being displayed on the monitor 11, transmission of the image signal to the monitor 11 is stopped and a still image of the subject is displayed on the monitor 11. It is also possible.

  Next, control of the operation of each part executed by the system controller 24 at the time of capturing a real-time moving image will be described with reference to the flowchart of FIG. Control at the time of photographing is started when the main power supply is turned on with the electronic endoscope 30 connected to the endoscope processor 20. Further, the control in photographing ends when the main power is turned off.

  In step S <b> 100, data unique to the connected electronic endoscope 30 including the delay time is read from the connected endoscope memory 32. When the unique data is read, the process proceeds to step S101.

  In step S101, initialization of each part of the endoscope unit 20 is executed. For example, initial setting of aperture ratio of aperture, initial setting of exposure time, and setting of initial value of correction gain are executed. After completion of initialization, the process proceeds to step S102.

  In step S <b> 102, the image sensor 35 is caused to generate an image signal of one frame via the scope controller 34. After the generation of the image signal, the process proceeds to step S103, and the generated image signal is stored in the SDRAM. After storing in the SDRAM, the process proceeds to step S104.

  In step S104, the processor image processing circuit 22 is driven so as to perform predetermined image processing on the latest image signal stored in the SDRAM. After predetermined image processing, the process proceeds to step S105.

  In step S105, the image signal is multiplied by the set correction gain to correct the luminance component of the image signal. Before calculating the correction gain, the image signal is corrected using the initial value of the correction gain set in step S101. After the luminance correction of the image signal, the process proceeds to step S106.

  In step S106, the image signal on which the luminance correction has been performed is transmitted to the monitor 11. After transmitting the image signal to the monitor 11, the process proceeds to step S107.

  In step S107, the latest three frames of image signals stored in the SDRAM are read, and the average value of the luminance of each image signal is calculated. After calculating the average value of luminance, the process proceeds to step S108.

  In step S108, the ideal luminance value is read from the EEPROM 25. Also, the difference between the average luminance value calculated in step S107 and the ideal luminance value is calculated. After calculating the difference, the process proceeds to step S109.

  In step S109, the aperture amount to be set and the exposure time of the image sensor 35 are calculated based on the difference calculated in step S108. After calculating the opening amount to be set and the exposure time, the process proceeds to step S110. The calculated exposure time is stored in the SDRAM.

  In step S110, the exposure time calculated for the frame before the delay frame interval in the unique data read in step S100 is read from the SDRAM. If the exposure time is not stored, the initial setting value of the exposure time is read. Further, a correction gain is calculated based on the read exposure time and the exposure time calculated in step S109. After calculating the correction gain, the process proceeds to step S111.

  In step S111, the aperture opening amount calculated in step S109, the exposure time of the image sensor 35, and the correction gain calculated in step S110 are transmitted as signals to the aperture driving circuit 21c, the scope controller 34, and the multiplier 23, respectively. . Based on the transmitted signal, the aperture setting of the diaphragm, the exposure time of the image sensor 35, and the setting of the correction gain of the multiplier 23 are updated. After transmitting the signal, the process returns to step 102.

  As described above, according to the endoscope processor to which the first embodiment is applied, the brightness adjustment delay of the image displayed on the monitor 11 due to the delay until the exposure is actually performed with the exposure time to be set. It can be resolved.

  Further, in the first embodiment, since the delay in adjusting the brightness of the image is eliminated, the incompatibility between the aperture amount adjustment and the exposure time adjustment is also eliminated. Therefore, the brightness fluctuation of the display image is improved.

  Next, an endoscope processor to which the second embodiment of the present invention is applied will be described. The endoscope processor according to the second embodiment is different from the first embodiment in that the delay time is stored in the memory. Hereinafter, a description will be given focusing on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as 1st Embodiment.

  The configurations and functions of the electronic endoscope 30, the endoscope processor 20, and the monitor 11 in the second embodiment are such that no delay time is stored in the endoscope memory 32, and various types of electronic devices are stored in the EEPROM 25. This is the same as the first embodiment except that the delay time of the endoscope is stored.

  As in the first embodiment, when the electronic endoscope 30 is connected to the endoscope processor 20, data such as the type of the electronic endoscope 30 and the necessary light amount is read out to the system controller 24. Unlike the first embodiment, the system controller 24 selects and reads a delay time corresponding to the type of the connected electronic endoscope 30 from the EEPROM 25.

  The system controller 24 calculates a correction gain based on the delay time read from the EEPROM 25 as in the first embodiment. The calculated correction gain is transmitted to the multiplier 23 and used for luminance correction of the image signal, as in the first embodiment.

  As described above, according to the endoscope processor 20 to which the second embodiment is applied, as in the first embodiment, the image is displayed on the monitor 11 due to the delay until the exposure is actually performed with the exposure time to be set. It is possible to eliminate the delay in adjusting the brightness of the image.

  Further, according to the second embodiment, since the delay time for each electronic endoscope 30 used in the endoscope processor 20 is stored, it is a case where an electronic endoscope that does not store delay information is used. However, it is possible to eliminate the delay in adjusting the brightness of the image.

  In the first and second embodiments, the correction gain is calculated by dividing the exposure time to be set by the exposure time to be set for the frame before the delay frame. The correction gain may be calculated by other methods. If the correction gain is calculated by a method capable of eliminating the difference in brightness due to the delay based on the delay time until the actual exposure is performed with the exposure time to be set, the same as in the first and second embodiments. An effect can be obtained.

  In the first and second embodiments, the aperture amount of the diaphragm and the exposure time of the image sensor 35 are calculated based on the luminance of the image. However, the aperture amount of the aperture need not be calculated. Even if the aperture amount of the aperture is not adjusted with the exposure time, it is possible to obtain the effect of eliminating the delay in adjusting the brightness of the image.

  In the first and second embodiments, the amount of illumination light applied to the subject is adjusted by adjusting the aperture of the diaphragm, but may be adjusted by other methods. For example, the amount of light emitted from the light source 21a may be directly adjusted. For example, when an LED or the like is used as a light source, the amount of emitted light can be sufficiently adjusted as compared with a xenon lamp or the like.

  In the first and second embodiments, the exposure time of the image sensor 35 is determined based on the luminance of the image, but may be determined by other methods. For example, the exposure time may be determined based on the detected light amount by detecting the amount of illumination light applied to the subject, or the brightness of the subject may be detected using a light receiving sensor different from the image sensor 35. The exposure time may be determined.

  In the first embodiment, the delay time is recorded in the endoscope memory 32, and in the second embodiment, the delay time is recorded in the EEPROM 25. However, the delay time is recorded in both the endoscope memory 32 and the EEPROM 25. The configuration may be such that time is recorded. When the delay time is stored in the endoscope memory 32 and the EEPROM 25, the delay time may be read from either one, or read from both and calculated by a predetermined formula such as averaging.

DESCRIPTION OF SYMBOLS 10 Endoscope unit 20 Endoscope processor 21a Light source 21b Mechanical aperture mechanism 21c Aperture drive circuit 22 Processor image processing circuit 23 Multiplier 24 System controller 25 EEPROM
30 Electronic Endoscope 32 Endoscope Memory 34 Scope Controller 35 Image Sensor

Claims (10)

A determination unit that determines a first exposure time for causing an image sensor that receives an optical image of a subject to generate an image signal of a first frame;
A first calculator that calculates a first gain based on a delay amount from the first frame of a frame in which the imaging element generates the image signal at the first exposure time;
An endoscope processor, comprising: a multiplier that multiplies the image signal of the first frame by the first gain. The delay amount is a delay frame in units of frames,
The first calculator is based on an nth exposure time that is an exposure time determined to generate an image signal of an nth frame before the delay frame from the first frame. The endoscope processor according to claim 1, wherein the gain of the endoscope is calculated.   The endoscope processor according to claim 2, wherein the first calculator calculates the first gain by dividing the first exposure time by the n-th exposure time.   The endoscope processor according to any one of claims 1 to 3, further comprising a receiver that acquires the delay amount from a connected endoscope. An identifier for identifying the endoscope to be connected;
A memory for storing the delay amount for each of the connected endoscopes;
The selector which outputs the said delay amount corresponding to the said endoscope identified by the said discriminator to a said 1st calculator is provided. Any one of Claims 1-3 characterized by the above-mentioned. The described endoscope processor.   A second calculator that calculates the amount of light received by the image sensor based on the image signal is provided, and the determination unit determines the first exposure time based on the amount of light received by the image sensor. The endoscope processor according to any one of claims 1 to 5.   A light amount adjuster that adjusts a light amount of the irradiation light that irradiates the subject, and the determination unit determines the light amount of the irradiation light together with the first exposure time based on a light reception amount of the image sensor; The endoscope processor according to any one of claims 1 to 6.   The endoscope processor according to claim 7, further comprising: a light source that emits the irradiation light, wherein the light amount adjuster adjusts a light amount of the irradiation light by adjusting electric power supplied to the light source. A light source for emitting the irradiation light,
The endoscope according to claim 7, wherein the light amount adjuster is a stop provided on an optical path of the irradiation light emitted from the light source, and an aperture amount is changed according to a displacement from the optical path. Mirror processor. An endoscope unit having an endoscope and an endoscope processor,
A determination unit that is provided in the endoscope processor and determines a first exposure time for causing an image sensor that receives an optical image of a subject to generate an image signal of a first frame;
A memory that is provided in at least one of the endoscope and the endoscope processor, and stores a delay amount from the first frame of a frame in which the image sensor generates the image signal at the first exposure time. When,
A first calculator provided in the endoscope processor for calculating a first gain based on the delay amount;
An endoscope unit, comprising: a multiplier provided in the endoscope processor for multiplying the image signal of the first frame by the first gain.

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