JP2013017752A - Noise removal device, display device including the same, camera control unit, and endoscope system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise removal device performing noise suppression processing for attenuating a specific frequency component included in a video signal of an endoscope observation image only under a situation where an unnecessary radiated electric wave occurs.SOLUTION: This noise removal device includes: an acquisition part acquiring the video signal based on the observation image obtained by an endoscope; a filtering part attenuating the specific frequency component included in the video signal by filter processing; a detection part detecting drive operation of a treatment device performing cauterization treatment; a changeover part changing over ON/OFF of the filter processing to the video signal according to whether or not the drive operation of the treatment device is detected as the result of the detection; and an output part outputting the acquired video signal or the video signal after the filter processing.

Description

  The present invention relates to a system for suppressing image noise superimposed on an endoscopic image captured by radiation noise generated by a high-frequency cautery device used when performing a medical procedure under endoscopic observation.

  Conventionally, medical treatment using cauterization treatment has been widely performed under endoscopic observation. The high-frequency cautery device used for such cauterization treatment outputs a high-voltage signal with a high voltage and a large current. At the time of this output, unnecessary radiated radio waves that leak to the outside of the high-frequency cautery device are generated. This unnecessary radiated radio wave is mixed from a route from a video cable connecting a CCD (charge-coupled device) or CCU (camera control unit) and a display device. For this reason, image noise may be applied to the endoscopic image displayed on the display device, which may hinder observation.

  Conventionally, image noise has been suppressed by operations such as a method of electrically separating by interposing an insulating transformer between the induction cautery device and the CCU and the display device, or a method of separating the distance from the induction cautery device. However, these methods have not been sufficient as methods for suppressing image noise.

  In the field of radiation diagnosis, a periodic noise pattern in a striped pattern may be recorded at the time of imaging. Therefore, there is a method of removing a noise pattern by extracting a spatial frequency component of a periodic noise pattern in a striped pattern by filtering, and subtracting the extracted spatial frequency component from an observation image (for example, Patent Documents). 1.).

  However, when the method of Patent Document 1 is applied to noise removal caused by the high-frequency cautery device, the following problems can be considered. In the method of Patent Document 1, in order to extract the spatial frequency of noise, a step of extracting a spatial frequency using filter processing and two steps of subtracting the extracted spatial frequency from the observation image are required. Arise. For example, when extracting the spatial frequency of noise from the image for one field in the horizontal direction and the vertical direction, a delay of at least one field occurs. In the method of Patent Document 1, a radiology still image is targeted, and delay is not a problem. However, in the case of endoscopic observation, if a delay of a certain level or more occurs, there is a difference between the state of observation through the endoscope display device and the actual movement of the endoscope scope or treatment instrument. There is a possibility of becoming uncomfortable for the surgeon.

  In addition, as a prior art, there exist patent document 2-patent document 5 shown below.

JP 2007-265091 A JP 7-47078 A JP 11-318909 A JP 2001-258901 A JP 7-47080 A

  As another noise removal method, there is a method of attenuating a specific frequency component that is always assumed to have noise by a filter. However, in this case, since the specific frequency component of the observation image is suppressed regardless of the presence or absence of noise, for example, when a low-pass filter is used, a frequency component higher than the cutoff frequency is always suppressed. Since the high frequency component corresponds to a portion where there is a minute change in the observation image, there is a possibility that the image looks like a loss of resolution.

  Therefore, the present invention provides a noise removal device that performs noise suppression processing for attenuating a specific frequency component included in a video signal of an endoscopic observation image only under a situation where unnecessary radiated radio waves are generated.

  The noise removal device according to the present invention includes an acquisition unit that acquires a video signal based on an observation image obtained by an endoscope, a filtering unit that attenuates a specific frequency component included in the video signal by filtering, and an ablation A detection unit that detects a drive operation of a treatment device that performs treatment, and a switch that switches ON / OFF of a filter process for the video signal according to whether or not the drive operation of the treatment device is detected as a result of the detection. And an output unit that outputs the acquired video signal or the filtered video signal.

  In the noise removing device, when the detection unit detects a signal indicating that the treatment device is driven, the switching unit controls the filtering unit to perform a filtering process on the acquired video signal, When the filtered video signal is output to the output unit, and the detection unit does not detect a signal indicating that the treatment device is driven, the switching unit outputs the acquired video signal to the output unit. It is characterized by being output to.

  The noise removing device further includes an operation signal acquisition unit that acquires a signal indicating that the treatment device is driven to operate from the treatment device or a foot switch instructing driving of the treatment device.

The display device includes the noise removing device. The camera control unit includes the noise removing device. The endoscope system includes the noise removing device.
The noise removal device according to the present invention includes an acquisition unit that acquires a video signal based on an observation image obtained by an endoscope, a filtering unit that attenuates a specific frequency component included in the video signal by a filter process, A detection unit that detects a specific frequency component included in the video signal; and, as a result of the detection, whether or not the video signal includes a specific frequency component is turned on for filtering processing on the video signal A switching unit that switches between / OFF and an output unit that outputs the acquired video signal or the filtered video signal.

  In the noise removal apparatus, when the specific frequency component included in the video signal is detected by the detection unit, the switching unit controls a filtering unit to perform a filtering process on the acquired video signal, The filtered video signal is output to the output unit, and when the specific frequency component included in the video signal is not detected by the detection unit, the switching unit outputs the acquired video signal to the output unit. To do.

  In the noise removing device, the detection unit has at least one bandpass filter that passes the video signal having a frequency band corresponding to a driving frequency of the treatment device, and a level of the video signal that has passed through the bandpass filter is predetermined. And a determination unit that determines whether or not the threshold is equal to or greater than the threshold value.

  The display device includes the noise removing device. The camera control unit includes the noise removing device. The endoscope system includes the noise removing device.

  According to the present invention, it is possible to perform noise suppression processing for attenuating a specific frequency component included in a video signal of an endoscopic observation image only under a situation where unnecessary radiated radio waves are generated.

1 shows a schematic configuration (Example 1) of an entire endoscope system according to a first embodiment. 1 shows a schematic configuration (Example 2) of an entire endoscope system according to a first embodiment. An example of the noise suppression processing unit 9 in the first embodiment is shown. An example of the notch filter in 1st Embodiment is shown. An example of the model corresponding | compatible notch filter relationship table 130 in 1st Embodiment is shown. It is a figure for demonstrating the noise removal in 1st Embodiment. The schematic structure (Example 1) of the whole endoscope system in 2nd Embodiment is shown. The schematic structure (Example 2) of the whole endoscope system in 2nd Embodiment is shown. An example of the noise detection part 18 in 2nd Embodiment is shown. An example of the noise determination threshold value table 200 in 2nd Embodiment is shown. The schematic structure (Example 1) of the whole endoscope system in 3rd Embodiment is shown. The schematic structure (Example 2) of the whole endoscope system in 3rd Embodiment is shown. The schematic structure (Example 1) of the whole endoscope system in 4th Embodiment is shown. The schematic structure (Example 2) of the whole endoscope system in 4th Embodiment is shown.

<First Embodiment>
FIG. 1 shows a schematic configuration (Example 1) of the entire endoscope system according to the first embodiment. FIG. 1 shows an embodiment where the signal input to the display device 4 is an analog signal. The endoscope system includes an endoscope 1 (imaging means), a CCU 2 (camera control unit), a high-frequency cautery device 3, and a display device 4.

  The endoscope 1 (imaging means) is inserted into a patient's body and captures an image inside the body. The CCU 2 converts an electrical signal obtained by imaging with the endoscope 1 into a video signal (analog signal), and outputs the video signal to the display device 4. The high-frequency cautery device 3 performs hemostasis at a treatment site or excision of a living tissue. The display device 4 displays the video signal generated by the CCU 2.

  The endoscope 1 has a built-in CCD (not shown), and the CCD can image a subject. The endoscope 1 is connected to the CCU 2. A display device 4 is connected to the CCU 2 through a video signal line 15. A signal output from the endoscope 1 is transmitted to the CCU 2. The CCU 2 generates a video signal from the signal transmitted from the endoscope 1 and outputs it to the display device 4. The display device 4 displays the subject imaged by the CCD.

  A foot switch 5 is connected to the high-frequency cautery device 3. A cord 6 is connected to the high-frequency cautery device 3. A treatment tool (not shown) is connected to the end of the cord 6. The treatment tool passes through the endoscope channel, and the distal end of the treatment tool reaches the living tissue in the patient. When the foot switch 5 is pressed, a drive command signal for driving the high-frequency cautery device 3 is transmitted to the high-frequency cautery device 3. When this drive command signal is received, the high-frequency cautery device 3 is driven, and cauterization treatment is performed on the living body tissue. When the foot switch 5 is released from the pressed state, transmission of the drive command signal for driving the high-frequency cautery device 3 is stopped. Then, the drive of the high frequency cautery device 3 is stopped. The induction cautery device 3 and the display device 4 are connected by a communication line 16.

  The display device 4 includes a video interface (I / F) 7, a switch 8, a noise suppression processing unit 9, a video processing unit 10, a display unit 11, a communication I / F 12, and a switch controller 13. A video signal (analog signal) from the CCU 2 is input to the video I / F 7.

  The communication I / F 12 communicates with the high frequency cautery device 3. The communication I / F 12 is input with a signal transmitted from the high-frequency ablation device 3 indicating whether or not the high-frequency ablation device 3 is operating and device information of the high-frequency ablation device 3 (for example, model name, model name, etc.). Is done.

  The switch controller 13 controls the switch 8 based on the information obtained from the communication I / F 12. The switch 8 sends the video signal input from the video I / F 7 to the video processing unit 10 or the noise suppression processing unit 9 based on the control by the switch controller 13.

  The noise suppression processing unit 9 suppresses noise components included in the video signal according to the drive frequency of the high-frequency cautery device 3. The video processing unit 10 processes a video signal. The display unit 11 displays an image based on the video processed signal.

  FIG. 2 shows a schematic configuration (Example 2) of the entire endoscope system according to the first embodiment. FIG. 2 shows an embodiment in which the signal input to the display device 4 is a digital signal. In FIG. 2, a digital signal is output from the CCU 2 as a video signal. Unlike FIG. 1, in FIG. 2, the video processing unit 10 is provided between the video I / F 7 and the switch 8.

  FIG. 3 shows an example of the noise suppression processing unit 9 in the first embodiment. FIG. 4 shows an example of the notch filter in the first embodiment. The noise suppression processing unit 9 includes one or more filters that attenuate a specific frequency. In the present embodiment, the noise suppression processing unit 9 includes one or more notch filters 14 as an example. When the video signal input to the video I / F 7 is an analog signal, a capacitor (C shown in FIG. 3) is used for each of R (red), G (green), and B (blue) signals that are video information. ) And the notch filter 14 composed of the coil (L). When there is an external synchronization signal (horizontal drive signal (HD), vertical drive signal (VD)) separated from the video signal, the external synchronization signal is not processed by the notch filter 14.

  When the video signal input to the video I / F 7 is a digital signal such as an SDI (Serial Digital Interface) signal, the notch filter 14 configured by a digital filter is used.

  The noise suppression processing unit 9 includes a plurality of notch filters 14 corresponding to the driving frequency of the electric knife, such as a notch filter having a characteristic of attenuating 350 kHz and a notch filter having a characteristic of attenuating 1 MHz.

In the present embodiment, the noise suppression processing unit 9 is configured with a notch filter, but is not limited thereto, and may be configured with a filter such as a band pass filter.
Next, the effect | action of the said structure is demonstrated using FIG.1 and FIG.2. While the foot switch 5 is being pressed, the high frequency ablation device 3 operates, a high frequency current flows through the treatment instrument, and the affected tissue is cauterized at the distal end of the treatment instrument.

  At the time of cauterization, a high-frequency signal with high voltage and large current is output from the high-frequency cautery device 3. At the time of outputting the high frequency signal, an unnecessary radiation wave is generated from the high frequency cautery device 3. Due to the influence of the unnecessary radiation wave, noise is superimposed on the electric signal output from the CCD in the endoscope 1 and the video signal transmitted through the video signal line 15 connecting the CCU 2 and the display device 4. This video signal is input to the display device 4. In the display device 4, noise suppression processing is performed by the following processing.

First, when communication between the high-frequency cautery device 3 and the display device 4 is established, the high-frequency cautery device 3 inputs model information to the communication I / F 12 via the communication line 16.
The switch controller 13 inside the display device 4 acquires the input model information of the high-frequency cautery device 3. The switch controller 13 determines the notch filter 14 that attenuates the same band as the drive frequency of the model of the high-frequency cautery device 3 according to the acquired model information. Here, the switch controller 13 has a model-notch filter relationship in which model information of the high-frequency ablation device 3 and a notch filter 14 having a characteristic of attenuating the same band as the drive frequency of the high-frequency ablation device 3 are associated in advance. A table 130 is set.

  FIG. 5 shows an example of the notch filter relation table 130 corresponding to the model in the first embodiment. The model-corresponding notch filter relation table 130 is a table in which a model of the high-frequency cautery apparatus 3 is associated with a notch filter that attenuates a frequency that matches the driving frequency of the model. The model-corresponding notch filter relation table 130 is stored in advance in a storage device in the display device 4. The model-corresponding notch filter relation table 130 has data items of “model information” 131, “notch filter name” 132, and “center frequency” 133.

  “Model information” 131 stores model information of the induction cautery apparatus 3. The “notch filter name” 132 stores information for identifying a notch filter that attenuates a frequency that matches the drive frequency of the high-frequency cautery device 3 indicated by the model information stored in the “model information” 131. The “center frequency” 133 stores the center frequency that the notch filter attenuates.

  The switch controller 13 detects model information that matches the acquired model information from the model-corresponding notch filter relation table 130, and acquires a notch filter name corresponding to the model information. The switch controller 13 controls the switch 8 to switch the notch filter of the noise suppression processing unit 9 to a notch filter corresponding to the acquired notch filter name.

  FIG. 6 is a diagram for explaining noise removal in the first embodiment. The video signal (analog signal) is superimposed as shown in FIG. 6 (A) by the radiation noise generated by the high-frequency cautery device 3. The frequency component of the noise is the same as the drive frequency of the high frequency cautery device 3.

  FIG. 6B is a diagram illustrating the frequency characteristics of a notch filter that removes the same frequency component as the frequency of the high-frequency cautery device 3. When a video signal (analog signal) including noise shown in FIG. 6A is passed through a notch filter having the characteristics shown in FIG. 6B, the same frequency component as the noise is obtained as shown in FIG. 6C. Can be obtained. Even when the video signal is a digital signal, if the digital signal is passed through a notch filter, a video signal from which the same frequency component as noise is removed can be obtained as shown in FIG.

  In FIG. 1 and FIG. 2, the switch controller 13 detects the drive of the high-frequency ablation device 3 and controls the switch 8 during the drive period so that the switch 8 corresponds to the model of the high-frequency ablation device 3. Noise suppression processing by the notch filter 14 is executed. The video signal subjected to the noise suppression process is output to the display unit 11.

The switch controller 13 also detects the stop of the high-frequency cautery device 3 and controls the switch 8 during the stop period to output a video signal that does not pass through the noise suppression processing unit 9 to the display unit 11.
As described above, in the first embodiment, during the cauterization treatment, noise suppression processing by the notch filter 14 is executed inside the display device 4 in accordance with the operation of the high-frequency cauterization device 3. In this embodiment, since the noise suppression processing unit 9 is provided in the display device 4, noise superimposed on the front stage of the display device 4 (noise superimposed on the CCD and noise superimposed on the video signal line 15). ) Can be suppressed. In addition, since the noise suppression process is performed by the notch filter 14 determined and set based on the model information of the high-frequency cautery apparatus 3, there is no need to extract a noise spatial frequency, and the delay time can be suppressed. Furthermore, by detecting the operation of the high-frequency cautery device 3, when the high-frequency cautery device 3 is not operating, an endoscopic image without unnecessary noise suppression processing can be observed.

<Second Embodiment>
In the first embodiment, the switch controller 13 controls the switching operation of the switch based on the model information of the high-frequency cautery device 3 obtained via the communication line 16. On the other hand, in the second embodiment, a noise component included in the video signal is detected, and the switch controller 13 controls the switching operation of the switch based on the detection result. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 7 shows a schematic configuration (Example 1) of the entire endoscope system according to the second embodiment. FIG. 7 shows an embodiment in which the signal input to the display device 4 is an analog signal. FIG. 8 shows a schematic configuration (Example 2) of the entire endoscope system according to the second embodiment. FIG. 8 shows an embodiment in which the signal input to the display device 4 is a digital signal.

  In the second embodiment, as shown in FIGS. 7 and 8, the communication line 16 and the communication I / F 12 between the high-frequency cautery device 3 and the display device 4 of the first embodiment are eliminated. Instead, a distributor 17 and a noise detector 18 are provided in the display device 4.

  The distributor 17 outputs the video signal input from the video I / F 7 to the switch 8 and the noise detector 18. The noise detector 18 detects the presence / absence of noise and the frequency of the noise with respect to the video signal distributed from the distributor 17.

  FIG. 9 shows an example of the noise detection unit 18 in the second embodiment. The noise detection unit 18 includes one or more band pass filters 19 and a noise determination unit 20. Each band pass filter 19 is a filter that passes the same frequency band that the notch filter 14 of the noise suppression processing unit 9 attenuates. The noise determination part 20 and the switch controller 13 are connected so that communication is possible.

In the present embodiment, a bandpass filter is used in the noise detection unit 18, but the present invention is not limited to this. For example, a filter such as a notch filter may be used.
Next, the operation of FIGS. 7 and 8 will be described. Similar to the first embodiment, when the high-frequency cautery device 3 is driven, unnecessary radio waves are generated from the high-frequency cautery device 3. Due to this influence, the electric signal output from the CCD in the endoscope 1 and the video signal transmitted through the video signal line 15 connecting the CCU 2 and the display device 4 have the same frequency as the driving frequency of the high-frequency cauterization device 3. Noise is superimposed. This video signal is input to the display device 4. The video signal input to the display device 4 passes through the video I / F 7 and is input to the distributor 17.

  The distributor 17 outputs the input video signal to the switch 8 and the noise detector 18. In the noise detection unit 18, the presence / absence of noise and the frequency of noise are detected by a plurality of bandpass filters 19 having characteristics of passing the driving frequency of the high-frequency cautery device and a noise determination unit 20 connected to the output thereof. Specifically, the plurality of bandpass filters 19 are connected in parallel as shown in FIG. 9, and each output is connected to the noise determination unit 20.

  The noise determination unit 20 constantly monitors the output of each of a plurality of connected bandpass filters, and, as shown in FIG. 10, the noise level is determined for each output of the bandpass filter based on a preset threshold value. Judgment is made.

  FIG. 10 shows an example of the noise determination threshold table 200 in the second embodiment. If the level of the video signal is 100%, the signal level of noise superimposed on the video signal is 100% or more. When a video signal on which noise is superimposed is passed through a bandpass filter having ideal characteristics, the noise component is output as it is at a level of 100% or more. Therefore, the threshold of the signal level when determining whether or not it has a noise component may be 100% or more.

  In the noise determination threshold table 200, as an example, when the video signal input to the noise determination unit 20 is an analog signal, 0.7V is set as a threshold, and in the case of a digital signal, 255 (8-bit). Case) 1023 (in the case of 10 bits) is set.

  For example, when the output of the bandpass filter a exceeds a threshold value, the noise determination unit 20 can detect the noise frequency mixed in the video signal from the characteristics of the bandpass filter a.

  As described above, when the noise determination unit 20 detects noise, the noise determination unit 20 sends information indicating that the noise has been detected and noise frequency information to the switch controller 13. The switch controller 13 controls the switch 8 to execute noise suppression processing by the notch filter 14 that attenuates the frequency indicated by the noise frequency information by the noise suppression processing unit 9. The video signal subjected to the noise suppression process is output to the display unit 11.

  When noise is not detected by the noise detection unit 18, the noise determination unit 20 sends information indicating that no noise has been detected to the switch controller 13. Then, the switch controller 13 controls the switch 8 to output a video signal that does not pass through the noise suppression processing unit 9 to the display unit 11.

  According to 2nd Embodiment, there exists the following effect. That is, as shown in FIGS. 7 and 8, the communication line 16 is not necessary, and the layout becomes easy. Moreover, it is not necessary to mount a special communication circuit on the high-frequency cautery device 3. Furthermore, when the noise superimposed on the video signal is so weak that it cannot be detected by the noise detector 18, an endoscopic image without unnecessary filtering by the notch filter 14 can be observed.

<Third Embodiment>
In the first and second embodiments, the noise suppression process by the notch filter 14 is executed in the display device. On the other hand, in 3rd Embodiment, the noise suppression process by the notch filter 14 is performed by CCU2. In the present embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 11 shows a schematic configuration (Example 1) of the entire endoscope system according to the third embodiment. In the first embodiment, the high-frequency cautery device 3 and the display device 4 are connected by the communication line 16. However, in the third embodiment, the high-frequency cautery device 3 and the CCU 2 are connected by the communication line 16. ing.

  The CCU 2 includes a signal I / F 21, a video signal generation unit 22, a switch 8, a noise suppression processing unit 9, a video I / F 23, a communication I / F 12, and a switch controller 13. A signal from the CCD is input to the signal I / F 21. The video signal generator 22 generates a video signal from the signal input from the CCD.

  The communication I / F 12 communicates with the high frequency cautery device 3. The communication I / F 12 includes a signal transmitted from the high-frequency ablation device 3 indicating whether or not the high-frequency ablation device 3 is operating and device information of the high-frequency ablation device 3 (for example, a manufacturing number, a model name, a model name, etc. ) Is entered.

  The switch controller 13 controls the switch 8 based on the information obtained from the communication I / F 12. The switch 8 sends the video signal transmitted from the video signal generation unit 22 to the video I / F 23 or the noise suppression processing unit 9 based on the control by the switch controller 13.

  The noise suppression processing unit 9 suppresses noise components included in the video signal according to the drive frequency of the high-frequency cautery device 3. The video I / F 23 outputs the video signal from the switching unit 8 or the video signal from the noise suppression processing unit 9 to the display device 4.

  The configuration of the endoscope system in the third embodiment (FIG. 11) is that the noise suppression processing in the first embodiment is simply replaced by the CCU 2 from the display device 4, and the operation thereof is the same as in the first embodiment. The operation is the same as that of the endoscope system.

  FIG. 12 shows a schematic configuration (Example 2) of the entire endoscope system according to the third embodiment. The CCU 2 in FIG. 12 is obtained by configuring the configuration of the display device in FIG. The CCU 2 includes a signal I / F 21, a video signal generation unit 22, a switch 8, a noise suppression processing unit 9, a video I / F 23, a switch controller 13, a distributor 17, and a noise detection unit 18.

  A signal from the CCD is input to the signal I / F 21. The video signal generator 22 generates a video signal from the signal input from the CCD. The distributor 17 outputs the video signal input from the video I / F 7 to the switch 8 and the noise detector 18. As shown in FIG. 9, the noise detection unit 18 includes a plurality of bandpass filters 19 and a noise determination unit 20. The plurality of band-pass filters 19 are band-pass filters that pass the same frequency band that the notch filter 14 of the noise suppression processing unit 9 attenuates. The noise determination part 20 and the switch controller 13 are connected so that communication is possible. The switch 8 switches the video signal. The noise suppression processing unit 9 performs noise suppression processing as in the first embodiment. The video I / F 23 outputs a video signal.

  The configuration of the endoscope system in FIG. 12 (FIG. 12) is that the noise suppression processing in the second embodiment is simply replaced by the CCU 2, and the operation is the endoscope in the second embodiment. It is the same as the operation of the system.

  In this embodiment, the signal I / F 21, the video signal generation unit 22, the switch 8, the noise suppression processing unit 9, the video I / F 23, the switch controller 13, the distributor 17, and the noise detection unit 18 are provided in the CCU. However, the present invention is not limited to this, and the device between the endoscope 1 and the display device 4 only needs to include these components.

  According to 3rd Embodiment, there exists the following effect. That is, the noise suppression process by the notch filter 14 can be performed in the CCU 2. Therefore, in this configuration, not only the display device 4 but also a device such as a recording device and a printer (not shown) connected to the video output terminal of the CCU 2 can obtain a noise suppression effect without any special change. .

<Fourth Embodiment>
In the first embodiment, whether or not the high-frequency cautery device 3 is driven is detected, and the switch controller 13 controls the switching operation of the switch based on the detection result. On the other hand, in the fourth embodiment, it is detected whether or not the foot switch 5 is pressed, and the switch controller 13 controls the switching operation of the switch based on the detection result. In addition, in this embodiment, about the structure same as 1-3 embodiment, the same code | symbol is provided and the description is abbreviate | omitted.

  FIG. 13 shows a schematic configuration (Example 1) of the entire endoscope system according to the fourth embodiment. FIG. 13 shows an embodiment where the signal input to the display device 4 is an analog signal. FIG. 14 shows a schematic configuration (Example 2) of the entire endoscope system according to the fourth embodiment. FIG. 14 shows an embodiment when the signal input to the display device 4 is a digital signal.

  Unlike the FIG. 1 and FIG. 2, in the endoscope system of FIG. 13 and FIG. 14, the high frequency cautery device 3 and the display device 4 are not connected, and the foot switch 5 and the display device 4 are connected by the communication line 16. Has been. In the present embodiment, the model information of the high-frequency cautery device 3 is preset in the switch controller 13.

  When the foot switch 5 is pressed, a drive command signal for driving the high-frequency cautery device 3 is output to the high-frequency cautery device 3 and a signal indicating that the foot switch is pressed is communicated via the communication line 16. It is output to the line communication I / F 12.

  While the user is pressing the foot switch 5, the high frequency cautery device 3 operates, a high frequency current flows through the treatment instrument, and the affected tissue is cauterized at the distal end of the treatment instrument. At the time of this cauterization, since a high-frequency signal with a high voltage and a large current is output from the high-frequency cautery device, unnecessary radiation waves are generated. Due to this influence, noise is superimposed on the captured image on the electrical signal output from the CCD in the endoscope 1 and the video signal transmitted through the video signal line 15 connecting the CCU 2 and the display device 4. This video signal is input to the display device 4. In the display device 4, noise suppression processing is performed by the following processing.

  The switch controller 13 can detect the drive of the high-frequency cautery device 3 by detecting the ON operation of the foot switch 5 based on a signal indicating that the foot switch is pressed. Thereby, during the drive period of the high-frequency cautery device 3, the switch controller 13 controls the switch 8 to cause the switch 8 to perform noise suppression processing by the corresponding notch filter 14. The video signal subjected to the noise suppression process is output to the display unit 11.

  Moreover, the switch controller 13 can also detect the stop of the high-frequency cauterization device 3 by detecting the OFF operation of the foot switch based on the signal indicating that the foot switch is pressed. During the stop period of the high-frequency cautery device 3, the switch controller 13 controls the switch 8 to output a video signal that does not pass through the noise suppression processing unit 9 to the display unit 11.

  Thus, during the cauterization treatment, the noise suppression process by the notch filter 14 can be executed inside the display device 4 in accordance with the ON / OFF operation of the foot switch 5. In this embodiment, since the noise suppression processing unit 9 is provided in the display device 4, noise superimposed on the front stage of the display device 4 (noise superimposed on the CCD and noise superimposed on the video signal line 15). ) Can be suppressed. Furthermore, by detecting the operation of the high-frequency cautery device 3, when the high-frequency cautery device 3 is not operating, an endoscopic image without unnecessary noise suppression processing can be observed.

  Note that the fourth embodiment may be applied to the third embodiment (Example 1). That is, in FIG. 11, the connection between the high frequency cautery device 3 and the display device 4 may be removed, and the foot switch 5 and the CCU may be connected by the communication line 16. At this time, the model information of the high-frequency cautery device 3 is preset in the switch controller 13. Thereby, at the time of cauterization, the noise suppression process by the notch filter 14 can be executed in the CCU 2 according to the ON / OFF operation of the foot switch 5.

  According to the first to fourth embodiments, the step of extracting the spatial frequency of noise that the conventional technology has becomes unnecessary, and the effect of suppressing the delay time can be obtained. Furthermore, there is an effect that a conventional endoscopic image can be obtained without performing unnecessary filter processing on an endoscopic image on which noise is not superimposed when the high frequency cautery apparatus is stopped. That is, with respect to the display image on which the endoscopic image is displayed, the noise incurred by the high-frequency ablation device is suppressed with minimal delay and the influence on the observation image is suppressed as much as possible. It is possible to prevent the image from being affected by noise processing.

  Thus, the noise removal apparatus according to the first, third, or fourth embodiment includes an acquisition unit, a filtering unit, a detection unit, a switching unit, and an output unit. The acquisition unit acquires a video signal based on an observation image obtained by an endoscope. For example, the acquisition unit corresponds to the video I / F 7 or the signal I / F 21 in the above embodiment.

  The filtering unit attenuates a specific frequency component included in the video signal by filtering. For example, the filtering unit corresponds to the noise suppression processing unit 9 in the above embodiment.

The detection unit detects the driving operation of the treatment apparatus that performs the cauterization treatment. The detection unit corresponds to the switch controller 13 in the above embodiment, for example.
The switching unit switches ON / OFF of the filter processing for the video signal according to whether or not the driving operation of the treatment device is detected as a result of the detection. For example, the switching unit corresponds to the switch 8 in the above embodiment.

The output unit outputs the acquired video signal or the filtered video signal. For example, in the above embodiment, the output unit corresponds to the display unit 11 or the video I / F 23.
With this configuration, it is possible to perform noise suppression processing for attenuating a specific frequency component included in the video signal of the endoscopic observation image only under a situation where unnecessary radiated radio waves are generated.

  In addition, when the detection unit detects a signal indicating that the treatment device is driven, the switching unit controls the filtering unit to perform the filtering process on the acquired video signal, and after the filtering process Are output to the output unit. When the signal indicating that the treatment device is driving is not detected by the detection unit, the switching unit outputs the acquired video signal to the output unit.

  With this configuration, by detecting the operation of the high-frequency ablation device 3, when the high-frequency ablation device 3 is not operating, an endoscopic image without unnecessary noise suppression processing can be observed.

  The noise removal apparatus further includes an operation signal acquisition unit. The operation signal acquisition unit acquires a signal indicating that the treatment device is driven to operate from the treatment device or a foot switch that instructs driving of the treatment device. For example, the operation signal acquisition unit corresponds to the communication I / F 12 in the above embodiment.

The noise removing device may be provided by a display device, a camera control unit, or an endoscope system.
The noise removal device according to the second or third embodiment includes an acquisition unit, a filtering unit, a detection unit, a switching unit, and an output unit. The acquisition unit acquires a video signal based on an observation image obtained by an endoscope. For example, the acquisition unit corresponds to the video I / F 7 or the signal I / F 21 in the above embodiment.

  The filtering unit attenuates a specific frequency component included in the video signal by filtering. For example, the filtering unit corresponds to the noise suppression processing unit 9 in the above embodiment.

The detection unit detects a specific frequency component included in the video signal. For example, the detection unit corresponds to the noise detection unit 18 in the above embodiment.
The switching unit switches ON / OFF of the filter processing for the video signal according to whether the video signal includes a specific frequency component as a result of the detection. For example, the switching unit corresponds to the switch 8 in the above embodiment.

The output unit outputs the acquired video signal or the filtered video signal. For example, in the above embodiment, the output unit corresponds to the display unit 11 or the video I / F 23.
With this configuration, it is possible to perform noise suppression processing for attenuating a specific frequency component included in the video signal of the endoscopic observation image only under a situation where unnecessary radiated radio waves are generated.

  Further, when the specific frequency component included in the video signal is detected by the detection unit, the switching unit controls the filtering unit to perform a filtering process on the acquired video signal, and after the filtering process The video signal is output to the output unit. When the specific frequency component included in the video signal is not detected by the detection unit, the switching unit outputs the acquired video signal to the output unit.

With this configuration, when the noise superimposed on the video signal is so weak that it cannot be detected, it is possible to observe an endoscopic image that has not been filtered.
The detection unit includes one or more bandpass filters and a determination unit. The band-pass filter passes the video signal having a frequency band corresponding to the driving frequency of the treatment device. The band pass filter corresponds to the band pass filter 19 in the above embodiment. The determination unit determines whether the level of the video signal that has passed through the bandpass filter is equal to or greater than a predetermined threshold. The determination unit corresponds to the noise determination unit 20 in the above embodiment.

With this configuration, it is possible to detect noise superimposed on the video signal.
The noise removing device may be provided by a display device, a camera control unit, or an endoscope system.

  The present invention is not limited to the above-described embodiment, and various configurations or embodiments can be taken without departing from the gist of the present invention.

1 Endoscope 2 CCU
3 Induction Ablation Device 4 Display Device 5 Foot Switch 6 Code 7 Video I / F
8 Switch 9 Noise suppression processing unit 10 Video processing unit 11 Display unit 12 Communication I / F
DESCRIPTION OF SYMBOLS 13 Switch controller 14 Notch filter 15 Video signal line 16 Communication line 17 Divider 18 Noise detection part 19 Band pass filter 20 Noise judgment part 21 Signal I / F
22 Video signal generator 23 Video I / F

Claims (12)

An acquisition unit for acquiring a video signal based on an observation image obtained by an endoscope;
A filtering unit that attenuates a specific frequency component included in the video signal by filtering;
A detection unit that detects the drive operation of the treatment device that performs cauterization;
As a result of the detection, a switching unit that switches ON / OFF of the filter processing for the video signal according to whether or not the driving operation of the treatment device is detected;
An output unit for outputting the acquired video signal or the filtered video signal;
A noise removing device comprising: When the signal indicating that the treatment device is driven is detected by the detection unit, the switching unit controls the filtering unit to perform the filtering process on the acquired video signal, and the image after the filtering process Output the signal to the output unit,
2. The noise according to claim 1, wherein the switching unit outputs the acquired video signal to the output unit when the detection unit does not detect a signal indicating that the treatment apparatus is driven. Removal device. The noise removing device further includes:
The noise removal apparatus according to claim 2, further comprising: an operation signal acquisition unit that acquires a signal indicating that the treatment apparatus performs a driving operation from the treatment apparatus or a foot switch that instructs driving of the treatment apparatus. .   A display apparatus provided with the noise removal apparatus of any one of Claims 1-3.   A camera control unit comprising the noise removal device according to claim 1.   An endoscope system provided with the noise removal apparatus of any one of Claims 1-3. An acquisition unit for acquiring a video signal based on an observation image obtained by an endoscope;
A filtering unit that attenuates a specific frequency component included in the video signal by filtering;
A detection unit for detecting a specific frequency component included in the video signal;
As a result of the detection, a switching unit that switches ON / OFF of filter processing for the video signal according to whether or not the video signal includes a specific frequency component;
An output unit for outputting the acquired video signal or the filtered video signal;
A noise removing device comprising: When the specific frequency component included in the video signal is detected by the detection unit, the switching unit controls the filtering unit to perform a filtering process on the acquired video signal, and the video signal after the filtering process Is output to the output unit,
The noise removal according to claim 7, wherein when the specific frequency component included in the video signal is not detected by the detection unit, the switching unit outputs the acquired video signal to the output unit. apparatus. The detection unit includes one or more band-pass filters that pass the video signal having a frequency band corresponding to a driving frequency of the treatment device;
A determination unit that determines whether the level of the video signal that has passed through the bandpass filter is equal to or higher than a predetermined threshold;
The noise removal apparatus according to claim 7 or 8, further comprising:   A display apparatus provided with the noise removal apparatus of any one of Claims 7-9.   A camera control unit comprising the noise removal device according to claim 7. An endoscope system provided with the noise removal apparatus of any one of Claims 7-9.