WO2022172574A1 - 内視鏡システム、及び内視鏡システムの作動方法 - Google Patents
内視鏡システム、及び内視鏡システムの作動方法 Download PDFInfo
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Definitions
- the present invention relates to an endoscope system that saves still images and a method of operating the endoscope system.
- an image (hereinafter referred to as an endoscopic image) obtained by photographing an observation object, which is a subject, with an endoscope can be saved as a still image.
- a still image is used for display on a display, attachment to a medical report, or the like, and is useful for diagnosis.
- endoscopes do not have an autofocus function.
- the user himself/herself operates the endoscope and adjusts the distance to the subject, thereby obtaining an optimally focused still image.
- the user since the subject of the endoscope is an internal organ, the user appropriately adjusts the distance between the distal end of the endoscope 12 and the subject 91 to be the distance db, and focuses on the internal organs.
- the object 91 may move, for example, by a distance dm due to pulsation, peristalsis, or the like.
- the distance between the endoscope 12 and the subject 91 becomes the distance db+c, away from the in-focus distance db, and the resulting image is out of focus.
- the photographing conditions such as the distance to the object unexpectedly change, making it difficult to obtain an optimally focused still image.
- An object of the present invention is to provide an endoscope system and an operation method of the endoscope system that can easily acquire an optimal still image according to changes in imaging conditions.
- the present invention is an endoscope system comprising an endoscope for photographing a subject and a processor, the endoscope having a pointing section, and the processor for obtaining an endoscope by photographing the subject with the endoscope.
- a mirror image is acquired for each frame, and an endoscopic image selected based on the first selection condition or the second selection condition is temporarily stored in a temporary storage area, and each of the temporarily stored images temporarily stored in the temporary storage area is stored.
- an image evaluation value is given by performing image evaluation, switching between the first selection condition and the second selection condition based on the selection condition switching instruction, and based on the still image storage instruction, the image evaluation value is obtained from the temporarily stored image
- the selected optimum still image is stored, and the instruction unit instructs switching of selection conditions and still image storage.
- the processor preferably temporarily saves the endoscopic image selected based on the first selection condition when starting to acquire the endoscopic image.
- the instruction unit performs the first action and the second action, and instructs to save the still image by the second action.
- the instruction unit includes a momentary switch, the first action is pressing the momentary switch, and the second action is releasing the pressed momentary switch.
- the instruction unit includes an alternate switch, the first action is pressing and releasing the alternate switch for the first time, and the second action is pressing and releasing the alternate switch for the second time.
- the processor measures a period from the first action to the second action, and if the period is equal to or longer than a preset determination period, the instruction unit issues a selection condition switching instruction when the determination period has elapsed from the first action. is preferred.
- the instruction unit preferably issues a selection condition switching instruction when the processor temporarily stores the endoscopic image based on the second selection condition when the still image storage instruction is issued.
- the processor temporarily stores the selected endoscopic images in the temporary storage area in a number equal to or less than a preset maximum number of temporarily stored images, and the first selection condition is that the number of temporarily stored images is less than the maximum number in the temporary storage area. If they have been saved, the first A selection condition is to temporarily save the endoscopic images as temporarily saved images in the temporary save area until the maximum number of images is reached in the order of the latest photographing time, and the maximum number of temporarily saved images are temporarily saved in the temporary save area.
- the 1B selection condition is to delete the temporarily stored image with the oldest shooting time among the temporarily stored images temporarily stored in the temporary storage area from the temporary storage area, and then delete the image with the shooting time It is preferable to temporarily store the endoscopic images in the temporary storage area in the order of newest as the temporarily stored images.
- the processor temporarily stores the selected endoscopic images in the temporary storage area in a number equal to or less than a preset maximum number of temporarily stored images, and the second selection condition is that the number of temporarily stored images is less than the maximum number in the temporary storage area. If they are saved, the 2A selection condition is to temporarily save endoscopic images as temporarily saved images in the temporary save area until the maximum number of images is reached in the order of the latest photographing time, and temporarily save the maximum number of temporarily saved images. If it is temporarily stored in the area, as the second B selection condition, only the appropriate still image selected by the image evaluation value from the temporarily stored image is left in the temporary storage area as the temporary storage image, and the image other than the appropriate image is stored in the temporary storage area. is deleted, and performing the 2nd A selection condition is preferably included.
- the processor temporarily stores the selected endoscopic images in the temporary storage area in a number equal to or less than a preset maximum number of temporarily stored images, and the second selection condition is that the number of temporarily stored images is less than the maximum number in the temporary storage area. If they are saved, the 2A selection condition is to temporarily save endoscopic images as temporarily saved images in the temporary save area until the maximum number of images is reached in the order of the latest photographing time, and temporarily save the maximum number of temporarily saved images.
- a display for displaying the optimum still image and/or the appropriate still image and if the display displays the optimum still image and/or the appropriate still image, the display is updated to display the latest optimum still image and/or the appropriate still image. It is preferable to display a picture.
- the display has a main screen and a sub-screen, and the optimum still image is displayed on the main screen for a preset display period, and displayed on the sub-screen after the display period.
- the display updates and displays the optimum still image and/or the appropriate still image
- the notification unit notifies the user of the switching.
- the notification unit preferably does not notify the user when the notification to the user is performed again within the preset minimum notification period.
- the processor evaluates the contrast and/or brightness of the temporarily stored image, and the image evaluation value is a value related to the contrast and/or brightness of the temporarily stored image.
- the processor performs image evaluation on the degree of certainty and/or the degree of malignancy regarding a specific lesion that the subject captured in the temporarily stored image has, and the image evaluation value is the degree of certainty and/or the degree of malignancy.
- the processor sets a threshold for image evaluation values, and if an image evaluation value equal to or greater than the threshold is assigned to a temporarily stored image, it is assumed that a still image storage instruction has been issued, and the temporarily stored image to which an image evaluation value equal to or greater than the threshold is assigned is deemed to have been issued. It is preferable to save it as an optimal still image.
- the instruction section preferably includes a freeze operation section.
- the present invention is a method of operating an endoscope system comprising an endoscope having a pointing section for photographing a subject and a processor, wherein the processor captures an endoscopic image obtained by photographing the subject with the endoscope. is acquired for each frame, and the endoscopic image selected based on the first selection condition or the second selection condition is temporarily stored in the temporary storage area as a temporary storage image, and the temporary storage image temporarily stored in the temporary storage area An image evaluation value is assigned to each image by performing image evaluation, switching between the first selection condition and the second selection condition based on the selection condition switching instruction, and image evaluation from the temporarily stored image based on the still image storage instruction. The optimal still image selected by the value is saved, and the instruction unit instructs switching of the selection condition and still image saving instruction.
- FIG. 1 is an external view of an endoscope system;
- FIG. 1 is a block diagram showing functions of an endoscope system;
- FIG. It is an explanatory view explaining four colors of LED which a light source part includes.
- 4 is a graph showing spectra of violet light V, blue light B, green light G, and red light R;
- 4 is a block diagram showing functions of an image storage unit;
- FIG. 4 is a flow chart showing a series of flows for saving an optimum still image. It is an explanatory view explaining the 1A selection conditions. It is an explanatory view explaining 1B selection conditions.
- FIG. 11 is an explanatory diagram for explaining the first half of the 2B selection condition and the 2C selection condition;
- FIG. 11 is an explanatory diagram for explaining the second half of the 2B selection condition;
- FIG. 11 is an explanatory diagram for explaining the second half of the 2C selection condition;
- FIG. 11 is an explanatory diagram for explaining a still image save instruction performed under the 2B selection condition;
- FIG. 11 is an explanatory diagram for explaining a still image saving instruction performed under the 2C selection condition;
- FIG. 11 is an explanatory diagram illustrating acquisition of an optimum still image by single-pressing a freeze switch;
- FIG. 11 is an explanatory diagram illustrating acquisition of an optimum still image by long-pressing a freeze switch;
- FIG. 10 is an explanatory diagram of temporarily stored images acquired every other frame;
- FIG. 11 is an explanatory diagram for explaining a case where a threshold value of an image evaluation value is used;
- FIG. 4 is an explanatory diagram illustrating an example of displaying an optimum still image on a display
- FIG. 11 is an explanatory diagram illustrating a case where an update of an optimum still image is displayed on a display and notified
- FIG. 4 is an explanatory diagram illustrating a case where the focus of an endoscopic image changes
- the endoscope system 10 has an endoscope 12, a light source device 14, a processor device 16, a display 18, and a keyboard 19.
- the endoscope 12 is optically connected to the light source device 14 and electrically connected to the processor device 16 .
- the endoscope 12 includes an insertion section 12a inserted into the body of a subject having an observation target as a subject, an operation section 12b provided at the proximal end portion of the insertion section 12a, and an operation section 12b provided at the proximal end portion of the insertion section 12a. It has a curved portion 12c and a tip portion 12d provided.
- the bending portion 12c is bent by operating the angle knob 12e of the operation portion 12b.
- the distal end portion 12d is directed in a desired direction by the bending motion of the bending portion 12c.
- the operation unit 12b has a freeze operation unit 12f for issuing a selection condition switching instruction, a still image saving instruction, etc., which will be described later, and a zoom operation unit 12g for changing the imaging magnification.
- still image storage instructions or zoom operations are performed using the scope switches of the freeze operation section 12f or the zoom operation section 12g, switches of the processor device 16, the keyboard 19, foot switches (not shown), or the like. It may be an operation or an instruction.
- the processor device 16 is electrically connected to the display 18 and keyboard 19 .
- the display 18 outputs and displays moving or still endoscopic images and/or information incidental to these images.
- the keyboard 19 functions as a user interface that receives input operations such as function settings.
- the processor device 16 may be connected to an external recording unit (not shown) for recording images, image information, and the like.
- the light source device 14 emits illumination light to irradiate an observation target, and includes a light source unit 20 and a light source processor 21 that controls the light source unit 20 .
- the light source unit 20 is composed of, for example, a semiconductor light source such as a multicolor LED (Light Emitting Diode), a combination of a laser diode and a phosphor, or a xenon lamp or halogen light source.
- the light source unit 20 also includes an optical filter and the like for adjusting the wavelength band of light emitted by the LED or the like.
- the light source processor 21 controls the amount of illumination light by turning on/off each LED or the like and adjusting the driving current or driving voltage of each LED or the like.
- the light source processor 21 also controls the wavelength band of the illumination light by changing the optical filter or the like.
- the light source unit 20 includes a V-LED (Violet Light Emitting Diode) 20a, a B-LED (Blue Light Emitting Diode) 20b, a G-LED (Green Light Emitting Diode) 20c, and R-LED (Red Light Emitting Diode) 20d.
- V-LED Volt Light Emitting Diode
- B-LED Blue Light Emitting Diode
- G-LED Green Light Emitting Diode
- R-LED Red Light Emitting Diode
- the V-LED 20a generates violet light V with a central wavelength of 410 ⁇ 10 nm and a wavelength range of 380-420 nm.
- the B-LED 20b generates blue light B with a central wavelength of 450 ⁇ 10 nm and a wavelength range of 420-500 nm.
- the G-LED 20c generates green light G with a wavelength range of 480-600 nm.
- the R-LED 20d emits red light R with a central wavelength of 620-630 nm and a wavelength range of 600-650 nm.
- the light source processor 21 controls the V-LED 20a, B-LED 20b, G-LED 20c, and R-LED 20d.
- the light source processor 21 emits illumination light having different combinations of light intensity ratios among violet light V, blue light B, green light G, and red light R according to a plurality of observation modes. It controls the LEDs 20a-20d.
- the light emitted by each of the LEDs 20a to 20e is incident on the light guide 41 via an optical path coupling section (not shown) composed of mirrors, lenses, and the like.
- the light guide 41 is built in the endoscope 12 and the universal cord (the cord connecting the endoscope 12, the light source device 14 and the processor device 16).
- the light guide 41 propagates the light from the optical path coupling portion to the distal end portion 12 d of the endoscope 12 .
- the distal end portion 12d of the endoscope 12 is provided with an illumination optical system 30a and an imaging optical system 30b.
- the illumination optical system 30 a has an illumination lens 42 , and the illumination light propagated by the light guide 41 is applied to the observation target via the illumination lens 42 .
- the imaging optical system 30 b has an objective lens 43 , a zoom lens 44 and an imaging sensor 45 .
- Various kinds of light such as reflected light, scattered light, and fluorescent light from the observation target enter the imaging sensor 45 via the objective lens 43 and the zoom lens 44 .
- an image of the observation target is formed on the imaging sensor 45 .
- the zoom lens 44 can be freely moved between the telephoto end and the wide end by operating the zoom operation section 12g to enlarge or reduce the observation target imaged on the imaging sensor 45 .
- the imaging sensor 45 is a color imaging sensor in which any one of R (red), G (green), or B (blue) color filters is provided for each pixel. to output As the imaging sensor 45, a CCD (Charge Coupled Device) imaging sensor or a CMOS (Complementary Metal-Oxide Semiconductor) imaging sensor can be used. Further, instead of the imaging sensor 45 provided with primary color filters, a complementary color imaging sensor provided with complementary color filters of C (cyan), M (magenta), Y (yellow) and G (green) may be used. . When a complementary color imaging sensor is used, CMYG four-color image signals are output.
- CCD Charge Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- CMYG four-color image signal into the RGB three-color image signal by complementary color-primary color conversion
- RGB image signal similar to that of the image sensor 45 can be obtained.
- a monochrome sensor without a color filter may be used instead of the imaging sensor 45.
- a CDS/AGC (Correlated Double Sampling/Automatic Gain Control) circuit 46 performs correlated double sampling (CDS) and automatic gain control (AGC) on analog image signals obtained from the imaging sensor 45 .
- the image signal that has passed through the CDS/AGC circuit 46 is converted into a digital image signal by an A/D (Analog/Digital) converter 47 .
- the digital image signal after A/D conversion is input to the processor device 16 .
- a central control unit 59 configured by a processor operates a program in a program memory to perform an image acquisition unit 51, a noise reduction unit 53, a signal processing unit 55, and an image storage unit. 56, a display control unit 57, a video signal generation unit 58, a central control unit 59, and the like are realized.
- the central control unit 59 receives information from the endoscope 12 such as the freeze operation unit 12f, and controls each unit of the processor device 16 such as the image storage unit 56 based on the received information. It controls the mirror 12 or the light source device 14 . It also receives information such as instructions from the keyboard 19 .
- the image acquisition unit 51 acquires, for each frame, a digital image signal of an endoscopic image obtained by photographing a subject, which is an observation target illuminated by illumination light, with the endoscope 12 .
- a "frame” is a unit for controlling the imaging sensor 45 (see FIG. 2) that captures an image of an object.
- the acquired image signal is sent to the DSP 52.
- the DSP 52 performs digital signal processing such as color correction processing on the received image signal.
- the noise reduction unit 53 performs noise reduction processing using, for example, a moving average method, a median filter method, or the like on the image signal that has been subjected to color correction processing or the like by the DSP 52 .
- the noise-reduced image signal is stored in the memory 54 .
- the signal processing unit 55 acquires the image signal after noise reduction from the memory 54 . Then, the acquired image signal is subjected to signal processing such as color conversion processing, color enhancement processing, and structure enhancement processing as necessary to generate a color endoscopic image showing the observation target.
- the image storage unit 56 performs image storage processing for storing images.
- the display control unit 57 controls display of images or information on the display 18, which is display means. For example, it performs control to display an endoscopic image on the display 18 in real time, or control to display a saved still image in a set area such as a sub-screen of the display 18 .
- the video signal generation unit 58 converts various endoscopic images output from the display control unit 57 into video signals that can be displayed in full color on the display 18 .
- the converted video signal is input to display 18 .
- the display 18 displays an endoscopic image or various information in the form of text or the like.
- the image storage unit 56 includes a temporary storage unit 61, an image evaluation unit 62, and an optimal still image storage unit 63.
- the temporary storage unit 61 includes a selection condition switching instruction reception unit 71 , a selection condition switching unit 72 and a temporary storage area 73 .
- the temporary storage unit 61 temporarily stores the endoscopic image selected based on the selection condition in the temporary storage area 73 as a temporarily stored image.
- the selection condition is a condition for selecting an endoscopic image to be temporarily stored in the temporary storage area 73 from among the endoscopic images acquired by the image acquisition unit 51 for each frame.
- the selection conditions include two types of first selection conditions and second selection conditions.
- the selection condition is switched by the selection condition switching unit 72 based on the selection condition switching instruction accepted by the selection condition switching instruction accepting unit 71 .
- the temporary storage area 73 has a memory function for temporarily storing endoscopic images and has a certain capacity.
- the selection condition switching instruction receiving unit 71 receives a selection condition switching instruction.
- the selection condition switching instruction is an instruction to switch the selection condition from the first selection condition to the second selection condition, or from the second selection condition to the first selection condition. This is an instruction to switch the selection condition when temporarily saving the temporarily saved image in the temporary saving area 73 .
- the selection condition switching instruction receiving portion 71 receives the selection condition switching instruction, the selection condition switching portion 72 switches the selection condition. If there is no selection condition switching instruction, the selection conditions are not switched, and the selection conditions up to that point are continued.
- An instruction unit issues a selection condition switching instruction and a still image saving instruction, which will be described later. The selection condition switching instruction and the still image storage instruction performed by the instruction unit will be described later.
- the image evaluation unit 62 assigns an image evaluation value to each of the temporarily stored images by performing image evaluation on each of the temporarily stored images temporarily stored in the temporary storage area 73 .
- the image evaluation unit 62 includes a contrast evaluation unit 74 , a brightness evaluation unit 75 , a certainty evaluation unit 76 and a malignancy evaluation unit 77 .
- the temporarily stored image to which the image evaluation value is assigned is stored in the temporary storage area 73 .
- Image evaluation is an evaluation performed based on temporarily stored images, and is performed by calculating an image evaluation value through image analysis of the feature values of temporarily stored images, or by using a trained machine learning model.
- a method of assigning various values to the saved image as image evaluation values can be used.
- the image evaluation unit 62 evaluates the contrast and/or brightness of the temporarily stored image, and the image evaluation value can be a value related to the contrast and/or brightness of the temporarily stored image.
- the contrast evaluation unit 74 evaluates the contrast of each temporarily stored image and assigns a contrast evaluation value to the corresponding temporarily stored image.
- the brightness evaluation unit 75 performs image evaluation on the brightness of each temporarily stored image, and assigns a brightness evaluation value to the corresponding temporarily stored image.
- the image evaluation unit 62 performs image evaluation on the degree of certainty and/or the degree of malignancy related to a specific disease, etc., for the lesions of the subject captured in the temporarily stored image. , or values for these.
- the certainty evaluation unit 76 performs image evaluation on the certainty of a specific disease for each of the temporarily stored images, and assigns a certainty evaluation value to the corresponding temporarily stored image.
- the malignancy evaluation unit 77 performs image evaluation on the degree of malignancy related to a specific disease for each temporarily stored image, and assigns a malignancy evaluation value to the corresponding temporarily stored image.
- the contrast evaluation unit 74, the brightness evaluation unit 75, the certainty evaluation unit 76, the malignancy evaluation unit 77, and the like included in the image evaluation unit 62 can perform image evaluation by using known methods.
- the contrast evaluation value given to the temporarily stored image by the contrast evaluation unit 74 indicates that the higher the value, the more focused or focused the image, and the lower the value, the greater the blur or blur, or the image that is out of focus or out of focus. It can be said that Therefore, it is possible to select the endoscopic image with the best degree of focus from among the temporarily stored images based on the contrast evaluation value.
- the higher the certainty evaluation value by the certainty evaluation unit 76 the higher the degree of certainty that the characteristic portion of the subject includes a specific disease or the like in the endoscopic image. It can be said that the higher the malignancy evaluation value by the unit 77 is, the higher the malignancy of a specific lesion or the like is in the characteristic part included in the object.
- the image evaluation value is not limited to these examples.
- two or more of contrast, brightness, certainty, and malignancy may be evaluated together. It is not necessary to assign the image evaluation values of the above as individually calculated image evaluation values.
- the optimal still image storage unit 63 includes a still image storage instruction reception unit 78 and an optimal still image storage area 79 . Based on the still image storage instruction received by the still image storage instruction receiving unit 78, the optimal still image storage unit 63 stores the optimal still image selected from the temporarily stored images based on the image evaluation value in the optimal still image storage area 79.
- An optimal still image is a still image that is suitable as a still image to be saved, for example, a still image that has an appropriate focus or brightness, or that includes a characteristic area such as a lesion.
- the optimum still image is a still image selected from the temporarily stored images temporarily stored in the temporary storage area 73 based on the image evaluation value as the still image having the optimum focus and the like.
- the still image storage instruction reception unit 78 receives a still image storage instruction.
- a still image storage instruction is issued by the instruction unit.
- the instruction unit issues a selection condition switching instruction and a still image saving instruction. Therefore, it is preferable that the instruction unit performs the first action and the second action.
- the first action and the second action are different actions by the instruction section. With the first operation and the second operation, even if the instruction unit is, for example, a single switch, different instructions can be issued between the selection condition switching instruction and the still image saving instruction.
- the instruction unit is an operation unit that performs instruction operations. Instructions by operating the operation unit are controlled by the control unit.
- the operation unit for performing the instruction operation can be the freeze operation unit 12f provided in the operation unit 12b of the endoscope 12.
- FIG. A central control unit 59 can be used as a control unit that controls instructions by operation.
- the freeze operation unit 12f is a freeze switch among various scope switches of the endoscope 12, which is also called a scope.
- a selection condition switching instruction and a still image saving instruction are performed by the user operating the freeze operation unit 12f.
- the instruction unit can also be other than the freeze operation unit 12f, for example, a foot switch (not shown) connected to the processor device 16, a remote switch (not shown), or various switches provided in the processor device 16 good too.
- the freeze operation unit 12f may perform the first action and the second action by using a momentary type switch or an alternate type switch.
- the first action may be pressing the momentary switch
- the second action may be releasing the pressed momentary switch.
- the freeze operation unit 12f is a momentary type freeze switch
- the user continues the first action of pressing the freeze switch, and when it is determined that the user has pressed the freeze switch for a long time, the selection condition switching instruction is given. is done. Further, the action of the user stopping pressing the freeze switch to release the switch may be the second action, and the still image saving instruction may be issued when the freeze switch is released from being pressed.
- the freeze operation unit 12f is an alternate switch
- the same is true for the momentary switch. It can be defined as pressing and releasing the second time.
- the freeze operation unit 12f is a freeze switch of an alternate type switch
- the user presses the freeze switch once to turn the switch on, and it is determined that the switch is held on for a long time.
- the first operation is the case where the button is pressed, and the selection condition switching instruction is performed when the long press is performed, which is the first operation.
- the operation of turning off the switch by pressing the freeze switch for the second time by the user is defined as the second operation, and when the freeze switch is pressed for the second time, a still image saving instruction can be performed.
- the determination of long press can be as follows.
- the operation of the freeze operation section 12f is transmitted to the central control section 59 of the processor device 16.
- FIG. The central control unit 59 receives and determines the operation of the freeze operation unit 12f.
- the freeze operation unit 12f cooperates with the central control unit 59, and when the freeze operation unit 12f is a momentary switch, measures the period from the first operation to the second operation, and when the period is equal to or longer than the preset determination period , the selection condition switching instruction is issued to the selection condition switching instruction reception unit 71 when the determination period has elapsed from the first operation.
- the freeze operation unit 12f is an alternate type switch
- the time from the first depression and release, which is the first action is measured, and if this time is equal to or longer than a predetermined judgment period, the judgment period from the first action is When the period has elapsed, a selection condition switching instruction is issued to the selection condition switching instruction receiving portion 71 .
- the instruction section is other than the freeze operation section 12f, by using a momentary type switch or an alternate type switch as the instruction section, two types of instructions, a selection condition switching instruction and a still image saving instruction, can be performed. can be preferably performed.
- the user obtains an endoscopic image by photographing an observation target, which is a subject, with the endoscope 12 .
- the image acquisition unit 51 acquires an endoscopic image for each frame (step ST100). Note that the image acquiring unit 51 acquires endoscopic images in order of photographing time. Then, an image evaluation value is assigned to the temporarily stored image selected according to the first selection condition, and this is repeated (step ST110).
- the temporary storage unit 61 preferably temporarily stores the endoscopic image selected based on the first selection condition when the image acquiring unit 51 starts acquiring endoscopic images.
- the endoscopic images may be temporarily stored in the temporary storage area 73 in order of imaging time in a first-in-first-out (FIFO) manner. It is preferable that the selected endoscopic images are temporarily stored in the temporary storage area 73 in a number equal to or less than the preset maximum number of images as temporarily stored images.
- the first selection condition can comprise a first A selection condition and a first B selection condition. If the number of temporarily stored images is less than the maximum number and the temporarily stored images are temporarily stored in the temporary storage area 73, the first A selection condition is used. Under the 1A selection condition, the endoscopic images are temporarily stored in the temporary storage area 73 as images to be temporarily stored until the maximum number of endoscopic images is reached in the order of the latest photographing time. When the maximum number of temporarily stored images are temporarily stored in the temporary storage area 73, the 1B selection condition is used. In the 1B selection condition, the temporarily stored image with the oldest shooting time among the temporarily stored images temporarily stored in the temporary storage area 73 is deleted from the temporary storage area, and then the endoscopic images are temporarily stored in the order of the newest shooting time.
- the image is temporarily stored in the temporary storage area 73, and these operations are repeated.
- the first-in first-out method in the 1B selection condition it is possible to prevent the number of temporarily stored images temporarily stored in the temporary storage area 73 from exceeding the preset maximum number.
- the 1A selection condition is used.
- the endoscopic images are temporarily stored in the order of the latest imaging time until the number of temporarily stored images reaches the maximum number of 5.
- Temporarily save in the save area 73 when the endoscopic image is started at time t1, at time t3, the temporary storage area 73 contains the endoscopic image captured at time t1 to the endoscopic image captured at time t3. Temporarily saved. Subsequently, temporarily stored images are temporarily stored in the temporary storage area 73 in the order in which the endoscopic images are acquired until the number of temporarily stored images reaches the maximum number of five images.
- the 1B selection condition is used.
- the maximum number of temporarily stored images are temporarily stored in the temporary storage area 73, so the number of temporarily stored images that does not exceed the maximum number of images is always temporarily stored in the temporary storage area 73 by the first-in, first-out method. be saved. Therefore, when an endoscopic image is acquired at time t6, the endoscopic image captured at time t1 is deleted from the temporary storage area 73, and then the latest endoscopic image captured at time t6 is stored in the temporary storage area. Temporarily save to 73. In FIG. 8, the images to be deleted are shaded. In this way, the number of temporarily stored images stored in the temporary storage area 73 does not exceed the preset maximum number, so an increase in memory capacity can be prevented.
- An image evaluation value is assigned by the image evaluation unit 62 to each of the temporarily stored images temporarily stored in the temporary storage area 73 .
- the contrast evaluation unit 74 evaluates the contrast of each temporarily stored image and assigns a contrast evaluation value to the corresponding temporarily stored image. It can be said that the higher the contrast evaluation value, the more in-focus the endoscopic image, and the lower the contrast evaluation value, the more out-of-focus the endoscopic image is.
- the selection condition is switched to the second selection condition (step ST140).
- the selection condition switching instruction is issued by the instruction unit as described above.
- the instruction unit includes the freeze operation unit 12f of the endoscope 12, and when the freeze operation unit 12f is long pressed, a selection condition switching instruction is issued. The case where there is no selection condition switching instruction (NO in step ST120) will be described later.
- an image evaluation value is assigned to the temporarily stored image selected according to the second selection condition, and this is repeated (step ST150).
- the second selection condition can comprise a second A selection condition and a second B selection condition.
- the second A selection condition is the same as the first A selection condition. If the number of temporarily stored images is less than the maximum number and the temporarily stored images are temporarily stored in the temporary storage area 73, the second A selection condition is used. Under the 2A selection condition, endoscopic images are temporarily stored in the temporary storage area 73 as temporarily stored images until the maximum number of endoscopic images is reached in the order of the latest imaging time. When the maximum number of temporarily stored images are temporarily stored in the temporary storage area 73, the second B selection condition is used.
- the 2B selection condition only the appropriate still image selected by the contrast evaluation value from the temporary storage image is left in the temporary storage area as the temporary storage image, and after deleting the image other than the appropriate image from the temporary storage area, the 2A Perform selection conditions.
- a suitable still image is a still image selected as a candidate for selecting the optimum still image. In this way, under the 2B selection condition, among the maximum number of temporarily stored images, for example, one appropriate still image is left based on the contrast evaluation value, the other temporarily stored images are deleted, and the temporarily stored images are again taken in order of shooting time.
- the temporarily stored image to be temporarily stored in the temporary storage area 73 is stored in advance by repeating the flow of leaving one appropriate still image based on the contrast evaluation value again. It is possible to prevent exceeding the set maximum number of sheets.
- a selection condition switching instruction is issued at time tn, and the selection condition switching unit 72 switches the selection condition from the first selection condition to the second selection condition.
- the second selection condition if the maximum number of temporarily stored images of five is temporarily stored in the temporary storage area 73, the second B selection condition is used. Whether to use the second A selection condition or the second B selection condition when it is determined to be a long press depends on how many temporarily stored images are stored in the temporary storage area 73 when it is determined to be a long press.
- the temporarily stored image having the highest contrast evaluation value is the endoscopic image.
- One mirror image Ptn+3 is selected as an appropriate still image.
- the endoscopic image Ptn+3 selected from the temporarily stored images, which are appropriate still images is shaded.
- the temporarily stored images other than the appropriate still images are deleted from the temporary storage area 73 .
- an endoscopic image Ptn+3, which is an appropriate still image captured at time tn+3, is temporarily stored in the temporary storage area 73 as the temporarily stored image.
- the endoscopic images captured from time tn+5 to time tn+8, which is the next imaging timing are temporarily stored in the temporary storage area 73 as temporarily stored images.
- the second B selection condition is performed. That is, the appropriate still image is selected based on the contrast evaluation value from the five temporarily stored images, which is the maximum number of images temporarily stored in the temporary storage area 73. In the case of FIG.
- One of the captured endoscopic images Ptn+7 is selected.
- the endoscopic image Ptn+3, which was the proper still image, and the endoscopic image Ptn+7, which was the new proper still image are shown with different shades.
- the update of the appropriate still image is continued while the freeze operation section 12f is pressed for a long time. In this manner, the appropriate still image is temporarily stored while being updated, so that a more appropriate still image can be acquired.
- the number of temporarily stored images stored in the temporary storage area 73 does not exceed the preset maximum number, it is possible to prevent an increase in memory capacity.
- the second selection condition can comprise a second A selection condition and a second C selection condition.
- the second A selection condition is used.
- the 2C selection condition when the maximum number of temporarily stored images are temporarily stored in the temporary storage area, only the appropriate still images selected by the contrast evaluation value from the temporarily stored images are temporarily stored in the temporary storage area as the temporarily stored images. After that, select the endoscopic image with the latest shooting time and temporarily save it in the temporary storage area as a temporary storage image. Temporarily save only the image as a temporary save image in the temporary save area.
- the 2C selection condition is repeated.
- the 2C selection condition among the maximum number of temporarily stored images, for example, one appropriate still image is left in the temporary storage area based on the contrast evaluation value, and another temporarily stored image is added again in order of shooting time.
- one appropriate still image is left, and one temporarily stored image is added again in order of shooting time. It is possible to prevent the number of temporarily stored images temporarily stored in 73 from exceeding a preset maximum number.
- the second C selection condition if the maximum number of temporarily stored images of 5 is temporarily stored in the temporary storage area 73, the second C selection condition may be used.
- the second C selection condition in the first half, as shown in FIG. 9, when the maximum number of 5 endoscopic images taken from time tn to time tn+4 are temporarily stored images, from these temporarily stored images A temporarily stored image with the best contrast evaluation value is selected as an appropriate still image. Of these temporarily stored images, the temporarily stored images other than the endoscopic image Ptn+3, which is an appropriate still image, are deleted from the temporary storage area 73 .
- the endoscopic image Ptn+3, which was the proper still image, and the endoscopic image Ptn+5, which was the new proper still image are shown with different shades.
- the appropriate still image captured at time tn+5 is temporarily stored in the temporary storage area
- the endoscopic image captured at time tn+6 (not shown), which is the next imaging timing, is temporarily stored as a temporarily stored image.
- the two images are temporarily saved. The flow of comparing the contrast evaluation values of the images is repeated. In this manner, the appropriate still image is temporarily stored while being updated, so that a more appropriate still image can be acquired.
- the number of temporarily stored images stored in the temporary storage area 73 does not exceed the preset maximum number, it is possible to prevent an increase in memory capacity.
- the optimum still image is selected from the temporarily stored images based on the image evaluation value (step ST170).
- An optimal still image is a still image that is suitable as a still image to save.
- a still image storage instruction is issued by the instruction unit as described above.
- the instruction unit includes the freeze operation unit 12f of the endoscope 12, so that a still image save instruction is issued when the pressing of the freeze operation unit 12f, which is the second operation, is released.
- the instruction to save the still image is performed by the second operation of the freeze operation section 12f, as described above.
- the operation of releasing the freeze switch that is the freeze operation unit 12f by the user is the second operation, and when the freeze switch is released, the still image saving instruction can be performed. .
- the freeze operation unit 12f is released by the still image saving instruction, and the still image saving instruction is issued. Since there are five temporarily stored images temporarily stored in the temporary storage area 73, one optimal still image is selected from the five temporarily stored images based on the contrast evaluation value.
- the five temporarily stored images include an endoscopic image Ptn+3 captured at time tn+3 and an endoscopic image Ptn+7 captured at time tn+7.
- the endoscopic image captured at time tn+3 is an endoscopic image with the highest contrast evaluation value among the five endoscopic images captured from time tn to time tn+4, and is a past appropriate still image. be.
- the endoscopic image Ptn+3, which was the proper still image, and the endoscopic image Ptn+7, which was the new proper still image, are shown with different shades.
- the 10 endoscopic images photographed from the time tn to the time tn+9 are obtained.
- the endoscopic image Ptn+7, which is the most focused endoscopic image, is selected as the optimum still image.
- the freeze operation unit 12f is released and the still image is temporarily stored when the still image storage instruction is issued. Since there are five temporarily stored images temporarily stored in the area 73, one optimal still image is selected from the five temporarily stored images based on the contrast evaluation value.
- the five temporarily stored images are endoscopic images captured from time tn to time tn+4, including an endoscopic image Ptn+3 captured at time tn+3.
- the endoscopic image Ptn+3 is a past appropriate still image that is the endoscopic image with the highest contrast evaluation value among the five endoscopic images captured from time tn to time tn+4.
- the endoscopic image Ptn+5 By comparing the contrast evaluation value between the endoscopic image Ptn+3 and the endoscopic image Ptn+5 acquired by the image acquiring unit 51 after instructing to save the still image, when the endoscopic image PTn+5 is selected, the time from time tn to time tn+5 is determined.
- the endoscopic image Ptn+3, which was an appropriate still image, and the endoscopic image Ptn+5 acquired after the instruction to save the still image are indicated by different shades.
- the optimum still image selected as described above is saved in the optimum still image saving area 79 (step ST180).
- the optimum still images saved in the optimum still image saving area 79 are still images with excellent image evaluation values.
- the optimum still image is an endoscopic image with excellent focusing. Therefore, the optimal still image is suitable for display on display 18 and for use in medical reports.
- the selection condition is switched from the second selection condition to the first selection condition (step ST190).
- the central control unit 59 instructs the selection condition switching instruction reception unit 71 to switch the selection condition if the temporary storage unit has temporarily stored the endoscopic image based on the second selection condition. instruct to do If acquisition of the endoscopic image is finished (YES in step ST200), observation by the endoscope is finished. If acquisition of the endoscopic image is not finished (NO in step ST200), the process returns to step ST100 and repeats from temporarily storing the endoscopic image according to the first selection condition.
- step ST120 If there is no selection condition switching instruction in step ST120 (NO in step ST120), the pressing by the freeze operation unit 12f is not determined to be a long press, and the period during which the freeze operation unit 12f continues to press is a long press. This is the case where it is determined that the single press is less than the determination time. In this case, since the freeze operation section 12f is released, a still image storage instruction is issued (step ST130), and the process proceeds to step ST170 for selecting the optimum still image. In step ST170 when the freeze operation unit 12f is single-pressed, the optimum still image is selected from the temporarily stored images selected according to the first selection condition.
- the endoscope system 10 can more reliably acquire the optimum still image at the timing intended by the user, for example, by the user's easy operation such as single-pressing or long-pressing the freeze switch. Even if the shooting environment changes such as a change in the distance between the distal end 12d of the endoscope and the object to be observed, the optimal still image can not be obtained immediately after pressing the freeze switch. To obtain an optimum still image by a simple operation of continuing to press and hold the freeze switch until a suitable still image is obtained, and releasing the freeze switch when the optimum still image is obtained. can be done.
- the endoscope system 10 switches the selection condition between the first selection condition and the second selection condition. Even if the mirror image is not obtained, the freeze operation unit 12f is kept pressed until the endoscope image with the best focus is obtained. can be obtained more easily and reliably.
- the vertical axis is the shooting distance and the horizontal axis is the time t.
- the photographing distance is the distance between the distal end portion 12d of the endoscope and the subject, and the distance db is used as a reference in the graph.
- the distance db is the distance at which the best focused image is obtained (see FIG. 20).
- the subject is the object to be observed by the endoscope 12 and is located in the lumen of the subject, for example, even if the position of the distal end portion 12d of the endoscope 12 is fixed, the pulsation, peristalsis, or the like causes time-lapse.
- the shooting distance may vary regularly with t.
- the temporarily stored image is temporarily stored according to the first selection condition.
- the temporarily stored images are temporarily stored in the temporary storage area 73 with a maximum number of 5 images. Since the first selection condition was the first-in, first-out method, five images are temporarily saved from time t6 when the freeze operation unit 12f was released.
- the acquired saved still image Pt2 is acquired as the optimum still image.
- the endoscopic image acquired at time t1 which is deleted when the endoscopic image acquired at time t6 becomes the temporarily stored image, and the endoscopic image acquired at time t2 are shown. , indicated by different shading.
- endoscopic images with excellent focusing are obtained during the period when the maximum number of images is obtained.
- excellent endoscopic images may not be obtained during the period when the maximum number of images is obtained. That is, the timing at which an endoscopic image with a photographing distance of distance db may not be included in the point in time before the point in time when the freeze operation unit 12f is single-pressed.
- the endoscope system 10 as shown in FIG. 15, for example, if the user thinks that excellent endoscopic images cannot be obtained during the period in which the maximum number of images is obtained by a single press, the user presses the freeze operation unit 12f. should be continued.
- the period until the freeze operation unit 12f is pressed and released is longer than the long press determination period, it is determined to be a long press, and after the first selection condition is changed to the second selection condition, the temporarily saved image is saved. be.
- the endoscope system 10 by displaying the optimum still image on the display 18, it is possible to confirm whether or not a suitable still image has been obtained by single-pressing the freeze operation section 12f. Display of the optimum still image will be described later.
- a long press determination is made at time tn+4, and after the long press determination, the endoscopic image is temporarily stored in the temporary storage area 73 according to the second selection condition.
- the maximum number of temporarily stored images is five and the temporarily stored images are temporarily stored in the temporary storage area 73 .
- Only the endoscopic image Ptn which is the temporarily stored image acquired at time tn with the highest contrast evaluation value according to the first selection condition before the long-press determination, is temporarily stored in the temporary storage area 73, and from time tn+5 to time tn.
- Four endoscopic images up to tn+8 are temporarily stored as temporarily stored images.
- the five temporarily stored images temporarily stored in the temporary storage area 73 were subjected to contrast evaluation based on the contrast evaluation value, and the contrast evaluation value was the highest.
- the endoscopic image Ptn+6 is saved as the optimum still image.
- the endoscopic image Ptn acquired at time tn, which was an appropriate still image, and the endoscopic image Ptn+6 acquired at time t6 are shown with different shading. In this way, the endoscopic image Ptn is updated, and the endoscopic image Ptn+6 with better focusing can be saved as the optimum still image.
- the user continues to press the freeze operation unit 12f until, for example, the timing at which the shooting distance is optimal is included.
- the freeze operation unit 12f By canceling , it is possible to acquire a still image with the most appropriate shooting distance even when the subject moves.
- the maximum number of temporarily stored images temporarily stored in the temporary storage area 73 is five, but the maximum number of images may be set arbitrarily according to the purpose of shooting or the shooting environment. can. For example, if the number of frames is 60 per second, the maximum number of frames can be 15. A maximum of 15 frames corresponds to a shooting period of 0.25 seconds when the number of frames is 60 frames/second.
- the maximum number of images temporarily stored in the temporary storage area 73 does not have to be consecutive frames of endoscopic images.
- the imaging period corresponding to the maximum number of images may be set arbitrarily, and endoscopic images of discontinuous frames may be temporarily stored as temporarily stored images. For example, if the number of frames is 60 frames per second, acquiring the maximum number of 15 images from consecutive frames will result in a shooting period of 0.25 seconds. , the imaging period is 0.5 seconds.
- the shooting period corresponding to the maximum number of images can be called a blurring reduction period.
- the blurring reduction period is a period during which at least one appropriate still image that is optimal for the image evaluation value can be obtained even if the image evaluation value fluctuates during this period. Therefore, depending on the type of subject or the shooting environment, for example, if the subject moves quickly, the blurring reduction period is set short, and if the subject moves slowly, the blurring reduction period is set long. can be adjusted to
- the maximum number of images temporarily stored in the temporary storage area 73 or the shooting period may be adjusted by the first operation and the second operation of the instruction unit. Specifically, when the long-pressing period of the freeze operation unit 12f is equal to or less than the predetermined determination period, the shooting period corresponding to the maximum number of frames is set to 0.25 seconds when the number of frames is 60 frames/second, If the long press period is longer than the determination period, the maximum number of 15 images can be acquired every other frame, and the shooting period can be 0.5 seconds.
- the determination period for determining the shooting period based on the long-pressing period may be set to three or more stages instead of the two stages as described above.
- the temporary storage unit 61 stores the temporarily stored image not for each frame of the endoscopic image, but for one image. Select and save temporarily. Also, this selection condition may be included in the second selection condition. In the case of FIG. 16, the maximum number is 15 sheets. Therefore, when the number of temporarily stored images reaches 15 including the endoscopic image Ptn+3 taken at time tn+3, the optimum still image is selected from the 15 temporarily stored images based on the contrast evaluation value, Saved.
- the period for acquiring the maximum number of images is set long, and the optimum still image update timing can also be lengthened. In this way, it is possible to adjust the period for obtaining the maximum number of sheets by the instruction section.
- the image evaluation unit 62 sets a threshold value for the image evaluation value, and when the image evaluation value equal to or higher than the threshold value is assigned to the temporarily stored image, the optimum still image storage unit 63 considers that there is a still image storage instruction, A temporarily saved image to which an image evaluation value equal to or higher than a threshold value is assigned may be saved as an optimum still image. That is, a threshold is set for the image evaluation value in advance, and when a temporarily stored image having an image evaluation value equal to or higher than the threshold is obtained regardless of whether or not there is an instruction to save the still image, this temporarily stored image is stored as the optimum still image. may As a result, when the optimal still image is displayed on the display, the user can release the long press after recognizing from the display 18 or the like that the optimal still image has been saved while continuing the long press. can do.
- the contrast evaluation value threshold is set to 95.
- the contrast evaluation value can be a relative value with 100 as the contrast evaluation value of an in-focus image with little blurring.
- the temporary storage unit 61 stores the temporarily stored image Ptn+6 as the optimum still image. It should be noted that when temporarily stored images equal to or greater than the threshold are acquired after time Ptn+6, the new temporarily stored image may be stored as the optimum still image, or may not be stored. The user is notified by the notification unit that the optimum still image has been acquired.
- the user can know that the optimum still image has been acquired by notifying that the optimum still image is displayed on the display 18 or that an alert or the like is displayed on the display 18. can.
- the user can confirm on the display 18 or the like whether or not the target still image has been acquired, and can end the long press when it has been acquired.
- the notification unit will be described later.
- the display 18 may display the stored optimal still image and/or appropriate still image. If the display 18 is displaying the optimum still image and/or the appropriate still image, it can be updated to display the latest optimum still image and/or the appropriate still image, respectively. Also, the display 18 may comprise a main screen and a sub-screen. Then, the optimum still image may be displayed on the main screen for a certain period of time, and then displayed on the sub-screen after the certain period of time. Also, the optimum still image may be displayed on the main screen, and the appropriate still image may be displayed on the sub-screen, each being updated to the latest one.
- the endoscopic image Ptn-5 which is the most recent optimum still image saved up to that time, is displayed on the main screen, and a new optimum still image Ptn+6 is obtained
- the endoscopic image Ptn-5 which was the optimum still image, may be updated to display the optimum still image Ptn+6 on the main screen.
- the optimum still image Ptn+6, which is the optimum still image after updating is displayed on the main screen
- the endoscopic image Ptn-5 which was the optimum still image, is displayed on the sub screen.
- the endoscopic image Ptn-5 when the endoscopic image Ptn-5 is displayed on the main screen, the endoscopic image Ptn-7, which is the optimum still image before the endoscopic image Ptn-5 is obtained, is displayed on the sub screen. it's shown. After that, when an endoscopic image, which is an optimum still image with a contrast evaluation value superior to that of the endoscopic image Ptn+6, is obtained, the endoscopic image Ptn-5 on the sub screen is updated, and the endoscopic image is displayed on the sub screen. Display the image Ptn+6.
- the period during which the optimum still image is displayed on the main screen may be set as a display period set in advance, and after this period, the optimum still image may be displayed on the sub-screen. During the period in which the optimum still image is not displayed on the main screen, it is preferable to display the endoscopic image obtained in real time as a moving image.
- the main screen may be displayed on the display 18 and only the optimum still image may be updated and displayed, or two or more sub-screens may be arranged to display a plurality of past appropriate images.
- a plurality of images selected from the latest suitable images in the past may be arranged in chronological order and displayed.
- the endoscope system 10 may also include a notification unit that notifies the user of the update when the display 18 updates and displays the optimum still image and/or the appropriate still image.
- the notification unit may be displayed on the display 18 of the endoscope system 10, or may be other means such as sound that allows the user to recognize the notification.
- the color, thickness, or display form of the display frame of each still image on the display 18 for a certain period after the optimum still image and/or the appropriate still image are updated. is preferably changed so that the user can recognize the display or update at a glance.
- the display 18 includes a moving image display screen 81, a still image display main screen 82, and a still image display sub-screen 83.
- the moving image display screen 81 displays endoscope images in real time.
- the optimum still image is displayed on the still image display main screen 82 .
- the optimum still image is displayed surrounded by a still image display notification frame 84, which is a thick colored line.
- the still image display notification frame 84 may blink.
- the still image display sub-screen 83 displays a plurality of past optimal still images in chronological order.
- the update is notified to the user, so that the user can pay attention to the display 18, and the updated appropriate still image is displayed as desired by the user.
- the appropriate still image updated and displayed on the display 18 can be saved as the optimal still image in good timing by releasing the freeze operation section 12f at that time.
- the notification unit may notify the user of the switching. Also in this case, as described above, for example, the notification can be made by displaying the still image display notification frame 84 in the appropriate still image on the display 18 .
- the notification unit preferably does not notify the user when the notification to the user is performed again within the preset minimum notification period. By setting the minimum notification period, it is possible to avoid complication due to frequent notification.
- the present invention is applied to an endoscopic system that processes endoscopic images.
- the present invention can be applied when saving a still image.
- an autofluorescence image obtained by capturing an autofluorescence image emitted from a subject by irradiation of excitation light is used as an endoscopic image
- the present invention can be used when saving a still image. can be applied.
- various components such as the central control unit 59, the image acquisition unit 51, the noise reduction unit 53, the signal processing unit 55, the image storage unit 56, the display control unit 57, and the video signal generation unit 58 included in the processor device 16
- the hardware structure of a processing unit that executes processing is various processors as shown below.
- the circuit configuration is changed after manufacturing, such as CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), which is a general-purpose processor that executes software (program) and functions as various processing units.
- Programmable Logic Devices which are processors, dedicated electric circuits, which are processors with circuit configurations specially designed to perform various processes, and the like.
- One processing unit may be composed of one of these various processors, or composed of a combination of two or more processors of the same type or different types (for example, a plurality of FPGAs or a combination of a CPU and an FPGA).
- a plurality of processing units may be configured by one processor.
- a plurality of processing units may be configured by one processor.
- this processor functions as a plurality of processing units.
- SoC System On Chip
- SoC System On Chip
- the various processing units are configured using one or more of the above various processors as a hardware structure.
- the hardware structure of these various processors is, more specifically, an electric circuit in the form of a combination of circuit elements such as semiconductor elements.
- endoscope system 12 endoscope 12a insertion portion 12b operation portion 12c bending portion 12d tip portion 12e angle knob 12f freeze operation portion 12g zoom operation portion 14 light source device 16 processor device 18 display 19 keyboard 20 light source portion 20a V-LED 20b B-LED 20c G-LED 20d R-LED 21 Light source processor 30a Illumination optical system 30b Imaging optical system 41 Light guide 42 Illumination lens 43 Objective lens 44 Zoom lens 45 Image sensor 46 CDS/AGC circuit 47 A/D converter 51 Image acquisition unit 52 DSP 53 noise reduction unit 54 memory 55 signal processing unit 56 image storage unit 57 display control unit 58 video signal generation unit 59 central control unit 61 temporary storage unit 62 image evaluation unit 63 optimum still image storage unit 71 selection condition switching instruction reception unit 72 selection Condition switching unit 73 Temporary storage area 74 Contrast evaluation unit 75 Brightness evaluation unit 76 Confidence evaluation unit 77 Malignancy evaluation unit 78 Still image storage instruction reception unit 79 Optimal still image storage area 81 Moving image display screen 82 Still image display main screen 83 Still
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Abstract
Description
12 内視鏡
12a 挿入部
12b 操作部
12c 湾曲部
12d 先端部
12e アングルノブ
12f フリーズ操作部
12g ズーム操作部
14 光源装置
16 プロセッサ装置
18 ディスプレイ
19 キーボード
20 光源部
20a V-LED
20b B-LED
20c G-LED
20d R-LED
21 光源用プロセッサ
30a 照明光学系
30b 撮像光学系
41 ライトガイド
42 照明レンズ
43 対物レンズ
44 ズームレンズ
45 撮像センサ
46 CDS/AGC回路
47 A/Dコンバータ
51 画像取得部
52 DSP
53 ノイズ低減部
54 メモリ
55 信号処理部
56 画像保存部
57 表示制御部
58 映像信号生成部
59 中央制御部
61 一時保存部
62 画像評価部
63 最適静止画保存部
71 選択条件切替指示受付部
72 選択条件切替部
73 一時保存領域
74 コントラスト評価部
75 明るさ評価部
76 確信度評価部
77 悪性度評価部
78 静止画保存指示受付部
79 最適静止画保存領域
81 動画表示画面
82 静止画表示メイン画面
83 静止画表示サブ画面
84 静止画表示報知枠
91 被写体
db、db+c、dm 距離
t、t1~t6、tn~tn+8 時刻
Pt2、Ptn、Ptn-7~Ptn+7 内視鏡画像
ST100~ST200 ステップ
Claims (20)
- 被写体を撮影する内視鏡とプロセッサとを備え、
前記内視鏡は、指示部を備え、
前記プロセッサは、
前記内視鏡により前記被写体を撮影して得る内視鏡画像をフレーム毎に取得し、
第1選択条件又は第2選択条件に基づいて選択した前記内視鏡画像を、一時保存画像として一時保存領域に一時保存し、
前記一時保存領域が一時保存する前記一時保存画像のそれぞれに対し、画像評価を行うことにより画像評価値を付与し、
選択条件切替指示に基づき、前記第1選択条件と前記第2選択条件とを切り替え、
静止画保存指示に基づき、前記一時保存画像から前記画像評価値により選択した最適静止画を保存し、
前記指示部は、前記選択条件切替指示と前記静止画保存指示とを行う内視鏡システム。 - 前記プロセッサは、前記内視鏡画像を取得し始めた際に、前記第1選択条件に基づいて選択した前記内視鏡画像の一時保存を行う請求項1に記載の内視鏡システム。
- 前記指示部は、第1動作と第2動作とを行い、前記第2動作により前記静止画保存指示を行う請求項1又は2に記載の内視鏡システム。
- 前記指示部は、モーメンタリ型スイッチを含み、
前記第1動作は前記モーメンタリ型スイッチの押下であり、前記第2動作は押下した前記モーメンタリ型スイッチの解除である請求項3に記載の内視鏡システム。 - 前記指示部は、オルタネート型スイッチを含み、
前記第1動作は前記オルタネート型スイッチの一度目の押下と解除とであり、前記第2動作は前記オルタネート型スイッチの二度目の押下と解除とである請求項3に記載の内視鏡システム。 - 前記プロセッサは、前記第1動作から前記第2動作までの期間を計測し、
前記指示部は、前記期間が予め設定した判定期間以上の場合、前記第1動作から前記判定期間が経過した際に、前記選択条件切替指示を行う請求項3ないし5のいずれか1項に記載の内視鏡システム。 - 前記指示部は、前記静止画保存指示を行った際に、前記プロセッサが前記第2選択条件に基づいて前記内視鏡画像を一時保存していた場合、前記選択条件切替指示を行う請求項1ないし6のいずれか1項に記載の内視鏡システム。
- 前記プロセッサは、選択した前記内視鏡画像を、前記一時保存画像として予め設定した最大枚数以下で前記一時保存領域に一時保存し、
前記第1選択条件は、前記一時保存画像が、前記最大枚数未満で前記一時保存領域に一時保存されている場合は、第1A選択条件として、撮影時刻が最も新しい順に前記最大枚数となるまで前記内視鏡画像を前記一時保存画像として前記一時保存領域に一時保存し、前記最大枚数の前記一時保存画像が前記一時保存領域に一時保存されている場合は、第1B選択条件として、前記一時保存領域が一時保存する前記一時保存画像のうち撮影時刻が最も古い前記一時保存画像を前記一時保存領域から削除した上で、撮影時刻が最も新しい順に前記内視鏡画像を前記一時保存画像として前記一時保存領域に一時保存することを含む請求項1ないし7のいずれか1項に記載の内視鏡システム。 - 前記プロセッサは、選択した前記内視鏡画像を、前記一時保存画像として予め設定した最大枚数以下で前記一時保存領域に一時保存し、
前記第2選択条件は、前記一時保存画像が、前記最大枚数未満で前記一時保存領域に一時保存されている場合は、第2A選択条件として、撮影時刻が最も新しい順に前記最大枚数となるまで前記内視鏡画像を前記一時保存画像として前記一時保存領域に一時保存し、前記最大枚数の前記一時保存画像が前記一時保存領域に一時保存されている場合は、第2B選択条件として、前記一時保存画像から前記画像評価値により選択した適正静止画のみを前記一時保存画像として前記一時保存領域に残し、かつ、前記一時保存領域から前記適正画像以外を削除した上で、前記第2A選択条件を行うことを含む請求項1ないし8のいずれか1項に記載の内視鏡システム。 - 前記プロセッサは、選択した前記内視鏡画像を、前記一時保存画像として予め設定した最大枚数以下で前記一時保存領域に一時保存し、
前記第2選択条件は、前記一時保存画像が、前記最大枚数未満で前記一時保存領域に一時保存されている場合は、第2A選択条件として、撮影時刻が最も新しい順に前記最大枚数となるまで前記内視鏡画像を前記一時保存画像として前記一時保存領域に一時保存し、前記最大枚数の前記一時保存画像が前記一時保存領域に一時保存されている場合は、第2C選択条件として、前記一時保存画像から前記画像評価値により選択した適正静止画のみを前記一時保存画像として前記一時保存領域に残し、かつ、前記一時保存領域から前記適正画像以外を削除した上で、撮影時刻が最も新しい前記内視鏡画像を選択して、前記一時保存画像として前記一時保存領域に一時保存した後、前記一時保存領域に一時保存した前記一時保存画像から前記画像評価値により選択した適正静止画のみを前記一時保存画像として前記一時保存領域に一時保存することを含む請求項1ないし8のいずれか1項に記載の内視鏡システム。 - 前記最適静止画及び/又は前記適正静止画を表示するディスプレイを備え、
前記ディスプレイは、前記最適静止画及び/又は前記適正静止画を表示していた場合は、それぞれ更新して最新の前記最適静止画及び/又は前記適正静止画を表示する請求項9又は10に記載の内視鏡システム。 - 前記ディスプレイは、メイン画面とサブ画面とを備え、
前記最適静止画は、予め設定した表示期間で前記メイン画面に表示し、前記表示期間後は前記サブ画面に表示する請求項11に記載の内視鏡システム。 - 前記ディスプレイが前記最適静止画及び/又は前記適正静止画を更新して表示した場合、前記更新に関してユーザに報知する報知部を備える請求項11又は12に記載の内視鏡システム。
- 前記報知部は、前記プロセッサが、前記第1選択条件と前記第2選択条件とを切り替えた場合、前記切替に関してユーザに報知する請求項13に記載の内視鏡システム。
- 前記報知部は、ユーザへの前記報知が予め設定した最低報知期間以内に再度行われる場合は、前記報知を行わない請求項13又は14に記載の内視鏡システム。
- 前記プロセッサは、前記一時保存画像が有するコントラスト及び/又は明るさについて前記画像評価を行い、前記画像評価値は、前記一時保存画像の前記コントラスト及び/又は前記明るさに関する値である請求項1ないし15のいずれか1項に記載の内視鏡システム。
- 前記プロセッサは、前記一時保存画像に写る前記被写体が有する特定の病変に関する確信度及び/又は悪性度について前記画像評価を行い、前記画像評価値は前記確信度及び/又は前記悪性度である請求項1ないし15のいずれか1項に記載の内視鏡システム。
- 前記プロセッサは、前記画像評価値に閾値を設け、前記閾値以上の前記画像評価値を前記一時保存画像に付与した場合、前記静止画保存指示があったものとみなし、前記閾値以上の前記画像評価値を付与した前記一時保存画像を前記最適静止画として保存する請求項
1ないし17のいずれか1項に記載の内視鏡システム。 - 前記指示部は、フリーズ操作部を含む請求項1ないし18のいずれか1項に記載の内視鏡システム。
- 指示部を備え被写体を撮影する内視鏡とプロセッサとを備える内視鏡システムの作動方法であって、
前記プロセッサは、
前記内視鏡により前記被写体を撮影して得る内視鏡画像をフレーム毎に取得し、
第1選択条件又は第2選択条件に基づいて選択した前記内視鏡画像を、一時保存画像として一時保存領域に一時保存し、
前記一時保存領域が一時保存する前記一時保存画像のそれぞれに対し、画像評価を行うことにより画像評価値を付与し、
選択条件切替指示に基づき、前記第1選択条件と前記第2選択条件とを切り替え、
静止画保存指示に基づき、前記一時保存画像から前記画像評価値により選択した最適静止画を保存し、
前記指示部は、前記選択条件切替指示と前記静止画保存指示とを行う内視鏡システムの作動方法。
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JPH10323326A (ja) * | 1997-05-23 | 1998-12-08 | Olympus Optical Co Ltd | 内視鏡装置 |
JP2011218090A (ja) * | 2010-04-14 | 2011-11-04 | Olympus Corp | 画像処理装置、内視鏡システム及びプログラム |
JP2013230319A (ja) * | 2012-05-02 | 2013-11-14 | Olympus Corp | 内視鏡装置及び内視鏡装置の制御方法 |
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JPH10323326A (ja) * | 1997-05-23 | 1998-12-08 | Olympus Optical Co Ltd | 内視鏡装置 |
JP2011218090A (ja) * | 2010-04-14 | 2011-11-04 | Olympus Corp | 画像処理装置、内視鏡システム及びプログラム |
JP2013230319A (ja) * | 2012-05-02 | 2013-11-14 | Olympus Corp | 内視鏡装置及び内視鏡装置の制御方法 |
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