WO2016039270A1 - 内視鏡システム、内視鏡システムの作動方法 - Google Patents
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Definitions
- the present invention relates to an endoscope system that acquires a first image and a second image of different regions in the same subject, and an operation method of the endoscope system.
- a wide-angle endoscope for example, a direct-view object image through a direct-view observation window and a side-view object image through a side-view observation window as described in Japanese Patent No. 4782900 A camera that combines an optical system and an image sensor as described in Japanese Patent Publication No. 2013-542467 (WO2012 / 056453) There are types provided for each side view.
- a wide-angle endoscope having such a direct-view observation optical system and a side-view observation optical system includes, for example, an illumination unit that emits light forward and an illumination unit that emits light laterally, and further, Some of the amount of light emitted to the front and the amount of light emitted to the side can be individually adjusted.
- the proximity portion when the subject is irradiated with illumination light, the proximity portion has high illuminance, the remote portion has low illuminance, and the proximity portion is observed brighter and the remote portion is observed darker.
- the central part of the observation site by direct viewing becomes a remote part in the axial direction of the lumen and becomes dark, and observation by side-viewing
- the part may become a close part of the inner wall of the lumen and become bright.
- the distance of the subject changes from side to side, so that the left side field of view is bright and the right side field of view is not only dark, but also the front field of view The left side is bright and the right side is dark.
- the endoscope is capable of adjusting the amount of illumination light for each viewing direction as described above when the brightness of the image is unbalanced in this way, for example, by increasing the amount of light irradiated to the right side, Light amount control is performed to avoid brightness imbalance.
- the brightness of a direct-view visual field image and the brightness of a side-view visual field image are individually detected, and one of the visual field images reaches a brightness target value suitable for observation based on the detection result.
- an endoscope system for controlling a light source device is described.
- Japanese Patent Application Laid-Open No. 2003-179785 discloses that each image is captured so that the brightness of the wide-angle image and the magnified image are displayed in the same manner in an image photographing apparatus that captures a wide-angle image and a magnified image. A technique for setting the amplification factor of each signal is described.
- the present invention has been made in view of the above circumstances, and provides an endoscope system with high visibility in which a luminance difference between adjacent portions of a plurality of images having different fields of view is suppressed, and an operation method of the endoscope system. It is an object.
- An endoscope system includes an image configuration unit that configures a first image and a second image based on imaging signals corresponding to different regions in the same subject, the first image, The luminance detection unit for detecting the luminance in the second image, and the difference in luminance in the adjacent portion between the first image and the second image arranged adjacent to each other are equal to or less than a threshold value.
- a luminance control unit that adjusts the luminance of at least one of the first image and the second image.
- An operation method of an endoscope system includes a lighting unit that irradiates light to a first region in a subject and a second region in the subject different from the first region.
- An endoscope system operating method comprising: a first subject image acquisition unit provided in an insertion unit acquires a first imaging signal relating to a first subject image in the first region; A step, a second subject image acquisition unit provided in the insertion unit acquires a second imaging signal related to a second subject image in the second region, and an image configuration unit, A step of forming a first image based on the first image pickup signal and forming a second image based on the second image pickup signal; and a luminance detecting unit configured to detect the luminance of the first image and the first image
- the steps of detecting the brightness of the image 2 and the brightness control unit are arranged adjacent to each other. Adjusting the luminance of at least one of the first image and the second image so that a luminance difference in the adjacent portion between the first image and the second image is equal to or
- the figure which shows a mode that the luminance difference of the adjacent part of images is suppressed by gain reduction.
- luminance difference of the part further adjacent to the adjacent part of images is suppressed by gain reduction.
- the figure which shows a mode that the luminance difference of the adjacent part of images is suppressed by gain increase.
- 7 is a flowchart showing luminance adjustment processing of the endoscope system in the first embodiment.
- FIG. 7 is a flowchart showing details of gain-up processing in step S7 of FIG. 6 in the first embodiment.
- 7 is a flowchart showing details of gain reduction processing in step S8 of FIG. 6 in the first embodiment.
- Embodiment 3 of this invention the perspective view which shows partially the structure of the endoscope in the state with which the side image acquisition unit is mounted
- the perspective view which shows partially the structure of the endoscope in the state from which the side image acquisition unit is removed.
- FIG. 1 is a diagram showing a configuration of an endoscope system.
- the endoscope system includes an endoscope 1, a video processor 2, and a monitor 3.
- the endoscope 1 is configured as an electronic endoscope having an insertion portion 1a inserted into the subject.
- the endoscope 1 is provided in the insertion portion 1a and acquires a first object image for acquiring a first imaging signal related to a first object image (optical image) of a first region in the object.
- a second object for obtaining a second imaging signal relating to a second object image (optical image) of a second region in the object different from the first region, provided in the insertion unit 1a.
- an example of the first region is a region including the front in the subject (a region of the front visual field), and the first subject image acquisition unit is arranged with the front facing the distal end of the insertion unit 1a.
- An imaging unit configured to generate a first imaging signal by photoelectrically converting a first subject image (optical image) of a first region in the subject including the front along the longitudinal direction of the insertion unit 1a. 11 (first imaging unit).
- an example of the second region different from the first region is a region including a side in the same subject (a region of a side field of view), and the second subject image acquisition unit includes the insertion unit 1a.
- a second imaging signal is generated by photoelectrically converting a second object image (optical image) in a second region in the object including the side intersecting the longitudinal direction. More specifically, a plurality of second object image acquisition units are arranged at a plurality of angular positions in the circumferential direction of the insertion unit 1a, and a plurality of second imaging signals related to the plurality of second object images. To get.
- the second subject image acquisition unit includes an imaging unit 12 (second imaging unit separate from the first imaging unit) that captures an area of the right visual field and an area of the left visual field.
- An imaging unit 13 (second imaging unit separate from the first imaging unit) is included.
- the right side field of view and the left side field of view are, for example, two equally divided positions in the circumferential direction with the front field of view as the center.
- These imaging units 11 to 13 are configured to include an imaging optical system and an imaging element, and generate an imaging signal by photoelectrically converting an object image formed by the imaging optical system by the imaging element.
- An imaging signal is output to the video processor 2 electrically connected to the imaging units 11 to 13.
- the illumination unit a first illumination unit that irradiates light to the first region and a second illumination unit that irradiates light to the second region are provided.
- the first illumination unit corresponds to the illumination unit 15 that emits light to the imaging range of the imaging unit 11.
- the second illumination unit corresponds to the illumination unit 16 that emits light to the imaging range by the imaging unit 12 and the illumination unit 17 that emits light to the imaging range by the imaging unit 13. Accordingly, the illumination unit 15 illuminates the front, the illumination unit 16 illuminates the right side, and the illumination unit 17 illuminates the left side.
- These illumination units 15, 16, and 17 are configured to include light emitting elements such as LEDs, for example, and emit light by adjusting each light amount based on a control signal from an illumination control unit 21 (to be described later) of the video processor 2. It is like that.
- the right side and the left side are illustrated as the sides on which the illumination unit illuminates and the imaging unit images, but instead of or in addition to these, the upper side, the lower side, or diagonally Sides or the like may be included, or any combination thereof may be used.
- the video processor 2 includes an image construction unit 20, an illumination control unit 21, a luminance detection unit 22, a luminance control unit 23, a threshold storage unit 24, and an image output unit 25.
- the image construction unit 20 composes a first image and a second image based on imaging signals corresponding to different regions in the same subject, and is electrically connected via a signal line 14.
- the first image pickup signal is received from the first image pickup unit to form a first image (image signal)
- the second image pickup signal is received from the second image pickup unit to receive the second image (image signal).
- the image configuration unit 20 arranges the configured first image and second image so as to be adjacent to each other.
- the image constructing unit 20 is based on the first image and the second image, and the first image is the center and the plurality of second images are the first corresponding to the visual field directions of the imaging units 11 to 13.
- the images are arranged at a plurality of angular positions in the circumferential direction of the image (in the example of FIG. 1, two equally divided positions in the circumferential direction).
- the image construction unit 20 is configured to include, for example, a frame buffer, and the imaging signals sequentially input from the imaging units 11 to 13 in units of pixels, for example, are set to addresses corresponding to the pixel positions in the frame buffer.
- the imaging signals sequentially input from the imaging units 11 to 13 in units of pixels for example, are set to addresses corresponding to the pixel positions in the frame buffer.
- the illumination control unit 21 adjusts each light emission amount of the illumination units 15 to 17 to emit light. That is, the illumination control unit 21 controls the light amount of the first illumination unit and the light amount of the second illumination unit independently.
- the luminance detection unit 22 detects the luminance of the first image and the luminance of the second image, respectively. Specifically, the luminance detection unit 22 detects the luminance of each pixel constituting the first image and the second image, and further detects the luminance of a plurality of regions Re obtained by dividing the image as will be described later. .
- the luminance control unit 23 is configured so that the luminance difference in the adjacent portion between the first image and the second image arranged adjacent to each other is equal to or less than a predetermined threshold (luminance difference threshold). The brightness of at least one of the second image is adjusted.
- the threshold storage unit 24 stores the above-described threshold in a nonvolatile manner.
- the threshold storage unit 24 further stores a lower limit luminance Ad (see FIG. 5) and an upper limit luminance Au (see FIG. 3) described later.
- the image output unit 25 outputs a display signal in which the first image and the second image are arranged adjacent to each other based on the image whose luminance is adjusted by the luminance control unit 23.
- the monitor 3 serving as a display unit displays an image.
- the screen of the monitor 3 has a front image 31 (based on the first image) based on the imaging signal obtained from the imaging unit 11 in the center and a right side based on the imaging signal obtained from the imaging unit 12.
- the image 32 is next to the right of the front image 31, and the left side image 33 based on the imaging signal obtained from the imaging unit 13 is next to the left of the front image 31 (the right side image 32 and the left side image 33 are the second images, respectively. (Based on the image), each arranged and displayed.
- the image construction unit 20 composes an image so that the first image and the second image are arranged adjacent to each other in the same screen.
- the arrangement of the images 31 to 33 viewed from the observer is the same as the direction of each visual field viewed from the endoscope 1, as if the observation is performed by one super wide-angle camera.
- the image structure is realized.
- the front image 31, the right side image 32, and the left side image 33 are displayed on one monitor 3, but each may be displayed on a separate monitor. That is, the image output unit 25 is either a single display signal for displaying the first image and the second image on one monitor 3 or a plurality of display signals for displaying on the plurality of monitors 3. As a result, a display signal is output.
- the endoscope system according to the present embodiment does not perform the processing shown in the flowcharts in FIGS. 6 to 8 separately from the processing that is executed separately on the endoscope image acquired in advance, It is characterized in that the endoscope image acquired by the mirror 1 is performed as a process for adjusting the brightness in real time by the video processor 2.
- FIG. 6 is a flowchart showing the brightness adjustment processing of the endoscope system.
- the brightness control unit 23 does not adjust the brightness for non-image pixels that do not constitute either the first image or the second image (for example, non-image pixels in a boundary region between images). It will be.
- the luminance detection unit 22 divides the first image and the second image into a plurality of regions Re (see FIG. 1), and sets the average luminance of each divided region Re for each region Re. (Step S2).
- the average luminance is an average of the luminance of the pixels in the region Re.
- FIG. 2 is a diagram showing an example of the luminance distribution of a plurality of images having different fields of view.
- the region Re is composed of one or more pixels (thus, the region Re can be composed of one pixel).
- the luminance detection unit 22 is an area configured by a plurality of pixels, for example, an image (a front image 31, a right side image 32, and a left side image 33) in the horizontal direction. Are set as vertically elongated rectangular regions (see FIGS. 1 and 2, etc.).
- the method of dividing an image into a plurality of regions Re is not limited to this.
- the image may be divided into a plurality of grid-like regions divided in the horizontal direction and the vertical direction.
- it may be divided into concentric regions (for example, concentric circles or concentric polygons) divided into a plurality of portions in the radial direction, or other division methods may be employed.
- the luminance distribution shown in FIG. 2 shows that in the lumen-shaped subject, for example, the endoscope approaches the left side wall and the distance to the right side wall increases, and the right side image 32 becomes dark. A state when the right side image 32 is brightened by increasing the amount of light is shown. That is, as shown in FIG. 2, a large luminance difference between two regions Re adjacent to each other with a boundary is caused by, for example, the light control of the illumination units 15 to 17 by the illumination control unit 21. Therefore, the luminance control unit 23 adjusts the luminance with respect to the first image and the second image acquired after performing the light amount control by the illumination control unit 21.
- the adjacent portion across the boundary between the front image 31 and the right side image 32 more specifically, the average luminance An-1 of the (n-1) th region Re on the front image 31 side and the right side
- the numbers 1, 2,..., (N ⁇ 1), n,... Indicating the horizontal position of the region Re are serial numbers from the left side image 33 through the front image 31 to the right side image 32. .
- the luminance control unit 23 calculates a luminance difference
- the luminance control unit 23 further reduces the average luminance An-1, which is lower than the average luminance An in the example shown in FIG. Then, it is determined whether or not the average luminance An-1 is smaller than a predetermined lower limit luminance Ad (see FIG. 5) (step S5).
- the lower limit luminance Ad is a luminance indicating the lower limit of the luminance range appropriate for observing an image and making a diagnosis.
- the higher average luminance that is, in the example shown in FIG. 2, is the average luminance An greater than the predetermined upper limit luminance Au (see FIG. 3)? It is determined whether or not (step S6).
- the upper limit luminance Au is a luminance indicating the upper limit of the appropriate luminance range for observing an image and making a diagnosis.
- step S6 If it is determined in step S6 that the luminance is less than or equal to the upper limit luminance Au, or if it is determined in step S5 that the luminance is smaller than the lower limit luminance Ad, a gain-up process as described later with reference to FIG. 7 is performed. Perform (step S7).
- the gain-up process is performed when it is determined that the lower average luminance is equal to or higher than the lower limit luminance Ad and the higher average luminance is equal to or lower than the upper limit luminance Au.
- the gain reduction process may be performed.
- step S6 determines whether it is larger than the upper limit luminance Au. If it is determined in step S6 that it is larger than the upper limit luminance Au, a gain-down process as will be described later with reference to FIG. 8 is performed (step S8).
- step S4 If it is determined in step S4 that the threshold value is equal to or less than the threshold value, or if the process of step S7 or step S8 is performed, it is further determined whether there is another boundary between images (step S9). .
- step S2 the process proceeds to step S2 and the above-described processing is performed on the region Re sandwiching the other boundary.
- the process proceeds to step S2 and the above-described processing is performed on the region Re sandwiching the other boundary.
- the process proceeds to step S2 and the above-described processing is performed on the region Re sandwiching the other boundary.
- the boundary between the front image 31 and the right side image 32 not only the boundary between the front image 31 and the right side image 32 but also the boundary between the front image 31 and the left side image 33 exists. Become.
- step S9 determines whether other boundary exists. If it is determined in step S9 that no other boundary exists, the process returns from this process to a main process (not shown).
- FIG. 7 is a flowchart showing details of the gain-up process in step S7 of FIG.
- the gain of the region Re having a lower average luminance is increased so that the luminance difference is equal to or smaller than the threshold (step S11).
- the luminance control unit 23 divides the first image and the second image into a plurality of regions Re when the luminance adjustment is performed by gain-up or gain-down described later.
- the unit is Re.
- FIG. 5 is a diagram illustrating a state in which the luminance difference between adjacent portions of images is suppressed by increasing the gain.
- the lower average luminance An of the average luminance An-1 and the average luminance An is smaller than the lower limit luminance Ad.
- the gain increase process in step S7 is performed. It is an example that is determined to be performed.
- the luminance control unit 23 increases the gain to the average luminance A′n by applying a gain larger than 1 to the lower average luminance An.
- the gain at this time may be given a prescribed value according to the product, or may be settable by the user.
- between the average luminance A′n of the gained region Re and the average luminance An ⁇ 1 of the adjacent region Re on the opposite side across the boundary is equal to or less than the threshold value. If not, a gain greater than 1 is further applied to the average luminance A′n. By repeating such processing as necessary, the luminance difference
- the gain-up method is used in which the gain higher than 1 is applied to the lower average luminance a plurality of times until the luminance difference becomes equal to or smaller than the threshold.
- the present invention is not limited to this method. The gain-up method may be used as appropriate.
- the average luminance A′n of the region Re in which the luminance adjustment is performed can be achieved only by setting the luminance difference
- between the average brightness An + 1 of the area Re adjacent to the side opposite to the boundary of the area Re may be larger than the threshold value.
- step S13 it is determined whether or not the calculated luminance difference
- step S11 the process proceeds to step S11 to perform the process as described above.
- step S13 when it is determined in step S13 that the luminance difference calculated after sequentially adjusting the luminance of the region Re in order from the region Re adjacent to the boundary is equal to or smaller than the threshold value, this processing is shown in FIG. Return to processing.
- FIG. 8 is a flowchart showing details of the gain reduction process in step S8 of FIG.
- the gain of the region Re having the higher average luminance is reduced so that the luminance difference is equal to or less than the threshold (step S21).
- FIG. 3 is a diagram illustrating a state in which the luminance difference between adjacent portions of images is suppressed by gain reduction.
- the higher average luminance An of the average luminance An-1 and the average luminance An is larger than the upper limit luminance Au.
- the gain reduction process in step S8 is performed. It is an example that is determined to be performed.
- the luminance control unit 23 reduces the gain to the average luminance A′n by applying a gain smaller than 1 to the higher average luminance An.
- the gain at this time may be given a prescribed value according to the product, or may be set by the user.
- between the average luminance A′n of the gain-reduced region Re and the average luminance An ⁇ 1 of the opposite region Re adjacent across the boundary is equal to or less than the threshold value. If not, a gain smaller than 1 is further applied to the average luminance A′n. By repeating such processing as necessary, the luminance difference
- the present invention is not limited to this method, and is arbitrary. The gain down method may be used as appropriate.
- step S22 the brightness difference
- step S21 if it is determined that the value is larger than the threshold value, the process goes to step S21 to perform the process as described above.
- FIGS. 3 and 4 the luminance difference between the average luminance A′n after the luminance adjustment and the average luminance An + 1 of the region Re adjacent to the opposite side of the boundary is larger than the threshold value.
- the average luminance An + 1 is reduced in gain to the average luminance A′n + 1, and the luminance difference
- FIG. 4 is a diagram illustrating a state in which the luminance difference between the adjacent portions adjacent to each other between the images is suppressed by the gain reduction.
- step S23 when it is determined in step S23 that the luminance difference calculated after sequentially adjusting the luminance of the region Re in order from the region Re adjacent to the boundary is equal to or smaller than the threshold value, this processing is shown in FIG. Return to processing.
- whether or not to perform the luminance adjustment processing by the luminance control unit 23 is determined based on the average luminance of the pixels in the region Re. Instead, the luminance of the pixels in the region Re is weighted. You may determine based on the weighted average brightness which performed. For example, when observing an image, the subject located at the center in the vertical direction of the image is more important than the subject located at the upper and lower ends of the image. Therefore, when weighting and averaging the luminance of the pixels in the region Re, a large weight is given to the central pixel in the vertical direction, and a small weight is given to the pixels at the upper end and the lower end. And good.
- the brightness difference between the pixel pairs facing each other across the boundary is calculated, and it is determined that the brightness adjustment processing by the brightness control unit 23 is performed when the ratio of the pixel pairs whose brightness difference is greater than the threshold is equal to or greater than a predetermined ratio. You may make it.
- one of the gain-up and gain-down processing is performed at one boundary.
- the processing may be slightly complicated, one boundary is processed. It is also possible to perform processing such as increasing the gain of the region Re having a lower average luminance and decreasing the gain of the region Re having a higher average luminance.
- the first image and the second image are set so that the luminance difference in the adjacent portion between the first image and the second image arranged adjacent to each other is equal to or less than a predetermined threshold value. Since the brightness of at least one of the images is adjusted, the brightness difference between adjacent portions of a plurality of images having different fields of view can be suppressed, and the visibility can be increased.
- the luminance is adjusted in units of the region Re obtained by dividing the image, the luminance difference in the region Re is maintained, and the shadow and stereoscopic effect in the region Re can be maintained.
- the luminance difference based on the average luminance is calculated and compared with the threshold value and the luminance is adjusted, it is possible to appropriately grasp the luminance difference between the adjacent regions Re and adjust the luminance.
- the brightness adjustment is performed by either gain up or gain down, it is possible to reduce the brightness difference by a relatively simple process.
- gain reduction when gain reduction is prioritized over gain up, a bright portion close to whiteout can be observed with more appropriate and easy-to-see brightness.
- non-image pixels are not adjusted for luminance, non-image pixels (for example, between images or the periphery outside the image) are maintained at a constant luminance value, and the luminance of the non-image pixels is determined. Since the value does not change for each image, the image is easy to see.
- the luminance difference between images with different fields of view can be satisfactorily reduced when the rectangular images are arranged in the horizontal direction so that wide-angle images can be observed. it can.
- the luminance difference between the images can be reduced well when a plurality of concentric images having different diameters are acquired and a wide-angle image can be observed. it can.
- the brightness adjustment is performed on the first image and the second image acquired after the light amount control by the illumination control unit 21 is performed, an image in which the average brightness for each field of view is optimized. It becomes an object of brightness adjustment, can suppress a decrease in contrast, and can suppress noise amplification.
- the image composing unit 20 configures an image in which the first image and the second image are arranged adjacent to each other, it is possible to observe images of a plurality of fields of view at a wide angle.
- the image output unit 25 When the image output unit 25 outputs a single display signal, the first image and the second image can be displayed on the single monitor 3 and observed. When the image output unit 25 outputs a plurality of display signals, the first image and the second image can be displayed on each of the plurality of monitors 3 and observed.
- an ultra-wide-angle endoscope can be realized without using an expensive and large super-wide-angle lens.
- a plurality of second object image acquisition units arranged at a plurality of angular positions in the circumferential direction of the insertion unit 1a acquire a plurality of second imaging signals, and the image construction unit 20 performs a first operation based on the first imaging signals.
- One image is the center, and a plurality of second images based on a plurality of second imaging signals are at a plurality of angular positions in the circumferential direction of the first image (in the example of FIG. 1, two equally divided positions in the circumferential direction).
- imaging signals in a plurality of viewing directions can be acquired.
- FIG. 9 shows Embodiment 2 of the present invention and is a diagram showing a configuration of an endoscope system.
- the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted as appropriate, and only different points will be mainly described.
- the configuration of the imaging system of the endoscope 1 is changed, and instead of providing a light source such as an LED in the endoscope 1, a light source device 26 is provided in the video processor 2. It has become.
- a front optical system 41 that acquires a front optical image (an image of a field of view of a region including the front in the subject) along the longitudinal direction of the insertion portion 1a at the distal end portion of the insertion portion 1a of the endoscope 1. And an illumination unit 15 that irradiates light to the field of view of the front optical system 41.
- a circumferential surface portion in the vicinity of the proximal end side of the front optical system 41 and the illumination unit 15 has a predetermined circumferential angular range (a predetermined angular range is 360 ° on the side intersecting the longitudinal direction of the insertion portion 1a).
- a lateral optical system 42 that acquires an optical image of the entire circumference in the circumferential direction (an image of a field of view of a region including a side different from the front in the same subject), and the side optical system 42 And an illuminating unit 43 that irradiates the field of view with light.
- the front optical system 41 and the side optical system 42 are a composite optical system that transmits and acquires a front optical image and reflects and acquires an optical image in a predetermined angular range in the side circumferential direction. You may comprise.
- the front optical image by the front optical system 41 and the side (circumferential direction) optical image by the side optical system 42 are, for example, formed in different imaging regions on a single imaging device. It has become.
- the first subject image acquisition unit is configured by the front optical system 41 and an imaging region that captures an optical image in front of the imaging element, and the front of the distal end portion of the insertion unit 1a is provided. It is arranged toward.
- the second subject image acquisition unit is configured by the side optical system 42 and an imaging region that captures an optical image in the lateral direction of the imaging element, and is provided circumferentially on the peripheral surface portion of the insertion unit 1a.
- the subject image in a predetermined angle range is arranged so as to be imaged.
- the first subject image acquisition unit and the second subject image acquisition unit also include one imaging unit (imaging element), and an optical image of the subject in the first field of view (first image).
- imaging element imaging element
- first image optical image of the subject in the first field of view
- second object image optical image of the object in the second field of view
- the second imaging signal is generated by forming an image on the part.
- the first imaging signal and the second imaging signal generated by the imaging device are output to the video processor 2, and the above-described image configuration unit 20, luminance detection unit 22, luminance control unit 23, and image output in the video processor 2.
- Connected to the unit 25 that is, the imaging unit is electrically connected to the luminance control unit 23).
- the video processor 2 is provided with a light source device 26 that emits illumination light, instead of the illumination control unit 21 of the first embodiment.
- the light emitted from the light source device 26 is irradiated to the subject in each visual field direction from the illumination unit 15 and the illumination unit 43 including the illumination optical system via the light guide (LG) 27. It has become.
- the optical image of the front optical system 41 is formed as a circular optical image at the center of the imaging device, and a first imaging signal is generated by photoelectric conversion of the imaging device. Based on the first image pickup signal, the image forming unit 20 forms a circular front image 31A.
- the optical image of the side optical system 42 is an annular optical image having a predetermined angle range in a ring surrounding the circular optical image at the central portion described above in the image sensor (the predetermined angle range is 360 °).
- the optical image is formed as an annular optical image
- a second imaging signal is generated by photoelectric conversion of the imaging device. Based on the second imaging signal, the image construction unit 20 forms, for example, an annular side image 32A of the outer peripheral portion of the front image 31A.
- the image construction unit 20 configures the front image 31A that is the first image in a circular shape, and the side image 32A that is the second image within a predetermined angular range in the ring surrounding the front image 31A. Configure the shape to compose the image.
- a gap 35 is generated between the front image 31A and the side image 32A.
- the gap 35 has a black frame shape because it is a dark part where an optical image of the subject is not formed on the image sensor. Accordingly, the gap 35 is a set of non-image pixels that do not constitute either the first image or the second image, and the luminance control unit 23 does not adjust the luminance for the gap 35.
- the imaging element generally includes a rectangular imaging surface, but the image circles of the front optical system 41 and the side optical system 42 are generally smaller than the imaging surface as shown in FIG. It becomes a circular area. Therefore, a non-image region 36 including a set of non-image pixels that does not constitute either the first image or the second image is generated around the side image 32A.
- the luminance detection unit 22 and the luminance control unit 23 have, for example, a concentric shape in which the front image 31A and the side image 32A are divided into a plurality of portions in the radial direction (here, concentric circles are used, but not limited thereto). In other words, the average luminance is detected and the luminance is adjusted in units of the region Re.
- the first imaging signal related to the first subject image in front of the insertion portion 1a and the circumference of the insertion portion 1a can be obtained while providing substantially the same effect as the first embodiment described above.
- a second imaging signal related to a second subject image in a predetermined angular range of directions, and the image construction unit 20 composes the first image into a circular shape as shown in FIG. Even when the second image is formed into a shape of a predetermined angular range in the ring surrounding the periphery of the first image and an image signal (image) is formed, an image that matches the viewing direction at the time of imaging is obtained. It becomes possible to observe.
- the diameter and weight of the endoscope distal end portion can be effectively reduced. be able to.
- the image The first image area and the second image area are separated from (image signal) and cut out, and brightness adjustment similar to that described in the first embodiment is performed for each, and the processing is performed.
- the process of combining the one image and the second image and returning to the original one may be performed.
- FIG. 10 and 11 show Embodiment 3 of the present invention
- FIG. 10 is a perspective view partially showing the configuration of the endoscope in a state where the side image acquisition unit 50 is attached.
- FIG. 4 is a perspective view partially showing the configuration of the endoscope in a state in which a side image acquisition unit 50 is removed.
- the endoscope of this embodiment includes an endoscope main body 1A and a side image acquisition unit 50, as shown in FIGS.
- the endoscope main body 1A includes an imaging unit 11 that acquires a first imaging signal related to the front image 31, an illumination unit 15 that emits light forward that is an imaging range of the imaging unit 11, and forceps and the like. And a forceps channel 19 for inserting the treatment instrument, and can be used as a general direct-view endoscope.
- the side image acquisition unit 50 is configured to be detachable with respect to the endoscope main body 1A.
- the side image acquisition unit 50 includes an imaging unit 12 that acquires a second imaging signal related to the right side image 32, an illumination unit 16 that emits light to the right side that is an imaging range of the imaging unit 12, and a left side.
- the imaging unit 13 that acquires the second imaging signal related to the image 33, the illumination unit 17 that emits light to the left side that is the imaging range by the imaging unit 13, and the endoscope body 1A are fitted to the side.
- the endoscope described above is also configured by combining such a direct-viewing endoscope main body 1A and a side-view side image acquisition unit 50 that is detachable from the endoscope main body 1A. Similar to the embodiments described above, the luminance adjustment for reducing the luminance difference between images can be applied.
- the endoscope of the third embodiment Even if the endoscope of the third embodiment is used, the same effects as those of the first and second embodiments can be obtained, and only the endoscope main body 1A can be directly viewed as required. It can be used as a mirror. Alternatively, it is possible to realize a wide-angle endoscope capable of observing both the front field of view and the side field of view by using the side image acquisition unit 50 in combination with a general direct-view type endoscope. Become.
- the first subject image acquisition unit and the second subject image acquisition unit include, for example, an imaging optical system and an imaging element.
- the imaging optical system of these includes the endoscope 1 (or the endoscope).
- the image sensor may be disposed in the video processor 2 by being disposed in the main body 1A and the side image acquisition unit 50). In this case, an optical image formed by the imaging optical system may be transmitted to the imaging element in the video processor 2 via a transmission optical system or the like.
- the endoscope system has been mainly described.
- an operation method for operating the endoscope system as described above may be used, or a process for causing the computer to operate the endoscope system as described above. It may be a program, a non-temporary recording medium readable by a computer for recording the processing program, or the like.
- an endoscope system in particular, an endoscope system having a wide-angle endoscope having a direct-viewing observation optical system and a side-viewing observation optical system, a plurality of images having different fields of view. It is possible to observe an image with high visibility in which a luminance difference between adjacent portions of (image signal) is suppressed.
- the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.
- various aspects of the invention can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, you may delete some components from all the components shown by embodiment.
- the constituent elements over different embodiments may be appropriately combined.
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Abstract
Description
図1から図8は本発明の実施形態1を示したものであり、図1は内視鏡システムの構成を示す図である。
図9は本発明の実施形態2を示したものであり、内視鏡システムの構成を示す図である。この実施形態2において、上述の実施形態1と同様である部分については同一の符号を付すなどして説明を適宜省略し、主として異なる点についてのみ説明する。
図10および図11は本発明の実施形態3を示したものであり、図10は側方画像取得ユニット50が装着されている状態の内視鏡の構成を部分的に示す斜視図、図11は側方画像取得ユニット50が取り外されている状態の内視鏡の構成を部分的に示す斜視図である。
Claims (18)
- 同じ被検体内の異なる領域に対応する撮像信号に基づき第1の画像と第2の画像とを構成する画像構成部と、
前記第1の画像および前記第2の画像における輝度を検出する輝度検出部と、
隣接して配置される前記第1の画像と前記第2の画像との該隣接部分における輝度差が閾値以下になるように、前記第1の画像と前記第2の画像との少なくとも一方の輝度を調整する輝度制御部と、
を備えることを特徴とする内視鏡システム。 - 前記輝度制御部は、前記第1の画像と前記第2の画像とをそれぞれ複数の領域に分割して、分割した前記領域を単位として、前記輝度の調整を行うことを特徴とする請求項1に記載の内視鏡システム。
- 前記輝度検出部は、さらに、前記領域毎の平均輝度を算出し、
前記輝度制御部は、前記平均輝度に基づき前記輝度差を算出して前記閾値と比較し、前記輝度の調整を行うことを特徴とする請求項2に記載の内視鏡システム。 - 前記輝度制御部は、前記第1の画像と前記第2の画像との境界を挟んで隣接する2つの前記領域の内の、前記平均輝度が低い方の前記領域の輝度を上げるゲインアップと、前記平均輝度が高い方の前記領域の輝度を下げるゲインダウンと、の何れか一方を行うことにより前記輝度差が前記閾値以下になるように前記輝度の調整を行うものであり、前記輝度の調整を行った前記第1の画像または前記第2の画像内において、前記輝度の調整を行った前記領域の前記境界と反対側に隣接する前記領域に対しても前記輝度の調整を逐次行うことを特徴とする請求項3に記載の内視鏡システム。
- 前記輝度制御部は、前記第1の画像と前記第2の画像との前記境界を挟んで隣接する前記2つの前記領域の内の、前記平均輝度が低い方の前記領域の輝度が所定の下限輝度以上でかつ前記平均輝度が高い方の前記領域の輝度が所定の上限輝度よりも大きい場合に前記ゲインダウンを行い、それ以外の場合に前記ゲインアップを行うことを特徴とする請求項4に記載の内視鏡システム。
- 前記輝度制御部は、前記第1の画像と前記第2の画像との何れをも構成しない非画像画素については、前記輝度の調整を行わないことを特徴とする請求項2に記載の内視鏡システム。
- 前記輝度制御部は、前記第1の画像および前記第2の画像を、水平方向に複数分割した縦長矩形状、水平方向および垂直方向に複数分割した格子状、または径方向に複数分割した同心状の、複数の前記領域に分割することを特徴とする請求項2に記載の内視鏡システム。
- 前記被検体内の第1の領域に光を照射する第1の照明部と、
前記第1の領域とは異なる、前記被検体内の第2の領域に光を照射する第2の照明部と、
前記第1の照明部の光量と前記第2の照明部の光量とを独立に制御する照明制御部と、
をさらに備え、
前記輝度制御部は、前記照明制御部による光量制御を行った後に前記第1の領域に対応する第1の撮像信号から構成される前記第1の画像と、前記第2の領域に対応する第2の撮像信号から構成される前記第2の画像とに対して、前記輝度の調整を行うことを特徴とする請求項1に記載の内視鏡システム。 - 前記画像構成部により構成された、前記第1の画像と前記第2の画像とが隣接して配置された画像に基づき、表示信号を出力する画像出力部をさらに備えることを特徴とする請求項1に記載の内視鏡システム。
- 前記画像出力部は、前記第1の画像と前記第2の画像とを、1つの表示部に表示するための単一表示信号、または複数の表示部に表示するための複数表示信号として、前記表示信号を出力することを特徴とする請求項9に記載の内視鏡システム。
- 前記被検体の内部に挿入される挿入部と、
前記挿入部に設けられ、前記挿入部の長手方向に沿った前方を含む前記被検体内の第1の領域の第1の被検体像に係る第1の撮像信号を取得する第1の被検体像取得部と、
前記挿入部に設けられ、前記第1の領域とは異なる、前記挿入部の長手方向に交差する側方を含む前記被検体内の第2の領域の第2の被検体像に係る第2の撮像信号を取得する第2の被検体像取得部と、
をさらに備え、
前記画像構成部は、前記第1の撮像信号に基づき前記第1の画像を構成するとともに、前記第2の撮像信号に基づき前記第2の画像を構成することを特徴とする請求項9に記載の内視鏡システム。 - 前記第1の被検体像取得部は、前記挿入部の先端部に前方を向けて配置されており、
前記第2の被検体像取得部は、前記挿入部の周方向に向けて配置されており、
前記画像構成部は、前記第1の画像と前記第2の画像とが隣接して配置されるような前記画像を構成することを特徴とする請求項11に記載の内視鏡システム。 - 前記第2の被検体像取得部は、前記挿入部の周方向の複数の角度位置に複数配置されていて、複数の前記第2の被検体像に係る複数の第2の撮像信号を取得し、
前記画像構成部は、前記第1の撮像信号に基づく前記第1の画像が中心、複数の前記第2の撮像信号に基づく複数の前記第2の画像が前記第1の画像の周方向の前記複数の角度位置にそれぞれ配置されるような前記画像を構成することを特徴とする請求項12に記載の内視鏡システム。 - 前記第1の被検体像取得部は、前記挿入部の先端部に前方を向けて配置されており、
前記第2の被検体像取得部は、前記挿入部の周面部に周方向の所定の角度範囲の前記第2の被検体像に係る前記第2の撮像信号を取得可能に配置されていて、
前記画像構成部は、前記第1の画像を円形状に構成し、前記第2の画像を前記第1の画像の周囲を囲む円環における前記所定の角度範囲の形状に構成して、前記画像を構成することを特徴とする請求項11に記載の内視鏡システム。 - 前記被検体の内部に挿入される挿入部と、
前記挿入部に設けられ、前記被検体内の第1の領域から第1の被検体像に係る第1の撮像信号を取得する第1の被検体像取得部と、
前記挿入部に設けられ、前記第1の領域とは異なる前記被検体内の第2の領域から第2の被検体像に係る第2の撮像信号を取得する第2の被検体像取得部と、
をさらに備え、
前記画像構成部は、前記第1の撮像信号に基づき前記第1の画像を構成するとともに、前記第2の撮像信号に基づき前記第2の画像を構成し、
前記第1の被検体像取得部は、前記第1の被検体像を光電変換して前記第1の撮像信号を生成する第1の撮像部を含み、
前記第2の被検体像取得部は、前記第2の被検体像を光電変換して前記第2の撮像信号を生成するものであって、前記第1の撮像部とは別体の第2の撮像部を含み、
前記第1の撮像部と前記第2の撮像部とは、前記画像構成部に電気的に接続されていることを特徴とする請求項9に記載の内視鏡システム。 - 前記被検体の内部に挿入される挿入部と、
前記挿入部に設けられ、前記被検体内の第1の領域から第1の被検体像に係る第1の撮像信号を取得する第1の被検体像取得部と、
前記挿入部に設けられ、前記第1の領域とは異なる前記被検体内の第2の領域から第2の被検体像に係る第2の撮像信号を取得する第2の被検体像取得部と、
をさらに備え、
前記画像構成部は、前記第1の撮像信号に基づき前記第1の画像を構成するとともに、前記第2の撮像信号に基づき前記第2の画像を構成し、
前記第1の被検体像取得部と前記第2の被検体像取得部とは1つの撮像部を兼用して含み、前記第1の被検体像は前記撮像部の一部に結像して前記第1の撮像信号が生成され、前記第2の被検体像は前記撮像部の他の一部に結像して前記第2の撮像信号が生成され、
前記撮像部は、前記画像構成部に電気的に接続されていることを特徴とする請求項9に記載の内視鏡システム。 - 前記被検体の内部に挿入される挿入部と、
前記被検体内の第1の領域、および前記第1の領域とは異なる前記被検体内の第2の領域へ光を照射する照明部と、
前記挿入部に設けられ、前記第1の領域の第1の被検体像に係る第1の撮像信号を取得する第1の被検体像取得部と、
前記挿入部に設けられ、前記第2の領域の第2の被検体像に係る第2の撮像信号を取得する第2の被検体像取得部と、
をさらに備え、
前記画像構成部は、前記第1の撮像信号に基づき前記第1の画像を構成するとともに、前記第2の撮像信号に基づき前記第2の画像を構成し、
前記輝度検出部は、前記第1の画像の輝度と前記第2の画像の輝度とをそれぞれ検出することを特徴とする請求項1に記載の内視鏡システム。 - 被検体内の第1の領域、および前記第1の領域とは異なる前記被検体内の第2の領域へ光を照射する照明部を備える内視鏡システムの作動方法であって、
挿入部に設けられた第1の被検体像取得部が、前記第1の領域の第1の被検体像に係る第1の撮像信号を取得するステップと、
前記挿入部に設けられた第2の被検体像取得部が、前記第2の領域の第2の被検体像に係る第2の撮像信号を取得するステップと、
画像構成部が、前記第1の撮像信号に基づき第1の画像を構成するとともに、前記第2の撮像信号に基づき第2の画像を構成するステップと、
輝度検出部が、前記第1の画像の輝度と前記第2の画像の輝度とをそれぞれ検出するステップと、
輝度制御部が、隣接して配置される前記第1の画像と前記第2の画像との該隣接部分における輝度差が閾値以下になるように、前記第1の画像と前記第2の画像との少なくとも一方の輝度を調整するステップと、
を有することを特徴とする内視鏡システムの作動方法。
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