WO2015151663A1 - 医用画像処理装置及びその作動方法並びに内視鏡システム - Google Patents
医用画像処理装置及びその作動方法並びに内視鏡システム Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0012—Biomedical image inspection
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00009—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope
- A61B1/000094—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope extracting biological structures
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/041—Capsule endoscopes for imaging
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/07—Endoradiosondes
- A61B5/073—Intestinal transmitters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1032—Determining colour for diagnostic purposes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/42—Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems
- A61B5/4222—Evaluating particular parts, e.g. particular organs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/42—Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems
- A61B5/4222—Evaluating particular parts, e.g. particular organs
- A61B5/4238—Evaluating particular parts, e.g. particular organs stomach
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0012—Biomedical image inspection
- G06T7/0014—Biomedical image inspection using an image reference approach
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- G06—COMPUTING; CALCULATING OR COUNTING
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2576/00—Medical imaging apparatus involving image processing or analysis
- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/10068—Endoscopic image
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30096—Tumor; Lesion
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30101—Blood vessel; Artery; Vein; Vascular
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/843—Demosaicing, e.g. interpolating colour pixel values
Definitions
- Patent Document 1 a process in which the blood volume (hemoglobin index) is separated from the reference value is further separated from the reference value so that the color difference between the normal part and the lesioned part becomes clear. ing.
- the medical image processing apparatus of the present invention includes an image signal input processing unit that performs input processing on a first color image signal, a first signal ratio between two color image signals of the first color image signal, a first signal ratio, A signal ratio calculation unit that calculates a second signal ratio between image signals of two different colors, and a first range in which observation objects in the subject are distributed in a feature space formed by the first signal ratio and the second signal ratio. , A first process that processes the coordinates of the second range of the second range and the third range so as to move to the reference range defined in the feature space, and the second range does not move, A first movement processing unit that performs a second process for moving at least one of the coordinates and the coordinates of the third range.
- the coordinates of the second range it is preferable to move the coordinates of the second range to the reference range by changing the radius of the coordinates of the second range in the feature space.
- the angle of the coordinates of the first range and the angle of the coordinates of the third range are changed, and the coordinates of the first range and the coordinates of the third range are moved away from each other.
- the reference range is preferably a range that includes the origin of the feature space and does not include the first range and the third range.
- the first range is processed to move the coordinates of the second range to the reference range defined in the feature space, and the third range is moved while maintaining the coordinates of the first range in the feature space. It is preferable to provide the 2nd movement process part which performs the 3rd process processed so. In the third process, it is preferable to move the coordinates of the third range so that the hue of the second special image obtained from the first signal ratio and the second signal ratio after the first and third processes changes.
- the difference between the first range and the second range when the image signal of at least one color among the first color image signals is a narrowband signal is the difference between the case where the first color image signals are all wideband signals.
- the difference between the first range and the third range is greater than the difference between the first range and the second range, or when the image signal of at least one color of the first color image signals is a narrowband signal. It is preferable that the difference between the first range and the third range when one color image signal is a broadband signal is larger.
- the first signal ratio is correlated with the blood vessel depth, and the second signal ratio is correlated with the blood volume.
- the first signal ratio is preferably a B / G ratio, and the second signal ratio is preferably a G / R ratio.
- the operation method of the endoscope system is such that the image signal input processing unit inputs the first color image signal, and the signal ratio calculation unit determines whether the image signal between the two colors of the first color image signals.
- the first signal ratio, the step of calculating the second signal ratio between two color image signals different from the first signal ratio, and the first movement processing unit are formed with the first signal ratio and the second signal ratio.
- the first range is processed so that the coordinates of the second range among the first range, the second range, and the third range in which the observation target in the subject is distributed are moved to the reference range defined in the feature space. Performing a process and a second process for processing to move at least one of the coordinates of the first range and the coordinates of the third range without moving the second range.
- the present invention it is possible to generate an image in which the color difference between an abnormal part such as an atrophic part where the gastric mucosa is atrophic and a normal part is emphasized.
- the endoscope system 10 includes an endoscope 12, a light source device 14, a processor device 16, a monitor 18 (display unit), and a console 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 portion 12a to be inserted into a subject, an operation portion 12b provided at a proximal end portion of the insertion portion 12a, a bending portion 12c and a distal end portion 12d provided at the distal end side of the insertion portion 12a. have.
- the angle knob 12e of the operation unit 12b By operating the angle knob 12e of the operation unit 12b, the bending unit 12c performs a bending operation. With this bending operation, the tip 12d is directed in a desired direction.
- the operation unit 12b is provided with a mode switching SW 13a.
- the mode switching SW 13a is used for a switching operation among four types of modes: a normal observation mode, a first special observation mode, a second special observation mode, and a simultaneous observation mode.
- the normal observation mode is a mode for displaying a normal image on the monitor 18.
- the first special observation mode is a mode in which a first special image is displayed on the monitor 18 and is used for observing a boundary between an atrophic part and a normal part in which gastric mucosa has atrophy due to a lesion such as gastric cancer.
- the second special observation mode is a mode for displaying the second special image on the monitor 18 and is used for observing the color difference between the atrophy part and the normal part.
- the simultaneous observation mode is used for simultaneously observing the boundary between the atrophy part and the normal part and observing the color difference between the atrophy part and the normal part.
- the first special image and the second special image are displayed on the monitor 18. This is a mode for simultaneous display.
- the processor device 16 is electrically connected to the monitor 18 and the console 19.
- the monitor 18 outputs and displays image information and the like.
- the console 19 functions as a UI (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 image information and the like.
- the light source device 14 includes a V-LED (Violet Light Emitting Diode) 20a, a B-LED (Blue Light Light Emitting Diode) 20b, a G-LED (Green Light Light Emitting Diode) 20c, and an R-LED (Red).
- V-LED Vehicle Light Emitting Diode
- B-LED Blue Light Light Emitting Diode
- G-LED Green Light Light Emitting Diode
- R-LED Red
- (Light Emitting Diode) 20d the light source control unit 21 for controlling the driving of the four color LEDs 20a to 20d
- an optical path coupling unit 23 for coupling the optical paths of the four color lights emitted from the four color LEDs 20a to 20d.
- the light coupled by the optical path coupling unit 23 is irradiated into the subject through the light guide 41 and the illumination lens 45 inserted into the insertion unit 12a.
- An LD Laser Diode
- the light source control unit 21 performs the V-LED 20a, the B-LED 20b, the G-LED 20c, and the R-LED 20d in any of the normal observation mode, the first special observation mode, the second special observation mode, and the simultaneous observation mode. Lights up. Accordingly, the observation target is irradiated with light in which four colors of light of purple light V, blue light B, green light G, and red light R are mixed. In the normal observation mode, the light source control unit 21 controls the LEDs 20a to 20d so that the light quantity ratio among the violet light V, blue light B, green light G, and red light R is Vc: Bc: Gc: Rc. Control.
- 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 combined light propagates to the distal end portion 12d of the endoscope 12.
- a multimode fiber can be used as the light guide 41.
- a thin fiber cable having a core diameter of 105 ⁇ m, a cladding diameter of 125 ⁇ m, and a diameter of ⁇ 0.3 to 0.5 mm including a protective layer serving as an outer shell can be used.
- the imaging sensor 48 is a color imaging sensor that captures a reflected image of the subject and outputs an image signal.
- the image sensor 48 is preferably a CCD (Charge-Coupled Device) image sensor, a CMOS (Complementary Metal-Oxide Semiconductor) image sensor, or the like.
- the image sensor 48 used in the present invention is a color image sensor for obtaining RGB image signals of three colors of R (red), G (green), and B (blue), that is, an R pixel provided with an R filter.
- a so-called RGB imaging sensor including a G pixel provided with a G filter and a B pixel provided with a B filter.
- the Log converter 71 performs Log conversion on each of the first RGB image signals (corresponding to the “first color image signal” of the present invention). As a result, an R image signal (logR) after Log conversion, a G image signal (logG) after Log conversion, and a B image signal (logB) after Log conversion are obtained.
- “B / G ratio” represents a value obtained by omitting “-log” in ⁇ log (B / G).
- the polar coordinate conversion unit 73 converts the B / G ratio and G / R ratio obtained by the signal ratio calculation unit 72 into a radius r and an angle ⁇ . In the polar coordinate conversion unit 73, conversion to the radius r and the angle ⁇ is performed for all pixels.
- the radial expansion / compression unit 74 performs a first process of expanding / compressing the radial r based on the radial r and the angle ⁇ converted by the polar coordinate conversion unit 73.
- the angle expanding / compressing unit 75 performs a second process of expanding and compressing the angle ⁇ based on the moving radius r and the angle ⁇ that have been first processed by the moving radius expanding / compressing unit 74. Details of these first and second processes will be described later.
- the first range (indicated as “first” in FIG. 10) and the third range (indicated as “third” in FIG. 10)
- the first range and the third range are close to each other.
- FIG. 10B while the coordinates of the second range are maintained in the reference range, most of the coordinates of the first range move to the second quadrant of the feature space. Most of the coordinates of the third range move to the fourth quadrant of the feature space. As a result, the coordinates of the first range, the second range, and the third range are completely separated.
- the boundary between the atrophic mucosa and the atrophic part including a deep blood vessel that is being seen through atrophy under the atrophic mucosa and the normal part where the normal mucosa is present is clarified. Is displayed.
- the angle ⁇ is changed to an angle E ⁇ that is smaller than the angle ⁇ within the angle change range R3.
- an expansion process is performed in which the angle change rate is changed at an angle change rate Wx greater than “1”, and the angle of the range R3y exceeding the range R3x
- a compression process is performed in which the angle change rate is changed at an angle change rate Wy smaller than “1”.
- the second special image obtained after the third processing is displayed while maintaining the color of the normal part, while the atrophic mucosa is displayed in a fading tone among the atrophic parts where atrophic gastritis has occurred.
- the color of the deep blood vessel that is seen through due to atrophy under the atrophic mucosa changes from red to a color such as magenta, so that it can be clearly displayed. Therefore, since the second special image is displayed in the original color when atrophic gastritis occurs, the difference in color between the normal part and the atrophic part is clear.
- the simultaneous display image processing unit 64c generates a simultaneous display special image based on the first special image and the second special image generated by the first special image processing unit 64a and the second special image processing unit 64b.
- the monitor 18 displays the first special image on one side and the second special image on the other side based on the special image for simultaneous display.
- the first special image is an image that makes it easy to grasp the position of the atrophic part because the boundary between the normal part and the atrophic part is very clear, but the normal part is not the color of the original stomach mucous membrane Since it is displayed in a pseudo color, the image is uncomfortable for the doctor.
- the first special observation mode in the feature space formed by the B / G ratio and the G / R ratio, the coordinates of the first range in which the normal mucous membrane is distributed and the atrophic gastritis
- the second range in which the atrophic mucosa atrophied due to atrophic gastritis is distributed is moved to the reference range in the state where the coordinates of the third range in which the deep blood vessels that are seen with atrophy are distributed are present under the atrophied mucosa.
- the first process is performed. After this first process, a second process is performed in which the coordinates of the first range and the coordinates of the third range are moved away from each other.
- a first special image is generated based on the B / G ratio and G / R ratio after the first process and the second process. This first special image is displayed on the monitor 18.
- the broadband light source 202 is a xenon lamp, a white LED or the like, and emits white light having a wavelength range from blue to red.
- the rotary filter 204 includes a normal observation mode filter 208 provided inside and a special observation mode filter 209 provided outside (see FIG. 20).
- the filter switching unit 205 moves the rotary filter 204 in the radial direction, and when the normal switching mode is set by the mode switching SW 13a, the normal observation mode filter 208 of the rotary filter 204 is inserted into the white light path.
- the special observation mode filter 209 of the rotation filter 204 is inserted into the optical path of white light.
- the endoscope system 200 in the normal observation mode, the inside of the specimen is imaged by the monochrome imaging sensor 206 every time blue light, green light, and red light are irradiated on the observation target. Thereby, RGB image signals of three colors are obtained. Based on the RGB image signals, a normal image is generated by the same method as in the first embodiment.
- the transmitting / receiving antenna 304 is affixed to the body of the subject and receives the RGB image signal from the transmitting antenna 302d.
- the transmission / reception antenna 304 transmits the received RGB image signal to the capsule receiver 306 wirelessly.
- the capsule receiving device 306 is connected to the receiving unit 53 of the processor device 16 and transmits the RGB image signal from the transmitting / receiving antenna 304 to the receiving unit 53.
- the B / G ratio and the G / R ratio are converted into the moving radius r and the angle ⁇ by polar coordinate conversion, and the first and second processes are performed based on the converted moving radius r and the angle ⁇ , or The first process and the third process were performed, and then returned to the B / G ratio and the G / R ratio again.
- the B / G ratio, G / R The R ratio may be directly converted into the B / G ratio or G / R ratio that has been subjected to the first or second processing, or the first and third processing, without performing polar coordinate conversion or the like.
- the B / G ratio and the G / R ratio are obtained from the first RGB image signal, and the feature space is formed by the obtained B / G ratio and G / R ratio.
- the wavelength band exceeds a wideband light (for example, having a half-value width of 20 nm).
- the difference between the first range and the second range on the feature space and the difference between the first range and the third range are larger than in the case of a broadband signal obtained from light.
- the difference D12n between the average value AXn of “Xn” and the average value AR1 of the first range is larger than the difference D12b between the average value AXb of “Xb” and the average value AR1 of the first range.
- the difference D13n between the average value AYn of “Yn” and the average value AR1 of the first range is larger than the difference D13b between the average value AXb of “Yb” and the first range AR1.
- the present invention is not limited to the endoscope system as in the first to third embodiments and the processor device incorporated in the capsule endoscope system as in the fourth embodiment, and various medical image processing apparatuses. It is possible to apply.
Abstract
Description
図1に示すように、第1実施形態の内視鏡システム10は、内視鏡12と、光源装置14と、プロセッサ装置16と、モニタ18(表示部)と、コンソール19とを有する。内視鏡12は光源装置14と光学的に接続されるとともに、プロセッサ装置16と電気的に接続される。内視鏡12は、被検体内に挿入される挿入部12aと、挿入部12aの基端部分に設けられた操作部12bと、挿入部12aの先端側に設けられる湾曲部12c及び先端部12dを有している。操作部12bのアングルノブ12eを操作することにより、湾曲部12cは湾曲動作する。この湾曲動作に伴って、先端部12dが所望の方向に向けられる。
(E1):R*=第2R画像信号の画素値×Yin/Yout
(E2):G*=第2G画像信号の画素値×Yin/Yout
(E3):B*=第2B画像信号の画素値×Yin/Yout
なお、「R*」は明るさ調整後の第2R画像信号を、「G*」は明るさ調整後の第2G画像信号を、「B*」は明るさ調整後の第2B画像信号を表している。また、「kr」、「kg」、「kb」は「0」~「1」の範囲にある任意の定数である。
第2実施形態では、第1実施形態で示した4色のLED20a~20dの代わりに、レーザ光源と蛍光体を用いて観察対象の照明を行う。それ以外については、第1実施形態と同様である。
第3実施形態では、第1実施形態で示した4色のLED20a~20dの代わりに、キセノンランプなどの広帯域光源と回転フィルタを用いて観察対象の照明を行う。また、カラーの撮像センサ48に代えて、モノクロの撮像センサで観察対象の撮像を行う。それ以外については、第1実施形態と同様である。
第4実施形態では、挿入型の内視鏡12及び光源装置14に代えて、飲み込み式のカプセル内視鏡を用いて、通常画像、第1又は第2特殊画像の生成に必要なRGB画像信号を取得する。
16 プロセッサ装置(医用画像処理装置)
72 信号比算出部
64a 第1特殊画像処理部
64b 第2特殊画像処理部
74 動径拡張・圧縮部
75 角度拡張・圧縮部
77 RGB変換部(カラー画像信号変換部)
81 明るさ調整部
Claims (12)
- 第1カラー画像信号を入力処理する画像信号入力処理部と、
前記第1カラー画像信号のうち2色の画像信号間の第1信号比と、前記第1信号比と異なる2色の画像信号間の第2信号比を算出する信号比算出部と、
前記第1信号比と前記第2信号比で形成される特徴空間において、被検体内の観察対象が分布する第1範囲、第2範囲、及び第3範囲のうち第2範囲の座標を、前記特徴空間内に定める基準範囲に移動するように処理する第1処理と、前記第2範囲は移動せずに、前記第1範囲の座標と前記第3範囲の座標のうち少なくとも一方を移動するように処理する第2処理とを行う第1移動処理部と、
を備える医用画像処理装置。 - 前記第1処理は、前記特徴空間において、前記第2範囲の座標の動径を変更して、前記第2範囲の座標を前記基準範囲に移動させる請求項1記載の医用画像処理装置。
- 前記第2処理は、前記特徴空間において、前記第1範囲の座標の角度と前記第3範囲の座標の角度とを変更して、前記第1範囲の座標と前記第3範囲の座標とが互いに離れるように移動させる請求項1または2記載の医用画像処理装置。
- 前記基準範囲は、前記特徴空間の原点を含み、且つ、前記第1範囲及び前記第3範囲を含まない範囲である請求項1ないし3いずれか1項記載の医用画像処理装置。
- 前記特徴空間において、前記第2範囲の座標を、前記特徴空間内に定める基準範囲に移動するように処理する第1処理と、前記特徴空間において、前記第1範囲の座標を維持した状態で、前記第3範囲を移動するように処理する第3処理を行う第2移動処理部を備える請求項1ないし4いずれか1項記載の医用画像処理装置。
- 前記第3処理では、前記第1及び第3処理後の第1信号比及び第2信号比から得られる第2特殊画像の色相が変化するように、前記第3範囲の座標を移動させる請求項5記載の医用画像処理装置。
- 前記第1及び第2処理後の第1信号比及び第2信号比を第2カラー画像信号に変換し、又は前記第1及び第3処理後の第1信号比及び第2信号比を第2カラー画像信号に変換するカラー画像信号変換部と、
前記第1カラー画像信号から得られる第1明るさ情報及び前記第2カラー画像信号から得られる第2明るさ情報から、前記第2カラー画像信号の画素値を調整する明るさ調整部とを有する請求項5または6記載の医用画像処理装置。 - 前記特徴空間において、前記第1カラー画像信号のうち少なくとも1色の画像信号が狭帯域信号である場合の前記第1範囲と前記第2範囲との差は、前記第1カラー画像信号が全て広帯域信号である場合の前記第1範囲と前記第2範囲との差よりも大きい、又は、前記第1カラー画像信号のうち少なくとも1色の画像信号が狭帯域信号である場合の前記第1範囲と前記第3範囲との差は、前記第1カラー画像信号が全て広帯域信号である場合の前記第1範囲と前記第3範囲との差よりも大きい請求項1ないし7いずれか1項記載の医用画像処理装置。
- 前記第1信号比は血管深さと相関があり、前記第2信号比は血液量と相関がある請求項1ないし8いずれか1項記載の医用画像処理装置。
- 前記第1信号比はB/G比で、前記第2信号比はG/R比である請求項9記載の医用画像処理装置。
- 請求項5記載の医用画像処理装置と、
前記第1及び第2処理後の第1及び第2信号比から得られる第1特殊画像と前記第1及び第3処理後の第1信号比及び第2信号比から得られる第2特殊画像を表示する表示部と、
を備える内視鏡システム。 - 画像信号入力処理部が、第1カラー画像信号を入力処理するステップと、
信号比算出部が、前記第1カラー画像信号のうち2色の画像信号間の第1信号比と、前記第1信号比と異なる2色の画像信号間の第2信号比を算出するステップと、
第1移動処理部が、前記第1信号比と前記第2信号比で形成される特徴空間において、被検体内の観察対象が分布する第1範囲、第2範囲、及び第3範囲のうち第2範囲の座標を、前記特徴空間内に定める基準範囲に移動するように処理する第1処理と、前記第2範囲は移動せずに、前記第1範囲の座標と前記第3範囲の座標のうち少なくとも一方を移動するように処理する第2処理とを行うステップと、
を有する医用画像処理装置の作動方法。
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