DE102011001200A1 - Method for controlling illumination of medical object, involves detecting shutter signals determined from controller, and controlling illumination of object based on function of signals, where signals indicate durations of exposure interval - Google Patents

Method for controlling illumination of medical object, involves detecting shutter signals determined from controller, and controlling illumination of object based on function of signals, where signals indicate durations of exposure interval

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Publication number
DE102011001200A1
DE102011001200A1 DE201110001200 DE102011001200A DE102011001200A1 DE 102011001200 A1 DE102011001200 A1 DE 102011001200A1 DE 201110001200 DE201110001200 DE 201110001200 DE 102011001200 A DE102011001200 A DE 102011001200A DE 102011001200 A1 DE102011001200 A1 DE 102011001200A1
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DE
Germany
Prior art keywords
light
exposure
signal
image sensor
object
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE201110001200
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German (de)
Inventor
Thomas Hinding
Dr. Irion Klaus
Klaus Roth
Peter Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Storz SE and Co KG
Original Assignee
Karl Storz SE and Co KG
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Publication date
Priority to DE102010010974 priority Critical
Priority to DE102010010974.6 priority
Application filed by Karl Storz SE and Co KG filed Critical Karl Storz SE and Co KG
Priority to DE201110001200 priority patent/DE102011001200A1/en
Publication of DE102011001200A1 publication Critical patent/DE102011001200A1/en
Application status is Pending legal-status Critical

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B23/00Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407Optical details
    • G02B23/2461Illumination
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments 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
    • A61B1/04Instruments 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments 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
    • A61B1/06Instruments 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 with illuminating arrangements
    • A61B1/0661Endoscope light sources
    • A61B1/0669Endoscope light sources at proximal end of an endoscope
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments 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
    • A61B1/06Instruments 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 with illuminating arrangements
    • A61B1/0661Endoscope light sources
    • A61B1/0684Endoscope light sources using light emitting diodes [LED]
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B23/00Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2476Non-optical details, e.g. housings, mountings, supports
    • G02B23/2484Arrangements in relation to a camera or imaging device
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/2353Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor by influencing the exposure time, e.g. shutter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/2354Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor by influencing the scene brightness using illuminating means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N2005/2255Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscope, borescope

Abstract

The method involves detecting an endoscope (20) or exoscope and a light sensitive image sensor (31). Durations of exposure interval within photons falling on the image sensor are determined by a camera controller (40). A picture signal is produced by the image sensor. Shutter signals determined from the camera controller are detected, where the shutter signals indicate the durations of the exposure interval. Illumination of a medical object (12) is controlled based on function of the shutter signals by controlling multiple inorganic or organic LEDs (56) or semiconductor sources of light. Independent claims are also included for the following: (1) a lighting controller for controlling illumination of an object comprising an exposure signal input for receiving an exposure signal (2) a camera controller for a light sensitive image sensor for controlling duration of exposure interval (3) a computer program comprising a set of instructions for executing a method for controlling illumination of an object (4) a configuration pattern for configurable arrangement of logic gates.

Description

  • The present invention relates to a method and a lighting controller for controlling a lighting of a medical object detected by a photosensitive image sensor of a camera on a camera controller and a computer program for controlling said method.
  • First endoscopic examinations took place without a camera. The image transmitted by an endoscope out of a cavity in the human body was captured directly by the eye of a female doctor on the eyepiece. In order to support and not overcharge the ability of the human eye to adapt to changing image brightness, the distance of the distal light exit surface from the object under consideration and / or the light output of a proximal light source could be changed.
  • Later cameras were introduced in endoscopy. To adjust the brightness of the image captured by a camera, a mechanical diaphragm or a gray wedge was first used in the illumination beam path. In the electromotive drive, the image brightness could be controlled by a control loop to a setpoint. However, due to the inertia of the electromotive drive, image brightness often could not be controlled fast enough.
  • A modern camera or its camera control usually has a shutter device that can be controlled from frame to frame and thus extremely fast to set a desired image brightness. The shutting device determines the duration of an exposure interval within which photons falling on the image sensor or the image sensors of the camera influence an image signal generated by the image sensor. Photons falling on the image sensor outside of the exposure interval or the charges generated by them are discarded. The duration of an exposure interval can be set as desired from a maximum duration, determined essentially by the image repetition frequency, to a minimum duration. The maximum duration, for example, at 50 frames per second is just under 20 ms, the minimum duration is for example 1 / 10,000 s = 100 μs or 1 / 100,000 s = 10 μs.
  • An advantage of regulating an image brightness by means of a shut-off device is the minimum delay time of the control loop. The brightness of a captured image already influences the shutter and the brightness of the image during the immediately after capture. Even with a very rapid change in the distance of the distal end of an endoscope from the object under consideration, a nearly constant image brightness can thus be achieved on the monitor.
  • A disadvantage, however, is that the object is illuminated in each case with a maximum amount of light. Although only light within the visible to the human eye spectral range is transmitted to the distal end of an endoscope. IR and UV components of the emission of the light source are largely or completely blocked by appropriate filters. Nevertheless, the intensity of light exiting the distal end of the endoscope is so high that damage can be produced if the distal end of tissue or other objects is too narrow. For example, tissue can be thermally damaged. Also of the inflammation of a surgical drape, on which an endoscope was discarded carelessly, has already been reported.
  • It is an object of the present invention to provide an improved method and lighting control for controlling a medical object illuminated by a photosensitive image sensor, improved camera control, an improved computer program, and an improved configuration pattern for a configurable array of logic gates to accomplish.
  • This object is solved by the subject matters of the independent claims.
  • Further developments are specified in the dependent claims.
  • In a method of controlling a lighting of an object detected by an endoscope or an exoscope and by a photosensitive image sensor, a camera control determines the duration of an exposure interval within which photons falling on the image sensor affect an image signal generated by the image sensor detects a shutter signal determined by the camera control, which represents the duration of the exposure interval, and controls the illumination of the object in response to the shutter signal.
  • The object is in particular a medical object, ie an object in or on a human or animal body, which is observed by means of the endoscope or the exoscope and by means of the photosensitive image sensor. Alternatively, the object is a technical object, for example a component of a turbine, which is optically inspected by means of the endoscope and the photosensitive image sensor.
  • An exoscope is a device intended and designed for extracorporeal use for visually inspecting or viewing objects in medicine, in particular objects on or near outer surfaces of a human or animal body. Unlike an endoscope, an exoscope is not designed to be inserted through a small natural or artificial opening into a natural or artificial cavity. Rather, an exoscope is designed for viewing an object that is visible from the outside, at least during viewing, in particular during an operation. Accordingly, the exoscope is during its intended use completely outside of the human or animal body and, unlike the endoscope does not necessarily have a long thin shaft.
  • An exoscope can be one or two cameras or photosensitive image sensors for two-dimensional or three-dimensional detection and display, for example on a screen. Alternatively, an exoscope is monocular or binocular for direct viewing with the human eye. An exoscope is usually designed or optimized for a subject distance in the range of a few or a few centimeters or a few decimeters. An exoscope can have a high magnification, which allows a resolution that is not accessible to the naked eye, and thus have properties of a magnifying glass or a stereo microscope or a microscope or stereomicroscope. From the microscope or stereomicroscope, the exoscope usually differs by a larger object width.
  • The illumination of the object takes place in particular via the endoscope or the exoscope. The light used for illuminating the medical object is generated by one or more light-emitting diodes and / or one or more other light sources, in particular semiconductor-based light sources. The light source or light sources may be arranged at the distal end of the endoscope or the exoscope. Alternatively, the light source or the light sources can be coupled to the proximal end of the endoscope or exoscope via a light guide cable or arranged directly at the proximal end, wherein the light for illuminating the object is, for example, by means of one or more optical waveguides from the proximal end to the distal end of the endoscope of the exoscope.
  • With light, electromagnetic radiation within the spectral range visible to the human eye is referred to above all, but also electromagnetic radiation in the adjacent spectral ranges, in particular in the ultraviolet and in the infrared.
  • The shutter signal is, for example, a signal generated by the camera controller which directly or indirectly controls the duration of the exposure interval, in particular its beginning and end. For example, the shutter signal directly or indirectly controls circuits of the photosensitive image sensor, by means of which the charges generated by photons before the beginning of the exposure interval are deleted or discarded and / or by means of which the generation of further charges is suppressed or generated after the end of the exposure interval Charges are discarded or derived, and / or by means of which at the end of the exposure interval, a readout of the photosensitive image sensor or generating analog or digital signals indicating the photon generated and previously stored charges. In addition to numerous other technical variants, the shutter signal can control a mechanical shutter, a liquid crystal device or another device spatially separate from the photosensitive image sensor for the switchable interruption of the light flow to the photosensitive image sensor. The photosensitive image sensor is, for example, a CCD sensor (CCD = charge-coupled device) or a CMOS sensor (CMOS = complementary metal oxide semiconductor).
  • The shutter signal may comprise one or more arbitrarily encoded electrical or optical individual signals which are transmitted via one or more electrical lines. For example, the shutter signal comprises a signal applied to a first electrical line having a predetermined edge indicative of the beginning of the exposure interval, and a second signal applied to a second electrical line having a predetermined edge indicative of the end of the exposure interval. Alternatively, the shutter signal includes, for example, an electrical signal having a predetermined rising edge indicating the beginning of the exposure interval and a predetermined falling edge indicating the end of the exposure interval, or vice versa.
  • The shutter signal can be generated by a camera controller which is directly and inseparably connected to the photosensitive image sensor, in particular with this in a package or on a die (in particular on a semiconductor crystal) is integrated. Alternatively, the shutter signal is generated by a camera controller coupled to the spatially-spaced photosensitive image sensor via an electrical or optical cable. The camera control is in particular designed to to receive the electrical or optical signal (raw video signal) produced by the photosensitive image sensor and the acquired image, to determine an image brightness weighted or unweighted averaged over the entire acquired image or over one or more regions of the image and compared to a target value, depending on the Result of the comparison to determine the duration of the exposure interval for the next image to be acquired and to generate the shutter signal accordingly.
  • The shutter signal can be output by the camera control system directly or after being processed or converted into an exposure signal. The control of the illumination can be effected directly by the exposure signal, in particular directly by the shutter signal, or indirectly by a control signal generated by the exposure signal by conversion or conditioning. In any case, the lighting is controlled by means of a control signal formed by the shutter signal itself or formed by another exposure signal already generated by the camera control from the shutter signal, or by a control signal obtained from the exposure signal by (re) conversion . Processing emerges.
  • One advantage of many variants of the method described or not described here is that it uses a control already implemented in camera control. The camera control and in particular the control implemented in it may under certain circumstances remain largely or completely unchanged. Effort and costs of implementing the method can therefore be low. Moreover, the control of the duration of the exposure interval carried out by the camera control is particularly fast. As a rule, the delay time or latency is only the time interval between the acquisition of two successive images. At 50 frames per second, this is just 20 ms. Another advantage is that the illumination of the object in response to the shutter signal can be controlled so that no effect on the exposure control loop of the camera and the camera control. Examples are given below.
  • In a method as described herein, controlling the lighting may include controlling a light source device to generate illumination light to illuminate the object. The light source device is particularly quickly controlled. With a fast controllability is meant a modulability of the generated radiation power on the time scale relevant for the exposure control. In particular, within an exposure interval with the maximum duration (in the above example: 20 ms), the light source device can be switched on or off or its radiant power can be significantly changed, for example from 50% to 100% and then again from 100% to 50% of the maximum radiant power ,
  • In general, it is advantageous if the radiation power can be modulated (in particular switched on and off) much faster, for example within one-tenth or one hundredth or even smaller fraction of the maximum duration of the exposure interval. If the shortest duration of the exposure interval, as mentioned above, is 100 μs or 10 μs, the radiation power of the light source device can in particular likewise be switched on and off again within 100 μs or within 10 μs. In the modulation of the radiation power, the spectral properties of the light provided by the light source device, for example its color temperature, in particular remain unchanged or substantially unchanged.
  • In this case, the generation of light or the light emission of a light source and / or by means of a diaphragm or another device of the light source provided by the light source device can be controlled. Alternatively or additionally, the illumination of the object can be controlled by a device spaced apart from the light source device in the illumination beam path, for example by a diaphragm. These and other variants rely on the exposure control already implemented by the camera and / or camera control. They therefore have the already mentioned advantages of a short delay time and the possibility of an inexpensive and cost-effective implementation.
  • A light source device may be a separate device spatially spaced from the endoscope or from the exoscope and coupled thereto via a light guide cable. Alternatively, the light source device can be integrated at the proximal end or at the distal end of the endoscope or the exoscope. Furthermore, the light source device can consist of several elements, each of which can be provided as separate units or integrated in the endoscope or in the exoscope at the proximal end or at the distal end.
  • In particular, the shutter signal indicates a beginning and an end of the exposure interval. Controlling the illumination therefore comprises in particular interrupting the radiation power generated by the light source device or the luminous flux generated by the light source device between two successive exposure intervals. Alternatively, the luminous flux provided by the light source device in the Light source device or at another location in the illumination beam path between two consecutive exposure intervals interrupted.
  • An advantage of interrupting the generated or provided luminous flux directed to the object is that the average power output and thus also the average power consumption of the light source device and / or the average power transmitted by illuminating the object is reduced. In this case, the radiation power, which is generated and provided by the light source device and directed to the object via the illumination beam path, can be unchanged within the exposure interval, in particular maximally. As a result, the brightness of the image captured by the camera within the exposure interval can also be unchanged and repercussions on the exposure control circuit can be avoided. At the same time, the thermal and / or photochemical stress of the object can be reduced by the illumination light.
  • In particular, the light source device is controlled such that it provides illumination light only within the exposure interval specified by the shutter signal. In particular, the light source device is controlled to provide illumination light within the entire exposure interval or within one or more time intervals within the exposure interval.
  • In particular, a light source of the light source device is turned on at the beginning of the exposure interval and turned off at the end of the exposure interval. Alternatively, the radiant power provided by the light source device and / or the radiant power transmitted to the object is otherwise turned on at the beginning of the exposure interval and turned off at the end of the exposure interval.
  • The described synchronization of the illumination with the exposure interval allows an optimum of the already mentioned advantages of an unchanged image brightness and freedom from interference on the exposure control circuit and a minimization of the thermal and / or photochemical loading of the object.
  • In a method as described herein, controlling the lighting may include controlling one or more inorganic or organic light emitting diodes or other semiconductor light sources, wherein a light emitting diode may also be formed as a diode laser, in particular as a laser diode. In particular, the light-emitting diode or the light-emitting diodes can be switched on and off as a function of the shutter signal.
  • An advantage of the use of LEDs is that the radiation power generated by them can be modulated almost arbitrarily fast, in particular switched on and off. In particular, the radiation power generated by a light-emitting diode can generally be switched on and off again within an exposure interval having a duration of 100 μs or 10 μs. Another advantage of many light-emitting diodes is that color temperature and other spectral properties of the light generated are not or not significantly changed even with a modulation, especially since the switching on and off usually can take place extremely quickly.
  • The light emitting diode or the LEDs can be operated with a current that is greater than their rated current. If the light-emitting diode or the light-emitting diodes are switched off between two successive exposure intervals, in particular only within an exposure interval, they can be operated with unchanged or almost unchanged thermal stress within the exposure intervals with significantly increased currents. Thus, the radiation power generated by the light-emitting diode or the light-emitting diodes can be increased within the exposure intervals.
  • In a method as described herein, the lighting may be controlled so as to illuminate the object in successive exposure intervals with illuminating light having different spectrums. For example, at an exposure of 50 fields per second, the object is illuminated alternately with white light and with excitation light in successive exposure intervals, the spectrum of which is suitable for exciting fluorescence and has the least possible overlap with the spectrum of the fluorescent light. Instead of fields, frames can also be captured alternately when illuminated with white light and with excitation light. Both the whitish and the excitation light can each be generated by means of light-emitting diodes, diode lasers or other lasers or by means of other light sources.
  • The alternating acquisition of images in white light and fluorescence allows a realistic representation of the detected object and at the same time a marking of areas in which there is a reduced or increased fluorescence and, for example, indicates a pathological change of tissue.
  • In particular, in a first exposure interval by means of one or more first LEDs illumination light is generated with a perceived by the human eye as white spectrum, and in a second exposure interval by means of one or more light emitting diodes or diode lasers illumination light is generated with an excitation spectrum for exciting fluorescence. Narrow-band, in particular monochromatic or approximately monochromatic illumination light, which is suitable for exciting fluorescence, and at the same time as small as possible overlapping with the spectrum of the fluorescent light, can be produced, in particular, by light-emitting diodes which have a photonic grating or are combined with a photonic grating.
  • The alternately used light sources for generating illumination light with different spectrums can be designed to generate different light fluxes. In addition, viewed objects for the different spectra can have very different reflectance levels (for example, reflectance or fluorescence yields). Furthermore, both the illumination beam path and the observation beam path for different wavelengths or spectra can each have different transparencies or different transmittances. Further, the photosensitive image sensor may have different sensitivities for different wavelengths or spectra. For these and other reasons, the images captured when illuminated with illumination light having different spectra may have undesirably different brightnesses.
  • It may therefore be advantageous for correction to use exposure intervals of different durations to acquire images when illuminating an object with illumination light having different spectrums. However, conventional camera control is usually not designed to capture images in alternate lighting situations. Conventional camera control is therefore usually not designed to control two or more different exposure intervals alternately and independently. In the case of alternate illumination of the imaged object with different intensities I 1 , I 2 , a conventional camera control generates, for example, a shutter signal which approximately corresponds to an average intensity I m = (I 1 + I 2 ) / 2. In particular, in order to use a conventional camera control, it may therefore be advantageous to operate one of several alternately operated light sources with different spectra within a shorter time interval in order to cause the same image brightness for the same duration of the exposure interval.
  • In a method as described herein, and in which the object is illuminated with illumination light having different spectra at successive exposure intervals, illumination light having different spectra within illumination intervals whose intersections with the exposure intervals are different in size can be directed onto the object.
  • In particular, the illumination intervals are each completely within or substantially completely within the exposure intervals and have different lengths.
  • By illuminating the object with different spectra within illumination intervals of different lengths and / or within illumination intervals which have differently large intersections with the exposure intervals, despite different radiation fluxes at the different spectra (in particular at different intensities or brightnesses of different light sources), despite different remission degrees ( in particular reflectivities and fluorescence yields) of the object with illumination with different spectra, despite different transmittances of the illumination beam path, despite different transmittances of the observation beam path, despite different sensitivities of the photosensitive image sensor equal image brightnesses or image brightnesses with a desired ratio are generated.
  • In particular, a first illumination interval for illumination light having a first spectrum and a second illumination interval for illumination light having a second spectrum are set such that the intersection of the first illumination interval with the exposure interval is smaller than the intersection of the second illumination interval with the exposure interval.
  • In particular, the second illumination interval is set to correspond to the exposure interval.
  • In particular, the first illumination interval and the second illumination interval are adjusted such that the ratio of the duration of the first illumination interval to the duration of the second illumination interval corresponds to the ratio of the intensity of the illumination light to the second spectrum to the intensity of the illumination light to the first spectrum. Alternatively, the first illumination interval and the second illumination interval are set, for example, such that the ratio of the duration of the first illumination interval to the duration of the second illumination interval corresponds to the first illumination interval Product of several ratios or fractions corresponds. In particular, can flow
    • The ratio of the radiation flux coupled into the illumination beam path when illuminated with the second spectrum and the radiation flux coupled into the illumination beam path when illuminated with the first spectrum;
    • The ratio of the transmittance of the illumination beam path for illumination light to the second spectrum and the transmittance of the illumination beam path for illumination light to the first spectrum;
    • The ratio of the remission degree of the object when illuminated with the second spectrum and the remission degree of the object when illuminated with the first spectrum;
    • The ratio of the transmittance of the observation beam path for the light remitted with the second spectrum when illuminated with illumination light and the transmittance of the observation beam path for the light remitted with the first spectrum when illuminated with illumination light;
    • The ratio of the sensitivities, in particular the quantum efficiencies, of the light-sensitive image sensor for the light received by the image sensor when illuminated with illumination light with the second spectrum and for the light received by the image sensor when illuminated with illumination light with the first spectrum.
  • With alternating illumination with more than two different spectra, the corresponding three or more different illumination intervals can be set according to the respective conditions. Instead of a fixed setting of the ratio of the durations of the intersections of the illumination intervals with the exposure intervals, this ratio or the illumination intervals which do not correspond to the exposure interval can be regulated on the basis of detected image brightnesses.
  • The present invention is implementable as a method or computer program with program code for performing or controlling one of the methods described herein when the computer program runs on a computer or a processor. Furthermore, the invention as a computer program product with on a machine-readable carrier (for example, a ROM, PROM, EPROM, EEPROM or Flash memory, a CD-ROM, DVD, HD-DVD, Blu-ray Disc, Floppy disk or hard disk) or firmware stored program code for performing one of said methods when the computer program product runs on a computer, computer or processor. Furthermore, the present invention can be used as a digital storage medium (for example ROM, PROM, EPROM, EEPROM or flash memory, CD-ROM, DVD, HD-DVD, Blu-ray Disc, floppy disk or hard disk) with electronically readable control signals, which may interact with a programmable computer or processor system to perform any of the described methods.
  • The present invention is further implementable as a configuration pattern for a configurable array of logic gates, wherein the configuration pattern is configured to form an array of logic gates configured or configured according to the configuration pattern for performing or controlling one of the methods described herein. The configurable arrangement of logic gates is or includes in particular a FPGA (Field Programmable Gate Array), a CPLD (Complex Programmable Logic Device) or another arrangement of SPLDs (Simple Programmable Logic Devices).
  • A lighting controller for controlling illumination of an object detected by an endoscope or an exoscope and a photosensitive image sensor, wherein a camera control determines the duration of an exposure interval within which photons falling on the image sensor affect an image signal generated by the image sensor comprises An exposure signal input for receiving an exposure signal indicative of the duration of the exposure interval, and a control signal output for providing a control signal for controlling illumination of the object, wherein the illumination controller is configured to generate the control signal in response to the exposure signal.
  • The exposure signal is in particular a shutter signal for the direct or indirect control of a shutter device of a camera or a signal derived from the shutter signal or generated by signal conversion or signal conditioning.
  • The illumination control is designed in particular for carrying out a method or for use in a method as described here.
  • The exposure signal input may include a bus interface for coupling the lighting control to a bus, wherein the lighting controller is configured to receive the exposure signal via the bus interface from a camera controller.
  • A camera control for a photosensitive image sensor used to control a The duration of an exposure interval within which photons falling on the image sensor affect an image signal generated by the image sensor comprises an exposure signal output for providing an exposure signal indicative of the duration of the exposure interval for illumination control.
  • The exposure signal is in particular a shutter signal for the direct or indirect control of a shutter device of a camera or a signal derived from the shutter signal or generated by signal conversion or signal conditioning.
  • The camera control is particularly designed to execute or control one of the methods described herein or to be used in any of the methods described herein.
  • The exposure signal output may be a bus interface for coupling the camera controller to a bus, the camera controller being configured to transmit the exposure signal to a lighting controller via the bus interface.
  • Brief description of the figures
  • Embodiments will be explained in more detail with reference to the accompanying figures. Show it:
  • 1 a schematic representation of an endoscopy system;
  • 2 a schematic representation of another endoscopy system;
  • 3 a schematic representation of another endoscopy system;
  • 4 a schematic representation of several signals;
  • 5 a further schematic representation of several signals;
  • 6 a schematic flow diagram of a method for controlling a lighting of an object.
  • Description of the embodiments
  • 1 shows a schematic representation of an endoscopy system 10 for viewing or optical detection of an object 12 , The endoscopy system 10 includes an endoscope 20 , At the proximal end 21 of the endoscope 20 are a clutch 22 for a light guide cable and a coupling 23 arranged for a camera. From the proximal end 21 extends a rigid or flexible shaft 24 to a distal end 25 of the endoscope 20 , At the distal end 25 has the endoscope 20 a light exit window 26 and a light entry window 27 on.
  • About the clutch 23 is the endoscope 20 with a camera 30 coupled. The camera 30 includes a photosensitive image sensor 31 and a lens 32 ,
  • A camera control 40 has a shutter signal output 41 on that with the camera 30 and in particular with the photosensitive image sensor 31 the camera 30 is coupled. Further, the camera control points 40 an exposure signal output 42 on.
  • A lighting control 50 includes an exposure signal input 51 and a control signal output 52 , The control signal output 52 the lighting control 50 is with a switching device 53 coupled for switching electrical power. The switching device 53 is with a light emitting diode 56 connected in series. A condenser lens 59 is arranged and adapted to the light emitting diode 56 on one end of a fiber optic cable 70 map. The lighting control 50 , the switching device 53 , the light emitting diode 56 , the condenser lens 59 and an electric power supply, which will not be discussed here, may be used in a light source device 60 be integrated.
  • The camera control 40 is above the exposure signal output 42 with a bus 80 coupled. The lighting control 50 is over her exposure signal input 51 by bus 80 coupled. Thus, the camera control 40 and the lighting control 50 via the exposure signal output 42 the camera control 40 , the bus 80 and the exposure signal input 51 the lighting control 50 coupled. Instead of a bus 80 a point-to-point connection can be provided. The bus 80 or the point-to-point connection is for transmission of electrical, optical or other signals at least in the direction of the camera control 40 for lighting control 50 or formed in both directions.
  • Deviating from the illustration in 1 and alternatively to this, the components of the endoscopy system 10 be partially or fully integrated. For example, the camera control 40 or at least the functionality of camera control described below 40 into the camera 30 be integrated. The camera 30 or the camera 30 and the camera control 40 can in the endoscope 20 be integrated, for example at its proximal end 21 , The lighting control 50 can with the switching device 53 , of the led 56 , the condenser lens 59 and a power supply in a light source device 60 be integrated like this in 1 is shown. Alternatively, in particular, the lighting control 50 and the light emitting diode 56 be formed as separate devices that are connected for example via a cable. Furthermore, the light emitting diode 56 or the light emitting diode 56 , the switching device 53 and the lighting control 50 in the endoscope 20 be integrated, in particular at its proximal end.
  • For endoscopic detection of the object 12 by means of the endoscopy system 10 generates the LED 56 Light, by means of the condensing lens 59 in the fiber optic cable 70 coupled and from this to the proximal end 21 of the endoscope 20 is transmitted. By means of an in 1 Illumination beam path, not shown, in particular by means of one or more optical waveguides, that of the light emitting diode 56 generated illumination light from the proximal end 21 of the endoscope 20 to its distal end 25 transfer. The illumination light occurs at the light exit window 26 from the endoscope 20 out and fall on the object 12 , The illumination light can be from the object 12 absorbed, reflected or scattered. Furthermore, the illumination light may be dependent on its spectral properties and the properties of the surface of the object 12 Cause fluorescence.
  • From the object 12 outgoing reflected or scattered illumination light or fluorescent light falls on the light entrance window 27 at the distal end 25 of the endoscope 20 , This light will have an in 1 not shown observation beam path from the distal end 25 of the endoscope 20 to its proximal end 21 and on to the camera 30 transfer. The observation beam path includes, for example, a rod lens optics or an ordered bundle of optical waveguides. A lens 32 comprising at least one lens, a curved mirror or other imaging device generates a real image on the photosensitive image sensor 31 the camera 30 ,
  • Within one of the camera control 40 controlled by a shutter signal exposure interval on the photosensitive image sensor 31 falling photons influence a light-sensitive image sensor 31 generated analog or digital image signal. The photosensitive image sensor 31 , the shutter signal and an in 1 Shutter device, not shown, on the photosensitive image sensor 31 cause photons that fall outside of an exposure interval on the photosensitive image sensor, not affect the image signal generated by this.
  • The shutting device comprises, for example, electronic circuits that generate charges in the photosensitive elements of the image sensor 31 suppressed by photons outside of an exposure interval. Alternatively, for example, charges generated outside of an exposure interval are discarded and not accumulated or integrated as in an exposure interval. Alternatively, at the beginning of an exposure interval, the shutter signal controls the discarding of the already present charges and, at the end of an exposure interval, the reading or conversion of generated and accumulated charges into analog or digital signals. Alternatively, the shutting device comprises, for example, a liquid crystal device or a mechanical shutter for the controlled interruption of the observation beam path.
  • That of the photosensitive image sensor 31 generated image signal becomes camera control 40 transferred and can be prepared by this and forwarded, for example, to a screen. The camera control 40 determines averaged over the entire captured image or one or more portions of the image brightness, wherein the averaging can take place weighted or unweighted. Instead of a single parameter, a plurality of parameters, for example for different image areas and / or different color channels, can be determined.
  • The determined image brightness is determined by the camera control 40 compared with one or more predetermined conditions, in particular with thresholds or setpoints. Depending on the result of this comparison or these comparisons, the camera control generates 40 a shutter signal for controlling the next exposure interval, in particular its duration and / or its beginning and its end. If the image brightness in the last captured image is too low, the next exposure interval will be set longer. If the brightness of the last captured image was too large, the next exposure interval will be set correspondingly shorter.
  • In the way outlined controls the camera control 40 the brightness of the captured image by means of the shutter signal generated by it and the shutter device on the photosensitive image sensor 31 or in the camera 30 , In this case, the brightness of the entire image can be controlled or influenced by means of a global shutter signal, which is the shutter device for the entire photosensitive image sensor 31 the camera 30 uniformly controls. Alternatively, the camera control 40 generate separate shutter signals for different areas of the image and / or for different color channels, so that the different areas and / or the different color channels have different exposure intervals. As a result, the dynamics or the ability of the camera to produce an optimal image signal under different conditions can be increased.
  • The camera control 40 sets at the exposure signal output 42 the shutter signal or other exposure signal generated by signal conditioning or signal conversion from the shutter signal. This exposure signal indicates at least the duration of the exposure interval, in particular its beginning and end. When the camera control 40 no global shutter signal, but produces different shutter signals for different image areas or color channels, provides the camera control 40 at the exposure signal output 42 For example, an exposure signal indicative of the duration of the longest exposure interval. In particular, the exposure signal indicates an exposure interval comprising all the exposure intervals of the individual image areas or color channels.
  • The camera control 40 at the exposure signal output 42 provided exposure signal is sent via the bus 80 to the exposure signal input 51 the lighting control 50 transfer. The lighting control 50 generated by the camera control 40 received exposure signal, a control signal 52 for the switching device 53 , That of the lighting control 50 The control signal generated may be that at the exposure signal input 51 be received exposure signal or be generated from this by amplification, inversion and / or other transformation. In addition to the exposure signal, further parameters can be included in the generation of the control signal, for example a desired or predetermined illumination spectrum and / or a predetermined minimum or maximum radiation power.
  • That of the lighting control 50 generated control signal controls the switching device 53 , The switching device 53 controls the power supply of the LED 56 , In particular, the switching device 53 formed for an alternative operation in a high-impedance off state and a low-impedance on state. The switching device 53 is by the exposure control 50 generated control signal, for example, at the beginning of an exposure interval in the low-impedance on-state and at the end of an exposure interval in the high-impedance off state offset. The light-emitting diode 56 is thus supplied with electrical power during the exposure interval and emits light by means of the condenser lens 59 , the fiber optic cable 70 and the already mentioned illumination beam path in the endoscope 20 on the object 12 is directed. In this example, outside the exposure interval, the light emitting diode becomes 56 not supplied with electrical power and the object 12 not lit. This reduces the average power requirement of the light-emitting diode 56 and thus the entire light source device 60 in the light source device 60 dissipated heat output and the thermal and photochemical load of the object 12 ,
  • Also within an exposure interval of the light emitting diode 56 recorded mean electric power and that of the light emitting diode 56 The average radiation power generated in the exposure interval can be determined by the switching device 53 to be influenced. This is done for example by means of pulse width modulation or by setting a corresponding resistance of the switching device 53 ,
  • As the light emitting diode 56 operated only within the exposure intervals or at least their power supply is interrupted between successive exposure intervals, the light emitting diode 56 be operated in the time intervals, in which it is supplied with electric power, with a current greater than the rated current of the light emitting diode 56 for DC continuous operation is without an invalid and the life of the light emitting diode 56 to produce a shortening, excessive average thermal load. This allows the light from the LED 56 generated radiation power and the object 12 illuminating radiation power can be increased within the exposure intervals. The exposure intervals can be shortened. This reduces the motion blur in the individual captured image, for example, with moving objects.
  • 2 shows a schematic representation of another endoscopy system 10 , This in 2 shown endoscopy system 10 different from the above based on the 1 shown inter alia in that a photosensitive image sensor 31 and a light emitting diode 56 for generating illumination light at the distal end 25 an endoscope 20 are arranged.
  • Specifically, the endoscopy system includes 10 an endoscope 20 with a proximal end 21 and a shaft 24 that extends from the proximal end 21 to a distal end 25 extends. At the distal end 25 of the endoscope 20 are proximal to a light exit window 26 the already mentioned LED 56 and proximal to a light entry window 27 the already mentioned photosensitive image sensor 31 arranged. Thus, those in the above based on the 1 as a separate device provided camera and at least a part of the in the example 1 also provided as a separate device light source device in the in 2 shown example in the endoscope 20 integrated.
  • The endoscope 20 is with a camera control 40 coupled. The camera control 40 Similar to the above with reference to the 1 Example shown a Shuttertersignalausgang 41 and an exposure signal output 42 on. The shutter signal output 41 is via an electrical or optical signal line with the photosensitive image sensor 31 at the distal end 25 of the endoscope 20 coupled.
  • The endoscope 20 is further provided with a power supply device 61 coupled, in particular via an electrical line for power supply of the light emitting diode 56 at the distal end 25 of the endoscope 20 , The power supply device 61 includes a lighting control 50 with an exposure signal input 51 for receiving an exposure signal and a control signal output 52 , The control signal output 52 the lighting control 50 is with a switching device 53 coupled. The switching device 53 has at least one low-impedance on-state and one high-impedance off-state to supply the light emitting diode 56 with electrical power on and off. Alternatively, the switching device 53 one or more other operating states having a discrete or continuous spectrum of resistance values.
  • The exposure signal output 42 the camera control 40 is over a bus 80 or via a point-to-point connection or any other signal path with the exposure signal input 51 the lighting control 50 coupled.
  • Deviating from the illustration in 2 can the camera control 40 and / or the power supply device 61 in the endoscope 20 , in particular in its proximal end 21 be integrated. Furthermore, different from the illustration in FIG 2 the camera control 40 and the power supply device 61 in a common, from the endoscope 20 be integrated separate device.
  • This in 2 shown endoscopy system 10 is designed to be similar to the one above based on the 1 operated endoscopy system to be operated. In particular, captures the camera control 40 the brightness of the photosensitive image sensor 31 captured image and controls depending on the detected brightness, the duration of the exposure interval for the subsequent detection of another image. The camera control 40 for controlling the shuttle on the photosensitive image sensor 31 Shutter signal generated or other exposure signal generated by conditioning or conversion from the shutter signal is transmitted via the bus 80 to the lighting control 50 transfer. The lighting control 50 generates, depending on the exposure signal, a control signal for controlling the switching device 53 and thus the power supply of the LED 56 , Variants, functionalities and advantages correspond to the above based on the 1 Shown.
  • 3 shows a schematic representation of another endoscopy system 10 for viewing an object 12 , This in 3 shown endoscopy system is similar to the above based on the 1 illustrated endoscopy system. Differences are mainly in the field of light source device 60 , The light source device 60 includes differently than the above based on the 1 illustrated example, two LEDs 56 . 57 , their power supply by means of two independent shutters 53 . 54 from the lighting control 50 independently controlled, in particular can be switched on and off. The light-emitting diodes 56 . 57 are designed to emit different illumination spectra.
  • By way of example, the first light-emitting diode comprises 56 a blue glowing pn-junction and a phosphorescent or fluorescent dye to produce an overall perceived as white by the human eye illumination spectrum. Alternatively, the light-emitting diode comprises 56 three (eg, RGB LED) or more pn junctions that emit light with different spectra to produce an overall illumination spectrum perceived by the human eye as white. The second LED 57 emits light, which is used to excite fluorescence in the object 12 is suitable, in particular blue or ultraviolet light.
  • The second LED 57 may comprise a photonic grating or combined with a photonic grating to emit a narrowband spectrum. The second LED 57 may also be formed as a diode laser. Instead of the second LED 57 another laser may be provided.
  • The lighting control 50 controls the switching devices 53 . 54 such that in a series of successive exposure intervals for generating one field or frame alternately the first light-emitting diode 56 or the second LED 57 Illuminating light is generated by the light emission window 26 on the object 12 falls. This can be done by means of the endoscopy system 10 alternately white light images and images in fluorescent light from the object 12 be generated. The pictures are processed. On a in 3 not shown monitor is then, for example, the most recent white light image of the object 12 wherein areas of increased fluorescence and / or Areas of reduced fluorescence indicative of pathological changes are marked.
  • The two LEDs 56 . 57 may alternatively be designed to generate illumination light with any other illumination spectra. Furthermore, more than two light-emitting diodes can be provided, whose power supply can be controlled independently or in groups independently of a corresponding number, alternatively over a smaller number, of switching devices.
  • Also in the case of the 3 illustrated endoscopy system 10 may differ from the illustration in 3 the photosensitive image sensor 31 and / or a part of the light-emitting diodes 56 . 57 or all light emitting diodes 56 . 57 at the distal end 25 of the endoscope 20 be arranged. Further above on the basis of 1 and 2 illustrated variants, functionalities and advantages are also on the endoscopy system 10 out 3 transferable.
  • 4 shows a schematic representation of signals, as in the above with reference to 1 to 3 shown endoscopy system can be generated and processed. The abscissa is assigned to the time t, the ordinate in each case the signal level in arbitrary units.
  • Signals S 1 and S 2 together represent an example of a shutter signal consisting of two individual signals. Alternatively, only the signal S 1 can be regarded as a shutter signal in the sense of the present description. The signals S 1 , S 2 are in particular by means of separate electrical or optical lines of the camera control 40 to the photosensitive image sensor 31 and / or to a shuttle device connected to the photosensitive image sensor 31 can be integrated. A falling edge in the first signal S 1 defines a beginning of an exposure interval E 1 , E 2 . A falling edge in the second signal S 2 defines one end of an exposure interval E 1 , E 2 . For example, the first signal S 1 controls a discharge of charges generated by photons on the photosensitive image sensor, and the second signal S 2 controls the conversion of charges thus generated and accumulated by photons into an analog or digital signal.
  • Among the signals S 1 , S 2 , an alternative shutter signal S is shown, which can be transmitted via a single electrical or optical line. A falling edge of the shutter signal S defines the beginning, a rising edge of the shutter signal S defines the end of an exposure interval.
  • Shutter signals S 1 , S 2 , S show control signals L 1 , L 2 . The example of two different control signals L 1 , L 2 refers in particular to the above with reference to 3 Example shown with two LEDs 56 . 57 , The control signal L 1 is for controlling the first switching device 53 for the first light-emitting diode 56 intended. The second control signal L 2 is for the control of the second switching device 54 for the second light-emitting diode 57 intended. The control signals L 1 , L 2 are designed to alternately either the first light emitting diode in a series of successive exposure intervals E 1 , E 2 56 or the second LED 57 to provide electrical power. This will make the object 12 for example alternately illuminated with white light and fluorescence excitation light. Deviating from the illustration in 4 For example, the exposure intervals E 1 , E 2 may have different lengths. This can be useful, for example, if the two light emitting diodes provide different radiation powers. In particular, when the second light-emitting diode (for example in the form of a laser diode) generates fluorescence excitation light, the second exposure interval E 2 is generally significantly longer than the first exposure interval E 1 . This is partly due to the fact that the fluorescence yield is generally much lower than the remission level with respect to white light.
  • In the time intervals C between two consecutive exposure intervals E 1 , E 2 , both light-emitting diodes are used 56 . 57 not supplied with electrical power. This reduces the power requirements of the light emitting diodes 56 . 57 generated waste heat and the thermal and photochemical load of the object 12 ,
  • 5 shows a further schematic representation of signals, as in the above with reference to 1 to 3 shown endoscopy system can be generated and processed. As in 4 the abscissa is the time t, the ordinate the signal level in arbitrary units.
  • In the 5 Signals shown refer to a situation in which at the same lighting and exposure times for illumination of the object 12 with light of the first light emitting diode 56 and for lighting the object 12 with light of the second LED 57 clearly different bright images are captured. For example, the light flux from the first light emitting diode 56 generated and in the illumination beam path of the endoscope 20 is coupled, larger or much larger than the light flux from the second LED 57 generated and in the illumination beam path of the endoscope 20 is coupled. Other reasons may be that the transmittance of the illumination beam path for light of the first light-emitting diode 56 is greater than the transmittance of the illumination beam path for light of the second led 57 ; that the remission degree of the object 12 when illuminated with light of the first light emitting diode 56 is greater than when illuminated with light of the second LED 57 ; that the transmittance of the observation beam path for when illuminated with light of the first light emitting diode 56 from the object 12 remitted light is greater than the transmittance of the observation beam path for when illuminated with light of the second light emitting diode 57 from the object 12 remitted light; that the sensitivity, in particular the quantum efficiency, of the photosensitive image sensor 31 for when lighting the object 12 with light of the first light emitting diode 56 received light from the image sensor is greater than the sensitivity of the image sensor 31 for when lighting the object 12 with light of the second LED 57 from the image sensor 31 received light.
  • For example, the first light emitting diode emit 56 White light or light with a spectrum perceived by the human eye as white and the second light emitting diode 57 Light that excites fluorescence in or on the object 12 is suitable, for example blue or ultraviolet light. As a rule, the fluorescence yield is lower or significantly lower than the remission degree of the object 12 when illuminated with white light.
  • Many simple conventional camera controls 40 are not designed to alternately control two different exposure times E 1 , E 2 for two different illumination situations in order to acquire successive images. Rather, many conventional camera controls are designed to produce a shutter signal in alternating lighting situations that approximately corresponds to an average intensity I m = (I 1 + I 2 ) / 2. In the above based on the 4 As an example, this has the consequence that both light-emitting diodes 56 . 57 approximately the same amount of time. The acquisition of successive images at the same length of exposure and illumination intervals E 1 , E 2 , but different light sources and spectra then has the consequence in the above cases that alternately over- and underexposed images are detected. For example, an overexposed white light image and an underexposed fluorescence image are alternately detected.
  • At the in 5 illustrated example illumination intervals B 1 , B 2 are controlled, which are at least partially different from the exposure intervals E 1 , E 2 . The from the camera control 40 controlled exposure intervals E 1 , E 2 are the same length. The second illumination interval B 2 , within which the second light-emitting diode 57 Light emitted to excite fluorescence corresponds to the second exposure interval E 2 . The first illumination interval B 1 is controlled by a factor F shorter than the second illumination interval B 2 (F = | B 1 | / | B 2 |), the first exposure interval E 1 and the second exposure interval E 2 , which is at least approximately the inverse ratio the image brightness in the above based on the 4 shown corresponds control with the same length of illumination. Where | B 1 | the duration of the first illumination interval and | B 2 | the duration of the second illumination interval.
  • For example, the factor F is controlled in a control loop by detecting and comparing the image brightnesses so that the image brightnesses are the same for both alternating illumination situations. Alternatively, the factor F is calculated, for example, as product F = J * K * L * M * N. There are
    J is the ratio of that of the second light emitting diode 57 generated and coupled into the illumination beam path radiation flux and that of the first light emitting diode 56 generated and coupled into the illumination beam path radiation flux;
    K is the ratio of the transmittance of the illumination beam path for light of the second light-emitting diode 57 and the transmittance of the illumination beam path for light of the first light emitting diode 56 ;
    L is the ratio of the remission degree of the object 12 when illuminated with light of the second LED 57 and the remission degree of the object 12 when illuminated with light of the first light emitting diode 56 ;
    M is the ratio of the transmittance of the observation beam path for when illuminated with light of the second light emitting diode 57 from the object 12 remitted light and the transmittance of the observation beam path for when illuminated with light of the first light emitting diode 56 from the object 12 remitted light;
    N is the ratio of the sensitivities, in particular the quantum yields, of the photosensitive image sensor 31 for when lighting the object 12 with light of the second LED 57 light received by the image sensor and when the object is illuminated 12 with light of the first light emitting diode 56 light received by the image sensor.
  • An extension to alternating illumination with the light of three or more different light-emitting diodes or other light sources, for example, to alternating illumination with red, blue, green and ultraviolet light is possible.
  • 6 shows a schematic flow diagram of a method for controlling a lighting of a medical object, which is detected by means of a photosensitive image sensor of a camera. The method is applicable to a camera control which controls the duration of an exposure interval within which photons incident on the image sensor affect an image signal generated by the image sensor. Although that The method is also applicable together with systems, devices and devices that are based on the above 1 to 4 DIFFERENT FIG 1 to 4 used to simplify the understanding. The method is particularly applicable to medical and non-medical endoscopy and exoscopy systems.
  • At a first step 101 a shutter signal S 1 , S 2 , S is detected by the camera control 40 is generated and indicates the duration of the exposure interval E 1 , E 2 . The shutter signal may comprise a plurality of individual signals S 1 , S 2 , which may be transmitted to the photosensitive image sensor and / or to a shuttle via various physical or logical transmission channels.
  • In a second step 102 the shutter signal is processed, in particular amplified, inverted or otherwise converted, in particular in an exposure signal. At a third step 103 is the processed signal, in particular the exposure signal, from the camera control 40 to a lighting control 50 transfer. This is done for example by means of a bus 80 , At a fourth step 104 a control signal L 1 , L 2 is generated from the processed and transmitted signal, in particular from the exposure signal. The control signal L 1 , L 2 is generated in particular by the lighting control and may comprise a plurality of individual signals L 1 , L 2 .
  • At a fifth step 105 becomes a first light emitting diode 56 switched on or connected to a power supply. At a sixth step 106 becomes the first light emitting diode 56 switched off or disconnected from the power supply. The fifth step 105 and the sixth step 106 in particular by means of a first switching device 53 executed by the lighting control 50 is controlled by the control signal L 1 .
  • At a seventh step 107 becomes a second LED 57 switched on or connected to a power supply. At an eighth step 108 becomes the second LED 57 switched off or disconnected from the power supply. The seventh step 107 and the eighth step 108 in particular by means of a switching device 54 controlled by the lighting control 50 is controlled by the control signal L 2 .
  • The fifth step 105 and the seventh step 107 are carried out in particular at the beginning of an exposure interval E 1 , E 2 . The sixth step 106 and the eighth step 108 are carried out in particular at the end of an exposure interval E 1 , E 2 . The fifth step 105 and the sixth step 106 are executed at the beginning and at the end of the same exposure interval. The seventh step 107 and the eighth step 108 are executed at the beginning and at the end of the same exposure interval. The fifth step 105 and the sixth step 106 on the one hand and the seventh step 107 and the eighth step 108 On the other hand, at the beginning or at the end of two different exposure intervals, in particular two immediately consecutive exposure intervals, can be performed. Alternatively, the fifth step 105 and the sixth step 106 on the one hand and the seventh step 107 and the eighth step 108 on the other hand, at the beginning or at the end of the same exposure interval.
  • The fifth step 105 and the seventh step 107 may alternatively be performed before or after the beginning of the respective exposure interval. The sixth step 106 and the eighth step 108 may alternatively be performed before or after the end of the respective exposure interval. Between the fifth step 105 and the sixth step 106 or between the seventh step 107 and the eighth step 108 can the power of the first light emitting diode 56 or the second light emitting diode 57 be adjusted by means of an adjustable series resistor or by means of pulse width modulation.
  • In the 6 illustrated steps from the first step 101 until and including the eighth step 108 can be repeated for each exposure interval controlled by the camera control. This changes the camera control 40 the shutter signal after each exposure interval so that deviations of the brightness of the last captured image from a target value or more complex specifications in the subsequently acquired image are corrected as far as possible. If two or more different illumination spectra are generated in a series of successive exposure intervals E 1 , E 2 by means of two or more light-emitting diodes, it is advantageous if the camera control distinguishes between the different exposure intervals and the duration of the exposure intervals for the different illumination spectra and the different light-emitting diodes independently from each other.
  • LIST OF REFERENCE NUMBERS
  • 10
    endoscopy system
    12
    object
    20
    endoscope
    21
    proximal end of the endoscope 20
    22
    Coupling for optical cable 60
    23
    Clutch for camera 30
    24
    Shank of the endoscope 20
    25
    distal end of the endoscope 20
    26
    Light emission window at the distal end 25 of the endoscope 20
    27
    Light entry window at the distal end 25 of the endoscope 20
    30
    camera
    31
    Photosensitive image sensor of the camera 30
    32
    Lens of the camera 30
    40
    camera control
    41
    Shutter signal output of the camera control 40
    42
    Exposure signal output of the camera control 40
    50
    lighting control
    51
    Exposure signal input of the lighting control 50
    52
    Control signal output of the lighting control 50
    53
    switching device
    54
    switching device
    56
    led
    57
    led
    59
    converging lens
    60
    Light source means
    61
    Power supply means
    70
    optical cable
    80
    bus
    101
    first step
    102
    second step
    103
    Third step
    104
    fourth step
    105
    fifth step
    106
    sixth step
    107
    seventh step
    108
    eighth step
    S 1 , S 2
    shutter signal
    S
    shutter signal
    L 1 , L 2
    control signal
    E 1 , E 2
    exposure interval
    B 1 , B 2
    lighting interval
    C
    Time interval between two consecutive exposure intervals E 1 , E 2

Claims (13)

  1. Method for controlling a lighting of an object ( 12 ), which by means of an endoscope ( 20 ) or an exoscope and by means of a photosensitive image sensor ( 31 ), whereby a camera control ( 40 ) determines the duration of an exposure interval (E 1 , E 2 ) within which the image sensor ( 31 ) falling photons from the image sensor ( 31 ), with the following steps: detecting ( 101 ) a shutter signal determined by the camera controller, indicating the duration of the exposure interval (E 1 , E 2 ); Taxes ( 104 . 105 . 106 . 107 . 108 ) illuminating the object ( 12 ) in response to the shutter signal (S 1 , S 2 , S).
  2. Method according to the preceding claim, in which the controlling of the lighting is a control ( 105 . 106 . 107 . 108 ) a light source device ( 56 . 57 ; 60 ) for generating illumination light for illuminating the object ( 12 ).
  3. Method according to the preceding claim, in which the shutter signal (S 1 , S 2 , S) indicates a beginning and an end of the exposure interval (E 1 , E 2 ), and in which the control of the lighting is interrupted ( 106 . 108 ) one of the light source device ( 56 . 57 ; 60 ) between two consecutive exposure intervals (E 1 , E 2 ).
  4. Method according to the preceding claim, in which the light source device ( 56 . 57 ; 60 ) is controlled to provide illumination light only within the exposure interval (E 1 , E 2 ).
  5. A method according to the preceding claim, wherein controlling the lighting is a power-on ( 105 . 107 ) of a light source ( 56 . 57 ) of the light source device at the beginning of the exposure interval (E 1 , E 2 ) and a switch-off ( 106 . 108 ) of the light source ( 56 . 57 ) at the end of the exposure interval (E 1 , E 2 ).
  6. Method according to one of the preceding claims, in which the controlling of lighting ( 104 . 105 . 106 . 107 . 108 ) controlling one or more inorganic or organic light-emitting diodes ( 56 . 57 ) or other semiconductor light sources.
  7. Method according to the preceding claim, in which the light-emitting diode ( 56 . 57 ) is operated with a current which is greater than the rated current of the light emitting diode ( 56 . 57 ).
  8. Method according to one of the preceding claims, in which the lighting is controlled in such a way that the object ( 12 ) is illuminated in successive exposure intervals (E 1 , E 2 ) with illumination light having different spectra.
  9. Method according to the preceding claim, in which in a first exposure interval (E 1 ) by means of one or more first light-emitting diodes ( 56 ) Illumination light is generated with a perceived by the human eye as white spectrum, and in which in a second exposure interval (E 2 ) by means of one or more light-emitting diodes ( 57 ) or diode lasers illuminating light having an excitation spectrum for exciting fluorescence is generated.
  10. Lighting control ( 50 ) for controlling a lighting of an object ( 12 ), which by means of an endoscope ( 20 ) or an exoscope and by means of a photosensitive image sensor ( 31 ), whereby a camera control ( 40 ) determines the duration of an exposure interval (E 1 , E 2 ) within which the image sensor ( 31 ) falling photons from the image sensor ( 31 ), with: an exposure signal input ( 51 ) for receiving an exposure signal (S 1 , S 2 , S) indicating the duration of the exposure interval (E 1 , E 2 ); a control signal output ( 52 ) for providing a control signal (L 1 , L 2 ) for controlling a lighting of the object ( 12 ), whereby the lighting control ( 50 ) is formed to generate the control signal (L 1 , L 2 ) in response to the exposure signal (S 1 , S 2 , S).
  11. Camera control ( 40 ) for a photosensitive image sensor ( 31 ) for controlling a duration of an exposure interval (E 1 , E 2 ) within which the image sensor ( 31 ) falling photons from the image sensor ( 31 ), with: an exposure signal output ( 42 ) for providing an exposure signal (S 1 , S 2 , S) indicating the duration of the exposure interval (E 1 , E 2 ) for a lighting control ( 50 ).
  12. A computer program with program code for carrying out or controlling a method according to any one of claims 1 to 9, when the computer program runs on a computer or a processor.
  13. Configuration pattern for a configurable arrangement of logic gates, wherein the configuration pattern is formed so that an according to the configuration pattern configured arrangement of logic gates for performing or controlling a method according to one of claims 1 to 9 is formed.
DE201110001200 2010-03-10 2011-03-10 Method for controlling illumination of medical object, involves detecting shutter signals determined from controller, and controlling illumination of object based on function of signals, where signals indicate durations of exposure interval Pending DE102011001200A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011086325A1 (en) 2011-11-15 2013-05-16 Karl Storz Gmbh & Co. Kg Illumination optics, observation device and method for generating an illumination light beam
DE102011087357A1 (en) * 2011-11-29 2013-05-29 Karl Storz Gmbh & Co. Kg Method for updating preoperatively recorded three-dimensional image data of body by preoperatively recorded three-dimensional image data updating device, involves correcting three-dimensional image data using position data of endoscope
DE102011122602A1 (en) * 2011-12-30 2013-07-04 Karl Storz Gmbh & Co. Kg Apparatus and method for endoscopic fluorescence detection
US10122897B2 (en) 2013-09-24 2018-11-06 Karl Storz Se & Co. Kg Device for recording an image of an object field on a human or animal body

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011086325A1 (en) 2011-11-15 2013-05-16 Karl Storz Gmbh & Co. Kg Illumination optics, observation device and method for generating an illumination light beam
US9717400B2 (en) 2011-11-15 2017-08-01 Karl Storz Gmbh & Co. Kg Illuminating lens, observation device and method for producing an illuminating light bundle
DE102011087357A1 (en) * 2011-11-29 2013-05-29 Karl Storz Gmbh & Co. Kg Method for updating preoperatively recorded three-dimensional image data of body by preoperatively recorded three-dimensional image data updating device, involves correcting three-dimensional image data using position data of endoscope
DE102011122602A1 (en) * 2011-12-30 2013-07-04 Karl Storz Gmbh & Co. Kg Apparatus and method for endoscopic fluorescence detection
DE102011122602A9 (en) * 2011-12-30 2013-08-29 Karl Storz Gmbh & Co. Kg Apparatus and method for endoscopic fluorescence detection
DE102011122602A8 (en) * 2011-12-30 2014-01-23 Karl Storz Gmbh & Co. Kg Apparatus and method for endoscopic fluorescence detection
US10122897B2 (en) 2013-09-24 2018-11-06 Karl Storz Se & Co. Kg Device for recording an image of an object field on a human or animal body

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