CN102379675B

CN102379675B - Electronic endoscope system, shooting control method thereof and processor device

Info

Publication number: CN102379675B
Application number: CN201110248326.2A
Authority: CN
Inventors: 山口博司
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2010-08-30
Filing date: 2011-08-26
Publication date: 2015-07-15
Anticipated expiration: 2031-08-26
Also published as: JP5467972B2; CN102379675A; JP2012045266A

Abstract

The invention provides an electronic endoscope system, a shooting control method thereof and a processor device. In the close-range observation mode, a first blue narrow-band light (Bn1) and a first green narrow-band light (Gn1) are irradiated into a body cavity, while shooting is performed via a shooting element. The amount of shooting signal detection exposure is read out based on the shooting element. When the amount of exposure does not reach a certain value, the close-range observation mode is switched to a long-range observation mode. In the long-range observation mode, a second blue narrow-band light (Bn2) which increases the half-value width of the first blue narrow-band light (Bn1) and a second green narrow-band light (Gn2) which increases the half-value width of the first green narrow-band light (Gn1) are irradiated into the body cavity, while shooting is performed via the shooting element. Due to the increase in the half-value widths of the second blue narrow-band light (Bn2) and the second green narrow-band light (Gn2), the defect of insufficient lights during the long-range observation is therefore eliminated.

Description

Electronic endoscope system and camera shooting control method thereof and processor device

Technical field

The present invention relates to the electronic endoscope system and camera shooting control method thereof and processor device with the special smooth overview function being highlighted superficial blood vessel.

Bei Jing Ji Intraoperative

At medical field in recent years, the Treatment and diagnosis of fujinon electronic video endoscope is used to popularize.Fujinon electronic video endoscope possesses the endoceliac elongated insertion section of inserting examinee, and is built-in with the imaging apparatuss such as CCD in the leading section of this insertion section.In addition, fujinon electronic video endoscope is connected with light supply apparatus and processor device.Illumination light from light supply apparatus is irradiated from the illuminating window of the leading section being located at fujinon electronic video endoscope to endoceliac look-out station.Reflected light from look-out station is incident to CCD by the camera window being located at the leading section of fujinon electronic video endoscope.The image taken by this CCD is admitted to processor device, and processed circuit shows at monitor after implementing various image procossing.Therefore, by using fujinon electronic video endoscope, can the endoceliac image of real-time confirmation examinee, therefore, Treatment and diagnosis can be carried out aptly.

Light supply apparatus uses white light source, the such as xenon lamp that can send from blue band domain (blue wavelength domain) to the wide band light of the white of red band domain (red wavelength territory).By using the wide band light of white as illumination light, can comprehensive observing irradiated body tissue (objective tissue).Can roughly observe irradiated body tissue from the photographed images obtained when irradiating wide band light, but the irradiated body tissues such as the sag and swell of capillary vessel, pit pattern (gland outlet structure), depression or protuberance and so on are difficult to observe clearly.

As known, by wavelength being limited in for this irradiated body irradiated tissue the narrow-band-domain light of specific band domain, capillary vessel etc. can be observed emphatically clearly.On the other hand, due to the half breadth constriction of the light to irradiated body irradiated tissue, so the light quantity of illumination light reduces.Consequently, endoceliac illumination is insufficient, can not carry out good shooting.

In Japanese Patent No. 4009626 publication, the image pickup signal obtained is implemented to the image procossing compensated for deficiency in light quantity when irradiating narrow-band-domain light.Thus, though when narrow-band-domain light irradiation and when making dark in body cavity, the image quality of the reflection shown by monitor also can not reduce.

But as known, even if when irradiating narrow-band-domain light, when making forward end section of endoscope observe close to irradiated body tissue, so-called close shot is when observing, the light quantity of narrow-band-domain light also can not deficiency, fully can emphasize superficial blood vessel etc.In contrast, make endoscope distal end portion to carry out away from irradiated body tissue distant view observe time, so-called distant view observe time, due to the deficiency in light quantity of narrow-band-domain light, so sometimes fully superficial blood vessel etc. can not be emphasized.

For this opinion, do not record or hint in Japanese Patent No. 4009626 publication, therefore, no matter distant view is observed or arbitrary situation that close shot is observed, and all image pickup signal is carried out to the image procossing compensated for deficiency in light quantity.Therefore, when the distant view becoming deficiency in light quantity is observed, the image procossing for deficiency in light quantity compensation recorded in Japanese Patent No. 4009626 publication is useful.But when close shot is observed, be more fully highlighted superficial blood vessel etc., it is brighter, therefore, when carrying out the image procossing compensated for deficiency in light quantity, the reflection on monitor is too bright, and the anxiety being difficult on the contrary carry out observing exists.

Summary of the invention

The object of the invention is to, though when limit irradiate special plain edge carry out distant view observation, also can obtain enough bright reflection.

For achieving the above object, other object, the present invention possesses light irradiation device, imaging apparatus, observation state decision maker, video camera controller.Multiple narrow-band-domain light is optionally irradiated in body cavity by described light irradiation device, and comprises in described multiple narrow-band-domain light: the first blue narrow-band-domain light being restricted to specific band domain in blue band domain, the first green narrow-band-domain light being restricted to specific band domain in green band domain, the second blue narrow-band-domain light expanded with certain limit by the half breadth of described first blue narrow-band-domain light and at least one party of the second green narrow-band-domain light expanded with certain limit by the half breadth of described first green narrow-band-domain light.Described imaging apparatus is configured in the endoscope distal end portion inserted in body cavity, and takes described endoceliac irradiated body tissue and produce image pickup signal.Whether described observation state decision maker determines whether to have carried out shooting under the distance of described endoscope distal end portion and described irradiated body tissue is near state and close shot observation state based on described image pickup signal or takes under the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state.Described video camera controller controls described imaging apparatus, thus, when being judged to be described close shot observation state, takes the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described first green narrow-band-domain light; Described video camera controller controls described imaging apparatus, thus, when being judged to be described distant view observation state, the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described second green narrow-band-domain light, described second blue narrow-band-domain light and described first green narrow-band-domain light or described second blue narrow-band-domain light and described second green narrow-band-domain light is taken.

Preferably, described light irradiation device possesses: blue-light source, and it optionally produces described first blue narrow-band-domain light and described second blue narrow-band-domain light; And green light source, it optionally produces described first green narrow-band-domain light and described second green narrow-band-domain light.In these blue-light sources or described green light source, described half breadth scalable.Preferably, according to the regulated quantity of described half breadth, the signal processing of the view data generating monitor display from described shooting signal is changed.

Preferably, described blue-light source or described green light source are certain mode according to the ratio of the brightness ratio Lb/Lg under described close shot observation state and the brightness ratio Lbr/Lgt when described distant view is observed, and regulate the half breadth of described second blue narrow-band-domain light or described second green narrow-band-domain light.As follows at this each symbol, Lb: take by described imaging apparatus the first blue image pickup signal that described irradiated body tissue obtains under described close shot observation state in the irradiation of described first blue narrow-band-domain light.Lg: take by described imaging apparatus the first green image pickup signal that described irradiated body tissue obtains under described close shot observation state in the irradiation of described first green narrow-band-domain light.Lb ': take by described imaging apparatus the second blue image pickup signal that described irradiated body tissue obtains under described distant view observation state in the irradiation of described second blue narrow-band-domain light.Lg ': take by described imaging apparatus the second green image pickup signal that described irradiated body tissue obtains under described distant view observation state in the irradiation of described second green narrow-band-domain light.

Described light irradiation device comprises: send the wide band light source of the wide band light from blue band domain to red band domain and the rotary filter for taking out specific narrow-band-domain light from described wide band light.This rotary filter have make described first blue narrow-band-domain light through the first blue narrow-band-domain light through light filter, make described second blue narrow-band-domain light through the second blue narrow-band-domain light through light filter, make described first green narrow-band-domain light through the first green narrow-band-domain light through light filter and described second green narrow-band-domain light.

Preferably, described observation state decision maker detects light exposure according to described image pickup signal, when the light exposure detected is more than certain value, is judged to be described close shot observation state; When not enough certain value, be judged to be described distant view observation state.

In other embodiment of electronic endoscope system, possess imaging apparatus, observation state decision maker, light irradiation device.Described imaging apparatus is configured in the endoscope distal end portion inserted in described body cavity, and takes endoceliac irradiated body tissue and produce image pickup signal.Whether observation state decision maker, based on described image pickup signal, determines whether to have carried out shooting under the distance of described endoscope distal end portion and described irradiated body tissue is near state and close shot observation state or takes under the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state.Multiple narrow-band-domain light is optionally irradiated in body cavity by described light irradiation device.In described light irradiation device, when being judged to be described close shot observation state, the first blue narrow-band-domain light being restricted to specific band domain in blue band domain and the first green narrow-band-domain light of being restricted to specific band domain in green band domain are irradiated; When being judged to be described distant view observation state, the second blue narrow-band-domain light expanded with certain limit by the half breadth of described first blue narrow-band-domain light and the second green narrow-band-domain light expanded with certain limit by the half breadth of described first green narrow-band-domain light, described first blue narrow-band-domain light and described second green narrow-band-domain light or described second blue narrow-band-domain light and described first green narrow-band-domain light are irradiated.

In other embodiment again of electronic endoscope system, possess light irradiation device, observation state decision maker, imaging apparatus.Multiple narrow-band-domain light is optionally irradiated in body cavity by described light irradiation device.Comprise in described multiple narrow-band-domain light: the first blue narrow-band-domain light being restricted to specific band domain in blue band domain, the first green narrow-band-domain light being restricted to specific band domain in green band domain, the second blue narrow-band-domain light that the half breadth of described first blue narrow-band-domain light is expanded with certain limit and at least one party of the second green narrow-band-domain light that the half breadth of described first green narrow-band-domain light is expanded with certain limit.Whether described observation state decision maker determines whether the distance inserting described endoceliac endoscope distal end portion and described endoceliac irradiated body tissue is near state and close shot observation state or be the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state.Described imaging apparatus is configured in described endoscope distal end portion.When being judged to be described close shot observation state, by this imaging apparatus, the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described first green narrow-band-domain light is taken; When being judged to be described distant view observation state, by this imaging apparatus, the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described second green narrow-band-domain light, described second blue narrow-band-domain light and described first green narrow-band-domain light or described second blue narrow-band-domain light and described second green narrow-band-domain light is taken.

Processor device of the present invention carries out image procossing to the image pickup signal from endoscope.This endoscope has following functions, that is, the first blue narrow-band-domain light of specific band domain, the first green narrow-band-domain light being restricted to specific band domain in green band domain, the second blue narrow-band-domain light expanded with certain limit by the half breadth of described first blue narrow-band-domain light will be restricted to and at least one party of the second green narrow-band-domain light that expanded with certain limit by the half breadth of described first green narrow-band-domain light is optionally irradiated to endoceliac function in blue band domain; With the function being produced described image pickup signal by the imaging apparatus shooting irradiated body tissue configured in the endoscope distal end portion inserted in described body cavity.Described processor apparatus possesses observation state decision maker and video camera controller.Whether described observation state decision maker determines whether to have carried out shooting under the distance of described endoscope distal end portion and described irradiated body tissue is near state and close shot observation state based on described image pickup signal or takes under the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state.Described video camera controller controls described imaging apparatus, thus, when being judged to be described close shot observation state, takes the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described first green narrow-band-domain light; Described video camera controller controls described imaging apparatus, thus, when being judged to be described distant view observation state, the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described second green narrow-band-domain light, described second blue narrow-band-domain light and described first green narrow-band-domain light or described second blue narrow-band-domain light and described second green narrow-band-domain light is taken.

Camera shooting control method of the present invention is applicable to the electronic endoscope system possessing endoscope and processor device.Described endoscope has the imaging apparatus configured in the endoscope distal end portion inserted in body cavity, and takes irradiated body tissue by this imaging apparatus and produce image pickup signal.Described processor device carries out image procossing to the image pickup signal from described endoscope.Described camera shooting control method comprises the light irradiation step under determination step, close shot observation state or the light irradiation step under distant view observation state, shooting step.In described determination step, based on described image pickup signal, determine whether to have carried out shooting under the distance of endoscope distal end portion and described irradiated body tissue is near state and close shot observation state or whether take under the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state.In light irradiation step under described close shot observation state, optionally irradiated in described body cavity by the first blue narrow-band-domain light of being restricted to specific band domain in blue band domain, the first green narrow-band-domain light of being restricted to specific band domain in green band domain; In light irradiation step under distant view observation state, use arbitrary group in the second blue narrow-band-domain light and the second green narrow-band-domain light expanded with certain limit by the half breadth of described first green narrow-band-domain light, described first blue narrow-band-domain light and described second green narrow-band-domain light or described second blue narrow-band-domain light and described first green narrow-band-domain light expanded with certain limit by the half breadth of described first blue narrow-band-domain light, optionally irradiate in described body cavity by the narrow-band-domain light of 2 kinds.In described shooting step, in described endoceliac illumination, take described irradiated body tissue by described capturing element.

According to the present invention, under close shot observation state, use the first blue narrow-band-domain light and the first green narrow-band-domain light; Under distant view observation state, the the second blue narrow-band-domain replacing the first blue narrow-band-domain light to use being expanded with certain limit by half breadth or replacement the first green narrow-band-domain light use the second green narrow-band-domain light expanded with certain limit by half breadth, therefore, even if be distant view observation state, enough bright reflection also can be obtained.

Accompanying drawing explanation

Fig. 1 is the skeleton diagram of the electronic endoscope system of first embodiment of the invention;

Fig. 2 is the block diagram of electronic endoscope system;

Fig. 3 is the skeleton diagram of rotary filter;

Fig. 4 represents that blue light that the rotary filter of Fig. 3 uses is through light filter, green through light filter, the red chart through the spectral transmission of light filter;

Fig. 5 A represents that the first blue narrow-band-domain light that the rotary filter of Fig. 3 uses is through light filter and the first green narrow-band-domain light chart through the spectral transmission of light filter;

Fig. 5 B represents that the second blue narrow-band-domain light that the rotary filter of Fig. 3 uses is through light filter and the second green narrow-band-domain light chart through the spectral transmission of light filter;

Fig. 6 A is the chart of the absorptance of the light represented in blood vessel;

Fig. 6 B is the chart of the scattering of light coefficient represented in raw soma;

Fig. 7 A is the key diagram that the shooting of the CCD represented when normal light is observed controls;

Fig. 7 B is the key diagram that the shooting of the CCD representing when special light is observed (close shot) controls;

Fig. 7 C is the key diagram that the shooting of the CCD representing when special light is observed (distant view) controls;

Fig. 8 is the image graph of (close shot) special light image shown by monitor when special light is observed;

Fig. 9 is the image graph of (distant view) special light image shown by monitor when special light is observed;

Figure 10 is the flow chart of the effect representing the first embodiment;

Figure 11 is the block diagram of the electronic endoscope system of second embodiment of the invention;

Figure 12 is the skeleton diagram of normal light rotary filter;

Figure 13 is the skeleton diagram of special light rotary filter;

Figure 14 A is the key diagram that the shooting of the CCD represented when normal light is observed controls;

Figure 14 B is the key diagram that the shooting of the CCD representing when special light is observed (close shot) controls;

Figure 14 C is the key diagram that the shooting of the CCD representing when special light is observed (distant view) controls;

Figure 15 is the block diagram of the electronic endoscope system of third embodiment of the invention;

Figure 16 represents that the half breadth of the second blue narrow-band-domain light Bn2 and the second green narrow-band-domain light Gn2 can carry out the key diagram regulated in certain limit;

Figure 17 A is the key diagram that the shooting of the CCD represented when normal light is observed controls;

Figure 17 B is the key diagram that the shooting of the CCD representing when special light is observed (close shot) controls;

Figure 17 C is the key diagram that the shooting of the CCD representing when special light is observed (distant view) controls;

Figure 18 represents to carry out distant view by the illumination light of the half breadth only broadening green narrow-band-domain light

The key diagram that shooting when observing controls.

Detailed description of the invention

As shown in Figure 1, the electronic endoscope system 10 of first embodiment of the invention possesses: the endoceliac fujinon electronic video endoscope 11 of shooting examinee; The processor device 12 of endoceliac image is generated based on the signal obtained by shooting; The light supply apparatus 13 of supply to the illumination light of irradiating in body cavity; Show the monitor 14 of endoceliac image.

Above-mentioned electronic endoscope system 10 has normal light image model and these two observing patterns of special light image pattern.In normal light image model, by by wide band light such as white lights to throwing light in body cavity, obtain the natural image of irradiated body tissue, comprehensive observation can be carried out to irradiated body tissue.In special light image pattern, by being thrown light on in body cavity by narrow-band-domain light, obtain the image being highlighted superficial blood vessel etc.In this special light image pattern, under there is the close shot observing pattern of to carry out observing under the leading section 16a of fujinon electronic video endoscope 11 and the close close shot state of the distance of irradiated body tissue and the distant view state in the distance with irradiated body tissue, carry out the distant view observing pattern of observing.

Fujinon electronic video endoscope 11 possesses: insert endoceliac flexual insertion section 16, be located at the operating portion 17 of the cardinal extremity part of insertion section 16, general flexible cord 18 for being connected with processor device 12 and light supply apparatus 13 by operating portion 17.Be formed multiple bending block (Horse in the front of insertion section 16) bending section 19 that links.Bending section 19 carries out flexure operation by operating the dihedral knob 21 of operating portion in direction up and down.Be connected with leading section 16a in the front end of bending section 19, by the flexure operation of bending section 19, and make leading section 16a towards desired direction.In this leading section, 16a is accommodated with well-known camera system, illuminator etc.

On general flexible cord 18, at processor device 12 and light supply apparatus 13 side, adapter 24 is installed.Adapter 24 is for having the compound adapter of connector for communication and light source adapter.Via this adapter 24, fujinon electronic video endoscope 11 is connected freely with processor device 12 and light supply apparatus 13 dismounting.

As shown in Figure 2, light supply apparatus 13 possesses wide band light source 30, rotary filter 31, light filter switching part 32.As wide band light source 30, use xenon lamp, White LED, micro white light source etc., produce the wide band light BB from blue band domain to red band domain (about 470 ~ 700nm).Wide band light source 30 continues to light in the use of fujinon electronic video endoscope 11.The wide band light BB sent from wide band light source 30 incides collecting lens 34 through rotary filter 31.Incident to photoconduction 35 by the wide band light BB of collecting lens 34 optically focused.

Rotary filter 31 is pressed certain speed by motor 36 and is rotated centered by rotating shaft 31a.This rotary filter 31 possesses the first filter areas 38 and the second filter areas 39.In this example, the first filter areas 38 to the second filter areas 39 is arranged more in the inner part.First filter areas 38 make in the wide band light BB from wide band light source 30 for illumination light during normal light image model through.Second filter areas 39 make in wide band light BB for illumination light during special light image pattern through.Light filter switching part 32 is installed on the rotating shaft 31a of rotary filter 31, according to making the second filter areas 39 be positioned at mode in the light path of wide band light source 30 when making the first filter areas 38 be positioned in the light path of wide band light source 30, in special light image pattern when normal light image model, rotary filter 31 is moved in direction, footpath.

Fujinon electronic video endoscope 11 possesses photoconduction 35, CCD44, analog processing circuit (AFE:Analog FrontEnd) 45, imaging control part 46.Photoconduction 35 is heavy caliber optical fiber, fibre bundle etc., incidence end is inserted light supply apparatus 13, by ejecting end and irradiation lens 48 opposite being located at leading section 16a.From the illumination light of light supply apparatus 13 by after photoconduction 43 leaded light, penetrate to irradiation lens 48.Incide the illumination light of irradiating lens 48, by being installed on the illuminating window 49 of the end face of leading section 16a to body cavity internal radiation.At the reflected light of body cavity internal reflection by being installed on the observation window 50 of the end face of leading section 16a, incide collecting lens 51.

In this embodiment, use CCD44 as imaging apparatus.This CCD is the black-white CCD of the spectral sensitivity with regulation, and the reflected light that have passed collecting lens 51 is received by imaging surface 44a.Have multiple well-known pixel in imaging surface 44a two-dimensional arrangement, the reflected light of reception is carried out opto-electronic conversion by each pixel, and accumulates the signal charge produced.

Imaging control part 46 is connected with the controller 59 in processor device 12, under the control of controller 59, send drive singal to CCD44.CCD44 is driven based on drive singal, is read by the signal charge that each pixel is accumulated by time series, it can be used as the image pickup signal of the frame rate of regulation to be sent to AFE45.

As everyone knows, above-mentioned AFE45 is made up of correlated double sample circuit (CDS), automatic gain control circuit (AGC) and analog/digital converter (A/D) (all not shown).CDS implements correlated double sampling processing to the image pickup signal from CCD44, the noise contribution in removing image pickup signal.Image pickup signal from CDS amplifies in the mode making image pickup signal and converge in desired dynamic range by AGC.Image pickup signal from AGC is converted to digital form by A/D, and delivers to processor device 12 as the image pickup signal of specified bit number.

Processor device 12 possesses digital signal processing section (DSP:Digital Signal Processor) 55, frame memory 56, observation state detection unit 57, display control circuit 58, controller 59.Controller 59 pairs of each several parts control.DSP55 carries out the signal processing such as blank level adjustment, tone process, gray proces, definition process to the image pickup signal of the AFE45 from fujinon electronic video endoscope.In addition, frame memory 56, observation state detection unit 57, display control circuit 58, due to relevant to the kind of illumination light, are therefore described in detail after rotary filter 31.

As shown in Figure 3, in the first filter areas 38, be provided with in the circumferential direction in order: make the illumination light of blue band domain in wide band light BB (B light) through blue light through light filter 40, make the illumination light (G light) of wide band light BB Green band domain through green light through light filter 41, make the illumination light (R light) of red band domain in wide band light BB through red light through light filter 42.Therefore, by the rotation of rotary filter 31, penetrate B light, G light, R light successively from rotary filter 31.The B light penetrated successively from rotary filter 31, G light, R light are referred to as face order light.

At this, as shown in Figure 4, blue light has the spectral transmission shown in curve B through light filter 40, and green light has the spectral transmission shown in curve G through light filter 41, and red light has the spectral transmission shown in curve R through light filter 42.In addition, the long wavelength side of curve B and the short wavelength side of curve G overlap a part of, and in addition, the long wavelength side of curve G and the short wavelength side of curve R overlap a part of, therefore, in the coloured light selected, mix adjacent coloured light a little.

In the second filter areas 39, be provided with in the circumferential direction in order: make in wide band light BB for the first blue narrow-band-domain light Bn1 during close shot observing pattern through the first blue narrow-band-domain light through light filter 65, make in wide band light BB for the second blue narrow-band-domain light Bn2 during distant view observing pattern through the second blue narrow-band-domain light through light filter 66, make in wide band light BB for the first green narrow-band-domain light Gn1 during close shot observing pattern through the first green narrow-band-domain light through light filter 67, make in wide band light BB for the second green narrow-band-domain light Gn2 during distant view observing pattern through the second green narrow-band-domain light through light filter 68.

First blue narrow-band-domain light has the distribution as shown in the curve B n1 of Fig. 5 A through the spectral transmission of light filter 65, therefore, to the first blue narrow-band-domain light Bn1 of body cavity internal radiation near the roughly 450nm of centre wavelength, light quantity reaches peak value, more long wavelength side is being leaned on than 450nm, light quantity sharply declines, and between 450nm and 500nm, light quantity is roughly " 0 ".On the other hand, than 450nm more short wavelength side, although less than the light quantity reduction at long wavelength side so sharply, light quantity declines from 450nm to 400nm, and at the position lower than 400nm, light quantity is " 0 ".

In contrast, second blue narrow-band-domain light has the distribution shown in the curve B n2 of Fig. 5 B through the spectral transmission of light filter 66, therefore, to the second blue narrow-band-domain light Bn2 of body cavity internal radiation, in the same manner as the first blue narrow-band-domain light Bn1, more lean on long wavelength side at the roughly 450nm of the centre wavelength reaching peak value than light quantity, light quantity sharply reduces.On the other hand, than roughly 450nm more by short wavelength side, different from the first blue narrow-band-domain light Bn1, under the state keeping higher light quantity between 450nm ~ 400nm, light quantity little by little reduces slowly.And near 400nm, light quantity starts sharply to reduce, at the position lower than 400nm, light quantity is " 0 ".Therefore, in the second blue narrow-band-domain light Bn2, although centre wavelength in the first blue narrow-band-domain light Bn1 namely roughly the light quantity of the long wavelength side of 450nm do not change, the light quantity of short wavelength side increases.

Light quantity distribution is as above adopted to be based on following reason the first blue narrow-band-domain light Bn1 and the second blue narrow-band-domain light Bn2.As shown in the distribution of the specific absorbance of Fig. 6 A, the superficial blood vessel of light in raw soma lower than the wavelength near 450nm is subject to extremely strong absorption, but more than the light near 450nm at superficial blood vessel hardly by absorbing directly through.In addition, the distribution as the scattering coefficient of Fig. 6 B is known, the light that wavelength is short, and the scattering in raw soma is stronger.According to the opinion relevant with the light scattering characteristic of raw soma to the optical absorption characteristics of these blood vessels and other opinion, if the wavelength of illumination light is more than near 470nm, then in superficial blood vessel, irradiated illumination light is made to turn back to the leading section 16a of fujinon electronic video endoscope hardly because of the absorption characteristic of strong light.But, in the raw soma surrounding superficial blood vessel, made irradiated a large amount of illumination light reflections by stronger scattering properties, turn back to the leading section 16a of fujinon electronic video endoscope thus.Therefore, the contrast (contrast) of superficial blood vessel and the raw soma around it is high, can fully emphasize to represent superficial blood vessel etc.

For being fully highlighted superficial blood vessel etc., when close shot is observed and when distant view observes during arbitrary observation, about the first blue narrow-band-domain light Bn1 and the second blue narrow-band-domain light Bn2, need to irradiate not containing the illumination light of the light more than the wavelength domain near 470nm.At this, when the distant view of deficiency in light quantity is observed, use relative to the first blue narrow-band-domain light Bn1 than more short wavelength side the second blue narrow-band-domain light Bn2 of making light quantity add near 470nm.

On the other hand, the first green narrow-band-domain light has the distribution shown in the curve Gn1 of Fig. 5 A through the spectral transmission of light filter 67, and therefore, be near 550nm to the first green narrow-band-domain light Gn1 of body cavity internal radiation in centre wavelength, half breadth is 10nm ~ 20nm.In contrast, second green narrow-band-domain light has the distribution shown in the curve Gn2 of Fig. 5 B through the spectral transmission of light filter 68, therefore, to the second green narrow-band-domain light Gn2 of body cavity internal radiation, in the same manner as the first green narrow-band-domain light Gn1, centre wavelength is 550nm, but its half breadth is different from the first green narrow-band-domain light Gn1, is 20 ~ 40nm.That is, wide than the first green narrow-band-domain light Gn1 of the half breadth of the second green narrow-band-domain light Gn2.Therefore, in the second green narrow-band-domain light Gn2, compared with the first green narrow-band-domain light Gn1, light quantity has more the amount that half breadth is widened.

By as follows for the reason that the first green narrow-band-domain light Gn1 and the second green narrow-band-domain light Gn2 is set to above-mentioned light quantity distribution.As shown in the distribution of the specific absorbance of Fig. 6 A, about more than the light near 450nm, the optical absorption characteristics corresponding to blood vessel reduces, but between 500nm ~ 600nm, particularly near 530nm ~ 570nm, the optical absorption characteristics corresponding to the blood vessel of middle level improves.And about the light more than 600nm, absorption characteristic reduces again.In addition, as shown in the distribution of the scattering coefficient of Fig. 6 B, wavelength is longer, and scattering coefficient reduces more gradually, but between 500nm ~ 600nm, the scattering properties in raw soma has almost no change.

Therefore, according to about the opinion of the optical absorption characteristics of these blood vessels and the light scattering characteristic of raw soma and other opinion, at the wavelength of light be between 500nm ~ 600nm, particularly near 530nm ~ 570nm, the change comprising the scattering properties of the raw soma of middle level blood vessel is little, therefore, the light quantity reflecting the light of also return electron forward end section of endoscope 16a by raw soma is roughly certain.In contrast, the middle level blood vessel comprised in this life soma shows higher optical absorption characteristics relative to the light display between 500nm ~ 600nm, particularly near 530nm ~ 570nm, therefore, the ratio turning back to the light of the leading section 16a of fujinon electronic video endoscope in the light of middle level blood vessel irradiation reduces.Therefore, the wavelength of light between 500um ~ 600nm, particularly near 530nm ~ 570nm under, the contrast of middle level blood vessel and the raw soma around it improves, therefore, it is possible to be fully highlighted middle level blood vessel etc.

For being fully highlighted middle level blood vessel etc., when close shot is observed and when distant view observes during arbitrary observations, all need the wavelength band domain of light between 500nm ~ 600nm, preferred 530nm ~ 570nm.If between 500nm ~ 600nm, be preferably in the scope of 530nm ~ 570nm, then can fully be highlighted middle level blood vessel etc., therefore, when the distant view of deficiency in light quantity is observed, use the second green narrow-band-domain light Gn2, it is widened further by the half breadth of the first green narrow-band-domain light Gn1 by centre wavelength being roughly 550nm makes light quantity increase.

When normal light image model, utilize rotary filter 31 B light irradiated to look-out station between (rotary filter 31 1/3 rotate between), as shown in Figure 7 A, B light is carried out opto-electronic conversion and the step accumulating signal charge and the step read as blue image pickup signal by the signal charge of accumulation, alternately repeated with the cycle specified.

Secondly, when illumination light being switched to G light from B light in the rotation by rotary filter 31, between 1/3 of rotary filter 31 rotates, G light is carried out opto-electronic conversion and accumulates the step of signal charge and the step that the signal charge of accumulation reads as green image pickup signal is alternately repeated.

Equally, when utilizing rotary filter 31 that illumination light is switched to R light from G light, between 1/3 of rotary filter 31 rotates, R light being carried out the step of opto-electronic conversion and being alternately repeated as the step that red image pickup signal reads.

In contrast, when special light image pattern, when being in the state that close shot is observed, as shown in Figure 7 B, being selected by rotary filter 31 between first blue narrow-band-domain light Bn1, namely rotary filter 31 1/4 rotate between, the first blue narrow-band-domain light Bn1 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge reads as the first blue narrow-band-domain image pickup signal is alternately repeated by with the cycle of regulation.When switching to the second blue narrow-band-domain light Bn2 in the rotation by rotary filter 31 from the first blue narrow-band-domain light Bn1, irradiating between this second blue narrow-band-domain light Bn2, namely rotary filter 31 1/4 rotate between, do not carry out the accumulation of signal charge and the reading of image pickup signal.

If rotary filter 31 further rotates, then switch to the first green narrow-band-domain light Gn1 from the second blue narrow-band-domain light Bn2.Irradiating between this first green narrow-band-domain light Gn1, namely rotary filter 31 1/4 rotate between, the first green narrow-band-domain light Gn1 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge reads as the first green narrow-band-domain image pickup signal is alternately repeated.Secondly, by the rotation of rotary filter 31, the second green narrow-band-domain light Gn2 is switched to from the first green narrow-band-domain light Gn1.Irradiating between this second green narrow-band-domain light Gn2, namely rotary filter 31 1/4 rotate between, do not carry out the accumulation of signal charge and the reading of image pickup signal.

In addition, when special light image pattern, when being in the state that distant view is observed, as seen in figure 7 c, taking out from rotary filter 31 between first blue narrow-band-domain light Bn1, namely rotary filter 31 1/4 rotate between, do not carry out the accumulation of signal charge and the reading of image pickup signal.When rotary filter 31 further rotates, switch to the second blue narrow-band-domain light Bn2 from the first blue narrow-band-domain light Bn1.Irradiating between this second blue narrow-band-domain light Bn2, namely rotary filter 31 1/4 rotate between, the second blue narrow-band-domain light Bn2 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge reads as the second blue narrow-band-domain image pickup signal is repeated by with the cycle of regulation.

Secondly, the first green narrow-band-domain light Gn1 is switched to from the first blue narrow-band-domain light Bn1.Irradiating between this first green narrow-band-domain light Gn1, namely rotary filter 31 1/4 rotate between, do not carry out the accumulation of signal charge and the reading of image pickup signal.By the rotation of rotary filter 31, switch to the second green narrow-band-domain light Gn2 from the first green narrow-band-domain light Gn1.Between the green narrow-band-domain light Gn2 of irradiation second, namely rotary filter 31 1/4 rotate between, the second green narrow-band-domain light Gn2 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge reads as the second green narrow-band-domain image pickup signal is repeated.

When being set as normal light image model, DSP55 carries out the signal processing such as blank level adjustment, tone process, gray proces, definition process to the blue image pickup signal exported from AFE45, green image pickup signal, red image pickup signal, generates normal light view data.The normal light view data obtained is stored in frame memory 56.

On the other hand, when being set as close shot observing pattern under special light image pattern, above-mentioned signal processing is implemented respectively to the export from AFE45 first blue narrow-band-domain image pickup signal and the first green narrow-band-domain image pickup signal.The each image pickup signal implementing signal processing is stored in frame memory 56 by as close shot by special light image data.In addition, when being set as distant view observing pattern under special light image pattern, in the same manner as close shot observing pattern, second blue narrow-band-domain image pickup signal and the second green narrow-band-domain image pickup signal, respectively after being implemented above-mentioned signal processing, are stored in frame memory 56 as the special light image data of distant view.

Observation state detection unit 57 detects light exposure from the special light image data of close shot and distant view view data arbitrary special light image data being stored in frame memory 56.When the light exposure detected is more than certain value, be judged to be that current point is in close shot observation state.When being judged to be close shot observation state, be automatically made close shot observing pattern.If be set as close shot observing pattern, then the mode obtaining the first blue narrow-band-domain image pickup signal and the first green narrow-band-domain image pickup signal when taking with next time for imaging control part 46 sends instruction (with reference to Fig. 7 B).

On the other hand, when detecting light exposure deficiency certain value, be judged to be that current point is in distant view observation state.When being judged to be in distant view observation state, be automatically made distant view observing pattern.After being set as distant view observing pattern, in the mode obtaining the second blue narrow-band-domain image pickup signal and the second green narrow-band-domain image pickup signal when next time takes, instruction (with reference to Fig. 7 C) is sent for imaging control part 46.

Display control circuit 58, when being in normal light image model, reads normal light view data from frame memory 56, and on monitor 14, shows normal light image based on the normal light view data read.In addition, when being placed in close shot observing pattern in special light image pattern, read the special light image data of close shot from frame memory 56.And, based on the special light image data of close shot read, monitor 14 shows the special light image when close shot shown in Fig. 8 is observed.

In addition, when being placed in distant view observing pattern in special light image pattern, read the special light image data of distant view from frame memory 56.And, on monitor 14, show special light image when distant view shown in Fig. 9 is observed based on the special light image data of the distant view read.In the present invention, by making the broadening deficiency in light quantity compensated when distant view is observed of half breadth to the illumination light of body cavity internal radiation.Now, owing to making half breadth broadening in view of the optical absorption characteristics of blood vessel and the scattering properties of its circumvascular raw soma, so the special light that can not be highlighted superficial blood vessel etc. is observed bring impact.

Secondly, the effect of flow chart to the first embodiment with reference to Figure 10 is described.First, switch SW50 by operation image model, switch to special light image pattern from normal light image model.In special light image pattern, be set as close shot observing pattern in setting in the early stage.Second filter areas 39 of rotary filter 31, according to the switching to special light image pattern, is placed in the light path of wide band light source 30 by light filter switching part 131.By making rotary filter 31 rotate in this condition, the first blue narrow-band-domain light Bn1, the second blue narrow-band-domain light Bn2, the first green narrow-band-domain light Gn1 and the second green narrow-band-domain light Gn2 (being special light) are irradiated to endoceliac look-out station successively.In addition, in special light image pattern, yet initial setting can be set to close shot observing pattern and be set to distant view observing pattern.

And imaging control part 46 is according to only indicating from the mode of CCD44 reading image pickup signal when the first blue narrow-band-domain light Bn1 and the first green narrow-band-domain light Gn1 irradiates to look-out station.Thus, the first blue narrow-band-domain image pickup signal and the first green narrow-band-domain image pickup signal is obtained.After obtained first blue narrow-band-domain image pickup signal and the first green narrow-band-domain image pickup signal are implemented the signal processing such as blank level adjustment, tone process, gray proces, definition process by DSP55, be stored in frame memory 56 as the special light image data of close shot.And, based on the special light image data of the close shot read from frame memory 56, monitor 14 shows the special light image when close shot shown in Fig. 8 is observed.

In addition, observation state detection unit 57 is according to the special light image Data Detection light exposure of close shot being stored in frame memory 56.And when light exposure is more than certain value, be judged to be that the observation state of current point is close shot observation state, former state keeps close shot observing pattern.On the other hand, when the not enough certain value of light exposure, judge that the observation state of current point is as distant view observation state.If it is determined that be distant view observation state, then switch to distant view observing pattern from close shot observing pattern.

According to the switching to distant view observing pattern, imaging control part 46 is only to indicate from the mode of CCD44 reading image pickup signal when making the second blue narrow-band-domain light Bn2 and the second green narrow-band-domain light GI12 irradiates to look-out station.Thus, the second blue narrow-band-domain image pickup signal and the second green narrow-band-domain image pickup signal is obtained.After obtained second blue narrow-band-domain image pickup signal has been implemented the signal processing identical with during close shot observing pattern with the second green narrow-band-domain image pickup signal by DSP55, be stored in frame memory 56 as the special light image data of distant view.And, based on the special light image data of the distant view read from frame memory 56, monitor 14 shows the special light image when distant view shown in Fig. 9 is observed.

When distant view observing pattern, in the same manner as also when close shot observing pattern, observation state detection unit is utilized to carry out the judgement of observation state.Therefore, when light exposure is more than certain value, close shot observing pattern is switched to from distant view observing pattern.On the other hand, when the not enough certain value of light exposure (light exposure is not enough certain value but when fully can be highlighted superficial blood vessel etc.), as long as set special light image pattern, just can former state continuation distant view observing pattern.

Secondly, with reference to Figure 11, the second embodiment of the present invention is described.In this second embodiment, electronic endoscope system 100 uses two panels rotary filter and sends the face order light of RGB or special light.In addition, only portion's materials different in the first embodiment and the second embodiment is described, and for common component omission explanation.

Normal light rotary filter 101 and special light rotary filter 102 is provided with in light supply apparatus 13.Normal light rotary filter 101 and special light rotary filter 102 with rotating shaft 101a by motor 103,104, are pressed certain speed and are rotated centered by 102a.

As shown in figure 12, at normal light with on rotary filter 101, be provided with in the circumferential direction in order: make the light of blue band domain in wide band light BB (B light) through blue light through light filter 110, make the light (G light) of wide band light BB Green band domain through green light through light filter 111, make the light of red band domain in wide band light BB (R light) through red light through light filter 112, make wide band light BB directly through peristome 113.Normal light is with in rotary filter 101, and through light filter 110, green light, through light filter 111, red light, through in light filter 112 and peristome 113, any one enters in the light path of wide band light source 30 blue light.

On the other hand, as shown in figure 13, special light rotary filter 102 is provided with in order in the circumferential direction: make the first blue narrow-band-domain light Bn1 when observing for close shot in wide band light BB through the first blue narrow-band-domain light through light filter 115, make the second blue narrow-band-domain light Bn2 when observing for distant view in wide band light BB through the second blue narrow-band-domain light through light filter ll6, make the first green narrow-band-domain light Gn1 when observing for close shot in wide band light BB through the first green narrow-band-domain light through light filter 117, make the second green narrow-band-domain light Gn2 when observing for distant view in wide band light BB through the second green narrow-band-domain light through light filter 118.

Special light rotary filter 102 is provided with the light filter switching part 120 making rotating shaft 102a in the direction movement orthogonal with the light path of wide band light BB.By this light filter switching part 120, special light rotary filter 102 make the first blue narrow-band-domain light through the blue narrow-band-domain light of light filter 115, second through the green narrow-band-domain light of light filter 116, first through light filter 117 and the second green narrow-band-domain light through light filter 118 in the on position of any one light filter in the light path of wide band light source 30 and make rotary filter overall between the retreating position that the light path of wide band light BB is kept out of the way mobile freely.

In this second embodiment, when being set as normal light image model, special light rotary filter 102 is placed in retreating position.Therefore, the wide band light BB from wide band light source 30 irradiates directly to normal light rotary filter 101.In this condition, by making normal light rotary filter 101 rotate, by B light, G light, R light, wide band light BB irradiation body intracavity in order.

In this second embodiment, owing to being provided with the peristome 113 of special light transmission on normal light rotary filter 101, so not only by B light, G light, R light but also can by wide band light BB to body cavity internal radiation.Therefore, when controlling by imaging control part 46 CCD44 receiving endoceliac reflected light, as shown in figure 14, in irradiation B light, G light, R light time, identical with the first embodiment, carry out accumulation and the reading of signal; But when irradiating wide band light BB, do not carry out accumulation and the reading of signal.

On the other hand, when being set as special light image pattern, special light rotary filter 102 is placed on position.And, when the peristome 113 of normal light rotary filter 101 is positioned in the light path of wide band light BB, the rotation of normal light rotary filter 101 is stopped.In this condition, by making special light rotary filter 102 rotate, the first blue narrow-band-domain light Bn1, the second blue narrow-band-domain light Bn2, the first green narrow-band-domain light Gn1, the second green narrow-band-domain light Gn2 are irradiated in body cavity in order.Under special light image pattern, to kind and the order identical (with reference to Fig. 7 B, Fig. 7 C) of the illumination light of body cavity internal radiation, therefore, the control of the CCD44 carried out about imaging control part 46 is omitted.

Figure 15 represents the electronic endoscope system 200 of third embodiment of the invention.In the 3rd embodiment, use colored CCD as imaging apparatus, therefore, can by wide band light BB directly to body cavity internal radiation, the shooting carrying out 1 time just can obtain blue image pickup signal, green image pickup signal, red image pickup signal simultaneously.In addition, replace utilizing rotary filter to extract special light from wide band light BB, and utilize the light sources such as LED directly to produce special light.In addition, the part common with above-mentioned each embodiment marks common symbol, and the description thereof will be omitted.

Wide band light source 30, shutter 201, blue-light source 202, green light source 203, bonder 204, light source control portion 205 is provided with in light supply apparatus 13.Shutter 201 is arranged between wide band light source 30 and collecting lens 37, and insert the light path of wide band light BB and by the on position of wide band light BB shading and keep out of the way from position and allow wide band light BB towards collecting lens 37 retreating position between mobile freely.When being set as normal light image model, shutter 201 is placed in retreating position.On the other hand, when being set as special light image pattern, shutter 201 is placed on position.The wide band light BB penetrated from collecting lens 37 is incident to wide band light optical fiber 210.

As blue-light source 202, such as, use LED (Light Emitting Diode), optionally produce these two kinds of blue lights of the first blue narrow-band-domain light Bn1 and the second blue narrow-band-domain light Bn2.These first blue narrow-band-domain light Bn1 are the wavelength domain identical with above-mentioned embodiment with the second blue narrow-band-domain light Bn2.In addition, blue-light source 202 can make the scope Ra of the half breadth of the second blue narrow-band-domain light Bn2 shown in Figure 16 expand or reduce.The illumination light sent by this blue-light source 202 is incident to blue light optical fiber 211.

Green light source 203 is also LED, optionally produces these two kinds of green light of the first green narrow-band-domain light Gn1 and the second green narrow-band-domain light Gn2.This green light source 203 is also identical with blue light source 202, and the scope Rb of the half breadth of the second green narrow-band-domain light Gn2 shown in Figure 16 can be made to expand or reduce.The illumination light produced by green light source 203 is incident to green light optical fiber 212.

In 3rd embodiment, owing to have adjusted the half breadth of the second blue narrow-band-domain light Bn2 and the second green narrow-band-domain light Gn2, so in the signal processing (tone process etc.) under DSP after obtaining image pickup signal, need when close shot is observed and distant view observes time carry out different process.But, if the ratio of blue image pickup signal when blue image pickup signal when observing according to close shot and the brightness ratio Lb/Lg between green image pickup signal and distant view are observed and brightness ratio the Lb '/Lg ' between green image pickup signal is the half breadth that certain mode regulates the second blue narrow-band-domain light Bn2 and the second green narrow-band-domain light Gn2, then can carry out identical signal processing (tone process etc.) when close shot is observed and when distant view observes.At this, Lb represents the brightness value of the first blue narrow-band-domain image pickup signal, and Lg represents the brightness value of the first green narrow-band-domain image pickup signal, and Lb ' represents the brightness value of the second blue narrow-band-domain image pickup signal, and Lg ' represents the brightness value of the second green narrow-band-domain image pickup signal.About brightness ratio Lb/Lg, Lb '/Lg ', the brightness ratio calculating part 215 in the processor device 12 be connected with light source control portion 205 calculates.

Photoconduction 35 in fujinon electronic video endoscope, wide band light optical fiber 210, blue light optical fiber 211 and green light optical fiber 212 link by bonder 204.Thus, wide band light BB is incident to photoconduction 35 with optical fiber 210 via wide band light.In addition, the first blue narrow-band-domain light Bn1 and the second blue narrow-band-domain light Bn2 is incident to photoconduction 43 via blue light optical fiber 211.First green narrow-band-domain light Gn1 and the second green narrow-band-domain light Gn2 is incident to photoconduction 35 via green light optical fiber 212.

Light source control portion 205 is connected with the controller 59 in processor device 12, and controls blue-light source 202 and green light source 203 based on the instruction carrying out self-controller 59.When being set as normal light image model, blue-light source 202 and green light light source 203 are OFF (extinguishing).In contrast, when being set as close shot observing pattern under special light image pattern, make wide band light BB under endoceliac state of irradiating stopping by shutter 201 to the placement of on position, in during the image pickup signal obtaining 1 frame amount, there is the first blue narrow-band-domain light Bn1 from blue-light source 202.Afterwards, there is the first green narrow-band-domain light Gn1 obtaining in period of 1 frame from green light source 203 equally.In addition, when being set as distant view observing pattern under special light image pattern, stop wide band light BB under the state of endoceliac irradiation identical with close shot observing pattern, from blue-light source 202, second blue narrow-band-domain light Bn2 occurs obtaining in period of 1 frame.Afterwards, there is the second green narrow-band-domain light Gn2 obtaining in period of 1 frame from green light source 203.

Colored CCD 220 receives the light from collecting lens 51 by imaging surface 220a, the light received is carried out to opto-electronic conversion and accumulates signal charge, and is read as image pickup signal by this signal charge.The R pixel of the color filter being provided with arbitrary color in R color, G color, B color, G pixel, these three kinds of colour elements of B pixel are arranged with at this imaging surface 220a.Therefore, when be have received wide band light BB by colored CCD 220, obtain red image pickup signal from R pixel, obtain green image pickup signal from G pixel, obtain blue image pickup signal from B pixel.

In addition, when have received the first blue narrow-band-domain light Bn1 or the second blue narrow-band-domain light Bn2 by colored CCD 220, export the first blue narrow-band-domain image pickup signal or the second blue narrow-band-domain image pickup signal from B pixel.In addition, when have received the first green narrow-band-domain light Gn1 or the second green narrow-band-domain light Gn2 by colored CCD 220, export the first green narrow-band-domain image pickup signal or the second green narrow-band-domain image pickup signal from G pixel.

Imaging control part 46, by controlling the shooting of colored CCD 220, reads image pickup signal with the frame rate specified, is delivered to AFE45.When being set as normal light image model, as shown in Figure 17 A, obtaining in period at 1 frame, carries out carrying out opto-electronic conversion to wide band light BB and the step accumulating signal charge and the step read as blue image pickup signal, green image pickup signal, red image pickup signal by these signal charges.This action is performed repeatedly with the cycle period of regulation when being set as normal light image model.

In contrast, when being set as close shot observing pattern in special light image pattern, as seen in this fig. 17b, obtaining in period at 1 frame, carries out the first blue narrow-band-domain light Bn1 to carry out opto-electronic conversion and the step accumulating signal charge and the step read as the first blue narrow-band-domain image pickup signal by this signal charge.After the reading of the first blue narrow-band-domain image pickup signal terminates, obtaining in period at next frame, carries out the first green narrow-band-domain light Gn1 to carry out opto-electronic conversion and the step accumulating signal charge and the step read as the first green narrow-band-domain image pickup signal by this signal charge.These actions are performed repeatedly with the cycle period of regulation when being set as close shot observing pattern.

In addition, equally, when being set as distant view observing pattern in special light image pattern, as shown in Figure 17 C, obtaining in period at 1 frame, carries out the second blue narrow-band-domain light Bn2 to carry out opto-electronic conversion and the step accumulating signal charge and the step read as the second blue narrow-band-domain image pickup signal by this signal charge.After the reading of the second blue narrow-band-domain image pickup signal terminates, obtaining in period at next frame, carries out the second green narrow-band-domain light Gn2 to carry out opto-electronic conversion and the step accumulating signal charge and the step read as the second green narrow-band-domain image pickup signal by this signal charge.These actions are performed repeatedly with the cycle period of regulation when being set as distant view observing pattern.

In above-mentioned first ~ three embodiment, under distant view observing pattern, by the second blue narrow-band-domain light Bn2 making half breadth larger than the first blue narrow-band-domain light Bn1, and the second green narrow-band-domain light Gn2 making half breadth larger than the first green narrow-band-domain light Gn1, eliminates deficiency in light quantity.But, under deficiency in light quantity almost absent variable situation, also only can to increase in the first blue narrow-band-domain light Bn1 and the first green narrow-band-domain light Gn1 the half breadth of any one.Such as, in the first embodiment, also when distant view observing pattern, half breadth can not increased for blue light, and directly continue the blue narrow-band-domain light Bn1 of use first, green light is used to the second green narrow-band-domain light Gn2 broadening half breadth.In this situation, as shown in figure 18, in the control of the CCD carried out in imaging control part, only carrying out accumulation and the reading of signal when having irradiated the first blue narrow-band-domain light Bn1 and the second green narrow-band-domain light Gn2, not carrying out accumulation and the reading of signal when irradiation second blue narrow-band-domain light Bn2 and the first green narrow-band-domain light Gn1.

In addition, in above-mentioned first ~ three embodiment, image pickup signal two side when using image pickup signal when irradiating light (the first or second blue narrow-band-domain light Bn1, the Bn2) of blue band domain and irradiate light (the first or second green narrow-band-domain light Gn1, the Gn2) of green band domain generates special light image, but either party that also only can use the light of the light of blue band domain or green band domain generates special light image.

In addition, in the above-described 3rd embodiment, blue-light source is arranged to the function of the half breadth of fine adjustment light, and green light source is also arranged to the function of the half breadth of fine adjustment light, but in the signal processing such as blank level adjustment, tone process, gray proces, definition process such as carried out at the DSP by processor device, when close shot is observed and when implementing signal processing respectively when distant view observes, the function of fine adjustment half breadth also can not be set blue-light source and green light source.

In the above-described embodiment, by widening the half breadth of the narrow-band-domain light of blue narrow-band-domain light or green, compensate deficiency in light quantity when distant view is observed, but on this basis when using red narrow-band-domain light to carry out distant view observation, the half breadth of red narrow-band-domain light can also be widened.

In the above-described embodiment, when close shot is observed and when distant view observes, half breadth is changed, but preferably by its further vague generalization, according to the distance of endoscope distal end portion and irradiated body tissue, the half breadth of narrow-band-domain light is changed (far away with the distance of irradiated body distance, more increase half breadth), its distance is nearer, more reduces half breadth.

Claims

1. an electronic endoscope system, it comprises:

Light irradiation device, multiple narrow-band-domain light is optionally irradiated in body cavity by it, and comprises in described multiple narrow-band-domain light: have the first blue narrow-band-domain light of the centre wavelength near 450nm, have the first green narrow-band-domain light of the centre wavelength near 550nm, relatively described first blue narrow-band-domain light makes than more not increasing by the light quantity of long wavelength side near 450nm and only make the second blue narrow-band-domain light increased than the light quantity more by short wavelength side near 450nm and the second green narrow-band-domain light expanded with certain limit by the half breadth of described first green narrow-band-domain light;

Imaging apparatus, it is taken described endoceliac irradiated body tissue and produces image pickup signal, and this imaging apparatus is configured in the endoscope distal end portion inserted in described body cavity;

Observation state decision maker, whether it determines whether to have carried out shooting under the distance of described endoscope distal end portion and described irradiated body tissue is near state and close shot observation state based on described image pickup signal or takes under the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state; And

Video camera controller, it controls described imaging apparatus, thus, when being judged to be described close shot observation state, takes the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described first green narrow-band-domain light; When being judged to be described distant view observation state, the described irradiated body tissue thrown light on by described second blue narrow-band-domain light and described second green narrow-band-domain light is taken.

2. electronic endoscope system as claimed in claim 1, wherein,

Described light irradiation device possesses:

Blue-light source, it optionally produces described first blue narrow-band-domain light and described second blue narrow-band-domain light; And

Green light source, it optionally produces described first green narrow-band-domain light and described second green narrow-band-domain light.

3. electronic endoscope system as claimed in claim 2, wherein,

In described blue-light source or described green light source, described half breadth scalable.

4. electronic endoscope system as claimed in claim 3, wherein,

Described blue-light source or described green light source are the mode of certain value according to the ratio of the brightness ratio Lb/Lg under described close shot observation state and brightness ratio the Lb '/Lg ' when described distant view is observed, the half breadth of described second blue narrow-band-domain light or described second green narrow-band-domain light is regulated, and

Lb: take by described imaging apparatus the first blue image pickup signal that described irradiated body tissue obtains under described close shot observation state in the irradiation of described first blue narrow-band-domain light,

Lg: take by described imaging apparatus the first green image pickup signal that described irradiated body tissue obtains under described close shot observation state in the irradiation of described first green narrow-band-domain light,

Lb ': take by described imaging apparatus the second blue image pickup signal that described irradiated body tissue obtains under described distant view observation state in the irradiation of described second blue narrow-band-domain light,

Lg ': take by described imaging apparatus the second green image pickup signal that described irradiated body tissue obtains under described distant view observation state in the irradiation of described second green narrow-band-domain light.

5. electronic endoscope system as claimed in claim 3, wherein,

According to the regulated quantity of the half breadth of described second blue narrow-band-domain light or described second green narrow-band-domain light, the signal processing of the view data generating monitor display from described image pickup signal is changed.

6. electronic endoscope system as claimed in claim 1, wherein,

Described light irradiation device comprises:

Wide band light source, it sends the wide band light from blue band domain to red band domain;

Rotary filter, it is for taking out described narrow-band-domain light from described wide band light, and this rotary filter has: make described first blue narrow-band-domain light through the first blue narrow-band-domain light through light filter, make described second blue narrow-band-domain light through the second blue narrow-band-domain light through light filter, make described first green narrow-band-domain light through the first green narrow-band-domain light through light filter and make described second green narrow-band-domain light through the second green narrow-band-domain light through light filter.

7. electronic endoscope system as claimed in claim 1, wherein,

Described observation state decision maker detects light exposure according to described image pickup signal, and, when detected light exposure is more than certain value, be judged to be described close shot observation state; When not enough certain value, be judged to be described distant view observation state.

8. an electronic endoscope system, it comprises:

Imaging apparatus, it is taken endoceliac irradiated body tissue and produces image pickup signal, and this imaging apparatus is configured in the endoscope distal end portion inserted in described body cavity;

Light irradiation device, multiple narrow-band-domain light is optionally irradiated in described body cavity by it, first of the centre wavelength had near 450nm blue narrow-band-domain light and the first green narrow-band-domain light of centre wavelength of having near 550nm, when being judged to be described close shot observation state, are irradiated by this light irradiation device; And, when being judged to be described distant view observation state, relatively described first blue narrow-band-domain light being made the second blue narrow-band-domain light of only making than more not increasing by the light quantity of long wavelength side near 450nm to increase than the light quantity more by short wavelength side near 450nm and the second green narrow-band-domain light that the half breadth of described first green narrow-band-domain light expands with certain limit is irradiated.

9. an electronic endoscope system, it comprises:

Observation state decision maker, it determines whether that the distance inserting described endoceliac endoscope distal end portion and described endoceliac irradiated body tissue is near state and close shot observation state or be whether the distance of described endoscope distal end portion and described irradiated body tissue is state far away and distant view observation state; And

Imaging apparatus, it is configured in described endoscope distal end portion, and when being judged to be under described close shot observation state, this imaging apparatus is taken the described irradiated body tissue thrown light on by described first blue narrow-band-domain light and described first green narrow-band-domain light; When being judged to be described distant view observation state, this imaging apparatus is taken the described irradiated body tissue thrown light on by described second blue narrow-band-domain light and described second green narrow-band-domain light.

10. a processor device, it is for carrying out image procossing to the image pickup signal from endoscope, described endoscope has following functions, namely, by the first blue narrow-band-domain light of centre wavelength had near 450nm, there is the first green narrow-band-domain light of the centre wavelength near 550nm, relatively described first blue narrow-band-domain light makes the second blue narrow-band-domain light of only making than more not increasing by the light quantity of long wavelength side near 450nm to increase than the light quantity more by short wavelength side near 450nm and the half breadth of described first green narrow-band-domain light is optionally carried out in body cavity the function of irradiating with the second green narrow-band-domain light that certain limit expands, with the function being produced described image pickup signal by the imaging apparatus shooting irradiated body tissue configured in the endoscope distal end portion inserted in described body cavity,

Described processor device comprises: