Endoscope system
An endoscope system includes an endoscope and a control device. The endoscope includes an illumination optical system with a fluorescent body formed in an optical path and an imaging optical system with an imaging element outputting an imaging signal of an optical image. The control device includes a light source unit which supplies an excitation light to the illumination optical system so as to emit light from the fluorescent body and an image processing section which corrects the imaging signal output from the imaging element. The image processing section includes: an illumination light spectrum calculating unit, a chromaticity correction table creating unit and an image correcting unit.
1. A endoscope system comprising:
an endoscope that includes an illumination optical system with a fluorescent body formed in an optical path and an imaging optical system with an imaging element outputting an imaging signal of an optical image;
and a control device that includes a light source unit which supplies an excitation light to the illumination optical system so as to emit light from the fluorescent body and an image processing section which corrects the imaging signal output from the imaging element, wherein the image processing section includes:
an illumination light spectrum calculating unit for calculating an illumination light spectrum obtained by the illumination optical system based on individual information of light emission characteristics of the fluorescent body provided in the endoscope connected to the control device and individual information of light emission characteristics of the light source unit;
a chromaticity correction table creating unit for creating a chromaticity correction table to correct chromaticity information of the imaging signal based on a difference between the spectral characteristics profile of the standard light and the spectral characteristics of the actual illumination light;
and an image correcting unit for correcting the imaging signal output from the imaging element by referring the created chromaticity correction table.
2. The endoscope system according to claim 1 , wherein the individual information of the light emission characteristics of the fluorescent body includes information of an excitation spectrum representing light absorbing characteristics of the fluorescent body and information of a light emission spectrum of the light excited by absorbed optical energy and emitted from the fluorescent body.
3. The endoscope system according to claim 2 , wherein the individual information of the light emission characteristics of the light source unit includes information of a light emission wavelength of the light source unit.
4. The endoscope system according to claim 1 , wherein the endoscope includes an endoscope characteristics storing section that stores individual information of the light emission characteristics of the fluorescent body.
5. The endoscope system according to claim 4 , further comprising:
a connection detecting unit for detecting whether the endoscope is connected to the control device,
wherein the image processing section obtains the individual information of the light emission characteristics of the fluorescent body from the endoscope characteristics storing section of the endoscope connected to the control device based on a trigger of detecting that the endoscope switches from a non-connection state to a connection state, and creates the chromaticity correction table.
6. The endoscope system according to claim 1 , wherein the control device includes a light source information storing section that stores the individual information of the light emission characteristics of the light source unit.
7. The endoscope system according to claim 1 , wherein the light source unit includes a semiconductor light emitting element as a light emitting source.
8. The endoscope system according to claim 7 , wherein the light source unit includes a multiplexer unit for multiplexing the lights emitted from a plurality of the semiconductor light emitting elements and supplying the multiplexed light to the illumination optical system of the endoscope.
9. The endoscope system according to claim 8 ,
wherein the endoscope includes a plurality of illumination ports, an illumination port of the plurality of illumination ports including the fluorescent body, and a plurality of light guiding paths disposed in the fluorescent body so as to face a light emission end, and
wherein the light source unit includes a demultiplexer unit for demultiplexing and supplying the multiplexed light to a light guiding path of the plurality of light guiding paths.
10. The endoscope system according to claim 9 , wherein the multiplexer unit and the demultiplexer unit are configured as a single fiber coupler.
11. The endoscope system according to claim 9 , wherein each of the multiplexer unit and the demultiplexer unit is configured as a dichroic mirror.
12. The endoscope system according to claim 1 , wherein the image processing section creates the chromaticity correction table based on individual information of spectral characteristics of a color filter of the imaging element in addition to the individual information of the light emission characteristics of the fluorescent body and the individual information of the light emission characteristics of the light source unit.
13. The endoscope system according to claim 12 , wherein the endoscope includes an endoscope characteristics storing section that stores the individual information of the light emission characteristics of the fluorescent body and the individual information of the spectral characteristics of the color filter of the imaging element.
14. The endoscope system according to claim 1 , wherein the control device creates the chromaticity correction table that subjects the imaging signal to the chromaticity correction table corresponding to a difference between a spectral characteristic of standard light and a spectral characteristic of actual illumination light.