Control device
A control device includes one or more processors including hardware, the one or more processors being configured to: generate a white light image based on a first image signal captured as a result of irradiating a subject with a white light; generate a narrow-band light image based on a second image signal captured as a result of irradiating the subject with a narrow-band light; control a light intensity of the white light to a first value which is determine according to brightness of the white light image and according to a first ratio; and control a light intensity of the narrow-band light to a second value which is determine according to brightness of the narrow-band light image and according to a second ratio that is different than the first ratio.
1 . A control device comprising:
one or more processors comprising hardware, the one or more processors being configured to:
generate a white light image based on a first image signal captured as a result of irradiating a subject with a white light;
generate a first narrow-band light image based on a second image signal captured as a result of irradiating the subject with a first narrow-band light;
generate a second narrow-band light image based on a third image signal captured as a result of irradiating the subject with a second narrow-band light,
control a light intensity of the white light to a first value which is determined according to brightness of the white light image and according to a first ratio, wherein:
when brightness of the first narrow-band light image is equal to or greater than a threshold value, the one or more processors being configured to control a light intensity of the first narrow-band light to be equal to a first predetermined light intensity, and
when brightness of the second narrow-band light image is equal to or greater than a threshold value, the one or more processors being configured to control a light intensity of the second narrow-band light to be equal to a second predetermined light intensity.
2 . The control device according to claim 1 , wherein the one or more processors being configured to
control the light intensity of the white light such that the brightness of a normal light image becomes constant.
3 . The control device according to claim 1 , wherein the first predetermined light intensity and second predetermined light intensity is set according to a predetermined value, a parameter related to the narrow-band light image, a parameter related to a device comprising an image sensor configured to perform imaging of the subject, an observation mode, or observation distance.
4 . The control device according to claim 1 , wherein
the first predetermined light intensity is set according to a parameter related to the first narrow-band light image, and
the second predetermined light intensity is set to a predetermined value.
5 . The control device according to claim 1 , wherein
in a first observation mode, the one or more processors being configured to set the first predetermined light intensity to be greater than the second predetermined light intensity, and
in a second observation mode, the one or more processors being configured to set the second predetermined light intensity to be greater than the first predetermined light intensity.
6 . The control device according to claim 5 , wherein the first observation mode and the second observation mode are switchable according to a user operation.
7 . The control device according to claim 1 , wherein the one or more processors being configured to generate an image obtained by performing a gain correction with respect to the narrow-band light image such that the brightness of the narrow-band light image is equal to a predetermined value.
8 . The control device according to claim 1 , wherein the one or more processors being configured to generate an image obtained by performing a gain correction with respect to the narrow-band light image such that the brightness of the narrow-band light image is equal to or greater than a predetermined value.
9 . The control device according to claim 7 , wherein the one or more processors being configured to set a gain with respect to the narrow-band light to a third value which is determined according to the brightness of the narrow-band light image and according to a third ratio.
10 . The control device according to claim 9 , wherein the one or more processors being configured to set a gain with respect to the white light image and a gain with respect to the narrow-band light image such that a ratio between the brightness of the white light image and the brightness of the narrow-band light image becomes substantially constant.
11 . The control device according to claim 1 , wherein the one or more processors being configured to generate a superimposed image by superimposing the white light image and one of the first narrow-band light image or second narrow-band light image.
12 . The control device according to claim 11 , wherein the one or more processors being configured to generate the superimposed image by correcting color balance of the white light image such that there is a decrease in a component corresponding to the narrow-band light in the superimposed image.
13 . The control device according to claim 12 , wherein the one or more processors being configured to generate the superimposed image by adjusting color balance of the white light image such that a maximum contrast is achieved between a region of interest in the narrow-band light image and background other than the region of interest.
14 . The control device according to claim 12 , wherein the one or more processors being configured to correct the color balance of the white light image such that background of the superimposed image has a same color shade as a color shade of background of the white light image.
15 . The control device according to claim 11 , wherein the one or more processors being configured to correct light intensity balance of the white light such that there is a decrease in a component corresponding to the narrow-band light in the superimposed image.
16 . The control device according to claim 15 , wherein the one or more processors being configured to correct the light intensity balance of the white light image such that a maximum contrast is achieved between a region of interest in the narrow-band light image and background other than the region of interest.
17 . The control device according to claim 15 , wherein the one or more processors is configured to correct the light intensity balance of the white light such that background of the superimposed image has a same color shade as a color shade of background of the normal light image.
18 . An endoscope system comprising:
the control device according to claim 1 ;
a light source device configured to irradiate the normal light and the narrow-band light; and
an endoscope configured to output first and second signals.