Endoscope system, processor of endoscope system, and image producing method
First Claim
1. An endoscope system comprising:
- a light projecting device for projecting a first illumination light of a first wavelength range and a second illumination light of a second wavelength range different from the first wavelength range into a test subject body, wherein a light absorption coefficient of blood hemoglobin varies with an oxygen saturation thereof in the first wavelength range;
an image signal capturing device using an imaging device to capture a first image signal from the first illumination light as reflected from inside the test subject body and a second image signal from the second illumination light as reflected from inside the test subject body;
an image producing device for producing a subject image of the test subject from the second image signal;
an oxygen saturation calculating device for numerically calculating oxygen saturation levels of the test subject using the first image signal;
a gain memory for memorizing oxygen saturation levels in association with gains for changing pixel levels of the subject image according to the oxygen saturation levels;
an image color processing device that determines, with reference to said gain memory, the gains corresponding to the oxygen saturation levels calculated by said oxygen saturation calculating device, and the pixel levels of the second image signal being multiplied by the determined gains to produce an oxygen saturation image by changing color properties of the subject image according to the calculated oxygen saturation levels; and
a display device for displaying the oxygen saturation image,wherein the second illumination light comprises white light, and the subject image comprises an ordinary image captured under the white light,wherein the gains are constant regardless of the oxygen saturation levels in a range above a given oxygen saturation level in the ordinary light image, andwherein the gains increase or decrease depending on the oxygen saturation levels in a range below the given oxygen saturation level in the ordinary light image.
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Accused Products
Abstract
First illumination light of a first wavelength range, in which light absorption coefficient of blood hemoglobin varies with oxygen saturation thereof, is projected into a test subject body, to capture a first image signal from the first illumination light as reflected from inside the test subject body. Then second illumination light of a second wavelength range different from the first wavelength range is projected into a test subject body, to capture a second image signal from the second illumination light as reflected from inside the test subject body. A subject image of the test subject is produced from the second image signal. Oxygen saturation levels of the test subject are calculated using the first and second image signals. According to the calculated oxygen saturation levels, color properties of the subject image are changed to produce an oxygen saturation image.
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Citations
16 Claims
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1. An endoscope system comprising:
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a light projecting device for projecting a first illumination light of a first wavelength range and a second illumination light of a second wavelength range different from the first wavelength range into a test subject body, wherein a light absorption coefficient of blood hemoglobin varies with an oxygen saturation thereof in the first wavelength range; an image signal capturing device using an imaging device to capture a first image signal from the first illumination light as reflected from inside the test subject body and a second image signal from the second illumination light as reflected from inside the test subject body; an image producing device for producing a subject image of the test subject from the second image signal; an oxygen saturation calculating device for numerically calculating oxygen saturation levels of the test subject using the first image signal; a gain memory for memorizing oxygen saturation levels in association with gains for changing pixel levels of the subject image according to the oxygen saturation levels; an image color processing device that determines, with reference to said gain memory, the gains corresponding to the oxygen saturation levels calculated by said oxygen saturation calculating device, and the pixel levels of the second image signal being multiplied by the determined gains to produce an oxygen saturation image by changing color properties of the subject image according to the calculated oxygen saturation levels; and a display device for displaying the oxygen saturation image, wherein the second illumination light comprises white light, and the subject image comprises an ordinary image captured under the white light, wherein the gains are constant regardless of the oxygen saturation levels in a range above a given oxygen saturation level in the ordinary light image, and wherein the gains increase or decrease depending on the oxygen saturation levels in a range below the given oxygen saturation level in the ordinary light image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A processor for an endoscope system including an endoscope that projects a first illumination light of a first wavelength range and a second illumination light of a second wavelength range different from the first wavelength range into a test subject body, and captures a first image signal and a second image signal respectively from the first illumination light and the second illumination light as reflected from inside the test subject body, wherein a light absorption coefficient of blood hemoglobin varies with oxygen saturation thereof in the first wavelength range, said processor comprising:
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a signal receiving device for receiving the first and second image signals from said endoscope; an image producing device for producing a subject image of the test subject from the second image signal; an oxygen saturation calculating device for numerically calculating oxygen saturation levels of the test subject using the first image signal; and a gain memory for memorizing oxygen saturation levels in association with gains for changing pixel levels of the subject image according to the oxygen saturation levels; and an image color processing device that determines, with reference to said gain memory, the gains corresponding to the oxygen saturation levels calculated by said oxygen saturation calculating device, and the pixel levels of the second image signal being multiplied by the determined gains to produce an oxygen saturation image by changing color properties of the subject image according to the calculated oxygen saturation levels, wherein the second illumination light comprises white light, and the subject image comprises an ordinary image captured under the white light, wherein the gains are constant regardless of the oxygen saturation levels in a range above a given oxygen saturation level in the ordinary light image, and wherein the gains increase or decrease depending on the oxygen saturation levels in a range below the given oxygen saturation level in the ordinary light image.
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16. An image producing method comprising:
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projecting a first illumination light of a first wavelength range and a second illumination light of a second wavelength range different from the first wavelength range into a test subject body, wherein a light absorption coefficient of blood hemoglobin varies with oxygen saturation thereof in the first wavelength range; capturing a first image signal from the first illumination light as reflected from inside the test subject body; capturing a second image signal from the second illumination light as reflected from inside the test subject body; producing a subject image of the test subject from the second image signal; numerically calculating oxygen saturation levels of the test subject using the first image signal; and memorizing oxygen saturation levels in association with gains for changing pixel levels of the subject image according to the oxygen saturation levels; determining, with reference to said gains memory, the gains corresponding to the oxygen saturation levels calculated by said oxygen saturation calculating device, and the pixel levels of the second image signal being multiplied by the determined gains to produce an oxygen saturation image by changing color properties of the subject image according to the calculated oxygen saturation levels, wherein the second illumination light comprises white light, and the subject image comprises an ordinary image captured under the white light, wherein the gains are constant regardless of the oxygen saturation levels in a range above a given oxygen saturation level in the ordinary light image, and wherein the gains color increase or decrease depending on the oxygen saturation levels in a range below the given oxygen saturation level in the ordinary light image.
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Specification