Endoscope having illuminance ratio adjusting device between moving and still picture images
AssigneeKabushiki Kaisha Toshiba
InventorsToshio Funakoshi, Katsuya Kikuchi
Life of this patent
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Abstract
An endoscope in which moving and still picture image pickup operations are alternatively carried out, and a light source emits either a continuous light or a pulsed light in the moving or still picture image pickup operations, a detector detects illuminances of moving and still picture images in the moving and still picture image pickup operations to obtain an illuminance ratio between the moving and still picture images, and the illuminance ratio is adjusted to a certain value by an adjuster on the basis of the illuminance ratio detected by the detector.
Claims13
An endoscope having a scope in which moving and still image pickup operations are alternatively carried out, comprising:
- light source means for selectively emitting a continuous light and a pulsed light in moving and still pickup operations;
- brightness detecting means for detecting brightness of both the continuous light and the pulsed light to obtain brightness signals of both the continuous light and the pulsed light;
- brightness signal processing means for processing both of said continuous light brightness signal and said pulsed light brightness signal to obtain a light control signal;
- and
- light source controlling means for controlling the luminous energy of said light source means by varying a current of a light valve employed in said light source means in response to said light control signal in order to substantially equalize the brightness of the moving image with the brightness of the still image.
An endoscope having a scope, in which moving and still pickup operations are alternatively carried out, the endoscope comprising:
- light source means for selectively emitting a continuous light and a pulsed light during the moving or still image pickup operations, respectively;
- image pickup means for picking up an endoscopic image of a biological body under medical examination while selectively irradiating said continuous light and said pulsed light thereto, thereby obtaining a moving picture signal and a still picture signal;
- luminous signal producing means for processing said moving image signal and said still image signal to obtain an illuminous ratio A/B between illuminance A of said moving image signal and illuminance B of said still image signal;
- and
- image signal processing means for processing said moving image signal and said still image signal derived from said image pickup means based upon said illuminous ratio A/B, in order to substantially equalize the brightness of the moving image with the brightness of the still image.
An endoscope having a scope in which moving and still image pickup operations are alternatively carried out, the endoscope comprising:
- light source means for selectively emitting a continuous light or a pulsed light during said moving or still image pickup operations, respectively;
- image pickup means for picking up an endoscopic image of a biological body under medical examination while selectively irradiating said continuous light and said pulsed light thereto, thereby obtaining a moving image signal and a still image signal;
- brightness detecting means for detecting the brightness of both the continuous light and the pulsed light, to obtain brightness signals of both the continuous light and the pulsed light;
- brightness signal processing means for processing both of said continuous light processing signal and said pulsed light brightness signal to obtain an illuminance ratio (A/B) between illuminance (A) of said moving image signal and illuminance (B) of said still image signal;
- and
- image signal processing means for processing said moving image signal and said still image signal derived from said image pickup means based upon said illuminance ratio (A/B) in order to substantially equalize the brightness of the moving image with brightness of the still image.
Dependencies are inferred from the claim text.