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US 7,623,150 B2Granted
Electronic endoscope
AssigneeHoya Corporation
InventorHiroyuki Kobayashi
Life of this patent
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Abstract
Analog pixel signals, which are read out from an image sensor, are subjected to predetermined signal processes, and are converted to digital pixel signals by an A/D converter. The digital pixel signals are separated to RGB signals. The RGB signals are multiplied by a predetermined color matrix coefficient. After that, luminance signals are extracted from the RGB signals. A light adjusting control signal for adjusting the quantity of light is calculated based on the luminance signals. The color matrix coefficient is changed based on the light adjusting control signal.
Claims7
An electronic endoscope comprising:
- a device that carries out photoelectric conversion of an image of an object of view and outputs pixel signals of said object image;
- a converter that converts said pixel signals to color component signals for video signals;
- a color adjuster that adjusts colors of said color component signals by multiplying the color component signals by a predetermined matrix coefficient;
- a light adjusting controller that calculates a luminance of said object image from said color component signals, the colors of which are adjusted, and creates a control signal for adjusting the quantity of illumination light based on said calculated luminance of said object image;
- a color adjusting controller that changes said predetermined matrix coefficient based on said control signal and based on spectral sensitivity characteristics of complementary color filters provided in said device.
2 more elements
Dependencies are inferred from the claim text.