Electronic endoscope
First Claim
Patent Images
1. 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.
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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.
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Citations
7 Claims
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1. An electronic endoscope comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification