Endoscope Light Source Controller for Xenon Hue Matching
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Solution Overview
Problem
Endoscope systems using polychromatic light from semiconductor sources struggle to replicate the image hue achieved with continuous spectrum light from xenon lamps, making it difficult to maintain consistency in medical imaging and comparison across different lighting conditions.
Innovation Solution
An endoscope system with a light source controller that adjusts the intensity ratio of multiple color LEDs to match the emission spectrum of continuous spectrum light, using a combination of violet, blue, green, and red LEDs to generate a polychromatic light that mimics the hue of xenon lamp illumination, ensuring equal integrated emission intensities across different color pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polychromatic light from semiconductor light sources is used for illumination, then the light sources can be controlled discretely to adjust the emission spectrum, but the image hue differs from that obtained with continuous spectrum light from xenon lamps
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the intensity ratios of multiple semiconductor light sources (violet, blue, green, red LEDs) to match the spectral characteristics of xenon lamp continuous spectrum light. The light source controller modifies emission parameters in real-time to achieve both adaptability and consistent image hue.
Solution Approach 2:
The patent uses composite light sources by combining multiple semiconductor light sources of different colors (violet, blue, green, red LEDs) to create a polychromatic light output that mimics the continuous spectrum of xenon lamps, achieving both control flexibility and spectral fidelity.
2Adaptability or versatility
If multiple semiconductor light sources are combined to generate polychromatic light, then the emission spectrum can be adjusted for different object types, but the integrated emission intensity ratio among color pixels cannot be made equal to that of continuous spectrum light
Solution Approach 1:
The patent implements feedback control where the light source controller receives detection results of emission intensities from color pixels and adjusts the driving conditions of semiconductor light sources accordingly. This closed-loop system ensures the integrated emission intensity ratios among color pixels match those of continuous spectrum light while maintaining spectral adjustability for different object types.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves an acceptable image hue with polychromatic light, allowing for consistent imaging that mimics the appearance of continuous spectrum light, facilitating comparison and diagnosis while improving whiteness and color rendering.
Implementation Method 1
use of semiconductor light sources, such as LEDs (light emitting diodes), has been developed instead of the xenon lamp as a broadband light source. For example, blue, green and red LEDs and the like are combined for emitting light of different colors
Implementation Method 2
A light guide device for transmitting light for illumination has a transmission characteristic with a difference between a plurality of endoscope types
Data Source
AI summary
An endoscope system includes a color image sensor, having pixels sensitive to plural colors different from one another, for imaging an object. Plural LEDs discretely generate light of colors different from one another, to apply polychromatic light constituted by spectrally combining the light of the colors to the object. A light source controller controls the plural LEDs, to correct an intensity ratio of an integrated emission intensity between the plural colors according to receiving the first polychromatic light with respectively the pixels of the plural colors, so that the intensity ratio becomes equal to a target ratio of an integrated emission intensity between the plural colors according to receiving continuous spectrum light with respectively the pixels of the plural colors, the continuous spectrum light having an at least partial wavelength range of light emitted by a white light source.