Endoscope Video Processor Dynamic Matrix Coefficients for NBI Contrast
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Solution Overview
Problem
Conventional endoscope apparatuses face challenges in effectively switching between normal white light imaging (WLI) and narrow band imaging (NBI) modes, particularly in maintaining high-resolution image quality and preventing contrast deterioration during capillary vessel observation.
Innovation Solution
The endoscope apparatus incorporates a light source device with a narrow band filter and a video processor that dynamically adjusts signal processing characteristics, including matrix coefficients and low-pass filter settings, based on signal intensity ratios to convert luminance and color difference signals into primary color signals, optimizing image processing for both WLI and NBI modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional Y/C separation circuit is used to process luminance and color signals, then the device structure is simple, but the image quality deteriorates when switching between WLI and NBI modes
Solution Approach 1:
The patent implements dynamic switching between different signal processing paths based on the imaging mode. A mode selection circuit dynamically connects either the conventional Y/C separation circuit (for WLI) or the new color separation circuit (for NBI), allowing the system to adapt its processing characteristics to the specific imaging requirements of each mode while maintaining overall system simplicity.
Solution Approach 2:
The patent changes the signal processing parameters (color separation matrix coefficients) based on the imaging mode. By switching between different matrix circuits with optimized coefficients for WLI and NBI respectively, the system achieves high image quality for both modes without requiring a completely different processing architecture for each mode.
2Measurement precision
If narrow band imaging mode is used to observe capillary vessels, then the resolution is improved, but the contrast deteriorates
Solution Approach 1:
The patent applies different color separation matrix coefficients specifically optimized for NBI mode to process the luminance and color difference signals. This local optimization of processing parameters for the specific NBI imaging characteristics enables enhanced capillary vessel resolution while maintaining adequate contrast through mode-specific signal processing.
3Measurement precision
If frame-sequential illuminating light is used for NBI, then the capillary vessel visibility is improved, but the frame rate is reduced
Solution Approach 1:
The patent creates a universal signal processing system that can handle both WLI and NBI modes through a single integrated architecture. The mode selection circuit and switchable matrix circuits allow the same hardware to process both wideband and narrowband imaging signals, enabling the system to provide enhanced capillary visibility in NBI mode without requiring separate dedicated processing paths that would complicate the system.
Data Source
AI summary
In an endoscope apparatus, a first color separation section separates an image picked up by an image pickup section into a first luminance signal and a first color difference signal, then a first color conversion section and a second color separation section convert the first luminance signal and the first color difference signal to first three primary color signals and second three primary color signals respectively, a signal intensity ratio calculation circuit calculates a signal intensity ratio among the first three primary color signals, matrix coefficients of the second color separation section are changed based on the calculated signal intensity ratio and the second color separation section converts the first luminance signal and the second color difference signal to the second three primary color signals.