Endoscope Image Registration for Accurate Oxygen Saturation Maps
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Solution Overview
Problem
Existing endoscope systems face challenges in generating biological parameter images, such as oxygen saturation images, with high accuracy and robustness due to misregistration issues between spectral images acquired at different wavelengths.
Innovation Solution
An endoscope system that alternately emits monochromatic and polychromatic illumination light beams, using a processor to perform registration processes on monochromatic images based on polychromatic images to align and correct for movement, thereby generating a biological parameter image with higher accuracy and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple monochromatic light beams with different wavelengths are used to acquire spectral images for calculating biological parameters, then the accuracy of biological parameter calculation is improved, but misregistration between images at different wavelengths occurs due to movement, deteriorating the reliability of the calculation
Solution Approach 1:
The patent performs registration processing on monochromatic images using polychromatic images as reference before calculating biological parameters. This preliminary alignment corrects misregistration caused by movement, ensuring that spectral information from different wavelengths corresponds to the same anatomical locations, thereby maintaining both measurement precision and reliability
Solution Approach 2:
The patent introduces polychromatic images as an intermediary reference to register monochromatic images. Since polychromatic images contain broadband information, they serve as a stable reference frame to align multiple monochromatic images taken at different time points, enabling accurate spectral analysis while compensating for movement artifacts
2Reliability
If images are acquired alternately with polychromatic and monochromatic light beams, then misregistration is reduced through synchronized timing, but the complexity of the illumination control system increases
Solution Approach 1:
The patent employs periodic alternation between polychromatic and monochromatic light emission in a cyclic sequence. This periodic illumination pattern enables synchronized acquisition of reference and spectral images at regular intervals, reducing misregistration while maintaining manageable system complexity through rhythmic, predictable control
Solution Approach 2:
The patent combines polychromatic and monochromatic illumination sequences into a unified imaging protocol. By merging the acquisition of reference images (polychromatic) and spectral images (monochromatic) into a single coordinated sequence, the system achieves robust movement compensation without requiring separate independent control systems
Data Source
AI summary
An endoscope system includes a processor, in which the processor generates an aligned first image by performing a registration process on a first endoscope image based on a plurality of second endoscope images, acquires an aligned first image set including a plurality of the aligned first images, calculates oxygen saturation of an observation target based on the acquired aligned monochromic image set, generates a biological parameter image based on the oxygen saturation, and performs control of displaying the biological parameter image on a display.