Proposal on 3-D endoscope by using grid-based active stereo.

Area of Science:

• Medical Imaging
• Computer Vision
• Optical Engineering

Background:

• Accurate 3-D shape acquisition is crucial for minimally invasive surgery and diagnostics.
• Existing endoscopic systems often lack high-precision 3-D reconstruction capabilities.

Purpose of the Study:

• To develop and evaluate a novel 3-D endoscope system for precise surface shape measurement.
• To assess the system's accuracy and feasibility for reconstructing complex biological surfaces.

Main Methods:

• A novel 3-D endoscope system employing grid-based active stereo.
• Projection of a waved-grid pattern with sinusoidal lines for sub-pixel accuracy.
• Development of a compact pattern projector integrated into a standard endoscope.

Main Results:

• Accurate 3-D shape acquisition with sub-pixel precision was achieved.
• Measurements of a hexagonal cylinder showed length error < 0.9% and angle error < 2.2%.
• Successful 3-D shape reconstruction of animal organ surfaces was demonstrated.

Conclusions:

• The proposed 3-D endoscope system offers high accuracy for 3-D shape measurement.
• The system is suitable for reconstructing complex surfaces, including biological tissues.
• This technology has potential applications in medical diagnostics and surgical guidance.