3D Scanning Texture Mapping via Wavelength Synchronization
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Solution Overview
Problem
Existing three-dimensional scanning technologies face high production costs and low texture mapping accuracy due to time and position differences between reconstructed images and texture images, which are often addressed by increasing frame rates or using image estimation methods.
Innovation Solution
Synchronous acquisition and processing of projection patterns and illumination images using different wavelength lights, with the projection pattern and illumination image being synchronized and matched using feature extraction or optical flow tracking algorithms to ensure accurate texture mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acquisition frame rate of the camera is increased to reduce time difference and position difference, then texture mapping accuracy is improved, but production cost increases significantly
Solution Approach 1:
The patent segments the imaging process into multiple wavelength channels (first wavelength for projection pattern, second wavelength for illumination image). By dividing the color camera's color filter array into different wavelength sensitivity regions, each segment captures specific wavelength information simultaneously, eliminating the need for high frame rates while maintaining texture mapping accuracy.
Solution Approach 2:
The patent introduces a wavelength dimension to solve the time-synchronization problem. Instead of capturing images at different times and hoping for alignment, the invention uses spectral separation to capture projection pattern and illumination image simultaneously in the wavelength domain, achieving precise spatial alignment without requiring high temporal resolution.
2Ease of manufacture
If image estimation methods are used to handle time difference and position difference, then production cost is reduced, but texture mapping accuracy deteriorates due to large errors
Solution Approach 1:
The patent introduces wavelength-selective filtering as an intermediary mechanism between the projection pattern and the illumination image. The color filter array acts as a spectral intermediary that separates different wavelength components, allowing simultaneous capture of both images without temporal offset, thereby eliminating the need for error-prone estimation methods.
3Measurement precision
If multiple wavelength lights are used for simultaneous projection, then time difference and position difference are reduced, but device complexity increases
Solution Approach 1:
The patent makes the color camera perform multiple functions simultaneously by utilizing its inherent multi-wavelength sensing capability. The same camera sensor captures both the projection pattern at the first wavelength and the illumination image at the second wavelength, eliminating the need for separate cameras or complex optical switching mechanisms.
Solution Approach 2:
The invention uses the color filter array structure of the camera to create wavelength-specific copies of the imaging function. Different regions of the color filter array act as copies tuned to different wavelengths, allowing simultaneous capture of multiple wavelength images through a single optical path without requiring duplicate hardware systems.
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
This approach reduces time and position differences between three-dimensional reconstruction data and color texture images, enhancing texture mapping accuracy while lowering production costs and minimizing time waste.
Implementation Method 1
a projection device configured to project a pattern of first wavelength light and second wavelength light
Implementation Method 2
an image collection device configured to collect images
Data Source
AI summary
The present disclosure provides three-dimensional scanning image acquisition and processing methods and apparatuses, and a three-dimensional scanning device. The three-dimensional scanning image processing method includes: synchronously acquiring a projection pattern of first wavelength light and an illumination image of second wavelength light projected on a measured object, and acquiring a color texture image projecting the measured object. Through the present disclosure, a problem of texture misalignment caused by the time difference and position difference between the three-dimensional reconstruction data and the color texture image in related art is solved.