Dental Model Color Transfer via Non-Rigid Alignment
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Solution Overview
Problem
Current methods for rendering digital 3D dental models lack photorealistic color transfer between differently shaped models, resulting in unsatisfactory visualization, especially when color information is not captured during scanning or is fixed and non-photorealistic.
Innovation Solution
A computer-implemented method for transferring color information from a reference dental model to a primary dental model using non-rigid alignment and look-up tables, employing algorithms like Iterative Closest Point (ICP) and nearest-neighbour search, to align and match the geometry and assign properties such as color to vertices of the primary model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If fixed or pre-set color is applied to 3D dental models, then the coloring process is simplified and can be done automatically, but the visualization quality becomes unrealistic and unsatisfactory
Solution Approach 1:
The patent captures actual color information from a reference dental model (either through scanning or photography) and copies it to the target 3D model. This allows automatic color application while maintaining photorealistic quality by using real color data from the actual dental situation rather than fixed pre-sets.
Solution Approach 2:
The patent transforms color information from the reference model into a format suitable for the target model by establishing correspondence between their vertices through alignment algorithms. This parameter transformation enables the transfer of realistic color data while adapting it to the different geometry of the target model.
2Manufacturing precision
If color information is captured during scanning, then photorealistic visualization is achieved, but the scanning process becomes more complex and requires specialized equipment
Solution Approach 1:
The patent makes the color capture process universal by accepting multiple input sources: either color information captured during scanning with specialized equipment, or photographs taken with standard cameras. This multi-functionality allows photorealistic colorization without requiring all users to have complex scanning equipment.
Solution Approach 2:
The patent uses an intermediary reference model that can be created from either scan data or photographs. This intermediary serves as a bridge between different input methods and the final target model, allowing color information from simple photographs to be transferred to 3D models with the same photorealistic quality as scan-based approaches.
3Manufacturing precision
If manual colorization by skilled artists is used, then photorealistic visualization is achieved, but the process becomes lengthy and costly
Solution Approach 1:
The patent automatically copies color information from the reference model to the target model using vertex correspondence established through alignment algorithms. This automated copying process achieves photorealistic colorization quality without requiring manual artist intervention, reducing time from hours/days to minutes.
Solution Approach 2:
The system performs self-service colorization by automatically capturing color data, aligning models, establishing vertex correspondence, and transferring colors without human intervention. This eliminates the need for skilled artists while maintaining high photorealistic quality.
4Adaptability or versatility
If color is transferred between differently shaped models, then versatility is improved and different geometries can be colored, but the alignment accuracy becomes more difficult to achieve
Solution Approach 1:
The patent segments the color transfer process into distinct steps: rigid alignment to establish overall positioning, non-rigid alignment to adapt to shape differences, and vertex correspondence establishment. This segmentation allows accurate color transfer between differently shaped models by handling each aspect separately with appropriate algorithms.
Solution Approach 2:
The patent uses dynamic alignment approaches that can adapt to different geometries. The non-rigid alignment step allows the transformation to be flexible and adaptive, adjusting to shape differences between reference and target models while maintaining vertex correspondence accuracy for color transfer.
Data Source
AI summary
The invention pertains to a method for transferring properties from a reference dental model (20) to a primary dental model (10), wherein the method comprises a non-rigid alignment of the primary dental model and the reference dental model, comprising applying an algorithm to minimize a measure of shape deviation between the primary dental model and the reference dental model, and transferring properties of the reference dental model to the primary dental model.