3D Head Model Generation Using Longitudinal Axis Reference
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Solution Overview
Problem
Conventional methods for generating three-dimensional head models from a single image often result in distortions, especially when the head is imaged from angles where depth information is unreliable or when the subject wears headgear, leading to poor quality models.
Innovation Solution
A method that uses dimensions and physiognomy ratios from a single distance image to establish a longitudinal axis, allowing for the generation of a three-dimensional head model without distortions, using spatial regions defined from this axis and distance values to create a refined model, which can be improved with additional images from different positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single image is used to generate a three-dimensional head model, then the imaging process is simplified and faster, but distortions occur especially when the head is imaged from angles where depth information is unreliable
Solution Approach 1:
The patent introduces a longitudinal axis as an intermediary reference framework. This axis serves as a mediator between the single two-dimensional image and the three-dimensional model, providing a stable geometric reference that enables accurate depth reconstruction without requiring multiple imaging angles. The axis acts as a computational bridge that transforms limited depth information into reliable three-dimensional coordinates.
Solution Approach 2:
The patent transitions from two-dimensional image data to three-dimensional model construction by introducing a longitudinal axis dimension. This dimensional transformation allows the system to reconstruct depth information along the axis direction, effectively converting limited planar image data into comprehensive spatial coordinates that eliminate distortions while maintaining single-image simplicity.
2Device complexity
If conventional single image methods are used, then the imaging setup is simpler, but poor quality models result when the subject wears headgear or has an unusual face shape
Solution Approach 1:
The patent segments the head model generation process into distinct spatial regions defined by the longitudinal axis. By dividing the three-dimensional space into regions along the axis (such as forehead region, eye region, nose region, mouth region, chin region), the system can independently process and refine each region's geometry. This segmentation allows the method to adapt to various face shapes and headgear configurations without requiring complex imaging setups.
Solution Approach 2:
The patent changes key geometric parameters by establishing the longitudinal axis as the primary reference framework. Instead of relying on fixed camera-angle parameters or template-based measurements, the system dynamically determines axis position and orientation based on detected facial landmarks. This parameter transformation enables the method to accommodate unusual face shapes and headgear while maintaining simple imaging requirements.
3Measurement precision
If the longitudinal axis is positioned too near to or too far from the face, then resolution is lost because spatial regions correspond to different areas on the head surface
Solution Approach 1:
The patent implements feedback mechanisms to optimize longitudinal axis positioning. The system detects facial landmarks (eyes, nose, mouth, chin) and uses their relative positions to calculate the optimal axis location. This feedback loop continuously adjusts the axis position to maintain equidistant spatial regions, ensuring uniform resolution across the entire head surface while avoiding the complexity of manual positioning.
Data Source
AI summary
A method for generating a three-dimensional model of a head including at least a portion of a face, comprising: obtaining a distance image of the head using a distance-measuring device having an imaging position, the distance image comprising for each of a two-dimensional array of distance pixels, a respective distance value indicating a distance from the measuring position to a corresponding point in a field of view of the distance-measuring device, the distance image including a face portion corresponding to the at least a portion of a face; estimating the position, relative to the imaging position, of a longitudinal axis of the model of the head based on the at least one dimension; based on the longitudinal axis, generating the three dimensional model of the head based on the position of the longitudinal axis.