3D Measurement Dot Pattern Layout for Accurate Parallax Matching
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Solution Overview
Problem
Existing three-dimensional measurement devices face challenges in accurately specifying corresponding parts between captured images due to the use of random dot patterns, leading to inaccurate parallax information calculation, especially on flat or low-contrast surfaces.
Innovation Solution
A three-dimensional measurement device employing a Poisson disk sampling algorithm to generate dot patterns by determining a reference position, selecting arrangement patterns, and iteratively arranging dots to avoid overlap, combined with projection and image capture from two directions to calculate parallax information accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a random dot pattern is used for projection light, then the corresponding part can be specified using light and darkness patterns, but similar dot patterns may locally appear causing inaccurate corresponding part specification and parallax information calculation
Solution Approach 1:
The patent changes the fundamental parameter of dot pattern generation from random distribution to Poisson disk sampling algorithm. This algorithmic change ensures that dots are distributed uniformly with minimum separation distance, eliminating the local similarity problem while maintaining ease of generation through a standardized algorithmic process.
2Device complexity
If conventional triangulation method is used without projection light, then the measurement process is simpler, but corresponding parts cannot be accurately specified on flat portions or portions with little color change
Solution Approach 1:
The patent applies local quality by projecting dot patterns specifically on the object surface to create unique local features. The dot pattern provides localized visual markers that enable accurate corresponding part specification on flat or low-contrast surfaces without complicating the overall measurement process.
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
Enables high-accuracy three-dimensional measurement by reducing noise in parallax images and improving the accuracy of specifying corresponding parts between captured images.
Implementation Method 1
a dot pattern projection control unit that controls a projection device to project projection light including the dot pattern onto the object
Implementation Method 2
a captured image acquisition unit that controls an image capturing device to image-capture the object onto which the projection light is projected from two directions to acquire two captured images
Implementation Method 3
a parallax information calculation unit that calculates parallax information about the acquired two captured images
Data Source
AI summary
To perform three-dimensional measurement of an object with high accuracy, a dot pattern is generated by a determination process of determining a reference position according to a rule defined by a Poisson disk sampling algorithm, a selection process of selecting one of a plurality of arrangement patterns indicating at least one or more dot arrangements, an arrangement process of arranging dots based on the arrangement pattern selected for the reference position, and an iterative process of performing the above processes a plurality of times, a projection device is controlled to project projection light including the dot pattern onto the object, an image capturing device is controlled to image-capture the object onto which the projection light is projected from two directions to acquire two captured images, parallax information is calculated about the acquire two captured images, and a three-dimensional shape of the object is specified based on the calculated parallax information.