Scanning Optical Positioning System with Triangulating Receivers

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Camera-based motion tracking systems in 3D technology face limitations due to frame rate constraints, leading to artifacts like blurring and high data volumes, resulting in delayed reaction times in virtual environments.

Innovation Solution

A light projection system employing a pixel trajectory time map to determine the positioning of a remote sensor by scanning a spot across a remote surface, allowing for precise alignment and accurate motion detection using transition times and observation angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If camera-based motion tracking systems are used to capture multiple images, then motion detection capability is provided, but frame rate limitations cause blurring artifacts and reduced measurement precision

Engineering Contradiction:
Improvemotion detection accuracyVSAvoidframe rate
Core Design Contradiction:
Measurement precisionVSSpeed

Solution Approach 1:

The patent replaces the mechanical camera imaging system with an optical scanning system that uses a moving light source and photodetector array. Instead of capturing multiple static images and processing them to detect motion, the system scans a laser beam across the scene and detects the reflected light at each spatial position, enabling direct measurement of motion without frame rate limitations causing blurring.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system employs periodic scanning of a laser beam across the field of view in a systematic pattern. By scanning through multiple spatial positions sequentially and recording the time of flight or phase information at each position, the system achieves high-speed motion detection without the blurring artifacts inherent in camera-based systems that must capture entire frames at discrete time intervals.

Inventive Principle:
Principle #19Periodic action

2Measurement precision

If multiple images are captured for motion tracking, then motion detection is enabled, but data volume increases causing latency and reduced productivity

Engineering Contradiction:
Improvemotion detection capabilityVSAvoidreaction time
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent extracts only the essential information needed for motion detection - the time of flight or phase shift at each scanned position - rather than capturing and processing entire image frames. This selective extraction of critical data points (spatial coordinates and temporal information) dramatically reduces the data volume while maintaining motion detection capability, thereby reducing processing latency and improving system productivity.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The system segments the field of view into multiple discrete spatial positions that are scanned sequentially. Instead of processing a complete image containing all pixels simultaneously, the system processes information at individual scanned positions independently, which reduces the computational burden and data handling requirements while still enabling comprehensive motion detection across the entire field of view.

Inventive Principle:
Principle #1Segmentation

3Measurement precision

If camera-based systems capture motion data, then motion tracking is provided, but processing requirements increase due to high data volumes

Engineering Contradiction:
Improvemotion tracking accuracyVSAvoidprocessing requirements
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex image processing algorithms with simpler optical measurement principles. Instead of capturing full images and using complex computer vision algorithms to track motion, the system uses time of flight measurement or phase shift detection at scanned positions, which are physically simpler measurements that require less computational processing while achieving comparable or superior motion tracking accuracy.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system creates a simplified representation of the scene by scanning a laser beam through known spatial positions and recording temporal information (time of flight or phase). This creates a set of discrete, easily processable measurements that can be directly converted to motion data without requiring complex image processing, thereby reducing processing requirements while maintaining measurement precision.

Inventive Principle:
Principle #26Copying

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 enables accurate and responsive motion detection with minimal latency, improving interaction with virtual environments by reducing data volume and processing requirements, thus enhancing motion capture accuracy and scalability.

Implementation Method 1

A light projection system may scan a light beam across a surface

Methodology Applied
Scientific EffectLight: Light

Implementation Method 2

A position sensing device may be arranged to observe three or more spots on a remote surface

Methodology Applied
Scientific EffectReflection: Reflection

Data Source

PatentUS8711370B1Scanning optical positioning system with spatially triangulating receivers
Publication Date: 2014.04.29 SMITS GERARD DIRK
  • US8711370B1 patent drawing
  • US8711370B1 patent drawing
  • US8711370B1 patent drawing

AI summary

Embodiments are directed towards detecting the three dimensional position of a position sensing device (PSD) utilizing a spot scanned across a remote surface. A trajectory map may be determined for a projection system. The trajectory map may identify a location of the spot at various times during the scan. A PSD may be arranged with a clear view of the remote surface. The PSD may observe at least three spots projected onto the remote surface utilizing three lines of sight that enable moment-in-time linear alignment between the spot and a sensor. Observation angles between each of the lines of sight may be determined. For each observed spot, a transition time may be determined and a location of the observed spot may be determined based on the trajectory map. A position of the PSD may be determined based on determined observed locations and the observation angles of the PSD.