Single Sensor Motion Detection via Temporal Segmentation
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Solution Overview
Problem
Current motion detection devices require multiple sensors to detect horizontal motion, which is inefficient and costly, and are not effective in detecting angled or vertical motions.
Innovation Solution
A single sensor device that uses a time-of-flight or ambient radiation sensor to detect horizontal motion by analyzing the average distance and intensity of reflected signals within a detection cone, allowing for the differentiation of motion types based on the position of the maximum signal intensity during a detection time period, and is capable of detecting motions independent of its rotation and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to detect horizontal motion, then motion detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the hand into multiple portions (first portion with remote projection, second portion with closest projection) and detects them sequentially as they enter/leave the detection cone. This temporal segmentation allows a single sensor to distinguish motion directions by recording which portion is detected first, eliminating the need for multiple sensors while maintaining detection accuracy.
Solution Approach 2:
The patent transitions from spatial detection (multiple sensors positioned at different locations) to temporal detection (single sensor detecting portions of hand at different times). By adding the time dimension to detection, the system achieves motion direction discrimination without requiring additional spatial sensors.
2Adaptability or versatility
If traditional motion detection devices are used, then horizontal motion can be detected, but angled and vertical motions cannot be detected
Solution Approach 1:
The patent makes the single sensor system universal by enabling it to detect multiple motion types (horizontal, angled, vertical) through a single detection cone. The system determines motion type by analyzing which hand portions are detected and their temporal sequence, allowing one sensor to perform the function previously requiring multiple specialized sensors.
Solution Approach 2:
The patent changes the detection parameter from absolute distance measurements to relative temporal ordering of portion detection. By analyzing whether the first or second hand portion enters the detection cone first, the system can determine motion direction and type without changing the physical sensor orientation, making it adaptable to various motion patterns.
3Ease of operation
If sensor orientation is fixed, then detection is simple, but motion detection becomes dependent on sensor rotation
Solution Approach 1:
The system performs self-orientation by automatically determining motion direction based on the temporal sequence of hand portion detection. The sensor doesn't need external orientation references or complex calibration; the detection pattern itself reveals the motion direction, making the system self-sufficient regarding orientation information.
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 efficient detection of horizontal and vertical motions using a single sensor, reducing costs and space requirements, and is independent of sensor orientation, allowing for accurate determination of motion types without relying on absolute distances.
Implementation Method 1
the sensor emits a signal capable of reflecting on the hand
Implementation Method 2
the sensor is a time-of flight sensor
Data Source
AI summary
A method includes emitting, by a single sensor of a device, a signal into a region; receiving, by the single sensor, a reflected signal; and detecting motion in a detection cone comprising a central axis based on the reflected signal, wherein detecting motion comprises detecting a first type of motion from a first position to a second position, and detecting a second type of motion from the second position to the first position.