Motion Sensor Device Alternating Light Sources Background Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional motion sensor devices require capturing extra image frames with the light source turned OFF to remove background light, increasing costs and decreasing performance by necessitating expensive image sensors and longer data transfer times.
Innovation Solution
A motion sensor device that measures distance by capturing two frames with alternating light sources, allowing for background light removal without additional image frames, thereby maintaining performance and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If extra image frames are captured with the light source turned OFF to remove background light, then the background light influence is reduced, but the device cost increases and performance decreases
Solution Approach 1:
The patent applies periodic action by alternately turning ON and OFF multiple light sources at different timings while capturing images. This periodic switching enables the system to distinguish between light from different sources and background light through temporal separation, eliminating the need for extra image frames and expensive specialized sensors while effectively removing background light influence
2Object-affected harmful factors
If extra image frames are captured with the light source turned OFF to remove background light, then the background light influence is reduced, but the data transfer time increases
Solution Approach 1:
The patent uses periodic switching of multiple light sources combined with simultaneous image capture. By assigning different temporal patterns to each light source and using multiple image sensors to capture frames at the same time, the system extracts background light information without requiring sequential extra frames, thereby reducing data transfer time while maintaining background light removal effectiveness
3Object-affected harmful factors
If expensive image sensors are used to capture extra image frames for background light removal, then the background light influence is reduced, but the device cost increases
Solution Approach 1:
The patent segments the light sources into multiple independent units that can be switched ON and OFF at different timings. This segmentation allows the use of standard image sensors to capture spatial and temporal light distribution patterns, enabling background light removal through computational methods rather than requiring expensive specialized sensors
Solution Approach 2:
The patent introduces temporal switching patterns as an intermediary mechanism between the light sources and image sensors. By modulating light sources in time and capturing multiple frames with different light source configurations, the system extracts background light information using standard sensors, avoiding the need for expensive specialized imaging equipment
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 accurate distance measurement with reduced background light influence without the need for extra image frames, enhancing the device's efficiency and cost-effectiveness.
Implementation Method 1
capturing a first image frame with light emitted from a first light source and capturing a second image frame with light emitted from a second light source
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
A motion sensor device according to an embodiment of the present disclosure includes: an image sensor (701); first and second light sources (702, 703); and a controller (710) configured to control the image sensor (701) and the first and second light sources (702, 703). The controller (710) makes the image sensor capture a first frame with light emitted from the first light source at a first time, makes the image sensor capture a second frame with light emitted from the second light source at a second time, performs masking processing on a first image gotten by capturing the first frame and on a second image gotten by capturing the second frame based on a difference between the first and second images, and obtain information about the distance to an object shot in the first and second images based on the first and second images that have been subjected to the masking processing.