Optical Sensor Calibration for False Motion Alarm Reduction

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Solution Overview

Problem

Conventional optical sensors frequently generate false motion alarms due to background motions, leading to unnecessary power consumption as backend monitoring systems wake up for video recording operations.

Innovation Solution

An optical sensor device with a calibration mode that defines a masking region to distinguish between background and foreground motions, selectively ignoring background motions and generating true motion alarms only, thereby reducing false alarms and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional optical sensor monitors all regions in monitoring frames, then motion detection coverage is complete, but false motion alarms increase due to background motions

Engineering Contradiction:

Improvemotion detection accuracyVSAvoidfalse motion alarms

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent divides the monitoring frame into multiple regions of interest (ROIs), each independently monitored for motion detection. This segmentation allows the system to focus computational resources on specific areas while ignoring background motions in other regions, thereby reducing false alarms while maintaining detection accuracy in critical zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different motion detection sensitivities and parameters to different regions of the monitoring frame. By adjusting local detection thresholds and ROI definitions for each region, the system optimizes detection accuracy for specific areas while tolerating background motions in others, effectively reducing false alarms without compromising overall reliability.

Inventive Principle:

Principle #3Local quality

2Speed

If backend monitoring system wakes up frequently for video recording, then motion monitoring responsiveness is high, but power consumption increases

Engineering Contradiction:

Improvemotion monitoring responsivenessVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent performs preliminary motion analysis within regions of interest before triggering full video recording operations. By pre-processing and filtering motions in specific ROIs, the system can determine whether wake-up is necessary, reducing unnecessary power consumption while maintaining responsive monitoring of critical areas.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements partial monitoring by focusing computational and power resources on specific regions of interest rather than the entire monitoring frame. This selective approach allows the system to maintain high responsiveness in critical zones while consuming less power overall by ignoring or using reduced monitoring in other areas.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11871157B2Optical sensor device and calibration method capable of avoiding false motion alarm

Publication Date: 2024.01.09 PIXART IMAGING INC

AI summary

A method of an optical sensor device includes: automatically entering a calibration mode to automatically define a region of interest as a masking region; and, selectively ignoring a motion detected within the masking region when the optical sensor device is in a normal operation mode.