Motion Detection Flicker Compensation via Dual-Resolution Imaging
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Solution Overview
Problem
Conventional motion detection systems suffer from false alarms due to flicker banding artifacts, which are incorrectly detected as object motion, especially in environments with artificial lighting, leading to increased power consumption and reduced detection sensitivity.
Innovation Solution
A low-power motion detection system with flicker compensation that captures a high-resolution image for motion detection and a lower-resolution image for flicker detection, using a controller to update the image sensor's wakeup cycle based on a time offset generated from flicker phase information, minimizing power consumption and maintaining detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image sensor operates continuously in high-resolution mode for motion detection, then motion detection sensitivity is improved, but power consumption increases
Solution Approach 1:
The image sensor alternates between high-resolution mode for motion detection and low-resolution mode for flicker detection, operating in periodic cycles. This allows the sensor to maintain motion detection sensitivity when needed while reducing power consumption during flicker detection periods, resolving the contradiction between continuous high-resolution operation and power savings
Solution Approach 2:
The detection function is segmented into two separate image capture modes: high-resolution images for motion detection and low-resolution images for flicker detection. This segmentation allows each mode to operate independently at appropriate resolution levels, optimizing both detection sensitivity and power consumption
2Measurement precision
If multiple images are captured for flicker detection before continuous shooting, then flicker detection accuracy is improved, but detection time delay increases
Solution Approach 1:
The system captures multiple low-resolution images in advance for flicker detection before initiating continuous high-resolution shooting. This preliminary action establishes the flicker detection baseline early, allowing accurate flicker compensation during subsequent motion detection without causing time delays in the main detection workflow
3Reliability
If adaptive motion detection threshold is used for flicker compensation, then false alarm rate is reduced, but detection sensitivity decreases
Solution Approach 1:
The system extracts flicker characteristics from low-resolution images separately from motion detection. By isolating flicker detection into a dedicated low-resolution imaging channel, the motion detection threshold can remain sensitive without being contaminated by flicker artifacts, thus reducing false alarms while preserving detection sensitivity
4Use of energy by moving object
If lower resolution image is used to reduce power consumption, then power consumption is reduced, but flicker detection accuracy deteriorates
Solution Approach 1:
The system applies different quality levels to different detection tasks: low-resolution imaging is sufficient for flicker detection where only temporal intensity variations matter, while high-resolution imaging is used for motion detection. This local quality assignment reduces overall power consumption while maintaining adequate flicker detection accuracy
Data Source
AI summary
A motion detection system with flicker compensation includes an image sensor that captures a first image for motion detection and a second image for flicker detection, the second image having a resolution lower than the first image; a controller that controls the image sensor to output either the first image or the second image; a motion detection device that receives first images and performs motion detection on the first images; and a flicker detection device that receives second images and performs flicker detection on the second images to generate a time offset, which is fed to the controller to update a wakeup cycle for coordinating the image sensor.