Motion Estimation Device Light Source Emission Cycle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motion estimation devices, such as optical mice, face challenges in power consumption due to fluctuating image brightness and increased signal processing load when adjusting image capture frame rates and illuminating rates based on velocity, leading to instability and complex product design across different products.
Innovation Solution
A power saving method that dynamically adjusts the emitting cycle of the light source based on displacement, with a fixed sampling period and integral multiple emitting cycles, allowing for stable image capture and reduced processing load, adaptable to both high-end and low-end products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the image capture frame rate is adjusted according to moving speed, then power consumption is reduced, but image brightness fluctuation increases and stability decreases
Solution Approach 1:
The patent applies periodic action by adjusting the light source emitting cycle based on displacement thresholds. Instead of continuously varying the frame rate with velocity, the system uses discrete periodic illumination cycles that are extended or shortened based on whether displacement exceeds a threshold, thereby reducing power consumption while maintaining stable image brightness during each illumination period.
Solution Approach 2:
The patent changes the parameter of light source emitting cycle duration based on displacement magnitude. When displacement exceeds a threshold, the emitting cycle is extended to ensure adequate illumination; when displacement is small, the emitting cycle is shortened to save power. This dynamic parameter adjustment resolves the contradiction between power saving and brightness stability.
2Use of energy by moving object
If the image capture frame rate is decreased with decreasing moving speed, then power consumption is reduced, but the sensing area must be increased to maintain maximum detectable acceleration
Solution Approach 1:
The patent applies dynamics by making the light source emitting cycle adaptive rather than fixed. The emitting cycle dynamically adjusts based on real-time displacement measurements, allowing the system to maintain adequate illumination for detection while reducing the sensing area requirement compared to static high-frame-rate approaches.
3Use of energy by moving object
If the illuminating rate of the light source is changed according to velocity, then power consumption is reduced, but signal processing load increases due to additional velocity calculation
Solution Approach 1:
The patent extracts the velocity calculation step from the control loop and replaces it with direct displacement threshold comparison. Instead of calculating velocity from multiple frame comparisons, the system directly compares displacement magnitude against a threshold to determine emitting cycle duration, thereby reducing signal processing load while achieving similar power savings.
4Use of energy by moving object
If different velocity thresholds are designed for high-end and low-end products, then power saving is optimized for each product tier, but product design complexity increases
Solution Approach 1:
The patent applies universality by designing a single displacement threshold mechanism that can be applied across all product tiers. Instead of implementing separate velocity threshold tables for high-end and low-end products, the system uses a universal displacement-based control logic that adapts to different product capabilities through a single configurable parameter, thereby reducing product design complexity while maintaining power saving optimization.
Data Source
AI summary
A power saving method for a motion estimation device includes: calculating a first differential image at a first time; calculating a second differential image at a second time; comparing the first differential image and the second differential image to obtain a displacement between the first differential image and the second differential image; comparing the displacement with at least one threshold value; and adjusting an emitting cycle of a light source according to a comparison result of comparing the displacement and the threshold value and maintaining a sampling period of the motion estimation device unchanged when adjusting the emitting cycle of the light source. The present invention further provides a motion estimation device.