Navigation Device Dynamic Frame Rate Adjustment
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Solution Overview
Problem
Conventional optical mice experience 'runaway' or 'speed break' issues at extremely low speeds due to inadequate frame rate adjustment during acceleration or de-acceleration, leading to poor response times.
Innovation Solution
A navigation device with an image sensor and processor that dynamically adjusts the frame period or rate based on detected acceleration, using a lookup table to set a shorter frame period or rate when acceleration is detected, thereby preventing 'runaway' or 'speed break' scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the image capture frame rate is reduced to lower power consumption at low speeds, then energy efficiency is improved, but the device cannot respond to acceleration or de-acceleration events
Solution Approach 1:
The patent implements dynamic frame rate adjustment where the image capture frame rate is adaptively changed based on detected acceleration or de-acceleration events. The processor monitors motion characteristics and switches between a first frame rate (for normal operation) and a second frame rate (for acceleration/de-acceleration detection), allowing the system to optimize power consumption while maintaining responsiveness to motion changes.
2Use of energy by moving object
If the image capture frame rate is set low for power saving, then energy consumption decreases, but acceleration or de-acceleration detection becomes inaccurate causing runaway or speed break
Solution Approach 1:
The patent employs feedback mechanisms where the processor continuously analyzes image data to detect acceleration or de-acceleration events. When such events are detected, the system provides feedback to adjust the frame rate accordingly, ensuring accurate motion detection while maintaining power efficiency during steady-state operation. The feedback loop compares successive image frames to identify motion changes and triggers frame rate adjustments to prevent runaway or speed break phenomena.
Data Source
AI summary
A navigation device including an image sensor, a processor and a memory is provided. The memory stores a lookup table of a plurality of moving speeds each corresponding to one frame period. The image sensor captures image frames successively. The processor calculates a current speed according to a current image frame and a previous image frame, reads a frame period from the lookup table according to the calculated current speed, wherein the read frame period is multiplied by a ratio, which is smaller than 1, when an acceleration is confirmed by the processor according to the captured image frames.