Dynamic Optical Navigation Sensing Region Adjustment
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Solution Overview
Problem
Conventional optical navigation systems in portable devices face high power consumption due to all sensing units being turned on for detecting image location, leading to inefficient energy use.
Innovation Solution
An optical navigation method and apparatus that dynamically adjusts the size and range of the image sensing array's effective sensing region based on detected moving inertia, such as direction and velocity, to reduce power consumption by only activating necessary sensing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all sensing units in the image sensing array are turned on for detecting image location, then detection accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the sensing region size adjustable rather than fixed. The system dynamically changes the number of active sensing units based on the detected moving inertia of the feature point - using more units when inertia is high (for better detection accuracy) and fewer units when inertia is low (for reduced power consumption). This dynamic adaptation resolves the contradiction between detection accuracy and power consumption.
Solution Approach 2:
The patent changes the parameter of sensing region size based on the moving inertia characteristic. By monitoring the inertia value and adjusting the sensing region accordingly, the system optimizes the balance between detection precision and energy consumption. When inertia indicates significant movement, a larger sensing region is activated; when inertia is minimal, a smaller region suffices, reducing power usage.
2Area of stationary object
If a fixed large sensing region is used for image detection, then detection coverage is improved, but power consumption increases
Solution Approach 1:
The system transitions from a fixed sensing region to a dynamic one that adapts its size based on real-time inertia detection. This allows the sensing area to be minimized while maintaining sufficient coverage for the current detection needs, thereby reducing power consumption without sacrificing necessary detection capability.
Solution Approach 2:
Instead of always activating the full sensing array (excessive action), the system activates only the necessary portion of the sensing region based on the detected inertia. This partial action approach ensures sufficient detection coverage for the current situation while avoiding the waste of energy associated with activating the entire array when a smaller region would suffice.
Data Source
AI summary
An optical navigation method includes: detecting inertia of an image of a feature point; and determining an effective sensing region of an image sensing array according to the detected inertia for reducing power consumption. Besides, an optical navigation apparatus includes a detecting circuit and a determining unit. The detecting circuit is arranged for detecting a moving inertia of a feature point. The determining circuit is coupled to the detecting circuit, and arranged for determining an effective sensing region of an image sensing array according to the detected moving inertia for reducing power consumption.