Locus Smoothing Method for Navigation Devices
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Solution Overview
Problem
Conventional locus smoothing methods in navigation devices, such as those using a computer mouse, result in jagged displacement outputs due to the lack of smoothing processing, making precise drawing operations difficult and requiring significant memory resources to achieve better smoothing effects.
Innovation Solution
A locus smoothing method that processes current estimated displacement using a digital filter formed from a predetermined number of previous output smoothed displacements, reducing memory requirements by only recording accumulation values, thereby improving smoothing effectiveness and reducing memory costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional locus smoothing methods use a predetermined number of previous output smoothed displacements, then smoothing effectiveness is improved, but memory requirements increase
Solution Approach 1:
The patent combines multiple previous output smoothed displacements into a single accumulated displacement value. Instead of storing N separate displacement values, the system accumulates them into one value that represents the sum of all previous smoothed displacements, significantly reducing memory requirements while maintaining smoothing effectiveness
Solution Approach 2:
The patent extracts only the essential information needed for smoothing by recording the accumulated displacement value rather than storing complete historical displacement data. This extraction approach keeps only the necessary accumulated value for calculating current smoothed displacement, eliminating redundant storage of individual historical values
2Device complexity
If locus smoothing is not applied to navigation device output, then device complexity is reduced, but the displacement output appears jagged and precision is lost
Solution Approach 1:
The patent applies preliminary smoothing action to the displacement output from the navigation device. By processing the displacement through accumulation and division operations before output, the system eliminates jagged appearance and improves drawing precision while maintaining relatively simple device architecture
Solution Approach 2:
The patent changes the parameter representation of displacement by transforming individual displacement values into accumulated displacement values. This parameter transformation allows the system to achieve smoothing with simple arithmetic operations (accumulation and division) rather than complex filtering algorithms
Data Source
AI summary
A locus smoothing method processes a current estimated displacement according to a predetermined number of previous output smoothed displacements. The locus smoothing method includes the steps of: accumulating a predetermined number of previous output smoothed displacements to produce an accumulated displacement and recording a last output smoothed displacement; estimating a current estimated displacement; forming a digital filter according to the accumulated displacement, the last output smoothed displacement and the current estimated displacement; processing the current estimated displacement with the digital filter to produce a current smoothed displacement; and transmitting the current smoothed displacement to an image display. The present invention further provides a navigation device having smooth locus.