Four-Sensor Gesture Direction Recognition Under Noise and Output Drift
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Solution Overview
Problem
Conventional gesture recognition systems using infrared sensors are prone to inaccuracies due to output deviations and external noise, leading to errors in determining the moving direction of a user's hand.
Innovation Solution
An apparatus and method that utilize four sensors aligned in a diamond shape to identify intersecting points and calculate an accumulated sum based on output values, applying weights to improve accuracy and resist noise, allowing for precise determination of gesture direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If difference values between sensor output values are used to determine moving direction, then the determination process is simple, but accuracy is reduced due to output deviation and external noise
Solution Approach 1:
The patent applies preliminary action by calculating accumulated sum values before final determination. The controller computes accumulated sums from sensor output values in advance, then uses these pre-calculated values along with intersection point counts to determine moving direction. This preliminary calculation step prepares refined data that reduces the impact of output deviations and external noise, improving accuracy without significantly increasing process complexity.
2Measurement precision
If accumulated sum calculation is performed to improve accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the determination process into distinct stages: first counting intersection points to identify potential moving directions, then calculating accumulated sum values for those directions, and finally determining the actual moving direction based on both pieces of information. This segmented approach breaks down the complex calculation into manageable steps, improving accuracy while keeping processing complexity controlled through systematic organization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of gesture recognition by minimizing the impact of output deviations and external noise, enabling quick and reliable determination of gesture direction without the need for additional storage.
Implementation Method 1
Light emitted from the light emitting diode (LED) 11 is reflected as it collides with a palm that moves thereon. The reflected light is delivered to a photo sensor unit 12 via a lens 13.
Implementation Method 2
a photo sensor unit 12 including four unit photo sensors is provided. Light emitted from the light emitting diode (LED) 11 is reflected as it collides with a palm that moves thereon. The reflected light is delivered to a photo sensor unit 12
Data Source
AI summary
An apparatus and method to recognize a moving direction of gesture are provided. A final moving direction of gesture is determined using the number of intersecting points based on output values from one or more sensors disposed in up, down, left, right directions and a code of an accumulated sum. Thus, a moving direction of target (hand) that moves on the sensors is recognized more accurately. The apparatus to recognize a moving direction of a gesture includes first to fourth sensor disposed at a position that is north, south, west, and east from a center; and a controller configured to identify a number of intersecting points based on output values of the first sensor, the second sensor, the third sensor and the fourth sensor and to estimate a moving direction of the gesture according to the number of the intersecting points.