Gesture Detection via Velocity Variation Analysis

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Solution Overview

Problem

Optical image sensors often misinterpret gestures, particularly the pinch-out action used for zooming, as they generate undesired commands when the user closes their fingers to prepare for the next gesture, leading to misjudgment and incorrect output.

Innovation Solution

A method and apparatus that determine gestures based on variations in velocity, distinguishing between commanding gestures and restoration actions by analyzing the relative velocities of image size or brightness changes over time, ensuring accurate command output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If optical image sensor detects gesture by image size change, then gesture detection capability is provided, but misjudgment occurs when user closes fingers to prepare for next gesture

Engineering Contradiction:

Improvegesture detection capabilityVSAvoidgesture recognition accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the detection parameter from static image size to dynamic velocity of image size change. By calculating the velocity of image size variation between sequential frames, the system can distinguish between intentional gestures (with specific velocity patterns) and preparatory movements (with different velocity characteristics), thereby resolving the misjudgment problem while maintaining gesture detection capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback by continuously monitoring the velocity of image size changes and using this information to adjust gesture recognition decisions. The system compares the calculated velocity against threshold values and uses the velocity pattern (increasing or decreasing) to determine whether to recognize a gesture, providing a feedback mechanism that prevents misjudgment of preparatory actions as intentional gestures

Inventive Principle:

Principle #23Feedback

2Productivity

If image sensor outputs command for each finger movement, then responsive control is achieved, but multiple undesired commands are generated from single intended gesture

Engineering Contradiction:

Improveresponse speedVSAvoidcommand accuracy

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent applies dynamics by transitioning from static gesture detection to dynamic velocity-based detection. By analyzing the rate of change of image size over time, the system can identify the characteristic velocity pattern of intentional gestures versus preparatory movements, enabling accurate single-command output while maintaining rapid response to user intentions

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9529521B2Gesture detecting apparatus and method for determining gesture according to variation of velocity

Publication Date: 2016.12.27 PIXART IMAGING INC

AI summary

The present invention discloses a gesture detecting apparatus which includes an image capturing device and a processing unit. The image capturing device is for capturing an object light beam reflected by an object and outputting corresponding image information accordingly. The processing unit is for processing the image information and generating a first command or a second command accordingly. The steps of generating the first command and the second command by the processing unit include: outputting a first command if an image size of the image information increases with a relatively higher velocity and decreases with a relatively lower velocity in a sequential time series; and outputting a second command if the image size of the image information increases with a relatively lower velocity and decreases with a relatively higher velocity in the sequential time series.