Gesture Detection in Image Projection Devices
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Solution Overview
Problem
Existing image projection devices face challenges in detecting and responding to operator gestures due to wide detection ranges and low sensitivity, leading to difficulties in controlling or operating projected images with high responsiveness and usability.
Innovation Solution
The implementation of an image projection device that adjusts its detection range based on the projection direction, using a sensor system that includes a temperature sensor to detect hand movements and control sensitivity, allowing for precise gesture detection even when the operator's body becomes part of the background, and differentiating between gestures that control the image and those that do not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection range is widened to cover the projection area, then the ability to detect persons in the projection area is improved, but the sensitivity to detect gestures is reduced
Solution Approach 1:
The detection area is divided into multiple regions with different detection sensitivities. The system segments the projection area into a first detection area with high sensitivity for gestures and a second detection area with lower sensitivity for general person detection, allowing both functions to coexist without interfering with each other.
Solution Approach 2:
Different regions of the detection area are assigned different detection characteristics. The first detection area has enhanced sensitivity specifically for detecting hand gestures, while the second detection area maintains broader coverage for person detection, creating local quality variations in the detection system.
2Speed
If the detection sensitivity is increased to detect gestures, then the responsiveness to gesture control is improved, but false detection of background temperature variations occurs
Solution Approach 1:
The system extracts and focuses detection on specific regions of interest (the first detection area) where gestures are expected to occur, rather than uniformly across the entire projection area. This extraction allows high sensitivity detection in the relevant region while ignoring irrelevant temperature variations in the background.
Solution Approach 2:
The control unit acts as an intermediary that processes detection signals and determines whether detected temperature changes correspond to valid gestures or false detections. It mediates between the high-sensitivity detection and the need to filter out false positives from background temperature variations.
3Adaptability or versatility
If the detection range is set to match the projection area, then the coverage of gesture control is improved, but the ability to distinguish gestures from background is reduced
Solution Approach 1:
The detection area is segmented into a first detection area within the projection area where gestures are detected with high sensitivity, and a second detection area where general person detection occurs. This segmentation allows the system to maintain broad coverage while improving discrimination precision in the relevant gesture detection zone.
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
This solution enhances the responsiveness and usability of image projection devices by improving gesture detection accuracy and preventing false triggers, allowing operators to control projected images with greater precision and ease.
Implementation Method 1
a temperature sensor to detect a moving direction of a human hand as a gesture, wherein background temperature is detected by the temperature sensor
Data Source
AI summary
In an image projection device in which a projected image can be controlled or operated by gesture, the responsiveness (operability) and/or the usability are improved. The image projection device includes a sensor element to detect a gesture and a control section to generated an operation signal to control (for example, to scroll images or to feed image frames) a projected image projected according to a gesture detected by the sensor element, wherein the control section generates the operation signal when the sensor element detects a gesture in a first direction parallel to the projection surface of the projected image, and when the sensor element detects a gesture in a second direction perpendicular to the projection surface, the control section suspends generation of the operation signal.