Image Projection Device with Focus-Based Touch Operation Detection
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Solution Overview
Problem
Existing techniques for detecting touch operations on projected images struggle to accurately distinguish between different types of operations, such as double-tap and constant touch, due to difficulties in determining the presence and position of a finger or pointer on a projection screen.
Innovation Solution
An image projection device is designed with a projection unit, an imaging unit capable of focusing, and processing units to extract and analyze image data, allowing for the correct identification of touch operations by generating reference data and determining the position and operation type of a finger or pointer, enabling precise recognition of input instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area ratio of shadow region to finger region is used to determine touch, then touch detection is achieved, but various touch operations cannot be correctly distinguished
Solution Approach 1:
The patent segments the touch detection process into multiple independent analysis dimensions: shadow region extraction, finger region extraction, focus determination, and operation type classification. Each dimension processes specific image data independently, allowing accurate distinction between different touch operations by analyzing multiple segmented features rather than relying on a single area ratio metric.
2Productivity
If the finger stays near the projection screen during double-tap operation, then the operation is performed quickly, but it becomes difficult to distinguish from constant touch
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring focus status and shadow region changes over time. The operation determining unit analyzes temporal sequences of focus determination results and shadow region variations, providing feedback that enables distinction between double-tap operations (where focus status changes between taps) and constant touch operations (where focus status remains stable), even when both are performed quickly.
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
The device effectively recognizes various touch operations, including tap, double-tap, long-tap, drag, and flick, by accurately determining the presence and position of a finger or pointer, thereby improving the accuracy of input instructions on a projected image.
Implementation Method 1
an imaging unit having a function of focusing and configured to image the image projected on the projection screen to acquire image data
Data Source
AI summary
An image projection device which can correctly discern content of touch operation when a user performs various kinds of touch operation on an image projected on a projection screen is provided. An imaging unit is configured to image the image projected on the projection screen and acquire image data. A reference data generating unit is configured to generate reference data specifying a position and a size of the image projected on the projection. An image data extracting unit is configured to extract image data in which a finger or a pointer with which a user performs operation on the image projected on the projection screen exists is focused in the image data obtained by the imaging unit. A position data generating unit is configured to generate position data for specifying a position of the finger or the pointer in the imaging range of the imaging unit.