Handwriting Support Device Using Non-Display Image Masking
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Solution Overview
Problem
Handwriting support devices using augmented reality (AR) techniques cause discomfort due to conflicting depth perception cues, as the virtual image is superimposed on the user's hand, leading to a shift in visual information that affects the writing experience.
Innovation Solution
A handwriting support device employing a half mirror and image display surface configuration where a non-display processed image is projected onto the writing surface, with the image display control unit processing regions corresponding to the vertically projected area of real objects, such as hands, to prevent overlap and reduce depth perception discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a virtual image is superimposed on the writing surface using a half mirror, then handwriting guidance is provided, but the virtual image overlaps with the user's hand causing depth perception discomfort
Solution Approach 1:
The patent extracts the virtual image display from the hand region by detecting the hand's position and removing or masking the virtual image content that would overlap with the hand. This separation eliminates the conflicting depth cues while preserving the handwriting guidance function in non-hand regions.
Solution Approach 2:
The patent applies different display qualities to different regions: the virtual image is displayed normally in regions where the hand is not present, but is suppressed or modified in regions where the hand is detected. This local differentiation resolves the depth perception conflict while maintaining overall guidance effectiveness.
2Loss of information
If binocular parallax is used to determine AR object position behind the hand, then depth information is provided, but monocular shielding effect determines the AR object is in front of the hand, causing information conflict
Solution Approach 1:
The patent removes the conflicting virtual image information from the hand region, eliminating the source of the binocular-monocular depth conflict. By extracting the problematic overlay, the system prevents the information conflict while preserving depth information in regions where no conflict occurs.
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 solution effectively reduces user discomfort by ensuring the virtual image is not overlaid on the hand, thereby improving the handwriting support function and enhancing the writing experience by maintaining accurate positional information.
Implementation Method 1
a half mirror 20; an image display surface 32 positioned to face at a side of a mirror surface of the half mirror 20
Data Source
AI summary
A handwriting support device includes a half mirror; an image display surface; a writing surface, a virtual image of an image displayed on the image display surface being projected on the writing surface. In a case where a real object is inserted onto the writing surface, the image display control unit causes a non-display processed image to be displayed on the image display surface, the non-display processed image being obtained by at least a partial region, of a region of the first image corresponding to a vertically projected region of the real object on the writing surface, being subjected to non-display processing. In the handwriting support device, an image, which is a virtual image of the non-display processed image in which at least a part of an inside of the vertically projected region of the real object is non-displayed, is projected onto the writing surface.