Digital Decal

This research introduces Digital Decal, a novel pen-based interaction technique that enables the direct and intuitive transfer of physical textures and images onto digital screens. Inspired by the traditional decalcomania method, the project utilizes a specialized DecalPen prototype equipped with color and position sensors to bridge the gap between physical materials and computing environments. Users can place ordinary paper, fabric, or organic materials like leaves on a tablet and "rub" the surface to instantly digitize the underlying patterns. To ensure high-fidelity reproduction, the system employs a dead-reckoning technique to minimize system delay and a Gaussian spray effect to produce natural color blending. The project offers two distinct interaction modes: a scanner mode for direct image copying and a stencil mode for applying textures to predefined digital regions. By providing spatial congruence and a tactile rubbing experience, this work offers a playful and expressive medium for artistic creation that expands the possibilities of digital drawing interfaces.