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Related Concept Videos

Fischer Projections02:18

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Related Experiment Video

Updated: Feb 8, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Paxel: A Generic Framework to Superimpose High-Frequency Print Patterns using Projected Light.

Petar Pjanic, Anselm Grundhofer

    IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
    |July 12, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We introduce Paxel, a framework for projector-surface interactions. This enables novel color-changing effects and full-color projection using UV light and fluorescent pigments, with applications in art and advertising.

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    Area of Science:

    • Computer Graphics
    • Optics
    • Display Technology

    Background:

    • Traditional projection systems often face limitations in color manipulation and display capabilities.
    • The interaction between projected light and patterned surfaces is not fully exploited for dynamic visual effects.

    Purpose of the Study:

    • To present Paxel, a generic framework for modeling projector-patterned surface interactions.
    • To demonstrate novel applications including dynamic color alteration and single-channel full-color projection.

    Main Methods:

    • Developed a framework modeling projector-surface interactions, focusing on spatially varying reflectance properties.
    • Implemented two applications: a color-changing effect using patterned vs. uniform surfaces and a UV projection system with fluorescent pigments.
    • Analyzed reproducible colors based on pattern layout, dot size, and k-means clustering.

    Main Results:

    • Achieved a novel color-changing effect by switching projection surfaces, altering hue and chroma.
    • Demonstrated embedding two distinct images within a single static projection, revealed by surface type.
    • Successfully created full-color images using a single-channel UV projector and fluorescent pigments.
    • Enabled projection through participating media (e.g., fog) with hidden scattering outside the visible spectrum.

    Conclusions:

    • Paxel offers a versatile approach to dynamic visual effects and advanced display possibilities.
    • The framework has potential applications in art, advertising, entertainment, and visual cryptography.
    • Further analysis provides insights into controlling reproducible colors through algorithmic parameters.