Using perceptual texture masking for efficient image synthesis

    Authors

    B. Walter; S. N. Pattanaik;D. P. Greenberg

    Comments

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    Abbreviated Journal Title

    Comput. Graph. Forum

    Keywords

    visual perception; perceptual rendering; texture mapping; JPEG; Computer Science, Software Engineering

    Abstract

    Texture mapping has become indispensable in image synthesis as an inexpensive source of rich visual detail. Less obvious, but just as useful, is its ability to mask image errors due to inaccuracies in geometry or lighting. This ability can be used to substantially accelerate rendering by eliminating computations when the resulting errors will be perceptually insignificant. Our new method precomputes the masking ability of textures using aspects of the JPEG image compression standard. This extra information is stored as threshold elevation factors in the texture's mip-map and interpolated at image generation time as part of the normal texture lookup process. Any algorithm which uses error tolerances or visibility thresholds can then take advantage of texture masking. Applications to adaptive shadow testing, irradiance caching, and path tracing are demonstrated. Unlike prior methods, our approach does not require that initial images be computed before masking can be exploited and incurs only negligible runtime computational overhead. Thus, it is much easier to integrate with existing rendering systems for both static and dynamic scenes and yields computational savings even when only small amounts of texture masking are present.

    Journal Title

    Computer Graphics Forum

    Volume

    21

    Issue/Number

    3

    Publication Date

    1-1-2002

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    393

    Last Page

    +

    WOS Identifier

    WOS:000178024900022

    ISSN

    0167-7055

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