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Local and global visual processing.

D C Burr, M C Morrone, J Ross

    Vision Research
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Visual analysis mechanisms were studied using a modified chequerboard pattern. The visual system performs local analysis when the fifth harmonic is visible and global analysis when it is not.

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    Area of Science:

    • Visual perception
    • Computational neuroscience
    • Image analysis

    Background:

    • Chequerboard patterns contain fundamental sinusoidal components oriented at 45 degrees to the edges.
    • Removing one component (+45 degrees sinusoid) creates a pattern useful for studying visual analysis mechanisms.

    Purpose of the Study:

    • To investigate the local and global analysis mechanisms of the human visual system.
    • To understand how the presence or absence of specific harmonic components influences pattern perception.

    Main Methods:

    • Utilized a modified chequerboard pattern lacking a +45 degree fundamental sinusoid.
    • Measured contrast thresholds for perceiving diagonality at different viewing distances and spatial frequencies.
    • Employed low-pass filtering to alter the visibility of harmonic components.

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    Main Results:

    • Close viewing resulted in perceived +45 degree orientation, indicating local analysis, despite the absence of global energy at this orientation.
    • Distant viewing shifted perceived diagonality to -45 degrees, suggesting access to global information.
    • Contrast thresholds for +45 degree diagonality closely matched detection thresholds for the pattern's 5th harmonic component.
    • Low-pass filtering, removing the 5th harmonic, led to perception based on global energy.

    Conclusions:

    • The visual system employs local analysis when the 5th harmonic component of the modified chequerboard pattern is visible.
    • Global analysis is utilized when the 5th harmonic component is absent or removed, as demonstrated by low-pass filtering effects.
    • These findings highlight the context-dependent nature of visual information processing in humans.