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    Analysis of Clipping Effect in Color Images Captured by CCD Cameras

    Park, Jae Byung
    DeSouza, Guilherme
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    [PDF] ClippingEffectColorImagesCCDCameras.pdf (1.060Mb)
    Date
    2004-10
    Format
    Article
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    Abstract
    Camera sensors (CCD) have a limited dynamic range that constrains the brightness of the incident light that can be quantified. In other words, if the ray of incident light is too intense, the sensor saturates and the value quantified is inadequately represented. This color clipping effect is a common problem in computer vision and it can become specially difficult when dealing with specular objects against a low-intensity background. In this paper, we present a method for analyzing such clipping effects of CCD cameras appearing in color images. Using an averaging technique to estimate the color of the illuminant, we define two types of axes in the RGB color cube: the Illumination Axis and the Clipping Axis. Our study concludes the followings: 1) the clipped pixels from a dielectric object form one or two lines, depending on the number of color channels on which the clipping effect takes place; and 2) these lines are parallel to the Clipping Axes. These two properties allow for a framework for a color-based segmentation that works even in the presence of saturated (specular) regions in the image. Moreover, the captured images can now be obtained under a wider variation of illumination conditions.
    URI
    http://hdl.handle.net/10355/9248
    Part of
    Electrical and Computer Engineering publications (MU)
    Citation
    Proceedings of the Third IEEE Conference on Sensors, pp. 24-27, Vienna, Austria, Oct. 2004.
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
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    • Electrical Engineering and Computer Science publications (MU)

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