Method for using a variable aperture to tune image quality parameters in a camera system
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United States of America Patent
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Issued Date -
Dec 9, 2010
app pub date -
Jun 4, 2010
filing date -
Jun 4, 2009
priority date (Note) -
Abandoned
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Abstract
In a camera system with a variable aperture, variations can be used to tune a variety of optical parameters otherwise incapable of being tuned within the structural limitations of the camera system or to optimize tradeoffs between competing factors such as diffraction limits and lens aberrations. For example, the variable aperture can be used to avoid overexposure or underexposure of an image due to improper illumination of an object. The variable aperture can be used to tune hyperfocal distance, enabling an accurate focus of an object to be obtained even if the camera lens is incapable of auto-focusing. In a camera with a lens having a focal length that varies with radial position from the lens center, the variable aperture can achieve the effect of auto-focus.
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