| 摘要 |
<p>A lens cover for a digital camera provides a diffused light source for calibration purposes which approximates a flat field light source. In this way, digital cameras may be calibrated in the field under user control. The diffuser may be in the form of a light transmissive hologram. The hologram may have formed thereon a plurality of light diffusing shapes. The camera may be calibrated either by itself or advantageously when connected to a host computer. The user may be prompted through the calibration sequence.</p> |
