| 摘要 |
A lens cover (12) for a digital camera (10) 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 (16). 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.
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