DOCUMENT CAMERA

A document camera includes a liquid lens and an extended depth of field (referred to as EDoF) module. The liquid lens adjusts its diopter value in accordance with a voltage value provided by a control circuit, and is used to form an image with a longer image distance from an object with a shorter im...

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Bibliographic Details
Main Author LIN REIN-WEIN
Format Patent
LanguageEnglish
Published 28.10.2010
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A document camera includes a liquid lens and an extended depth of field (referred to as EDoF) module. The liquid lens adjusts its diopter value in accordance with a voltage value provided by a control circuit, and is used to form an image with a longer image distance from an object with a shorter image distance. The object and the image both are located at the same side of the liquid lens. The EDoF module is located behind the liquid lens to process an image by using a wavefront coding technique, and comprises a wavefront encoder used for performing wavefront coding onto the image; a signal processor for converting the image which has been wavefront-coded into digital signals; and a digital image processor for converting the digital signals into image signals.
Bibliography:Application Number: US20090512746