OPTICAL SYSTEM FOR AN IMAGE ACQUISITION DEVICE

摘要

An optical system for an image acquisition device comprises a filter comprising a central aperture arranged to transmit both visible and selected near infra-red (NIR) wavelengths and a peripheral aperture arranged to block visible wavelengths and to transmit the NIR wavelengths. An image sensor comprises an array of pixels including pixels sensitive to visible wavelengths and corresponding pixels sensitive to the NIR wavelengths. A lens assembly is axially located between the filter and the image sensor and comprises a plurality of lens elements. The lens elements are arranged to simultaneously focus NIR light received from a given object through central and peripheral apertures of the filter and visible light received from the object through the central aperture onto the sensor surface.

主权项

1. An optical system for an image acquisition device comprising:
a filter comprising a central aperture arranged to transmit both visible and selected near infra-red (NIR) wavelengths and a peripheral aperture arranged to block visible wavelengths and to transmit said NIR wavelengths; an image sensor comprising an array of pixels including pixels sensitive to visible wavelengths and corresponding pixels sensitive to said NIR wavelengths; and a lens assembly axially located between said filter and said image sensor and comprising a plurality of lens elements, said lens elements being arranged to simultaneously focus NIR light received from a given object distance through said filter central and peripheral apertures and visible light received from said object distance through only said central aperture on said sensor surface.