Patent ID: 9383259
Filing Date: 2016-07-05
CPC Classification: G01J,G02B,H01L,H04N

Claim Text:
1. A method comprising: filtering incident light by an infrared (IR) cut-off filter disposed in an optical path between a lens and an image sensor to generate filtered light, the IR cut-off filter comprising a plurality of pixels with pass-band characteristics for visible light wavelengths associated with the incident light, the plurality of pixels configured to perform stop-band attenuation of near infrared (NIR) wavelengths associated with the incident light for filtering of the incident light, the stop-band attenuation of the NIR wavelengths configured to vary based on spatial location of pixels of the plurality of pixels within the IR cut-off filter; sensing the filtered light received from the IR cut-off filter by the image sensor to generate sensed light, wherein the IR cut-off filter comprises spatially varying transparency attributes configured to vary along a direction to configure a cosine-function of spatial location based attenuation; determining a baseband signal with an unmodulated visible spectrum and an amplitude modulated NIR signal by performing the cosine-function based transformation of the sensed light; determining a NIR spectrum associated with the incident light by demodulating the modulated NIR signal; and determining a visible spectrum associated with the incident light based on the NIR spectrum and the baseband signal.