METHOD, APPARATUS AND COMPUTER PROGRAM PRODUCT FOR SENSING OF VISIBLE SPECTRUM AND NEAR INFRARED SPECTRUM

摘要

In accordance with an example embodiment a method, apparatus and computer program product are provided. The method comprises filtering incident light by an IR cut-off filter to generate filtered light. The IR cut-off filter comprises a plurality of pixels with pass-band characteristics for visible light wavelengths and is configured to perform stop-band attenuation of near infrared (NIR) wavelengths. The stop-band attenuation is configured to vary based on spatial location of pixels within the IR cut-off filter. The filtered light received from the IR cut-off filter is sensed by the image sensor to generate sensed light. A baseband signal and a modulated NIR signal are determined by performing transformation of the sensed light. A NIR spectrum associated with the incident light is determined by demodulating the modulated NIR signal. A visible spectrum associated with the incident light is determined based on the NIR spectrum and the baseband signal.

主权项

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; determining a baseband signal and a modulated NIR signal by performing 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.