4 May 2010 Technical assessment of low light color camera technology
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Abstract
In nighttime overcast conditions with a new moon (near-total darkness), typical light levels may only reach 10-2-10-4 lux. As such, standard CCD/CMOS video cameras have insufficient sensitivity to capture useful images. Third generation night vision cameras (Gen III NV) are the state-of-the-art in terms of imaging clarity and resolution at this light level, but rely on green or green/yellow phosphors to produce monochromatic images while true color information is lost. More recently, low-light color video cameras have become commercially available which are purportedly able to produce truecolor images at rates of 15-30 frames per second (fps) in near-total darkness without loss in clarity. This study determined if the sensitivities of two low-light color video cameras, Toshiba's IK-1000 EMCCD and Opto-Knowledge System's (OKSI) True Color Night Vision (TCNV) cameras are comparable to current Gen II/III NV technology. NRL, in a joint effort with NSWC Carderock Division, quantified the effectiveness of these cameras in terms of objective laboratory characterization and subjective field testing. Laboratory tests included signal-to-noise (S/N), spectral response, and imaging quality at 2, 15, and 30 frames per second (fps). Field tests were performed at 8, 15, and 30 fps to determine clarity and color composition of camouflaged human subjects and stationary objects from a set number of standoff distances under near-total darkness (measured at 10-8-10-10 W/cm2 sr @ 650nm). Low-light camera video was qualitatively compared to imagery taken by Stanford Photonics Mega-10 Gen III Night Vision Scientific and Tactical Imagers under identical conditions.
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Scott A. Ramsey, Scott A. Ramsey, Joseph Peak, Joseph Peak, Brian Setlik, Brian Setlik, } "Technical assessment of low light color camera technology", Proc. SPIE 7687, Active and Passive Signatures, 76870H (4 May 2010); doi: 10.1117/12.863211; https://doi.org/10.1117/12.863211
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