Spatial noise in microdisplays for near-to-eye applications
2011
Spatial noise in imaging systems has been characterized and its impact on image quality metrics has been addressed
primarily with respect to the introduction of this noise at the sensor component. However, sensor fixed pattern noise is
not the only source of fixed pattern noise in an imaging system. Display fixed pattern noise cannot be easily mitigated
in processing and, therefore, must be addressed. In this paper, a thorough examination of the amount and the effect of
display fixed pattern noise is presented. The specific manifestation of display fixed pattern noise is dependent upon the
display technology. Utilizing a calibrated camera, US Army RDECOM CERDEC NVESD has developed a microdisplay
(μdisplay) spatial noise data collection capability. Noise and signal power spectra were used to characterize the
display signal to noise ratio (SNR) as a function of spatial frequency analogous to the minimum resolvable temperature
difference (MRTD) of a thermal sensor. The goal of this study is to establish a measurement technique to characterize
μdisplay limiting performance to assist in proper imaging system specification.
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