Abstract
A short, but finite, exposure aperture time is necessary for an imager
to photoelectrically accumulate converted electrons in a temporal sample.
As the output is the electrical signal averaged over the exposure time, motion
blur in images of moving objects can occur. In current assessments of the
quality of television images, the observer's static visual acuity (SVA) must
be screened before the subjective evaluation. However, in the subjective evaluation
of moving image sharpness, an observer's evaluation may not be correlated
with their SVA but instead with their dynamic visual acuity (DVA). In the
present work, we show that the evaluation of moving-picture sharpness was
not correlated with SVA but instead with DVA for a visual target with a spatial
frequency corresponding to a decimal-scale SVA of 0.8 (DVA 0.8). Our results
show that viewers with good DVA tend to provide a harsher assessment (i.e.,
a lower score) of the sharpness of images of moving objects, suggesting that
DVA screening is essential before assessment of the sharpness of television
images. We also propose an SVA screening threshold value of 0.8, because the
maximum DVA is almost equal to SVA when the viewed object is not in motion.
© 2012 IEEE
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