Flickering artifacts are removed from a displayed image by storing digital
luminance values in a compressed form using disallowed luminance values clipped
from a range of luminance values to encode run lengths of identical values of truncated
luminance values and bits corresponding to bits truncated from the luminance values.
A correction value is derived from a filter transfer function computed by summing
an increase in correction value above a threshold within a range of luminance differences
with a maximum change in correction value in each lower range, this providing a
piecewise linear substantially quadratic transfer function without discontinuities
that would engender other image artifacts. The non-linearity of the transfer function
is this adaptive to different image conditions and types in regions of respective
image planes and the correction factors implemented by the transfer function are
freely adjustable to accommodate, for example, different scanning standards and
display refresh rates.
