Printer and image processing method for adjusting printing criteria to compensate for low/high density images
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United States of America Patent
Stats
-
Nov 28, 2000
Grant Date -
N/A
app pub date -
Nov 7, 1997
filing date -
Nov 8, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Luminance levels of an analog or digital image signal entered from outside are detected as a luminance histogram. Based on the luminance histogram, a black luminance level and a white luminance level are determined, and are assigned respectively to a darkest tonal level and a lightest tonal level of a gradation range available for printing. To those pixels having luminance levels between the black and white levels, tonal levels between the darkest and lightest tonal levels are assigned according to a gradation conversion curve. The gradation conversion curve is selected among from a plurality of predetermined conversion curves depending upon a scene discrimination coefficient. The scene discrimination coefficient is calculated by multiplying the frequency of each luminance level shown in the luminance histogram with a different luminance coefficient predetermined according to the luminance level, and accumulating multiplication results of all the luminance levels.
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Cited Art Landscape
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