FrameMaker Ver5.5E(PC) CF1501/CF2001 MECHANICAL/ELECTRICAL
00.12.15
M-22
8. AE Processing
• Lightness data readings are tallied up for each four gradation levels using the image data
sampled through “Histogram Making.”
• The lightness data readings tallied up for each four gradation levels are totaled to gener-
ate one lightness histogram (for AE processing).
• From the histogram with lightness blocked into four gradation levels, the local maximum
value of each block (the gradation level with the greatest frequency in each block) is
extracted.
• Calculation is made to determine if there is any gradation level extracted, the sum of fre-
quency of ±8 gradation levels of which accounts for a given level or more of the sum of
frequency of the entire original. (Processing is done in the order of the gradation level of
higher lightness).
• If there is, the AE level (local minimum value) is determined according to the lightness
frequency at that local maximum value.
• If not, the AE level is determined according to the original mode.
• The AE processing table is determined based on the AE level.
• Background processing (AE processing) is performed as the AE processing table is
determined.
Histogram Making
AE Level Evaluation
Color
Monochrome
Lightness Histogram
Frequency
1154M080AB
4 gradation levels
Local maximum value
Low
Lightness
High
Содержание CF1501
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