參數(shù)資料
型號： M66335FP
廠商： Mitsubishi Electric Corporation
英文描述： FACSIMILE IMAGE DATA PROCESSOR
中文描述： 傳真寄發(fā)圖像數(shù)據(jù)處理器
文件頁數(shù)： 17/57頁
文件大?。?/td> 656K
代理商： M66335FP
17
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
`
Background/character level detection
The M66335 uses not the fixed threshold system but the floating
threshold system, where the optimal threshold for simple conversion-
to-binary of objective pixels are continually generated by constantly
detecting background/character levels.
Accordingly, the threshold value proper for image data is generated
without processing the data.
The threshold value is used for the areas to be converted to binary
when simple conversion-to-binary or image zone separation is se-
lected as the mode of conversion to binary in reading data.
: register 07 (MODE)
Background level counter
When image data greater (lighter in light) than the current value are
input, this counter counts up to approximate to the data.
When image data smaller (darker in light) than the current value are
input, this counter counts down to approximate to the data.
Image data
Background level
detection counter
Character level
detection counter
Generation of
the threshold
value
Comparison
Converted
binary data
This slope is decided through MAX_UP.
This slope is decided through
MAX_DOWN.
This slope is decided
through MIN_UP.
Fixing of the background level
White level
Background level
Lowest limit of the
background level
(LL_MAX)
Highest limit of
the character level
(UL_MIN)
Threshold
level
Input data
Fixing of the
character level
Character level
Black level
Threshold level = (background level point – character level)
×
K + character level
K = threshold factor for conversion to binary: register 07 (SLICE)
Lowest limit of the background level (LL_MAX) > highest limit of the character level (UL_MIN)
Fig. 13 Background/character levels
Setting of the rate of count-up/count-down following data input
: register 0C (MAX_UP, MAX_DOWN)
Setting of the lowest limit for background levels
: register 0E (LL_MAX)
Character level counter
When image data greater (lighter in light) than the current value are
input, this counter counts up to approximate to the data.
When image data smaller (darker in light) than the current value are
input, this counter counts down to approximate to the data.
Setting of the rate of count-down following data input
: register 0C (MIN_UP)
Setting of the highest limit for character levels
: register 0D (UL_MIN)
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