5-6
P Tile Method
This method detects the binarization level where the object area coincides with
Sx, by the use of a histogram when the object’s white and black area is
already known as Sx.
If the object is white, the area is obtained by adding pixels from a higher
brightness value of the histogram. If the calculated result reaches Sx at the
brightness level, the brightness value is set as the binarization level.
If the object is black, the area is obtained by adding pixels from a lower
brightness value. The binarizatioin level is obtained in the same manner as the
white area.
This method is effective when the object area is known beforehand.
Detection direction of white object
Fig. 5-10 Binarization Level Due to P Tile Method
Number of pixels
Brightness
value
0
Binarization Level
255
Object area
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