Denso RC5 Specifications download pdf (Page 145)

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Chapter 5 Vision Control

5-5

[ 3 ] Binarization Level Detection

Mode Method

If the histogram of an image forms a double-humped distribution, which has

two peaks corresponding to the object shape and the background, the method

used to set the binarizatioin level (t) to the valley section (t) which lies between

the two humps is called a mode method.

Since the µVision board detects the peak and valley in the histogram in the

direction from brightness value 0 to 255, as shown in Fig. 5-8, point t is

regarded as the valley and the board sets it as the binarization level.

Fig. 5-8 Binarization Level Due to Mode Method

Discrimination Analysis Method

In an image histogram, you divide the brightness value into black and white

sections with the binarization level K. The method of determining the

binarization level K by using the statistical method to clearly divide the 2

sections is called the discrimination analysis method.

If a image does not have a double-humped distribution histogram, the mode

method described above is inappropriate. You can determine the optimal

threshold value with the discrimination analysis method instead.

Fig. 5-9 Binarizatioin Level by Discrimination Analysis Method

0 k 255

Number of

pixels

Brightness value

Number of pixels

Detection direction

255

Brightness value

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 691 692

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Denso RC5 Specifications Page 145

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