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Chapter 5 Vision Control

5-7

5.1.1.6 Brightness Integral Value

The total of all pixel brightness values in the range designated with the window

for the obtained image from the camera is called a brightness integral. The

value of the total is called a brightness integral value.

Window

Brightness integral value

=100

 ~

 {

 ~

12=1540

100 100 100 100 100

20 20 20 20 100

Fig. 5-11 Brightness Integral Value

5.1.1.7 Edge

A point that changes the object in a designated window from dark to light (black

to white) or light to dark (white to black), namely, the brightness changing point,

is called an edge.

The edge position that is detected by the µVision board is the brightness value

of the area value that satisfies the designated level value. You can use an

absolute value and a differential value to designate the level value. Use them

appropriately, depending on the status of the object. For absolute designation,

the system detects a level where the brightness value or area value passes the

designated position. However, in differential value designation, positions are

detected where the changed brightness value or area value is greater than the

designated value.

Position

Level

: edge detection

position

Window

Edge

Absolute value

Level value

Difference

value

Brightness

Fig. 5-12 Edge

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 691 692

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