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Glossary
Sub pixel, pixel
Refers to the pixel precision level to be used with the gray scale search function.
-A "pixel" is one picture element (DTECT PRECISION: STANDARD (detection precision: standard)
in case of the IV-C35M). "Sub pixel" refers to a unit smaller than a single pixel (DTECT PRECI-
SION: HIGH (detection precision: high) for 1/10 pixel in case of the IV-C35M).
Reference image
(Standard)
Search coordinates use
a pixel level of precision
[T]
Threshold value
G
The criteria used for binary conversion of a gray scale image. If an area of the image is lighter than
this threshold value, it is converted to 1. If an area of the image is darker than the threshold value, it
is converted to 0.
Threshold value setting
The IV-S30 treats the "areas darker than the lower limit value" or "brighter than the upper limit
value" as "black." It treats that the areas between the upper limit value and lower limit value as
"white." However, if the white-black reverse function is enabled, conversion to white/black will be
reversed. Normally, if you want to use only one threshold value for binary conversion, set the upper
limit value to "255." Then you only need to adjust the lower limit value to a threshold value that
works for our application.
(Captured image)
Binary conversion
(upper limit = A,
lower limit = B)
0
1 2 3 4 5 6 7 8 9
1
2
3
4
5
6
7
8
9
Degree of match
Threshold value B
Binary conversion
(Upper limit = 255, lower limit = A)
Threshold value A
(Threshold value)
255
Upper
limit A
Lower
limit B
0
(High precision)
Search coordinates use a
sub pixel level of precision
Binary conversion
(Upper limit = 255, lower limit = A)
Black
White
Black
G-12
(Threshold value)
255
Lower
White
limit A
Black
B
0
(Threshold value)
255
A
White
Lower
limit B
Black
0
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