User`s manual

G-11
Glossary
G
Reference image
(Standard)
Search coordinates use
a pixel level of precision
(High precision)
Search coordinates use a
sub pixel level of precision
Degree of match
Degree of match
0
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Ë 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-S30). "Sub pixel" refers to a unit smaller than a single pixel (DTECT PRECISION: HIGH
(detection precision: high) for 1/10 pixel in case of the IV-S30).
(Captured image)
Threshold value B
Threshold value A
Binary conversion
Binary conversion
Binary conversion
(upper limit = A,
lower limit = B)
255
(Threshold value)
Lower
limit A
B
0
Black
White
255
(Threshold value)
Upper
limit A
Lower
limit B
0
Black
Black
White
255
(Threshold value)
A
Lower
limit B
0
Black
White
(Upper limit = 255, lower limit = A)
(Upper limit = 255, lower limit = A)
Ë 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.
[T]
Ë Threshold value
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.