Sharp IV-C35M User Manual page 85

(5) Binary processing (fixed/threshold value correction)
By setting THRESHOLD-ADJ (threshold adjustment function), the IV-C35M can cope with variations
in lighting.
Threshold correction value
Threshold correction using either VAR-DIFF (enter variations in lighting as value) and
VAR-RATE (enter variations in lighting as a rate) can be selected the THRESHOLD-ADJ
(the threshold adjustment function).
Set (selection) item
Variation
difference
Threshold value
adjustment
Variation
rate
Measurement programs which are affected by these settings
Area measurement by binary conversion, object counting by binary conversion, object
identification by binary conversion, point measurement (binary images)
Setting method
Select " THRESHOLD" on the "REG COND"
screen and then change the upper and lower
limit values using the up, down, left, and right
arrow keys.
Setting the Conditions for Each Object Type
Fixed
Fails to convert the image
due to a variation in lighting
Details of correction
Correct the threshold value by adding the previously specified threshold
value to the light level variation difference.
(Measured light level — reference light level) + specified threshold value
Correct the threshold value by multiplying the previously threshold value
to the light level variation rate.
(Measured light level ÷ reference light level) x specified threshold value
3-23
(threshold adjustment
function), the monitor brightness
functions must be selected to
measure variations in lighting. If
you don't select the monitor
brightness function, a LIGHT LVL
NOT SET (correcting binary value:
monitor illumination not selected)
error will occur.
REG COND SCREEN COND SAVE DETAIL
1MEAS SHAPE
RECTANGLE
2MEAS AREA
SET (224,208)~(287,271)
3THRESHOLD
SET [U.LM255 L.LM100(0~255)]
4INVERT B/W
NO
Change using the up and
down arrow keys.
3
COLOR F C1 BRT