Thresholding - Microscan Quadrus EZ Reader User Manual

Thresholding

Thresholding
Threshold Mode
Fixed works better when decode time must be as short as possible and the
Usage: reflectance and illumination of the symbol area is uniform and unchanging.
Otherwise Adaptive is the preferred mode.
This value switches the image processing threshold mode between the
Adaptive and Fixed modes.
An adaptive routine sets the light/dark threshold from data acquired from
the current read. A fixed mode applies the same gray scale threshold value
Definition:
to each and every symbol.
Generally, Adaptive gives better results than Fixed.
Unlike Adaptive, Fixed applies the same value consistently to each and
every symbol.
Serial Cmd: <K512,threshold
Default: Adaptive
Options: 0 = Adaptive
Threshold Value
A higher value will increase the threshold for distinguishing between light
Usage:
and dark elements.
Determines how the reader will distinguish light from dark pixels.
Definition:
This value is used for the Fixed Mode only. When the Adaptive Mode is set,
this value is ignored.
Serial Cmd: <K512,threshold
Default: 128
Options: 0 to 255
9-18
mode,threshold value>
1 = Fixed
mode,threshold value>
Quadrus EZ Reader User's Manual