Chapter 9 Vision Manager
159
Note
What is digitization?
What is a histogram?
This graph gives the brightness frequency distribution for pixels within the specified range inside
the window showing the camera image. Displaying the brightness distribution as a graph (histo-
gram) simplifies the task of selecting thresholds for digitizing the image. Histograms allow the
DENSO µVision board to automatically determine digitization thresholds.
Caution
Only rectangular processing windows (angle = 0) can be selected for image processing.
The DENSO
µ
Vision board accepts as camera input gray scale images
with 256 possible values for each pixel brightness. Digitization uses
brightness thresholds (boundaries) to make each pixel either pure white
or jet black. There are two digitization thresholds. Pixels between the two
thresholds become white (1); everything else, black (0).
Before digitization
After digitization
.QYGT
VJTGUJQNF
7RRGT
VJTGUJQNF
.QYGT
VJTGUJQNF
7RRGT
VJTGUJQNF
#HVGTFKIKVK\CVKQP
#HVGTFKIKVK\CVKQP
(KIWTG
6CTIGV
㪙㪸㪺㫂㪾㫉㫆㫌㫅㪻
(KIWTG
$GHQTGFKIKVK\CVKQP
$TKIJVPGUU
%QWPVQHRKZGNU
Содержание WINCAPS III
Страница 1: ...Programming Support Tool WINCAPSIII GUIDE...
Страница 18: ...vi CONTENTS...
Страница 64: ...46 Chapter 3 Starting Up Shutting Down...
Страница 196: ...178 Chapter 10 Appendices...
Страница 198: ......