Phytec eGrabber-4plus, Hardware Manual

Page: 195 / 206

Trouble-Shooting

PHYTEC Meßtechnik GmbH 2004 L-608e_4
185
m
The lower edge of the image is missing/no image is digitized
l
The vertical image size was chosen too large.
l
It was not recognized, that starting from a line number higher
than 288 lines 288 (PAL) or 262 (NTSC), a whole frame must
be used.
m
The colors are not presented properly.
l
The values hpos and hsize must be even, in order that the color
decoding works properly.
l
In the user program: You mixed up Cr/Cb .
l
Did you select the correct color format?
l
The chroma gain registers were changed.
l
Please pay attention, that for a correct Hue setting the U- and V-
component must be identical in respect to their percentage
value. But the values of the registers are different!
m
During continuous grabbing the image jumps one line up/down.
l
The parity of the field is neglected. Pay attention in order to
demand always the same field. The memory region for the even
and odd image should not be the same!
Note:
The mismatch is actually a half line, therefore the mismatch can
not be compensated by displacing one line.
l
The video source delivers no proper signal.
l
Switching channels between two cameras occurs too quickly
m
During the display of frames diagonal lines/circles are interlaced
or have unclear perimeter edges.
l
Even and odd fields are interchanged (only possible in case you
use single fields).