OPERATING AND USER MANUAL QUARTZ SERIES
66
Image tagging
10.2.3.
Image overlay
Each image can be tagged with a frame counter. Depending on the OVL command setting, this
information can be either overlaying the actual video data or added as an extra video line.
The frame counter value is represented by the grey level value of 4 pixels.
The total of 4 pixels project as a 32 bit counter. Each pixel represent 8 bits of that counter where the
left pixel represents the 8 most significant bits and the right pixels represents the 8 least significant
bits.
The frame counter value is:
(Value pixel 1) + (Value pixel 2 * 2^8) + (Value pixel 3 * 2^16) + (Value pixel 4 * 2^24)
The counter range is therefore 0 - 2^32. When the counter reaches the upper range limit, it will roll
over to 0 and count up from there.
Command format: OVLx
Command format:
OVL?
Return Message: x
Where:
x = 0 disables image tagging
x = 1 overlays the first 4 pixels in the first image line with the count tag
x = 2 adds an extra image line in front of the image
x = 3 adds an extra line after the actual video lines.
Position and layout of frame counter pixels in the image.
Figure 10.7:
NOTE:
when 10 bit pixel resolution is selected, the 8 most significant bits of a frame counter pixel are
used.
The maximum frame counter value will therefore not increase.
Frame counter reset.
The frame counter can be reset to 0 manually by the FCR command.
Command format:
FCR
“Line 2048+1”
“Line 1-1”
Line 2048
OVL2
→
OVL3
→
OVL1
→
Line 1
1
2
3
4
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