Dalsa spyder SG-10-01k80, Руководство пользователя

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PRELIMINARY Spyder3 GigE User Manual
03-032-10158-04 DALSA
78
A2.3 End-of-line Sequence
Purpose: Produces an end-of-line sequence that provides basic calculations
including "line counter", "line sum", "pixels above threshold",
"pixels below threshold", and "derivative line sum" within the
region of interest. These basic calculations are used to calibrate
analog offset (
104H
cao
) and calibrate analog gain (
105H
ccg
).
To further aid in debugging and cable/data path integrity, the
first three pixels after Line Valid are "aa", "55", "aa". Refer to the
following table. These statistics refer only to pixels within the
region of interest.
Syntax:
els i
Syntax Elements:
i
0
Disable end-of-line sequence
1
Enable end-of-line sequence
Notes: •
LVAL is not high during the end-of-line statistics.
Example:
els 1
Table 12: End-of-Line Sequence Description
Location Value Description
1 A’s
2 5’s
3 A’s
By ensuring these values consistently
toggle between "aa" and "55", you can
verify cabling (i.e. no stuck bits)
4 4 bit counter LSB justified
Counter increments by 1. Use this value to
verify that every line is output
5 Line sum (7…0)
6 Line sum (15…8)
7 Line sum (23…16)
8 Line sum (31…24)
Use these values to help calculate line
average and gain
9 Pixels above threshold (7…0)
10 Pixels above threshold
(15…8)
11 Pixels below threshold (7…0)
12 Pixels below threshold (15…8)
Monitor these values (either above or
below threshold) and adjust camera
digital gain and background subtract to
maximize scene contrast. This provides a
basis for automatic gain control (AGC)
13 Differential line sum (7..0)
14 Differential line sum (15…8)
15 Differential line sum (23…16)
16 Differential line sum (31…24)
Use these values to focus the camera.
Generally, the greater the sum the greater
the image contrast and better the focus.