10
However, if the green lines appear narrower or
wider than the real crop rows check the
“crop
size
” selected in the “set up” screen and change if appropriate. If this does not resolve the
problem, it may be that the camera height (measured from centre of lens to ground level) does not
match the figure displayed in the “set up” screen. The best solution is to measure the correct
position and move the camera accordingly. A less accurate, but sometimes satisfactory
alternative,
is to adjust camera height until the “picture” looks correct as illustrated below.
If the camera is too low, then the template will appear narrower
than crop rows. In this case raise the camera.
If the camera is too high, then the template will appear wider
than crop rows. In this case lower the camera.
If the template matches mid screen, but not at the top or bottom, check that the implement is level.
If it is camera inclination angle may need adjusting. Again the best solution is to make careful
measurements and adjust accordingly. This may be done as follows.
Go into the “set up” screen
and make a note of a distance called “look ahead”. Return to the working screen and press Sk5
labelled “manual”. Purple cross hairs will appear in the image. Now mark a point on the ground
directly below the camera lens (ideally using a plumb bob). From that point measure forward along
the ground and place an object at the “look ahead” distance. When viewed on the screen the
object should now coincide with the cross hairs intersection in the image centre. If it does not
camera inclination should be adjusted until it does.
Again a less accurate, but sometimes satisfactory alternative is to adjust camera inclination until
the “picture” looks correct as illustrated below.
If template lines appear narrower than crop rows at the top of
the image but wider at the bottom, then the camera is inclined
down too far. In this case rotate the camera up so it views
further ahead.
If template lines appear wider than crop rows at the top of the
image but narrower at the bottom, then the camera is
inclined up too far. In this case rotate the camera down so it
views less far ahead.
Good tracking will only be achieved if template lines are centred on all of the rows being tracked.
Note
Remember to tighten any bolts loosened in the process of adjustment.
