Difference between revisions of "Focusing the video lens"
Martin Cupak (talk | contribs) m (typos fix →Run freeture in to display currently captured video live on screen) |
Martin Cupak (talk | contribs) m (typo fix and minor improvement) |
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freeture -m 2 --display -g GAIN -e EXPOSURE_TIME | freeture -m 2 --display -g GAIN -e EXPOSURE_TIME | ||
| + | |||
| + | ''Note: hit ESC key in the console where the command was started to stop - not in the window with the vodea from camera.'' | ||
Use GAIN (0 .. 29.99) and EXPOSURE time (0-33000 in microseconds; max exposure time is driven by frame rate 30Hz) appropriate for the current lighting conditions. | Use GAIN (0 .. 29.99) and EXPOSURE time (0-33000 in microseconds; max exposure time is driven by frame rate 30Hz) appropriate for the current lighting conditions. | ||
| − | In full screen/enlarged mode, the image update may be slow or freeze. This is related to the CPU load and I/O over USB load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above | + | In full screen/enlarged mode, the image update may be slow or freeze. This is related to the CPU load and I/O over USB load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above command if that happens and zoom in only partially or zoom 1:1, but shrink the window. |
| − | A tiny hex key (size | + | A tiny hex/allen key (size 0.6 mm) is needed to loosen the DFNEXT's Fujinon fish-eye video lens focus fixing bolts and to tighten them again when focused. There are 3 of these tiny bolts - to access them, the lens needs to be temporarily removed from the camera enclosure (undo the flange bolts from top of the camera system box with M7 spanner). |
''Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0. | ''Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0. | ||
Revision as of 03:21, 7 April 2022
This page describes how to focus FUJINON video camera lens in DFNEXT camera systems (Point grey / FLIR digital cameras) using freeture video capture software.
Contents
[hide]Stop the freeture SW running as service
systemctl stop freeture.service
Run freeture in to display currently captured video live on screen
Login as user which is not root locally (keyboard + monitor + mouse needed).
Start windows manager
startx
Start terminal. The following commands are to be executed in x-terminal.
Switch user to root may be needed
su - root
Run freeture, zoom in, set window with video full screen or enlarge it to se the focus is sharp:
freeture -m 2 --display -g GAIN -e EXPOSURE_TIME
Note: hit ESC key in the console where the command was started to stop - not in the window with the vodea from camera.
Use GAIN (0 .. 29.99) and EXPOSURE time (0-33000 in microseconds; max exposure time is driven by frame rate 30Hz) appropriate for the current lighting conditions.
In full screen/enlarged mode, the image update may be slow or freeze. This is related to the CPU load and I/O over USB load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above command if that happens and zoom in only partially or zoom 1:1, but shrink the window.
A tiny hex/allen key (size 0.6 mm) is needed to loosen the DFNEXT's Fujinon fish-eye video lens focus fixing bolts and to tighten them again when focused. There are 3 of these tiny bolts - to access them, the lens needs to be temporarily removed from the camera enclosure (undo the flange bolts from top of the camera system box with M7 spanner).
Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0.
Stop freeture
By pressing [Esc] in the terminal window where it was started.
Start the freeture SW running as service again
systemctl start freeture.service
