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
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
