OV9281 camera with Nvidia jetson orin nano
I have a normal light monochrome image at a resolution of 1280x720@80fps.
When I set 640x400@240fps the image becomes very dark, how can I fix this?
Command to run:
ffmpeg -f video4linux2 -video_size 640x400 -framerate 240 -i /dev/video0 -vf vflip video.mp4
image is dark
Im try change this options:
v4l2-ctl -d /dev/video0 --set-ctrl=exposure=50000 --set-ctrl=analogue_gain=1500
But this didnt produce any visible effect.
Hello,
Regarding the image appearing darker when shooting at high frame rates like 240 FPS with the OV9281 camera, this is a common and expected phenomenon. The primary reason for this is the shorter exposure time inherently linked to high frame rates.
Frame Rate (FPS - Frames Per Second) refers to the number of individual images the camera captures every second. For example, 240 FPS means the camera is capturing 240 distinct pictures within one second.
To capture so many frames in such a short period, the exposure time for each individual frame must be very short. Theoretically, the maximum exposure time for each frame cannot exceed 1/240th of a second (which is about 4.16 milliseconds). In practice, due to sensor readout times and other overhead, the effective maximum exposure time is often even shorter.
Exposure time dictates how long the camera’s sensor (CMOS in this case) is exposed to light to capture each frame.
The shorter the exposure time, the less total light the sensor can gather for that frame.
