Vertical Video Lines in Low Light?

[solarblast]

I have a CCTV video camera <http://www.hicam.co.kr/> that I use for low light applications. I can see vertical lines on the left side of the image, and I'm sure they go all away across. In fact, if I take dark frame exposures and stack them, they can be seen. Any idea what they are?

[harley2ride]

When are you seeing the lines? When played back on the camera? When played on the PC? When burned to dvd?

[solarblast]

Good question. I just realized the complexity of what happens. The process that produces the final image (jpg) is really a sum of up to 200 frames. The range is likely 100 to 200 frames. However, it's a simple summing of the 640x480 frames. I believe the average is taken before producing the final image to convert to jpb. Usually, I view the jpg image, but ...

However, I can see the same vertical lines when I take a raw dark frame, which is summed exactly over 200 frames and then averaged. The result is a raw image of 16-bit words. When displayed the vertical lines are apparent. The dark frames are produced by covering the lens and camera with thick dark felt, and are taken at night.

I can produce a single frame, and I do believe I see them even there. I'll check it out.