pdxkris 0 Posted November 2, 2009 First, thanks to all of you for this place! I've spent many, many hours in the last week reading up on CCTV, and by far I've gotten the most valuable information on this forum! Is there an existing area either on this site or elsewhere on the web where I can go in order to see sample output of 420+ TVL images, ideally in both daylight and low light, at their full non-reduced size? If not, would any of you kind folks care to upload some? I've seen a number of sample images here and there, but I often get the feeling their size has been reduced before posting in order to save everybody bandwidth. What I'd like to see is the quality I could expect to receive on a mid-range CCTV setup. I'm having a heck of a time deciding if high res CCTV would satisfy me, or if I should continue saving until I can afford to go megapixel. Thanks, Kris Share this post Link to post Share on other sites
Soundy 1 Posted November 2, 2009 I doubt they're resized, for the most part: most larger ones will be closer to 640x480 (VGA) to 704x480 (4CIF/D1) , and many will be only 352x240 (CIF). Those are the standard capture resolutions used in analog video. The largest analog-capture image you'll see is 740x480, as that's pretty much the limit of most analog-capture hardware. As for whether they're 420TVL or better, there are many other factors that have a far larger effect on image quality: lens quality; lens aperture; focus accuracy; shutter speed; clarity of housing glass or plastic, if any, in front of the lens; quality of the sensor; quality of the processing circuitry... Once you get the signal out of the camera, final image quality will also depend on capture resolution; quality of analog/digital conversion; compression codec used; compression level used; recompression, if any; post-processing, if any... With variations on all these factors, I could show you pictures from a 320TVL camera that look far better than something from a 520TVL camera... Share this post Link to post Share on other sites
