leeroy Posted March 12, 2009 Posted March 12, 2009 as title, have seen a cheapo cctv camera with a sensor on the front that switched the cam to bw mode in the dark. but i have just recently got a panasonic outdoor ptz dome, and when this one switches to bw mode something actually covers the lense (you can see whatever it is actualy move acros the lense) is the panny a true day/night cam?
breff Posted March 12, 2009 Posted March 12, 2009 When the camera is in colour mode there is an IR cut off filter in front of the lens, when it switched to b&w the filter moves out of the way allowing IR light through The opinions I express are mine and are usually correct! (Except when I'm wrong)(which I'm not)
james.wilson Posted March 12, 2009 Posted March 12, 2009 as abve true day nights have a motorised ir cut filter that is removed as the chnage to mono mode. Tis is to keep colour detail accurate (ir cut) in colour mode. Cheap nasty cameras just dont have an ir filter at all and all the colours are out. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
DannyTheTech Posted March 13, 2009 Posted March 13, 2009 Although the question has been answered, i thought that i would go into a bit more detail. All CCD's are monochrome and colour is acheived by placing a filter infront of the CCD. The Problem with this is that while you achive colour video you will sacrifice some of the resoloution (hence why all colour cameras are of a lower res than their monochrome counterparts ). The types of colour/mono (or day/night as they are also known) are split by the fact that the system changes between the both by either physically removing the filter (true colour/mono) or by using the DSP chip to apply a software filter. The main problem with using a software applied filter is that the colour filter is still inplace and there for will provide a lower resoloution image. Also the Colour filter will cause problems with infrared lighting as it will not allow IR light to pass correctly. Due to the fact that the true day night have a mechnical process to remove the filter, this usually means that the cameras will be more expensive than "colour kill" systems. So obviously the main diffrence between the units will be the resouloution change and also the fact that a "true" colour mono camera is suited for Applications where IR lighting will be used. Hope this helps. . D
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