I would like to learn more about security cameras. I would like to know about the hardware and chipsets that goes into them. I would also know what to look for for a quality CCTV camera. Here is general faq I found on ebay. Not sure how correct it is. Any website that can teach me more about CCTV camera technology?
FAQs
1. CMOS vs. CCD - Most cameras sold are using CMOS sensors, unless specifically specified as CCD. CCD technology is better and produces sharper resolution color reproductions. E.g. mobile phones are using CMOS sensors, while an expensive digital camera uses CCD sensors. (Color CMOS sensors requires minimum 3.0lux while CCD sensors requires just 0.5lux)
2. 3.6mm lens vs. 6mm lens - Common camera (cheaper) uses 6mm lens. A 3.6mm lens provides a much wider view for better coverage of surveillance area.
3. 1/3 vs. 1/4 CCD sensors - 1/3 CCD sensors are able to reproduce a wider and larger area coverage due to the larger sensor. It is also more expensive.
4. SONY vs. Sharp CCD - In surveillance equipments, these two branded CCD sensors are the most commonly used in the market. SONY branded CCD had been shown to provide sharper image resolution, better performance in low light conditions. SONY branded sensors is also more expensive.
5. LED Diodes - LED diodes will project IR rays and these IR is detectable by the camera sensors. Some manufacturers supply LED Diodes that is invisible to naked eyes, while some may show tinge of red. Typically, the more powerful the diodes, the wider the distance of visibility in dark conditions. IR diodes is most very effective when used by black/white cameras as these cameras required low lighting conditions, and is highly recommended for surveillance activities even when the lights are switched off.
6. Installed Distance - Using good quality cables, sufficient DC power supply will ensure stable image quality. Otherwise, a video repeater may be used at various intervals of the cable points.
7. Camera Housings - Most indoor camera housings are using a dome or easy-install 360degree rotational camera. For outdoor use, weather-proof cameras are recommended. No matter what type of camera housing is used, the camera specifications provided in Qn.1 to Qn.4 will not affect the camera performance. PTZ enabled housing can also be considered for professional use.
8. Remote Monitoring - Remote Monitoring with internet browser (Microsoft IE) is possible with the right DVR (HDD stand-alone) or PC DVR. Internet Broadband and Static IP address is required here. It is also possible with a Dynamic IP address but user will require the necessary IT skills with DNS Servers.
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