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Network cameras compared with analog cameras

IP cameras or network cameras are analogue or digital video cameras, plus an embedded video server having an IP address, capable of streaming the video (and sometimes, even audio).
Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than CCTV analogue cameras are possible. A typical analogue CCTV camera has a PAL (768×576 pixels) or NTSC (720×480 pixels), whereas network cameras may have VGA (640×480 pixels), SVGA (800×600 pixels) or quad-VGA (1280×960 pixels, also referred to as "megapixel") resolutions.
An analogue or digital camera connected to a video server acts as a network camera, but the image size is restricted to that of the video standard of the camera. However, optics (lenses and image sensors), not video resolution, are the components that determine the image quality.
Network cameras is a semiconductor imaging device, which has a high sensitivity, anti-glare, distortion, small size, long life, anti-vibration and so on. CCTV camera security systems ,which the generation of the image is mainly from the     CCD camera at present, CCD is a short for charge-coupled device (Charge Coupled Device), it can transfer the light to charge and store it and can also remove the stored charge to change the voltage, so it is the ideal camera components, CCD camera are widely used with its characteristics, such as small size, light weight, unaffected by magnetic fields, anti-vibration and shock and so on.
Network cameras can be used for very cheap surveillance solutions (requiring one network camera, some Ethernet cabling, and one PC), or to replace entire CCTV installations (cameras become network cameras, tape recorders become DVRs, and CCTV monitors become computers with TFT screens and specialised software. Digital video manufacturers claim that turning CCTV installations into digital video installations is inherently better).
There continues to be much debate over the merits and price-for-performance of Network cameras as compared to analog cameras. Many in the CCTV industry claim that many analog cameras can outperform network cameras at a lower price.

This article from

http://www.indyarocks.com/blog/1444901/Network-cameras-compared-with-analog-cameras