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Interlaced Video is a technique for doubling the perceived Frame rate of a Video display without consuming extra bandwidth. The interlaced signal contains two fields of a Video frame captured at two different times. This enhances motion perception to the viewer, and reduces flicker by taking advantage of the phi phenomenon.

This effectively doubles the time resolution (also called temporal resolution) as compared to non-interlaced footage (for Frame rates equal to field rates). interlaced signals require a display that is natively capable of showing the individual fields in a sequential order. Only CRT displays and ALiS plasma displays are capable of displaying interlaced signals, due to the electronic scanning and lack of apparent fixed-resolution.

interlaced scan refers to one of two common methods for "painting" a Video image on an electronic display screen (the other being progressive scan) by scanning or displaying each line or row of pixels. This technique uses two fields to create a frame. One field contains all odd-numbered lines in the image; the other contains all even-numbered lines.

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What is Video Standard?

Different areas of the world use different video standards. North America uses NTSC, Europe uses PAL and SECAM, South America uses PAL-M, PAL-N, PAL and NTSC. Almost every area of the world has a mixture of video standards. If your CCTV/recorder/camcorder support multi-systems, you can use either PAL or NTSC camera. With a multi-system video recording format, you expect an PAL tape to be reproduced as a standard digital PAL signal, and the same machine if fed with a NTSC tape will reproduce it as a standard digital NTSC signal. A multi-system interface recorder can also be expected to make a perfectly normal PAL recording of an PAL input signal, and a perfectly normal NTSC recording of a NTSC input signal. A NRSEC representative can provide professional advice in selecting the correct Surveillance security camera.

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