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Progressive scanning (alternatively referred to as noninterlaced scanning) is a way of displaying, storing, or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to interlaced Video used in traditional analog television systems where only the odd lines, then the even lines of each frame (each image called a Video field) are drawn alternately, so that only half the number of actual image frames are used to produce Video.

The system was originally known as "sequential scanning" when it was used in the Baird 240 line television transmissions from Alexandra Palace, United Kingdom in 1936. It was also used in Baird's experimental transmissions using 30 lines in the 1920s.[2]
progressive scanning is universally used in computing.

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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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