Digital video
Video cameras come in two different image capture formats: interlaced and progressive scan. Interlaced cameras scan an image in alternating sets of lines: the odd-numbered lines are scanned at one point in time, and then the even-numbered lines are scanned one clock tick later, then the odd-numbered lines are scanned again one clock tick later, etc. The set of odd-numbered lines or the set of even-numbered lines is referred to as a field, and a consecutive pairing of two fields of opposite parity is called a frame. Similarly, the set of all lines of a progressive scan image is also called a frame. Interlaced video captures twice as many fields per second as progressive video does when both operate at the same number of frames per second. Stills from interlaced video can show some artifacts, so deinterlacing is required in those cases. Progressive scan camcorders tend to be significantly more expensive than interlaced ones with the same frame rate and number of samples per frame.read more at http://en.wikipedia.org/
posted by Azure Production @ 4:29 PM
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