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Progressive scanning (line doubling)

In the U.S., standard definition televisions are made up of 480 lines. That’s fine for DVD which natively outputs at that resolution, but high definition televisions can have 720 or 1,080 lines, more than double a standard definition set. In order to fill up the "extra" lines to display on a high definition TV, television makers introduced the concept of "line doubling" which makes intelligent guesses about what the "missing" lines should look like. Progressive scanning was then developed to present a smoother image by displaying each line sequentially instead of in alternate order as interlaced scanning provides. If your DVD player and your television both support progressive scanning, the resulting image should be smoother and more detailed than if interlaced scanning is used.

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