rectangular pixel


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rectangular pixel

A non-square pixel used on TV screens. Pixels used in the North American TV standard (NTSC) are slightly wider than they are tall (12:11 aspect ratio). Pixels in the PAL and SECAM systems used throughout the world are slightly taller than they are wide (10:11 ratio).

Computer screens use square pixels. Thus, when the computer is used to create menus and graphics for DVDs, an adjustment has to be made. If video and image editors do not provide automatic compensation, the graphics artist or video editor must compensate manually. For example, a 720x540 frame might be used for graphics creation, but it is scaled down to 720x480 to output to DVD or 720x486 to output to the D1 format. See DVD and D1.
References in periodicals archive ?
Therefore when using an integral image, any rectangular pixel sum can be calculated with only four lookups, two subtractions and one addition.
Another system that performs data access at the pixel level is AutoMouse, developed by Kakuya Yamamoto, a researcher in Kyoto University in Japan; it searches the screen for rectangular pixel patterns and click anywhere within a pattern [9].
The BCM7014 chip - a 2D/3D graphics accelerator - also includes an NTSC analog decoder and NTSC/PAL video encoder, and converts the aspect ratio of computer-based square pixel images to the ITU-standard rectangular pixel aspect ratio of standard televisions without loss of picture quality.

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