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Glossary Digital Television / Term

Dynamic Rounding

The intelligent truncation of digital signals. Some image processing requires that two signals are multiplied, for example in digital mixing, producing a 16-bit result from two original 8-bit numbers (see: Byte). This has to be truncated, or rounded, back to 8-bits. Simply dropping the lower bits can result in visible contouring artifacts especially when handling pure computer generated pictures.

Dynamic Rounding is a mathematical technique for truncating the word length of pixels, usually to their normal 8-bits. This effectively removes the visible artifacts and is non-cumulative on any number of passes. Other attempts at a solution have involved increasing the number of bits, usually to 10, making the LSBs (least significant bit) smaller but only masking the problem for a few generations.

Dynamic Rounding is a licensable technique, available from Quantel and is used in a growing number of digital products both from Quantel and other manufacturers.

Permanent link Dynamic Rounding - Creation date 2020-05-31


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