Method and apparatus for converting floating-point pixel values

Details Method and apparatus for converting floating-point pixel values Method and apparatus for converting floating-point pixel values

1994-12-16

1996-06-18

Zimmerman, Mark K.

Boots, shoes, and leggings

364745, 364748, G06F 103

Patent

active

055287417

ABSTRACT:
Method and apparatus for generating integer pixel values from floating point values using table lookup. The method includes the steps of (a) providing a floating-point representation of a pixel value; and (b) applying the floating-point representation as an index into a lookup table. The lookup table includes a memory device having a plurality of entries. Each of the entries is uniquely indexed by one value of a floating-point representation of a pixel value, and each of the entries stores a corresponding integer representation of the pixel value. A third step (c) outputs from the lookup table the integer representation of the pixel value that corresponds to the applied floating-point representation. It is shown that only a sub-set of the entire floating-point representation need be employed as a table index value, specifically the sign bit, the exponent, and a portion of the mantissa.

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