Higher precision look-up table from lower precision look-up tabl

Details Higher precision look-up table from lower precision look-up tabl Higher precision look-up table from lower precision look-up tabl

1994-12-13

1998-02-17

Bost, Dwayne

Image analysis

Image enhancement or restoration

358504, 358523, 364577, 348674, G06K 940, G03B 300, H04N 1407

Patent

active

057199655

ABSTRACT:
An image capture system comprising a scanner having a 10-bit analog-to-digital converter. The scanner operates within an environment that includes a host computer that is configured to accept 8-bit data. The contrast enhancement of the scanner is improved by applying an improved tonal adjustment on a scanned image. The host computer connected to the scanner provides an 256-value to 256-value look-up table (i.e., the 8-bit tone map) to the scanner. The scanner generates an interpolated 1024-level to 256-level look-up table (i.e., a 10-bit tone map) from the 256-level to 256-level look-up table. The 1024-value to 256-value look-up table is generated by using linear interpolation and extrapolation. The scanner can thus provide better contrast enhancements without having to modify the software running on the host computer.

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patent: 5452112 (1995-09-01), Wan et al.
patent: 5502580 (1996-03-01), Yoda

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