N-bit wide parallel rotation algorithm

Details N-bit wide parallel rotation algorithm N-bit wide parallel rotation algorithm

1991-12-23

1994-11-15

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

395137, 345126, G06K 932

Patent

active

053656016

ABSTRACT:
A circuit for rapidly rotating a digital image through 90 or 270 degrees utilizing memory implemented from ordinary 4-bit wide memory devices. This pipelined circuit transfers the image through a page buffer and a band buffer in a series of memory accessing, shining and reordering steps which converts all vertical lines to horizontal lines and all horizontal lines to vertical lines without requiring the use of a parallel to serial conversion.

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patent: 4806920 (1989-02-01), Sawada
patent: 4837845 (1989-06-01), Pruett et al.
patent: 5068904 (1991-11-01), Yamazaki
patent: 5111192 (1992-05-01), Kadakia
patent: 5124692 (1992-06-01), Sasson

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