Manipulation of run-length encoded images

Details Manipulation of run-length encoded images Manipulation of run-length encoded images

1987-09-21

1988-12-20

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

340727, 3582613, 382 46, 382 60, G06K 930, G06K 948

Patent

active

047929812

ABSTRACT:
A method and apparatus for manipulating run-length encoded rasterized images. Sizing, slanting, rotating or otherwise transforming an image outline to a new orientation is accomplished without converting image information into a bit map or discrete pixel format. An image outline is characterized in terms of visible and invisible vectors along an input raster scan line by relating run-lengths in a previous input scan line with run-lengths in a current input scan line. The resulting vector characterization allows determination of crossover points on output raster scan lines for the manipulated image by means of transform coefficients. Memory bins store these crossover points, and these bins are sorted to construct a new run-length encoded image outline.

REFERENCES:
patent: 3142818 (1964-07-01), Holt
patent: 4271476 (1981-06-01), Lotspiech
patent: 4516173 (1985-05-01), Abe et al.
patent: 4562484 (1985-12-01), Rallapalli et al.
patent: 4573201 (1986-02-01), Hashiyama et al.
patent: 4590606 (1986-05-01), Rohrer

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