Method and means for scale-changing an array of boolean coded po

Details Method and means for scale-changing an array of boolean coded po Method and means for scale-changing an array of boolean coded po

1979-09-28

1981-07-21

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358287, H04N 100, H04N 104

Patent

active

042801435

ABSTRACT:
Scale-changing method and apparatus is described for converting raster-scanned data received for example from a scanner 2 at a first picture element (pel) resolution to a second lower pel resolution for display for example on a CRT terminal 4. The apparatus includes a scale-changing means 3 which operates on receipt of the image data from the scanner 2 to perform a scale-change operation on the pels, first in the image row direction and then in the image column direction. The row scale-change operation is performed by scale-change projector 5 which functions to replace sub-groups of pels in the input image rows by single pels at its output. The number of pels in the sub-groups are determined by the degree of compression required to convert to the lower pel resolution. The significance of the output bits replacing the sub-groups is determined in accordance with predetermined algorithms having regard to the significance of pels in a selected horizontal `window` of pels which includes the sub-group of pels under consideration. The image data emerging from projector 5, consolidated in the row direction, is further processed by a second scale-change projector 6 which performs the column scale-changing operation. The projector 6 operates in a similar fashion to projector 5 except that in this case sub-groups of pels in the image column direction are replaced by single pels at its output. Again, the size of the sub-groups are determined by the degree of compression required to convert to the lower pel resolution. The significance of the output pels replacing the sub-groups is determined as in the previous step in accordance with predetermined algorithm having regard to the significance of pels in a selected vertical `window` of pels which includes the sub-group of pels under consideration.

REFERENCES:
patent: 3976982 (1976-08-01), Eiselen
patent: 4075663 (1978-02-01), Wellemdorf
patent: 4124871 (1978-11-01), Morrim
patent: 4210936 (1980-07-01), Cimque et al.
patent: 4215414 (1980-07-01), Huelsman

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