Boots – shoes – and leggings
Patent
1974-10-11
1978-04-11
Boudreau, Leo H.
Boots, shoes, and leggings
358296, 358298, 346 78, H04N 128, H04N 104
Patent
active
040842592
ABSTRACT:
A dot matrix recording system records a wide range of gray levels without compromising recording resolution. Resolution is maintained by using a relatively small dot matrix, preferably a 2 by 2 matrix, for representation of the graphic information at a point within an image being reproduced. When adjacent points within the image have the same optical density, then the matrix representation thereof is altered from point to point so as to produce a matrix of effectively increased size. The larger matrix or matrix group may comprise 4 of the 2 by 2 matrices positioned in a square arrangement. Thus when two horizontally adjacent points within an image have the same optical density and are situated immediately above two other points having the same optical density, then the four-point area is represented by a matrix group comprising a total of 16 matrix cells arranged in a 4 by 4 pattern. Such an arrangement permits recording a gray scale comprising 17 gray levels from white to black, while preserving the resolution afforded by the smaller 2 by 2 matrix. A further gray scale extension is obtained by a "special case" technique wherein the 2 by 2 matrices are combined into a rectangular matrix group which is 2 matrices high by 4 or 6 matrices wide for a total of 32 or 48 matrix cells.
REFERENCES:
patent: 3604846 (1971-09-01), Behane et al.
patent: 3681650 (1972-08-01), Koll
patent: 3689693 (1972-09-01), Cahill et al.
patent: 3723646 (1973-03-01), Behane et al.
patent: 3757036 (1973-09-01), Libbet et al.
patent: 3806641 (1974-04-01), Crooks
Data Corporation Technical Note-DTN-71-4, "Data Digital Graphics Generator, Models BP-7004 & BP-7005, July 1971, pp. 1-13, 29-35.
Klensch et al., "Electronically Generated Halftone Pictures", RCA Review, Sept. 1970, pp. 517-533.
Brunswick Arthur R.
Cahill Lysle D.
Boudreau Leo H.
The Mead Corporation
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