Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-12-10
1989-09-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
358464, H01J 4014, H04N 140
Patent
active
048662909
ABSTRACT:
In general, an image reader is provided with an image sensor wherein a plurality of reading devices are disposed in a row so as to be able to read image data of a first line of an original. This image sensor is then moved in the direction perpendicular to the row of the reading devices so as to read image data of the next line. As a result, image data of the original is read in a distributed manner at each of a number of lattice reading points of an original. The image reader of the present invention is provided with a filter which does not allow light of certain frequencies to pass through. The light which is stopped has frequencies exceeding half the spatial frequency of a lattice of the reading points. The image reader inputs through the filter image data from four reading points which are disposed adjacent to each other. An averaged data item, which is averaged in an arithmetic mean manner, from four image data items, is output as an averaged image datum. The image reader also outputs an image data item which is averaged in an weighted mean manner from nine adjacent reading points. This output is obtained by again averaging four adjacent image data, which have been averaged in the arithmetic manner, in the same arithmetic manner.
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Brandley, "Pseudo-Halftone Generation", IBM Tech. Disc. Bull., vol. 20, No. 4, 9/77, p. 1300.
Matsushita Electric - Industrial Co., Ltd.
Messinger Michael
Nelms David C.
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