Pixel density converter

Details Pixel density converter Pixel density converter

1994-03-18

1995-08-22

Powell, Mark R.

395129, G06F 1562

Patent

active

054448328

ABSTRACT:
Each one of three different, separate pixel density converters, which are alternative embodiments, operates upon an electrical signal representing successive pixels of an image. The first pixel density signal converter repeats an integration process by adding together multi-valued data representing intensity levels of two adjacent pixels, dividing by two, then repeating for such already integrated pixels to integrate a fixed number of pixels into one pixel, converting the result to a binary signal, the conversion comprising comparing the represented pixel intensity value to a fixed threshold value, and then transmitting a succession of such signals representing a plurality of adjacent data-reduced pixels. The second pixel density converter achieves comparable data reduction in a transmitted signal upon a basis of adding together a fixed number of pixels, more than two, dividing by the fixed number and performing a similar binary conversion. The third pixel density converter is similar to the second except that the fixed number is changed to satisfy the condition that the total of such numbers in a given sequence reaches a required value, the binary conversion successively yielding values upon which a resultant data-reduced signal is based, with the result that an image reproduced from the resultant signal will have reduced moire effect, which can be caused by interference between its pixels.

REFERENCES:
patent: 4682243 (1987-07-01), Hatayama
patent: 4712141 (1987-12-01), Tomohisa et al.
patent: 4941194 (1990-07-01), Shiomura
patent: 5086489 (1992-02-01), Shimura

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