Soft copy display of facsimile images

Details Soft copy display of facsimile images Soft copy display of facsimile images

H - Electricity

04

N

375/4

H04N 1/40 (2006.01) G06T 3/40 (2006.01) G09G 5/395 (2006.01) H04N 1/387 (2006.01)

Patent

CA 1274025

SOFT COPY DISPLAY OF FACSIMILE IMAGES ABSTRACT OF THE DISCLOSURE Digital data defining images are stored in a multi- plane buffer. The buffer may store plural images by restricting data corresponding to an image or image portion to less than half the bit planes of the buffer. An image is displayed by reading data from the buffer and selectively passing only a portion of the data read to a display. The data defining the images may be converted from facsimile (single bit per pixel) to grey scale format (multiple bits per pel) before being written to the buffer. The conversion relies on a table storing data definitive of the effect, on the image, of a facsimile transi- tion (1/0 or 0/1) as a function of the location or the transition. Conversion from facsimile to grey scale is effected by examining the facsimile data for data transition and summing the effect of each of the transitions to convert a segment of facsimile data to grey scale data. A system is also disclosed for rapidly converting an image in run-end form to a reduced-resolution gray-tone image.

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