Boots – shoes – and leggings
Patent
1984-11-29
1987-06-30
Krass, Errol A.
Boots, shoes, and leggings
340723, 340739, 340747, 364518, G06F 1572, G09G 106
Patent
active
046775757
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to an apparatus in a computer-controlled presentation system for generating pictures on a presentation screen provided with a raster, consisting of m.n. (i.e., m.times.n) picture elements where m is the number of lines in the picture and n is the number of picture elements per line.
BACKGROUND
Known methods of generating pictures on a presentation screen usually involve the picture being represented by picture's elements which are intermediately stored in a memory having m.n memory addresses before presentation, which results in large demands on memory capacity and high demands on the computing capacity in picture generators.
SUMMARY OF INVENTION
The present invention combines the low computing and memory capacity requirements associated with vector representation of pictures with large information density. There is furthermore enabled that complex pictures can be drawn with luminance equalization by limitedly long vector segments being able to be decoded in their entirety by pre-defined tables. Surfaces (area of the picture having uniform luminance and colour) may be represented by illumination and extinguishment edges, which is an advantage from the aspect of memory and computing capacity.
In achieving the above and other objects of the invention there is provided an apparatus for a computer controlled presentation system for generating images on a display screen divided into a raster comprising m.times.n picture elements wherein m equals the number of lines and n equals the number of picture elements per line and wherein each image is built up from a cohesive open or closed chain of a first or a second type of vector segment respectively each segment representing a symbol part or an edge of a surface, the vector segment is being stored in a plurality of picture generators each of which sends a signal representing the parameters of each vector segment.
In further accordance with the invention, the apparatus comprises a segment memory having an input and receiving at said input the signals from the picture generators, incoming data for the vector segment to the segment memory being arranged to be grouped in a linked list assigned to a given raster line such that when the memory is read out, the memory sends output signals representing segment data for all vector segments which are associated with a given raster line and successively for subsequent raster lines in a picture. Furthermore included is a decoding unit coupled to and receiving the output signals from the segment memory for carrying out in response to the output signals a decoding to picture elements in a given raster line for the first type of vector segment or for decoding illuminate and extinguish points in a given raster line for the second type of vector segments, a first output signal corresponding to the first type of vector segment being sent for denoting a starting point on a given raster line, at least for one picture element on the line, and a magnitude determining luminance of the picture element, a second signal being sent corresponding to the second type of vector segment for denoting the starting point for the picture element determining the edge of a desired surface and whether this edge constitutes an illuminate or extinguish edge.
Furthermore included in the apparatus of the invention as will be explained in detail hereinafter is a dot memory receiving the first output signal and including two memory units for storing luminance and colour information from the first output signal for all picture elements in two successive raster lines, reading into the first memory unit being arranged for performance simultaneously with reading out from the second memory unit and reading into the second memory unit being arranged for performance simultaneously with reading out from the first memory unit, said dot memory delivering an output signal representing luminance and colour information for each picture element of each raster line.
Furthermore included in the apparatus of the inventio
Krass Errol A.
Telefonaktiebolaget LM Ericsson
Teska Kevin J.
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