(57) Disclosed is a method and system of encoding data representing knots on an outline
loop defined relative to a coordinate plane, for producing a display image of said
outline and decoding responsive to the interrelationship of said knots on said outline
loop, and imaging said outline loop responsive to said decoded data involving selecting
sets of coordinates on said outline loop, to represent said knots, establishing a
successive order of said knots, encoding said knots in a data order indicative of
said knot order. In the method a complete information set is encoded of data indicative
of the coordinate distances and interknot angles between adjacent knots. The relative
positions of successive knots are compared to at least a first interknot criterion
responsive to the comparing. When compared, the method further comprises producing
a first indication that a set of said successive knots is within said criterion, or
ii) producing a second indication that a set of said successive knots is outside said
criterion, and i) responsive to said first indication imaging said outline loop in
the form of a smooth continuous curve, or ii) responsive to said second indication,
imaging said outline loop in the form of a straight line, between said set of successive
knots. Further disclosed is the encoded data representing the knots on an outline
defined relative to a coordinate plane and decoded for use in adisplay process to
produce images of said outlines represented by said encoded data involving selecting
sets of coordinates on said outline, to represent said knots, establishing a successive
order of said knots, encoding said knots in a data order indicative of said knot order,
by encoding a complete information set of data providing a control code indicative
of either i) the coordinate locations of said knots or ii) a knot's direction relative
to others of said knots or iii) a predetermined shape of said outline between a pair
of said knots or iv) data indicative of the shape of said outline at a knot, or v)
providing data indicative of the coordinate distances between adjacent knots decoding
said complete information sets in a decoding order related to said data order, responsive
to said complete information set being indicative of the coordinate distances between
adjacent knots, producing an image of a smooth continuous curved outline or a straight
line between said adjacent knots or responsive to said complete information sets being
indicative of a control code as set forth in i), ii), iii), or iv), producing an image
of a smooth continuous outline or a straight line according to the said coordinate
locations of said knots relative to adjacent knots in said successive knot order or
producing an image of said outline being smooth at respective knots or being sharp
and forming cusps at respective knots.
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