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Abstract

An image synthesizer to which outline point information of an image is supplied from an image information supply source. This apparatus comprises an outline point information storing means for successively writing and storing outline point information which consists of the positions of pairs of right and left outline points at which the outline of a figure for CRT display intersects respective horizontal scanning lines and additional data on this figure in the order of priority in respective horizontal scanning memory areas which are provided in correspondence with the respective horizontal scanning lines, a line processor circuit for successively reading the outline point information in synchronization with a horizontal scanning signal from the horizontal scanning memory area which corresponds to a vertical scanning position, and a line buffer having memory areas of a number which at least corresponds to the number of pixels for one horizontal scanning, the additional data contained in the outline information which has been read from the horizontal scanning memory area being successively written in the memory areas which are defined by the corresponding pair of outline points. Whenever a horizontal scanning signal is output, an image signal for horizontal scanning is synthesized and output through the line buffer.

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First Claim