EP 0161175 B1 19880817 - DEVICE FOR MODIFYING THE ASPECT OF PICTURE ELEMENTS IN THE SCREEN OF A GRAPHICAL DISPLAY TERMINAL
Title (en)
DEVICE FOR MODIFYING THE ASPECT OF PICTURE ELEMENTS IN THE SCREEN OF A GRAPHICAL DISPLAY TERMINAL
Publication
Application
Priority
FR 8406052 A 19840417
Abstract (en)
[origin: US4692759A] An apparatus for modifying the appearance of the points of an image on the screen of a graphic image display console comprising a graphic memory storing all the points of the screen interposed between the screen and the display console and a control processor. The graphic memory is organized in words of n bits, each bit is representative of the state of a point of the image and has a value 1 or 0 depending on whether the point which it represents in the image is visible or merges with the background of the image. An attribute memory contains the attributes of each of the image points. The device also comprises a decoder for selecting a bit from each word read out from the graphic memory. A modification circuit is connected to the decoder, to the attribute memory and to the processor for modifying each attribute of the point corresponding to the bit selected of a word by means of modification bits supplied by the processor and for storing each modified attribute in the attribute memory. A reformation circuit is coupled to the modification circuit, to the decoder and to the graphic memory for reconstructing the modified word and for storing it in the graphic memory.
IPC 1-7
IPC 8 full level
G09G 5/30 (2006.01); G09G 5/393 (2006.01)
CPC (source: EP US)
G09G 5/30 (2013.01 - EP US); G09G 5/393 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0161175 A1 19851113; EP 0161175 B1 19880817; DE 3564501 D1 19880922; FR 2563024 A1 19851018; FR 2563024 B1 19860530; US 4692759 A 19870908
DOCDB simple family (application)
EP 85400734 A 19850412; DE 3564501 T 19850412; FR 8406052 A 19840417; US 72335985 A 19850415