EP 0378780 B1 19940504 - Error propagated image halftoning with time-varying phase shift.
Title (en)
Error propagated image halftoning with time-varying phase shift.
Title (de)
Halbtonbilder mit Fehlerübertragsfortpflanzung mit einer mit Zeit veränderlichen Phasenverschiebung.
Title (fr)
Images en demi-teintes avec propagation d'erreurs avec décalage de phase variant dans le temps.
Publication
Application
Priority
US 29776889 A 19890113
Abstract (en)
[origin: EP0378780A1] The present invention achieves a method of displaying an image which builds upon the error propagation method for mosaic color displays. That method propagates error between elements diagonally for a mosaic color display having diagonal rows consisting of monochromatic elements. In the method of the present invention, called "pel interleaving", the "error" propagated into the first element in the diagonal row changes with each new image or frame processed. More specifically the error propagated into each diagonal's first element increases incrementally with each frame processed until it exceeds the maximum element intensity value, in which case it is started anew by subtracting the maximum value. The incremental increasing of this initial error, in the binary display case, leads to the spatial drift of "on" elements along the diagonals. If all preload values are equally likely, the time integrated ensemble of the displays approaches the exact contone image as the number of displayed images increases. Thus, if the processing is fast, so that the eye integrates a number of displayed images for the same input image, the display perceived using the present image approaches the actual contone of the input image.
IPC 1-7
IPC 8 full level
G06F 3/147 (2006.01); G09G 3/20 (2006.01); G09G 3/36 (2006.01); G09G 5/00 (2006.01); G09G 5/02 (2006.01)
CPC (source: EP)
G09G 3/2059 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0378780 A1 19900725; EP 0378780 B1 19940504; DE 68915145 D1 19940609; DE 68915145 T2 19941117; DE 69007690 D1 19940505; DE 69007690 T2 19941110; EP 0404933 A1 19910102; EP 0404933 B1 19940330; JP H02234192 A 19900917; JP H03503461 A 19910801; JP H0792650 B2 19951009; WO 9008377 A1 19900726
DOCDB simple family (application)
EP 89121390 A 19891118; DE 68915145 T 19891118; DE 69007690 T 19900112; EP 90902525 A 19900112; JP 50285690 A 19900112; JP 605390 A 19900113; US 9000268 W 19900112