Image-displaying device e.g. cathode ray tube display, dithering method, involves filtering one bit data based on frame group conditions to represent one gray scale with another set of bits

摘要

#CMT# #/CMT# The method involves selecting a frame on which dithering is to be performed, and filtering a bit data based on frame group conditions to represent a gray scale with another set of bits. One bit of the latter set is obtained by subtracting N from the data, where N is 2 bits. A dither matrix is selected for the selected frame. A temporal/spatial compensation is performed on the matrix based on lower N bits of the filtered data. #CMT# : #/CMT# An independent claim is also included for an apparatus for performing dithering in an image-displaying device. #CMT#USE : #/CMT# Used for dithering in an image-displaying device e.g. cathode ray tube (CRT) display, printer and thin film transistor (TFT) liquid crystal display (LCD). #CMT#ADVANTAGE : #/CMT# The method filters a bit data based on frame group conditions to represent a gray scale with another set of bits, without any occurrence of saturation at gray scales corresponding to a high level of brightness. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a flowchart illustrating a method of dithering in an image-displaying device.