Processing of image data supplied to image display apparatus
May 25, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesColor reduction and conversion using an ordinal lookup table Color liquid crystal display device Image processing apparatus for displaying and altering color images Image processing system and its smoothing method for correcting color fog and backlight of a digital image Liquid crystal display Image processing apparatus using an offset correction table enabling interpolation to be performed without conditional jumps Image processing system and its smoothing method for correcting color fog and backlight of a digital image Image processing system Systems and methods for moiré-reduced halftoning Patent #: 6717696 InventorsAssigneeApplicationNo. 09864308 filed on 05/25/2001US Classes:345/88, Color345/600, Color bit data modification or conversion345/605, Change in number of bits for a designated color (e.g., 4 bits to 8 bits, 8 bits to 4 bits)345/101, Data signal compensation in response to temperature358/521, Gradation382/165, Pattern recognition or classification using color345/102, Backlight control382/167, Color correction358/1.9, Attribute control345/522, Graphic command processing709/246, COMPUTER-TO-COMPUTER DATA MODIFYING345/594, Using GUI345/602, Plural look up tables345/590, Gamut clipping or adjustment345/598, Spatial345/592, Transparency (mixing color values)345/591, Color processing in perceptual color space345/595, Expert system or AI345/599, Spatial345/593, Color selection345/601, Using look up table345/596, Dither or halftone345/603, Format change (e.g., NTSC to RGB, RGB to composite, XYZ to RGB)345/604, Color space transformation (e.g., RGB to YUV)345/589, Color or intensity345/597, Color382/162, COLOR IMAGE PROCESSING382/163Drop-out color in image (i.e., color to be removed)ExaminersPrimary: Eisen, AlexanderAttorney, Agent or FirmForeign Patent References
International ClassesG09G003/36H04N005/66 H04N005/202 G09G003/36 AbstractThe technique of the present invention carries out image processing of image data, which are to be supplied to an image display apparatus having a less number of expressible tones than a number of tones included in original image data and a non-linear display characteristic. The procedure of the present invention takes into account the non-linear display characteristic of the image display apparatus and corrects a tone value with regard to each pixel with a look-up table, so as to enhance a tone distribution corresponding to an area of wide intervals of output lightness, while reducing a tone distribution corresponding to an area of narrow intervals of the output lightness. The procedure then carries out a dispersion-type halftoning process for color reduction to convert the corrected tone values to display tone values expressible by the image display apparatus. A plurality of lookup tables is provided corresponding to a plurality of settings for a predetermined condition, such as environmental temperature, affecting the display characteristic of the image display apparatus. The selected lookup table is changeable according to a current setting of the predetermined condition. This technique of the present invention effectively improves the picture quality of resulting displayed images on the image display apparatus. | |
