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| Number | Title | Issue Date |
| 7511857 | Halftoning method and system A combined dot density (FM) and dot size (AM) modulation halftoning method and system produces a halftone in which both the density and size of the dots are modulated. In addition to modulating the dot size and density, the halftoning method can also explicitly cont... | 03/31/2009 |
| 7369276 | Multi-level halftoning providing improved texture uniformity A method for multi-level halftoning an input digital image to form an output digital image which includes a multi-level error diffusion halftoning process incorporating periodic dither signals whose amplitudes are adjusted as a function of the error-diffusion textur... | 05/06/2008 |
| 7355756 | Color electrophotographic apparatus and method of processing an image produced thereby An image reproduction engine which causes toner to adhere to a development region of certain area located at a certain position within dots according to image reproduction data is utilized for image processing, wherein a halftone is expressed by means of halftone sp... | 04/08/2008 |
| 7352493 | Enhancement of glossmark images at low and high densities The present invention relates to expanding the range of image densities over which the manipulation of differential gloss as may be inherent in halftoned images may be achieved. By selectively applying halftones with anisotropic structure characteristics which are s... | 04/01/2008 |
| 7330191 | System for secure text display Techniques for securely displaying text on a display panel involve destroying spatial and temporal correlations in an otherwise uniform visual field. The techniques render the displayed text secure with respect to attempts to copy the text using a video capture devi... | 02/12/2008 |
| 7324241 | Variable data differential gloss images The present invention relates to the segmentation of an image into a main area and a image segment for variable data differential gloss image control. A single color is selected. Two or more different color definitions are created by combining the selected single co... | 01/29/2008 |
| 7315402 | Image forming apparatus and method for selecting an optimal image space frequency for an output image An image forming apparatus includes an image forming device configured to form an output image using at least two or more image space frequencies and an image size acquisition device configured to recognize a size of the output image. A switching device is configure... | 01/01/2008 |
| 7304770 | Reduction of differential gloss with halftoned clear toner A method for reduction of differential gloss as found in halftone image hardcopy prints. The method comprises selecting either a single halftone or employing two halftones: a first halftone having a high apparent gloss characteristic; and a second halftone having a ... | 12/04/2007 |
| 7301675 | Glossmark images with clear toner The present invention relates to creating differential gloss images in clear toner by the manipulation of halftones employed prior to the depositing of the clear toner layer upon a substrate. By selectively applying halftones with anisotropic structure characteristi... | 11/27/2007 |
| 7301676 | Printing method and apparatus, and binary-form dither matrix pattern A method and apparatus for printing a multivalue image in a binary-form output pattern. The printing apparatus employs a binary-form dither matrix pattern which is composed of a greater number of pixels, so that moiré patterns and other artifacts are minimized in p... | 11/27/2007 |
| 7295348 | Processor for image processing, method of processing image using the same, and printer incorporating the same There is generated a virtual tile set which virtually covers color planes of an original image without any clearance or overlap by combination of Penrose-type virtual tiles to be non-periodically provided on the planes. The respective tiles are subjected to raster c... | 11/13/2007 |
| 7242795 | Prospective abnormal shadow detecting system Prospective micro calcification points in a radiation image of an object are extracted on the basis of image data representing the radiation image and clustered into cluster areas. A plurality of areas are set in the radiation image, and fluctuation in size and/or f... | 07/10/2007 |
| 7239429 | Method and apparatus for generating dispersed cluster screen A method for generating a dispersed cluster screen defining a stable environment for printing an image is provided. The method initiates with generating a pattern of cluster centroids. Then a cluster growth sequence is defined. Next, a cluster is grown around the cl... | 07/03/2007 |
| 7233415 | Printing method and apparatus, and binary-form dither matrix pattern A method and apparatus for printing a multivalue image in a binary-form output pattern. The printing apparatus employs a binary-form dither matrix pattern which is composed of a greater number of pixels, so that moiré patterns and other artifacts are minimized in p... | 06/19/2007 |
| 7224488 | Method of correcting threshold array, dot pattern data structure, method of correcting pixel layout of image, and method of determining threshold array for generating image A threshold array having an array of thresholds for reproducing a gradation with a dot pattern as a clustered pattern of dots each made up of one or more blackening pixels is corrected. At least one non-contact point candidate position to be turned into a non-contac... | 05/29/2007 |
| 7193751 | Tag control for runtime glossmarks The present invention relates to the manipulation of differential gloss as may be inherent in halftoned images by utilization of tags. By selectively applying halftones with anisotropic structure characteristics, which are significantly different in orientation whil... | 03/20/2007 |
| 7184053 | Method for processing video data for a display device The invention is related to a new kind of pre-processing for plasma display panel control. The plasma display technology has the drawback of a reduced grey scale portrayal. This is due to the fact that contrarily to CRTs where luminance is approximately quadratic to... | 02/27/2007 |
| 7164499 | Block quantization method for color halftoning A method and apparatus for performing color halftoning using block quantization is disclosed. In one embodiment, the method comprises dividing an input image into a plurality of blocks, clustering pixels in each of the plurality of blocks into a plurality of color g... | 01/16/2007 |
| 7151618 | Halftone dot producing apparatus and halftone dot producing program storage medium There are disclosed a halftone dot producing apparatus in which a phase of halftone dots is freely set up in at least one color plate of the color plates. The halftone dot producing apparatus has an image pixel position deriving section for deriving pixel positions ... | 12/19/2006 |
| 7148999 | Variable glossmark The present invention relates to the segmentation of an image into a main area and a image segment for variable glossmark data. By selectively applying halftones with anisotropic structure characteristics which are significantly different in orientation while remain... | 12/12/2006 |
| 7126721 | Protecting printed items intended for public exchange with glossmarks The present invention relates to protecting printed items intended for public exchange having important informational indicia provided therein. The print items are protected from tampering by providing an informational indicia image as a glossmark. By selectively ap... | 10/24/2006 |
| 7092128 | Application of glossmarks for graphics enhancement The present invention relates to providing a designer with the tools for the manipulation of differential gloss in halftoned images. A special mask layer is provided for the rendering of desired glossmark image data. The desired glossmark image data is used to selec... | 08/15/2006 |
| 7088473 | System and method for effectively implementing a dither matrix for an electronic printer device A system and method for effectively implementing a dither matrix for an electronic printer device may preferably create an improved dither matrix with optimal threshold values for use in a corresponding dither tile. During a matrix populating procedure for assigning... | 08/08/2006 |
| 7079287 | Edge enhancement of gray level images A method and apparatus for processing gray level image data. Gray level image data is subjected to plural separate halftone screen processing to form plural separate halftone processed screen gray level image data. The current pixel is also analyzed for contrast ind... | 07/18/2006 |
| 6982799 | Creating composite page images from compressed data A printhead controller controls printing of a page by at least one printhead. The printhead controller, in use, receives data, in a compressed format relating to the page to be printed, the data including a page description comprising a bi-level black layer and a co... | 01/03/2006 |
| 6972866 | Detecting process neutral colors A method for classifying pixels into one of a neutral category and a non-neutral category inputs a group of pixels within an image into a memory device. A color of each of the pixels is represented by a respective color identifier. An average color identifier is det... | 12/06/2005 |
| 6970273 | Method of tone reproduction with halftone dots, apparatus for outputting halftone plate, halftone plate, and printed material Tone jumps are eliminated in all areas ranging from a highlight area through an intermediate tone area to a shadow area for thereby achieving a smoother tone reproduction. Halftone dots are grown in a circular shape from a halftone percentage of 0% to a first highli... | 11/29/2005 |
| 6943808 | System and method of reducing aliasing in printed images The system and method reduces aliasing which is formed by the patterns that are introduced by the halftone screens used in the printer. The system and method provides halftone-specific anti-alias filters for obtaining optimal effective resolution in printed images. ... | 09/13/2005 |
| 6791718 | Halftone printing with dither matrices generated by using cluster filters A method and system for generating dither matrices for halftone printing. The design of the dither matrices involves modifying a human visual system model cost function to be color-blind and the addition of a cluster cost function. The cluster fluctuation function h... | 09/14/2004 |
| 6778299 | Error diffusion with partial dots method and system A method and system for halftoning images that uses error diffusion with partial dots is provided. First, an input picture element (input pixel) that has a picture level (e.g., gray level) is received. Next, a reproducible gray level is generated based on the gray l... | 08/17/2004 |
| 6724501 | Apparatus and method for dither matrix design for color halftoning using dispersed dot clusters An apparatus and method for dither matrix design for color halftoning using dispersed dot clusters where the dot cluster centers are arranged in a homogeneous and isotropic pattern, in order avoid the moiré effect. The method requires that the size of the array and... | 04/20/2004 |
| 6724499 | Pseudo halftone image expression method There is provided a pseudo-halftone image expression method capable of processing vector data with an excellent image quality and small computational complexity. Gray levels of n×n/m are expressed by varying the number of formed dots within a matrix of n×n dots on... | 04/20/2004 |
| 6710778 | Method for halftoning using a difference weighting function An improved method of digital halftoning using “screens” or dither arrays is provided, including stochastic dither arrays (e.g., stochastic screening). The weakness of ordinary stochastic dithering is its isolated or dispersed dots and the related problems of do... | 03/23/2004 |
| 6667816 | Digital image processing apparatus and method with storage of Non-finishable jobs In a networked printing environment having at least a number of workstations of users, a management unit maintains logic storage spaces in a memory, each allocated to a respective user. Digital data files sent from a user's workstation for printing contai... | 12/23/2003 |
| 6643032 | Marking engine and method to optimize tone levels in a digital output system A halftone cell is composed of a plurality of pixel groupings predefined to correspond to optimal tone level gradations. Selected output pixel groupings vary in number, and in shape of subpixels used from other pixel groupings, in order that successive in... | 11/04/2003 |
| 6128099 | Halftone screen generator, halftone screen and method for generating same A halftone screen generator, a halftone screen and a method for making the halftone screen are described. The halftone screen has a screen angle and rulings that define the theoretical centers of gravity of the halftone dots. The actual centers of gravity... | 10/03/2000 |
| 6088512 | Void-and-cluster dither-matrix generation for better half-tone uniformity Dither thresholds are assigned one after the other to matrix locations in the process of generating a dither matrix used for printer half-toning. The matrix location to be assigned the next threshold is chosen by locating the tightest cluster or largest v... | 07/11/2000 |
| 5978556 | Clustered halftone dot design process An idealized clustered screen is characterized spot clustering which is optimized so that clusters are about the same size and shape as they grow and are approximately equally distanced though an image. Pixels are swapped within the screen to vary its app... | 11/02/1999 |
| 5920682 | Multiple layer cluster dither matrix for reducing artifacts in printed images A technique for reducing image artifacts is described. The technique includes utilizing a clustered-dot dither matrix having a plurality of layers with each of the layers arranged in one of a plurality of complementary patterns within the dither matrix. B... | 07/06/1999 |
| 5884013 | Autotypical screening with optimised dotshape A method for generating a screened reproduction of a multiple tone image comprises the steps of autotypical or amplitude modulation screening the multiple tone image to obtain screened data representing tones of the multiple tone image in terms of halfton... | 03/16/1999 |
