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"What, sir, would you make a ship sail against the wind and currents by lighting a bonfire under her deck? I pray you, excuse me, I have not the time to listen to such nonsense."
Napoleon Bonaparte ; When told of the Robert Fulton steamboat
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| Number | Title | Issue Date |
| 8270031 | Halftone mechanism A printing system is disclosed. The printing system includes an image processor to rasterize a received print job and to perform a halftone by comparing a first threshold value from a threshold matrix to a first image component sample, comparing the first threshold ... | 09/18/2012 |
| 8023154 | Image output system for outputting image based on information of number of dots to be formed in predetermined area The image output system of the invention collects a preset number of adjacent pixels to one pixel group to divide a number of pixels constituting an image into multiple pixel groups and specifies a pixel group tone value as a representative tone value of each pixel ... | 09/20/2011 |
| 8004720 | Method for adaptively screening continuous tone originals The invention relates to printing, to facsimile and publishing techniques, in particular to picture reproducing systems capable to form two optical parameter levels, only. Said invention makes it possible to increase a fine detail reproduction accuracy, in particula... | 08/23/2011 |
| 7830553 | Image output system for outputting image based on information of number of dots to be formed in predetermined area The image output system of the invention collects a preset number of adjacent pixels to one pixel group to divide a number of pixels constituting an image into multiple pixel groups and specifies a pixel group tone value as a representative tone value of each pixel ... | 11/09/2010 |
| 7751088 | High-image-quality halftone process This invention provides a method for generating a dither matrix includes: setting an evaluation function for calculating an evaluation value of the dither matrix; providing a dither matrix as an initial state which stores in respective elements each of a plurality o... | 07/06/2010 |
| 7733535 | Method and apparatus for image manipulation via a dither matrix Efficiently processing contone image data by determining one or more characteristics of the image data and using these characteristics to manipulate the dither matrix so that the printed image is enhanced. ... | 06/08/2010 |
| 7719722 | System and method of halftoning for multi-pass rendering A system and method for halftoning for multi-pass rendering of an image in which different pixel locations are rendered in each pass which reduces the effects of inter-pass mis-registration errors. The method of halftoning includes restricting a substantial majority... | 05/18/2010 |
| 7710606 | Image processing method, printer driver, image processing apparatus, image forming apparatus and image forming system An image processing method processes image data to be output to an image forming apparatus that is capable of making a two-way recording to form an image on a recording medium by recording in a forward path and a return path of a scan by an ink-jet recording head. T... | 05/04/2010 |
| 7660017 | Image processor, image processing method and image processing program An image processor for converts input grayscale values into output grayscale values having two or more grayscales by dividing an input image into pixel groups each including pixels and applying a dither matrix to each pixel group a center of gravity position of the ... | 02/09/2010 |
| 7499198 | Threshold value matrix, image processing apparatus, image forming apparatus and printer driver A threshold value matrix is used for converting a multi-level image data into a plural-level image data which represents a dot pattern by a smaller number of gradation levels than the multi-level image data, and comprises threshold values used for making a dot repre... | 03/03/2009 |
| 7492483 | Threshold matrix, a method of generating the same, and a method of assigning the same The number of pixels of a dot of a minimum size, a pattern frequency of an intermediate tone, the number of new dots of the minimum size at each dot percentage are determined. Then, thresholds in the threshold matrix are determined so that the optimum dot pattern at... | 02/17/2009 |
| 7443543 | Image processing apparatus and image processing method A smoothing process is performed on image data to obtain improved image quality. Output image data is switched among image data subjected to smoothing, image data subjected to second bit conversion, and image data subjected to pseudo halftone representation process.... | 10/28/2008 |
| 7440142 | Image processing system with multi-valued processing An image processing system receives an input gradient number m, input image data I(x,y) whose input gradient number is m, and an output gradient number n and calculates output image data O(x,y) having an output gradient number of n on the basis of the following form... | 10/21/2008 |
| 7385730 | Image processing apparatus, image processing method, and printing apparatus and printing system using the image processing apparatus In an apparatus for performing printing using a color ink-jet head having a plurality of ink-discharge-port strings corresponding to ink materials having different color tones, a high-quality image having excellent gradation can be recorded, while reducing the cost ... | 06/10/2008 |
| 7385731 | Method and system for processing a multi-colour image A method and system are provided for processing digital multi-colour images for the reproduction thereof on a colour printing and/or copying system. Particularly, the printing and/or copying system is capable of complementary forming registered composite multi-colou... | 06/10/2008 |
| 7372594 | Image processing apparatus and method, and storage medium A pattern which does not appear at a flat portion in normal binarization processing is set as a code pattern, and a code formed from this pattern is attached. At this time, code attachment with little degradation in image quality is implemented by selecting an unnot... | 05/13/2008 |
| 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 |
| 7369277 | Image processing apparatus, drawing processing method, and computer program A drawing instruction processor refers to a bit map line table that shows whether the bit arrays in the row unit are the same in the order of concentrations. The drawing instruction processor decides whether dither patterns to be used for the adjacent specified draw... | 05/06/2008 |
| 7362473 | Image processing technique for tone number conversion of image data The present invention relates to an image processing technique for improving dot dispersion in highlight areas and shadow areas in an error diffusion method. The image processing device of the invention has a plurality of types of error diffusion matrices wit... | 04/22/2008 |
| 7359091 | Multi-bit output sampled threshold array halftoner Xerox Reference No. D/A0639A system and method for improving xerographic halftoning by magnifying a threshold array, interpolating the in-between values, enabling multiple thresholds to be accessed simultaneously and presented to multiple comparators, to cause multi... | 04/15/2008 |
| 7336734 | Method and device for the fourth-order, blind identification of an under-determined mixture of sources A method for the fourth-order, blind identification of at least two sources in a system comprising a number of sources P and a number N or reception sensors receiving the observations, said sources having different tri-spectra. The method comprises at least the foll... | 02/26/2008 |
| 7330291 | Dither mask creating method and creating device In a computer generation of a dither mask for conversion of a continuous-tone image into a halftone image, a pixel array having a size in accordance with the dither mask is partitioned into blocks. Initial pixel values are determined such that the occurrences of pix... | 02/12/2008 |
| 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 |
| 7327373 | 3D dither algorithm A four-time resolution refinement of 3D-dither algorithm is provided in this present invention. A 4×2 pixel-block is treated as an observed unit in this present invention, which includes two 2×2 pixel-blocks. In order to eliminate moving lines and dithered edges, ... | 02/05/2008 |
| 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 |
| 7315395 | Image processing apparatus, image processing method, program for implementing the method, and storage medium There is provided an image processing apparatus which enables high-speed processing with simplified multiplications and divisions even in the case of error diffusion comprised of a combination of processes of two or more colors. The image processing apparatus perfor... | 01/01/2008 |
| 7312901 | Image processing apparatus, image processing method, and program In an image processing apparatus which performs an error diffusion process to multivalued image data consisting of plural density components and outputs a result of the error diffusion process, the process result from a first error diffusion unit performing the erro... | 12/25/2007 |
| 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 |
| 7286268 | Image processing apparatus capable of preventing pseudo contour There is provided an image processing apparatus employing an error diffusion method capable of preventing a pseudo contour attributable to a delayed dot. The image processing apparatus receives an error diffused from a neighboring pixel and corrects a value (an inpu... | 10/23/2007 |
| 7268790 | Display system with framestore and stochastic dithering A display system provides temporal stochastic dithering to image data for storage in a frame buffer for display. Stochastic dithering is used to reduce the size of the frame buffer and the complexity of the drive circuitry that is used to display an image in accorda... | 09/11/2007 |
| 7246871 | Method and apparatus for compensating for printhead damage Micromechanical pagewidth printheads include a very large number of separately addressable thermal ink ejection actuators. Failure, or degraded performance, of actuators typically leads to white lines occurring down printed media. A method for addressing this proble... | 07/24/2007 |
| 7233303 | Method of displaying high-density dot-matrix bit-mapped image on low-density dot-matrix display and system therefor A method of and system for displaying high-density bit-mapped dot-matrix imaging data on a large-scale low-density dot-matrix display is disclosed. Bit-mapped image data from each of multiple and adjacently oriented dot image data groups is allocated to drive one do... | 06/19/2007 |
| 7233339 | Method and apparatus for performing dithering A method and apparatus for dithering may provide filtering M bit data and performing a temporal/spatial compensation based on LSB of the filtered M bit data. The dithering may be performed on a selected frame. M-2 bits of the M bit data may be specified as a referen... | 06/19/2007 |
| 7230737 | Image processing method and apparatus An image processing method for inputting a color image signal and correcting the color image signal according to an observation condition, comprising the steps of: judging whether or not the input color image signal represents achromatic color; and controlling the c... | 06/12/2007 |
| 7227669 | Method of selective edge softening and rendering for the suppression of halo Selective edge softening and selective edge dithering is introduced into an image representation to improve local control where halo problems are expected. Selective areas of dilation are isolated and separately dithered or halftoned, the result of which is then swa... | 06/05/2007 |
| 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 |
| 7218419 | Image processing method and apparatus, and recording medium A method that quickly corrects an image without inputting more than a required number of rendering instructions. Input image that contains a plurality of objects, and rendering command statements that specify rendering of the plurality of objects are input and analy... | 05/15/2007 |
| 7218420 | Gray level halftone processing An image processing method and apparatus for generating a gray level rendered pixel value that has been subjected to a halftoning process. In the method and apparatus a gray level pixel value of the pixel to be rendered by the halftoning process is provided as one i... | 05/15/2007 |
| 7209144 | Image-display apparatus, image-display method, and image-display program Aspects of the invention provide an image-display apparatus including an image display, such as a liquid-crystal display panel, where the image display can display a limited number of gray scales, interpolation is performed so that the number of gray scales displaye... | 04/24/2007 |
| 7209244 | Post RIP image rendering in an electrographic printer to minimize screen frequency sensitivity A method of printing multiple images with differing line screen frequencies with a printer is print sensitive to differing line screen frequencies, the method comprising the steps of: converting the images into a digital bitmap comprised of an array of pixels wherei... | 04/24/2007 |
