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| Number | Title | Issue Date |
| 7999980 | Image processing apparatus and image processing method for binary and multivalue halftoning An image processing apparatus for converting a multiple gradation image into a binary or multivalue image by use of an area gradation method according to a screen cell is provided. The apparatus includes a receiving unit that receives an input pixel value of each pi... | 08/16/2011 |
| 7852536 | Angle avoidance for color halftone screens A method for avoiding objectionable moiré in a color image can include identifying a problematic excitation angle associated with a problematic excitation in a marking process or in the color image and selecting a set of at least two halftone screens for rendering ... | 12/14/2010 |
| 7830569 | Multilevel halftone screen and sets thereof A three-dimensional halftone screen is provided that is suited for multilevel printing. The three-dimensional halftone screen includes a plurality of planes each corresponding to one or more input intensity levels of an input RIPped pixel. Within the planes are scre... | 11/09/2010 |
| 7436559 | Load assignment in image processing by parallel processing In image processing carried out by means of repeated execution of process set which includes N unit processes (where N is an integer equal to 3 or greater), prior to execution of the process groups, the N unit processes are assigned to a number M (where M is an inte... | 10/14/2008 |
| 7420708 | Method for processing color image data employing a stamp field A method for processing image data that employs a stamp field that contains data representing a distance metric for use with a variety of error diffusion operations. The distance metric possesses distance-order preservation permitting the distance from a previous do... | 09/02/2008 |
| 7375866 | Image processing system and method for screening A system and method for printing an image on a document by generating RGB data from a scanned image, converting the RGB data to CMYK data and identifying one of a first and a second type of screening. The type of screening is identified for a first one of the CMYK d... | 05/20/2008 |
| 7375856 | Halftone screen frequency and magnitude estimation for digital descreening of documents An efficient method and system for eliminating halftone screens from scanned documents while preserving the quality and sharpness of text and line-art is disclosed. The method and system utilizes one or more independent channels with different sensitivities (e.g., M... | 05/20/2008 |
| 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 |
| 7369270 | Print engine/controller and printhead interface chip incorporating the engine/controller A print engine/controller suited to use with a drop on demand print head. The print engine/controller works with compressed page data having both JPEG contone image layers and a bi-level image plane compressed using a Group 4 facsimile protocol. It receives compress... | 05/06/2008 |
| 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 |
| 7362472 | Color error diffusion A method for multi-toning an input digital image having input pixels with two or more color channels to form an output digital image having modified output levels. The method includes producing an error signal for each color channel, combining the error signals to p... | 04/22/2008 |
| 7362481 | Method for reducing image artificiality by adjusting dot position for overlapped dots in a printer An adjusting dot position method for overlapped dots in a printer is disclosed. The pixels of an image are first input. Then, it determines whether the pixel is an overlapped dot or not. If yes and a pixel on a left side is a blank dot, the magenta, cyan or yellow i... | 04/22/2008 |
| 7359088 | Methods and systems for estimating single or multi-color toner coverage on a printer page Methods and systems for estimating single or multi-colored toner coverage on a printed page. One method includes generating color plane bitmaps corresponding to each color in a contone bitmap and calculating pixel coverage values for each of the color plane contone ... | 04/15/2008 |
| 7352489 | Color error diffusion method for multi-level output device An improved color-image error diffusion process for use in conjunction with the operation of a multi-level, halftone, color-image output device. This process involves, first, performing output-device-dependent color error diffusion on color-image input data utilizin... | 04/01/2008 |
| 7336397 | Image processing method for execution externally and internally to a printer A method for image processing data representing a page to be printed includes the step of respectively receiving, in a data processing apparatus, external to a printer, data representing a bi-level black layer and a contone layer of a page to be printed. In the data... | 02/26/2008 |
| 7327492 | Image processing device and image processing method In a black character detection processing, RGB data read from a line buffer is converted into YIQ data. For a subject pixel, a subject area centered on the subject pixel is set, and a judgment pixel that has the lowest brightness in the subject area is set. Then, a ... | 02/05/2008 |
| 7327491 | Image processing apparatus, image processing method, computer program and computer-readable storage medium For M (magenta) and C (cyan), in a case of generating, e.g., ternary data of C0 to C2 and M0 to M2 respectively by using a look-up table on the basis of an error diffusion method, in a highlight portion of input M and C data (to which err... | 02/05/2008 |
| 7324247 | Image processing apparatus, image processing program and storage medium storing the program An image processing apparatus includes a reduced image generating part generating a reduced image having a lower resolution than that of an original digital image. A first extracting part distinctly extracts a first foreground image and a first background image from... | 01/29/2008 |
| 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 |
| 7296184 | Method and system for masking dynamic regions in a user interface to enable testing of user interface consistency A system and method for masking dynamic regions of a user interface that assist in testing of the static user interface layout. The masking regions are used to eliminate the regions of the user interface layout that are expected to change during a verification proce... | 11/13/2007 |
| 7280699 | Compressing and restoring method of image data based on dot areas and positions A method for compressing/restoring image data free from degradation of image quality caused by compression/decompression, a method for compressing image data at high compression ratio, and its restoring method are disclosed. In the image data compressing method, ima... | 10/09/2007 |
| 7277201 | Systems and methods for designing digital anamorphic line screens Historically, the creation of digital line screens was considered to be a subset of the creation of the digital cluster dot screens. The geometric constraints necessary for digital cluster dot screens were imported into the creation of digital line screens. Accordin... | 10/02/2007 |
| 7265874 | Image processing apparatus and method An image processing apparatus processes multivalued color image data that includes a plurality of color components. The apparatus includes an adding unit to add per-color-component quantization error values from a neighboring pixel to respective ones of a plurality ... | 09/04/2007 |
| 7251059 | System for distinguishing line patterns from halftone screens in image data In a system, such as in a digital copier, for classifying image data derived from an original image, the image data is classified by type. An algorithm is applied to the gray levels of pixels surrounding each pixel of interest. The algorithm determines whether a loc... | 07/31/2007 |
| 7231096 | Screening method for overlapping sub-images A method and system for reproducing an image on a carrier, the method includes: generating a conjoined first and second sub-image, each representative for a portion of the image; defining an overlap region where both sub-images give a contribution to the internal op... | 06/12/2007 |
| 7221479 | Method for avoiding multiple color moirés in color halftoning A method for halftoning an image, including receiving image data including a plurality of color separations and comparing image data for first, second, third, and fourth separations to first, second, third, and fourth halftone screens. The screens are characterized ... | 05/22/2007 |
| 7218418 | Digital de-screening of documents A method and a system for de-screening an image signal. The system comprises a filter bank, a control module and a blend module. The filter bank filters the image signal and produces a set of filter output signals. The control module generates at least one control s... | 05/15/2007 |
| 7215444 | Systems and methods for designing zero-shift supercell halftone screens Conventional design tools were not developed for designing square zero-shift supercells. Conventionally, solutions that enable square zero-shift supercells were found by trial and error or by exhaustive analysis. According to a first design criterion of this inventi... | 05/08/2007 |
| 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 |
| 7158263 | Dynamic generation of linearized halftone matrix There is disclosed a method of dynamic generation of a linearized halftone matrix from a high bit resolution halftone matrix, for use in a printer device, for example a domestic or office printer device or a commercial high resolution printer device. A high bit reso... | 01/02/2007 |
| 7148995 | Printing adjustment system and method A printing adjustment method includes providing a plurality of solid and screened density values produced by a proofing device that represent intended density values. The method also includes providing a plurality of solid and screened density values produced by a p... | 12/12/2006 |
| 7149351 | Image processing apparatus and method, computer program and computer-readable storage medium An image processing apparatus having general versatility, for flexible quantization on multivalue image data of two or more colors to image data having a reduced number of bits in correspondence with the number of bits to be quantized, by using an error diffusion sc... | 12/12/2006 |
| 7145702 | Image processing method An image data of M-gradations in a pixel is converted into multivalued image data of N-gradations (M>N>2) in a pixel. A remarked pixel converted into the multivalued data is determined whether to be a predetermined gradation TJ (N>TJ>2) in which a tone jump occurs. ... | 12/05/2006 |
| 7130079 | Selective screening method A method of automatically selecting screen characteristics value to be used for printing a color image, comprising the steps of: forming a digital representation of the color image, the digital representation comprising a plurality of separations; dividing at least ... | 10/31/2006 |
| 7130084 | Electrophotographic apparatus and image processing program An electrophotographic apparatus reproduces a picture by expressing a gradation of the picture by use of halftone spots which are each formed by dot pictures within a plurality of pixels. The electrophotographic apparatus has a picture reproducing engine for forming... | 10/31/2006 |
| 7110128 | Controlling dot connectivity in binarizing an image Communication with an external image output device is established via a network interface, information concerning the characteristics of the image output devices is received and is held in a back-up RAM. A multilevel image containing gray-scale information enters fr... | 09/19/2006 |
| 7099043 | Halftone screening method and storage medium A halftone screening method creates screens of a plurality of colors, where each of the screens is divided into a plurality of cells, and intentionally changes a dot position of certain colors within cells of the screens of the certain colors relative to a dot posit... | 08/29/2006 |
| 7092119 | Method, system, and program for managing calibration files in a printing system Disclosed is a method, system, and program for managing calibration files in a printing system. Patches are printed using a screening algorithm and incorporating at least one output appearance factor. A calibration file is generated from measured color values of the... | 08/15/2006 |
| 7092123 | Evaluation of dot interference moiré A halftone dot image HI composed of halftone dots is produced by halftone dot meshing of an object image OI. A smoothed object image SOI and a smoothed halftone dot image SHI are then produced by smoothing the object image and the halftone dot image. An interference... | 08/15/2006 |
