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| Number | Title | Issue Date |
| 8169664 | Image processing apparatus and method for quantizing pixel of interest by error diffusion method A quantizing unit, error detector, error diffusion matrix, and adder quantize a pixel of interest of an input image by an error diffusion method. A calculation unit and gain adjuster calculate a value to be added to the pixel of interest with reference to quantized ... | 05/01/2012 |
| 8169663 | Image processing system and method for quantizing an image by using an error diffusion method An image processing apparatus includes (i) a repulsive force generating section for setting repulsive force values RVa and RVu of a quantized pixel according to an output pixel value of the quantized pixel, (ii) a repulsive force calculating section for calculating ... | 05/01/2012 |
| 8098403 | Color error diffusion with error signal offset 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 determining modified output levels using a combined error signal formed from inter... | 01/17/2012 |
| 8077355 | Digital halftoning method utilizing diffused weighting and class matrix optimization The present invention discloses a digital halftoning method. The method comprises steps of: (a1) dividing an original image into non-overlapping blocks; (a2) obtaining a Least-Mean-Square trained (LMS-trained) filter by comparing at least a training image and a half... | 12/13/2011 |
| 8031372 | System and method for distributing image values of a color separation A method processes image data in a color separation to attenuate printing defects arising from misalignment of serially arranged printheads that eject ink for the color separation. The method includes processing image values of the color separation with a first rend... | 10/04/2011 |
| 8023152 | Method for frequency-modulation screening using error diffusion based on dual-feedback The present invention relates to a method for producing halftone dots in the field of image hard copying, more particularly to a method for frequency-modulation screening using error diffusion based on dual-feedback. In the known frequency-modulation and amplitude-m... | 09/20/2011 |
| 8009327 | Method and apparatus for image processing This disclosure relates to decreasing the required buffer memory capacity while reducing the impact of an arithmetic error in error diffusion processing. A quantization circuit (4) quantizes input image data and outputs an output code. The quantization error ... | 08/30/2011 |
| 7982916 | Color error diffusion with error signal offset 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 determining modified output levels using a combined error signal formed from inter... | 07/19/2011 |
| 7969616 | Systems and methods for efficient print job compression Systems and methods described herein provide for an efficient method for print job compression. In some embodiments, threshold halftone lookup tables directed to specific object types are used to compare pixel data for specific detected objects. Pixel data for such ... | 06/28/2011 |
| 7940427 | Image processing apparatus, printing apparatus and image processing method An image processing apparatus, a printing apparatus and an image processing method are provided which can perform quantization processing on image data at high speed based on an error diffusion method while at the same time avoiding degradations in a quality of prin... | 05/10/2011 |
| 7936479 | Image processing method for reducing imaging artifacts An image processing method includes a step of converting halftoned pixels of an image to be printed represented at a first lower tonal resolution into pixels represented at a second higher tonal resolution. Image processing is used on the pixels having a higher tona... | 05/03/2011 |
| 7916349 | Color pixel error diffusion in a CMYK input color space What is disclosed is a system and method for diffusing pixel error in a halftoning process in a color management system. The present method divides a modified CMYK input into a real and imaginary portions. The real portion is the coverage achieved by a physically re... | 03/29/2011 |
| 7907306 | Image processing apparatus and method, and image forming apparatus and method An image processing apparatus which converts multiple-value image data of an image into a plurality of dot patterns to form the image on a recording medium includes: a corrected recording element signal table storage device which stores a plurality of corrected reco... | 03/15/2011 |
| 7907307 | Image processing method and apparatus, and image forming method and apparatus An image processing method of converting multiple-value image data into including the steps of: preparing dot pattern tables respectively for the graduated tone numbers, each of the dot pattern tables being demarcated into blocks of the dot patterns correlated with ... | 03/15/2011 |
| 7903290 | Printing method with camouflage of defective print elements A printing method is provided for a printer having a printhead with a plurality of print elements and capable of printing a binary pixel image. The method includes locating defective print elements, determining a camouflage area in the vicinity of pixels that would ... | 03/08/2011 |
| 7898691 | Image processor, image formation device, image processing method, and computer-readable medium An image processor includes: a gradation value acquisition unit that acquires a gradation value of a pixel of interest which is a pixel sequentially selected as a target of a binarization process from input image data represented by pixels of M gradations, wherein M... | 03/01/2011 |
| 7884969 | Image processing apparatus, printing apparatus and image processing method An image processing apparatus, a printing apparatus and an image processing method are provided which can perform quantization processing on image data at high speed based on an error diffusion method while at the same time avoiding degradations in a quality of prin... | 02/08/2011 |
| 7855809 | Image processing apparatus and method for executing a process of error diffusion An image processing apparatus executes an error diffusion process to multivalue image data consisting of a plurality of density components. A first processor executes the error diffusion process by changing at least one of a quantization threshold value and a quanti... | 12/21/2010 |
| 7733531 | Image processing apparatus, image processing program, and image processing method with error diffusion An image processing apparatus includes: an image data acquiring unit that acquires image data formed of plural pixel data having an M-ary (M≧3) gradation value; a grouping unit that divides the image data acquired into J (J≧2) image data areas and sections the J... | 06/08/2010 |
| 7719718 | Threshold modification for limit cycle removal in vector error diffusion A device and method is provided for breaking up undesirable patterns in vector error diffusion when the sum of inputs is near fraction values of the total input range. In the method, the value of the sum is calculated modulo the maximum input value. The mod value te... | 05/18/2010 |
| 7710604 | Method and system for providing a high quality halftoned image A method and system for providing a halftoned image is disclosed. The method and system comprise scaling the halftoned image by performing pel repetition utilizing an error diffusion algorithm such that artifacts are minimized. According a system and method in accor... | 05/04/2010 |
| 7701614 | Image processing method, apparatus, and program with selective error diffusion among a pluraity of pixel groups withing a digital image The image processing method for performing halftoning of a digital image constituted by an array of pixels having grayscale values which correspond to a content of the digital image, the method comprises the steps of: grouping the pixels constituting the digital ima... | 04/20/2010 |
| 7692817 | Image processing method, image processing apparatus, image forming apparatus, computer program product and computer memory product for carrying out image processing by transforming image data to image data having spatial frequency components Image processing is carried out by transforming image data to image data having spatial frequency components, by judging whether the absolute values of the coefficients of the predetermined frequency components of the transformed image data are equal to or more than... | 04/06/2010 |
| 7663782 | System and method for high addressable binary image generation using rank ordered error diffusion on pixels within a neighborhood The disclosed system and method provide a binary image generation method. Used, for example, in a digital reprographic system, the method is suitable for eliminating printing artifacts for high addressable binary digital output, such as digital copies, using an opti... | 02/16/2010 |
| 7639399 | Image processing method A plurality of items of color-component data representing an image are input and a plurality of items of output color-component data representing an image to be reproduced by a printer are decided and output. In the case of an image in a specific area in which an en... | 12/29/2009 |
| 7626729 | Halftoning with color error diffusion of one separation based on color error diffusion of a previous separation Embodiments include a method for halftoning a source image. The halftoning includes error diffusion processing of a first separation of plural color separations of a pre-rendered image after error diffusion processing a second separation of the plural color separati... | 12/01/2009 |
| 7623267 | Image processing method, apparatus and program The image processing method for obtaining a quantized image from a multiple tone image, the method comprises: an image dividing step of dividing an input image into a plurality of image blocks of a unit block size; a threshold value matrix specification step of spec... | 11/24/2009 |
| 7612916 | Image processing device, image processing method, and computer program An image processing device includes a memory that is adapted to store an input image; an inverted image generator that is adapted to generate an inverted image, the inverted image corresponding to a predetermined part of the input image; a target image generator tha... | 11/03/2009 |
| 7570392 | Error diffusion method and apparatus using weighted vectors along a diagonal to correct for non-ideal ink ejection A device including: an acquirer acquiring image data having an M-value (M≧3) pixel value; a memory storing nozzle information; another memory storing error diffusion matrices having different diffusion ratios of an error; a selector selecting specific pixel data i... | 08/04/2009 |
| 7564589 | Color error diffusion with error signal offsets 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 shifted error signals for each color channel, weighting the shifted erro... | 07/21/2009 |
| 7564590 | Image processing apparatus and method An image processing method and apparatus is provided that executes conversion processing of image data according to an error diffusion method. A unit processing for one pixel of the original image and another unit processing for an interpolate pixel that is inserted... | 07/21/2009 |
| 7564588 | Image forming device, image forming method, and recording medium that provide multi-level error diffusion An image forming device includes a quantization unit which quantizes each pixel of an M-level gradation input image into one of N levels (M>N≧2) through an error diffusion process. An operation unit performs a predetermined operation according to a position of a t... | 07/21/2009 |
| 7557961 | Method for setting boundary value, image signal processing method and apparatus, and printing apparatus A method for setting a boundary value at a level of error diffusion, comprising a step of defining a characteristic curve on a coordinate plane defined by a first axis indicating a perceptually uniform scale and a second axis indicating grayscale values of original ... | 07/07/2009 |
| 7551323 | Systems and methods for error diffusion Error diffusion is performed upon input image data. In one aspect, multiple error diffusion processing elements perform error diffusion on a selected pixel in parallel. In another aspect, the error diffusion logic is integrally formed with a fast local memory in the... | 06/23/2009 |
| 7542170 | Method for enhancing print quality of halftone images A method for enhancing the print quality of halftone images makes use of error diffusion to perform halftone image processing to a document. After an RGB image is obtained by scanning the document, a high-pass filter is used to detect the edge characteristics and ed... | 06/02/2009 |
| 7538909 | Defective nozzle compensation An image recording apparatus (2000) is disclosed, which includes forming elements (2002) for forming an image, a memory (2006) indicating relative desirability of utilizing the forming elements (2002) for forming the image, and processing... | 05/26/2009 |
| 7518754 | Apparatus and method for error diffusion with dither The input pixels in an image to be halftoned using error diffusion are dithered using a first type of passband dither. A second type of passband dither may also be added to a thresholding matrix used in halftoning. This second type of passband dither may be the same... | 04/14/2009 |
| 7518753 | Full control multilevel error diffusion A method for processing a digitized continuous tone image for reproducing the image by a printing device, including (a) inputting a tone value of an input pixel of the image; (b) applying a plurality of levelsplit curves to the tone value, thus obtaining a plurality... | 04/14/2009 |
| 7483176 | Image processing apparatus and method In order to reduce time required to perform error diffusion processing on one line of image data, one line of multi-tone image data 100 is divided into two or more segments of image data 102 and 103 with an overlapped region 101 provided ... | 01/27/2009 |
| 7480078 | Method and system for performing multi-pixel parallel error diffusion enabling high-speed diffusion processing without increasing the system clock rate A method and system for performing error diffusion are disclosed. An ordered set of pixels, including a pixel intensity value for each pixel, is received. Each pixel intensity value includes a value within a range from a low value to a high value, inclusive. An init... | 01/20/2009 |
