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| Number | Title | Issue Date |
| 8134749 | Multi-bit-depth error diffusion for the reproduction of color or monochrome images An image processing system including a lookup table having multi-bit printer output levels and an imaging input level. The imaging input level may be associated with a range of input pixel densities. The system further includes a processor configured to compare the ... | 03/13/2012 |
| 7965418 | Image processing apparatus and image processing method Image processing apparatus and image processing method for formation of high quality image by high-speed error diffusion processing by execution of more complicated threshold condition processing in a simple manner. When error diffusion processing is performed on mu... | 06/21/2011 |
| 7952764 | Hierarchical color error diffusion in a CMYKRGB domain What is provided are a novel system, method, and computer program product for hierarchical (telescopic) color error diffusion which effectively controls the dot distribution for both primary and secondary dot formation which covers the class of error diffusion that ... | 05/31/2011 |
| 7916350 | Minimizing visual artifacts in a brick-layer halftone structure What is disclosed is a novel system and method for minimizing visual artifacts, such as ROS skew and laserbeam bow, in a brick-layer halftone structure. The present method involves determining a line pattern from ROS skew and laserbeam bow profiles which traverses t... | 03/29/2011 |
| 7859723 | Image processing to perform error diffusion with dots formed based color component values and their sum relative to a threshold Image processing apparatus and image processing method for formation of high quality image by high-speed error diffusion processing by execution of more complicated threshold condition processing in a simple manner. When error diffusion processing is performed on mu... | 12/28/2010 |
| 7660016 | Image-processing apparatus, an image-forming apparatus, and a program An image-processing apparatus for quantizing multi-level (M-level) image data into N-level values, where M>N>1, using a multi-level error-diffusion process or a minimum-average multi-level error method is disclosed. The image-processing apparatus includes: me... | 02/09/2010 |
| 7636179 | Image quantization processing with error diffusion using oscillating quantization threshold to develop dots that spiral outward An image processing method of quantizing multi-tone image data by an error diffusion method, includes the steps of a) detecting change of the image data; and b) oscillating cyclically in image space a threshold for the quantization in an oscillation range controlled... | 12/22/2009 |
| 7548346 | Image processing apparatus and method for performing error diffusion based on density values of different color components Image processing apparatus and image processing method for formation of high quality image by high-speed error diffusion processing by execution of more complicated threshold condition processing in a simple manner. When error diffusion processing is performed on mu... | 06/16/2009 |
| 7532361 | Image forming system, apparatus, and method When a three-dimensional image viewed stereoscopically by superposition of a lenticular sheet is merely binarized and output, fringes are produced in the direction in which cylindrical lens elements repeat on the lenticular sheet, and therefore an appropriate stereo... | 05/12/2009 |
| 7443542 | Method and apparatus for determining error diffusion coefficients Provided are a method and apparatus for determining error diffusion coefficients. The method includes: (a) setting N groups of error diffusion coefficients (N is a positive integer), in which each group includes a plurality of coefficients; (b) binarizing an image h... | 10/28/2008 |
| 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 |
| 7417771 | Error diffusion halftoning system Artifacts of error diffusion halftoning are reduced by selecting a halftone threshold for a current pixel on the basis of an accumulated halftone error for the pixel and its neighbors. ... | 08/26/2008 |
| 7414756 | Image processing apparatus for converting image data by unit of multiple pixels and printing apparatus The image processing apparatus or the printing device of the present invention forms units by grouping adjacent multiple-pixels and converts the image data to the dot data representing dot on/off state for each of pixels. The apparatus stores the dot data in ... | 08/19/2008 |
| 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 |
| 7369710 | Image processing device, image processing method and image processing program An image processing device performs an error diffusion on multilevel input image data to generate multilevel output image data that has fewer levels than the multilevel input image data. The image processing device includes a plurality of setting devices, each of wh... | 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 |
| 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 |
| 7355747 | System for improving the speed of data processing An apparatus includes a first processing device to perform halftoning on a first set of values corresponding to a first set of pixels and a second processing device to perform halftoning on a second set of values corresponding to a second set of pixels, with ones of... | 04/08/2008 |
| 7342688 | Apparatus for eliminating moire in scanned image and method for the same A method for eliminating moire in scanned digital image comprises the steps of using an average circuit for taking weighted average and error diffusing a gray level difference between an error diffusion pixel Gij and neighbor pixels to neighbor to obtain ... | 03/11/2008 |
| 7339706 | Error diffusion processing circuit for an image signal which improves an output image An error diffusion processing circuit includes an error diffusion processing unit and a noise signal unit. The error diffusion processing unit generates a first output image signal of a first pixel by carrying out an error diffusion process, based on an inputted fir... | 03/04/2008 |
| 7336398 | Error prediction method for halftone processing An error diffusion method applied to halftone processing for image data. The image data comprise a plurality of pixels. The method comprising the steps of dividing the image data into a plurality of image blocks; selecting one of the pixels belonging to each of the ... | 02/26/2008 |
| 7333243 | Calculating error diffusion errors to minimize memory accesses The present invention relates to error diffusion logic in which three partial diffusion error values are produced in a pipelined manner and then summed together when the last partial error value is produced. The resulting summed error can be used to adjust a target ... | 02/19/2008 |
| 7333244 | Method and system for embedding an image into two other images A method of embedding an image into two images by performing a digital halftoning process on a Cartesian product of color spaces to embed the image into the two images. A digital halftoning process includes an iterative isotropic halftoning process. The iterative is... | 02/19/2008 |
| 7319549 | Multiple weight error diffusion A method for halftoning includes the steps of defining a first set of weight sets, and defining a second set of weight sets. A first error associated with a first pixel location of a plurality of pixel locations is diffused to a first neighboring at least one pixel ... | 01/15/2008 |
| 7317431 | Display panel driving method A method of grayscale-driving a display panel in accordance with pixel data derived from a video signal. The display panel includes a plurality of display lines, with a plurality of pixel cells serving as pixels being arranged on each display line. A display period ... | 01/08/2008 |
| 7317556 | Method for error diffusion 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... | 01/08/2008 |
| 7317555 | Image forming apparatus When the present image forming apparatus is used as a network scanner configured to read a document and forward corresponding image data to a network, delay memories M, C, K allow RGB image data supplied from the scanner to be delayed by an equal time. A specific do... | 01/08/2008 |
| 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 |
| 7315398 | Multi-level error diffusion with color image data A method for processing color image data to generate multi-level image data with arbitrary output levels and arbitrary level spacing. The method identifies a gray level spacing for each of a first and second color separation pixels and scales the gray level for each... | 01/01/2008 |
| 7315401 | Quantization apparatus and method, and inkjet printing apparatus using the same It is an object of this invention to provide a ternary or higher-order quantization method which avoids close gathering of pixels at a first output level. First and second threshold values Lth1 and Lth2 for ternarization and output values 0 (blank), 1,... | 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 |
| 7295347 | Image processing method for generating multi-level data A method of processing image data when generating multi-level data having arbitrary levels with arbitrary level spacing. The method scales the value of the input pixel to a common level spacing in relation to the arbitrary level spacing in which the input pixel resi... | 11/13/2007 |
| 7292373 | Method and apparatus for image processing capable of high speed processing In a image processing apparatus executing an error diffusion process, normal error diffusion process is performed when an input pixel value is not “0”. When the input value is “0” (white pixel), “0” is automatically output, error memory of the pixel is r... | 11/06/2007 |
| 7280252 | Error diffusion of multiresolutional representations A method and apparatus for performing error diffusion of a multiresolutional representation of an image is disclosed herein. In one embodiment, an image is received as a pixel representation. The image is converted from a pixel representation to a multiresolutional ... | 10/09/2007 |
| 7280259 | Method for printing a color proof using a spatial filter The invention is a method for printing a color proof from an initial halftone bitmap file (10) having individual dots (10a, 10b, 10c, 10d) using a spatial filter (20) which is created from a calib... | 10/09/2007 |
| 7268919 | Image data processing apparatus, method, and program that diffuses gradiation error for each pixel in target block There has been a demand to accelerate image data conversion through the use of the error diffusion method. To convert image data, it is determined whether a specified block process condition is satisfied on the basis of a gradation value for each pixel in a target b... | 09/11/2007 |
| 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 |
| 7253926 | Image-processing apparatus, method and program for outputting an image to a plurality of functions There is described a compound apparatus, having a plurality of outputting functions including at least a copy function. The compound apparatus includes: an image-reading device to read an original image residing on a document so as to convert the original image into... | 08/07/2007 |
| 7245397 | Apparatus and method for halftoning color image by quantizing tone level of subject pixel based on tone levels of neighboring pixels An image forming apparatus is disclosed in which a quantization is effected for a halftone color image decomposed into pixels, in which a comparison is made, for respective separate color-components of each pixel, between a tone level of each pixel and a threshold v... | 07/17/2007 |
| 7236269 | System and method for dithering with reduced memory A dithering system yielding two-dimensional dither functioning is implemented without line memories. For each primary input color, a feedback loop outputs an color input signal plus error that can be preset to different values. The desired result is that vertical ar... | 06/26/2007 |
