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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...
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7370929 |
Printer, dither matrix generation method, and recording medium
A printer has a head where outlets are arranged in a width direction perpendicular to a predetermined scan direction, and a printing paper moves under the head in the scan direction. In a basic...
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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...
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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...
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7365883 |
Dither matrix design using sub-pixel addressability
A method of generating a dither matrix for an output device having sub-pixel addressability that permits the attenuation of tone for less than whole pixels. An original representative pixel grid is...
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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...
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RE40170 |
Multi-tone image processing method and apparatus
A multi-tone image processing method and apparatus in which mutually dissimilar tone levels are realized by changing the additive condition of recording energy by means of different recording...
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7345791 |
Image processing device and image processing method
An image processing device for processing an input image so as to reproduce a halftone, includes: a matrix setting section for setting a threshold matrix having a plurality of elements arranged in...
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7342689 |
Methods and apparatus for converting full color images to two-color images for printing at a two-color printer
Methods and apparatus are provided for converting a full color image to a two-color image for printing at a two-color printer capable of printing black pixels and alternate color pixels. Black...
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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....
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7330193 |
Low noise dithering and color palette designs
Methods for choosing and combining colors from a color palette to render an image color tone are disclosed. A set of up to four palette colors are chosen and the weighted factors for combining the...
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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...
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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...
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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...
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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...
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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...
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7301668 |
Printing apparatus with generating means for generating a mask pattern comprising a plurality of planes, control method therefor, and program
A CPU generates a mask pattern by generating patterns corresponding to a predetermined number of times in the sub-scanning direction in accordance with the number of printing elements of a...
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7298525 |
Image processing device and image processing program for processing a plurality of color signals formed of a plurality of color components
In a halftone module, it is judged whether or not the value “rate” for each pixel is greater than zero (0). In other words, it is judged whether or not the eight-bit input data Iin of each...
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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 ( 10 a, 10 b, 10 c, 10 d ) using a spatial filter ( 20 ) which is created...
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7277205 |
Dither volume with three thresholds for each cell location
While a general large layer dither volume provides great flexibility in dither cell design, by decoupling different intensity levels, they are inefficient to access since each colour component...
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7277204 |
Stochastic halftone screening method
A method of building threshold matrices for stochastic screening by using the actual size and shape of imaged pixel and/or pixel agglomerate instead of the nominal one, in the stage of calculating...
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7270391 |
Method for processing an image
A method for processing image data includes the step of dithering a contone layer of the image data. A black bi-level layer of the image data is composited over the contone layer. An infrared tag...
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7245778 |
Methods, devices and systems for compressing images
Methods, devices and systems for compressing images are provided. One method includes creating halftone mask structures and applying compression coding techniques to arrayed pixels sorted using the...
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7245396 |
Image data coding apparatus, image data decoding apparatus, image data coding method and image data decoding method
This invention has as its object to efficiently encode an image. To this end, for example, an image undergoes a color reduction process using a dither matrix with a predetermined size. A print...
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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...
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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...
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7221483 |
Image encoding method and apparatus, image decoding method and apparatus, image processing apparatus, image formation apparatus, and computer-executable programs
Image data is encoded using a block consisting of a plurality of pixels as a unit of processing. A statistics section extracts statistical information for each pixel value, from a plurality of...
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7212315 |
Mixed screen design for multi-mode document
A superpattern generator uses a first halftone pattern representing a first gray level and a second halftone pattern representing a second gray level to generate a larger pattern or...
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7184177 |
Method, apparatus and article of manufacture for modifying printing based upon direct on-the-fly media characteristic parameters
A method, apparatus and article of manufacture for modifying printing based upon direct on-the-fly media characteristic parameters is disclosed. The present invention on-the-fly directly measures a...
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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...
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7177052 |
Dithered image for bi-level printing
A method of printing a contone image in the form an array of contone color pixel values using a printer adapted to print bi-level dots. In the method comprising the contone image is dithered using...
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7170639 |
Halftone method and apparatus that provides simultaneous, multiple lines per inch screens
A halftone threshold matrix includes a plurality of submatrices, wherein a first group of the plurality of submatrices has a line screen frequency different from a second group of the plurality of...
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7161712 |
Apparatus for forming images with proper gamma correction
An apparatus for forming an image includes a photosensitive body, an optical write unit which scans a light beam along a main scan path on a photosensitive body to create a latent image thereon,...
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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...
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7154637 |
Dither volume for cell location
While a general large layer dither volume provides great flexibility in dither cell design, by decoupling different intensity levels, they are inefficient to access since each color component...
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7151619 |
Image formation apparatus
An image formation apparatus includes an aperiodic data generating unit for generating aperiodic data between pixel areas having a neighboring relation every pixel area comprising a plurality of...
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7145675 |
Humidity-based printer system control
A printer system comprises a communication interface and printer components. The communication interface receives a humidity value from a toner cartridge. The printer components control printing...
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7136193 |
Image processing technology performing designated processing on normal orthogonally transformed images
Noise adding unit 700 reads the downloaded target JPEG image from memory and adds designated noise to that JPEG image. Reverse DCT transformation unit 710 performs reverse discrete cosine...
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7102791 |
Mask producing method, image outputting device and computer readable recording medium
A mask is produced for converting multi-level image data into a halftone image through comparison with a threshold for each pixel. For this purpose, a dot pattern is determined on each of...
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7092125 |
Method of printing using PC and printer
It is necessary that paper be moved past the printhead at a constant velocity to obtain artifact-free printing. Therefore the printhead requires a constant stream of data during printing. Whilst it...
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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...
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7085016 |
Method and apparatus for dithering and inversely dithering in image processing and computer graphics
The invention provides a method and an apparatus for dithering, and inversely dithering an image. The apparatus makes use of a pixel address and a pixel data to locate a dither reference value from...
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7085014 |
Method, apparatus and article of manufacture using media roughness as a print parameter
A method, apparatus and article of manufacture for providing improved print quality regardless of media smoothness is disclosed. Information regarding the smoothness of media is ascertained and the...
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7081901 |
Display system with framestore and stochastic dithering
A display system provides stochastic dithering to image data for storage in a frame buffer for display. Dithering is used to reduce the size of the frame buffer and to reduce the complexity of the...
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7079290 |
Halftoning method and system providing increased number of densities per basic halftone cell for constant input
Apparatus and method for flexible digital halftoning are provided in which novel pattern choices are allowed by not restricting the basic halftone patterns to grow sequentially. Rather, positions...
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7054038 |
Method and apparatus for generating digital halftone images by multi color dithering
The invention provides a method and apparatus for the reproduction of color images by multi-color dithering. Multi-color dithering is an extension of bi-level dithering for halftoning an input...
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7046863 |
Optimizing the advantages of multi-level rendering
Systems and methods for optimizing the advantages of multi-level rendering of text and/or graphics at an output device by providing an alternate manner to perform multi-level rendering. A computer...
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7043080 |
Methods and systems for text detection in mixed-context documents using local geometric signatures
Embodiments of the present invention relate to methods and systems for detection and delineation of text characters in images which may contain combinations of text and graphical content....
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7018050 |
System and method for correcting luminance non-uniformity of obliquely projected images
A system and method corrects luminance non-uniformity caused by images being obliquely projected onto a screen. A camera is used to record the geometry of the obliquely displayed image. Utilizing...
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7012717 |
Multi-level dither screening on a split arithmetic logic unit processor
This invention is a method of multilevel dither screening in a printer. Plural pixel values are packed into equal sections of a first data word. Corresponding dither values are packed into the...
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