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8164788 |
Cluster-based printer model for tone reproduction curve estimation
What is disclosed is a system and method for efficiently and accurately estimating the complete TRC for a color marking device equipped with a multi-center cluster halftone screen which has a...
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8144179 |
Image forming apparatus and control method thereof
An image forming apparatus that includes: a laser beam source; plural photoconductive members corresponding to plural colors; a modulation drive unit for performing pulse width modulation for each...
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8098406 |
Image forming apparatus capable of suppressing color variation due to misregistration of colors, image forming method, and computer-readable medium
An image forming apparatus performs dither processing on image data to form an image subjected to pseudo-halftone processing. The image forming apparatus includes a dither processing unit that...
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8085434 |
Printer characterization for UV encryption applications
The appearance of a color print viewed under UV illumination is predicted using a target comprising color patches each printed using a known coverage of printer colorant(s). In one case, the target...
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8085438 |
Printing color images visible under UV light on security documents and valuable articles
A new method of creating fluorescent color images visible under UV light is proposed, which relies on fluorescent colorants obtained by superposing fluorescent ink dots, on juxtaposed halftoning,...
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8023160 |
Encoding message data in a cover contone image via halftone dot orientation
What is disclosed is a novel system and method for encoding/decoding data in a cover contone image via halftone dot orientation modulation. Arrays of halftone threshold values are used to determine...
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8014035 |
Decoding message data embedded in an image print via halftone dot orientation
What is disclosed is a novel system and method for encoding/decoding data in a cover contone image via halftone dot orientation modulation. Arrays of halftone threshold values are used to determine...
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8014036 |
Methods and apparatus for watermarking digitally printed documents
A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g., 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such inf...
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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...
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7973972 |
Halftone dot formation method and apparatus, and image forming apparatus
An image processing method generates a halftone image by forming a halftone dot represented by a set of one or plural output dots corresponding to an intensity of an input image signal while making...
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7961951 |
Image processing apparatus capable of accurately removing isolated point noise, image processing method, and computer readable medium
An isolated point detection portion detects an isolated point in image data input from an image data adjustment portion. An isolated point removal portion makes a replacement of image data at a...
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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...
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7929180 |
Printing system, printing method, and host apparatus capable of analyzing ink blur
A printing system, printing method, and host apparatus is capable of analyzing the degree of ink blur in consideration of print conditions and the properties of an image typified by a photograph or...
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7924467 |
Image forming apparatus
An image forming apparatus prints a first image data rendered at a first number of halftone levels based on a second image data rendered at a second number of halftone levels larger than the first...
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7920293 |
System and method for patterned encoded halftoning
A preferred embodiment reproduces an image by receiving an input contone array of M contone data values. The contone data values may lie within a range from 1 to N. The embodiment includes...
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7920295 |
Image processing circuit, displaying apparatus, and printing apparatus
An image processing circuit includes: a plurality of counters that extract image blocks each of which includes a predetermined number of pixels from input image data, count a number of pixels...
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7911646 |
Multilevel halftoning for tint graphic, line art and text rendering
Method and apparatus for font/line art rendering via multi-level halftoning including the selecting or generating of halftone cell patterns related to the minimal stable pixel of a rendering...
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7911651 |
Method for screening an image
To improve the rendering of a printing, a halftone rendering method is applied. This method optimally comprises a step for the adaptive tiling of the image. This tiling is based on a subdivision of...
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7889390 |
System and method for the generation of correlation-based digital watermarks using uniform-rosette color halftoning
Systems and method for digitally reproducing a moiré-free color halftone output image having an embedded correlation-based digital watermark are provided using an enhanced halftone screen set ...
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7869085 |
Memory controller, memory control method, rate conversion apparatus, rate conversion method, image-signal-processing apparatus, image-signal-processing method, and program for executing each of those methods
A luminance signal Ya and a color-difference signal Ua/Va constituting an input image signal is transferred to a frame memory (first memory) in the unit of line synchronously with its horizontal...
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7859724 |
Image tiling in ink jet printing systems
A system or method of removing whitespace between tiled or repeated patterns generated during a printing operation. The system takes an initial image and determines if there exist extraneous bits...
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7839537 |
Method and apparatus for multi-color printing using a rosette or diamond halftone screen for one or more of the colors
A method and apparatus for processing image data representing a color separation or mono-color image includes processing the color separation image data or mono-color image data in accordance with...
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7813006 |
Enhancement of glossmark images at low and high densities with selective application of clear toner
The present invention relates to expanding the range of image densities over which the manipulation of differential gloss as may be inherent in halftoned images may be achieved. By selectively...
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7800785 |
Methodology for substrate fluorescent non-overlapping dot design patterns for embedding information in printed documents
The teachings as provided herein relate to a watermark embedded in an image, and methodology for same, that has the property of being relatively indecipherable under normal light, and yet...
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7787154 |
Font printing system having embedded security information comprising variable data periodic line patterns
A method and system is provided for providing a variable data guilloché shaped pattern comprised of variable data differential line pattern fonts comprising decodable template symbols which are ...
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RE41604 |
Halftone patterns
The patterns can be used to reduce one or more undesirable effects such as moire or colour shift in coloured halftone images. Colour screens in the images are based on a combination of...
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7782493 |
Method of generating threshold matrix for creating halftone dot image and method and apparatus for creating halftone dot image and recording medium
To generate a threshold matrix which is compared with an original image in creating a halftone dot image for each color component, in a matrix area for one color component, dot centers are arranged...
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7748813 |
Print apparatus, print method and recording medium driving apparatus
Disclosed is a print apparatus including a rotating unit rotating a printed object, a print head printing visible information by ejecting ink droplets onto the printed object being rotated by the...
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7715054 |
Image processing apparatus, image processing method and image forming apparatus
An image processing apparatus includes an input section and a binarizing section. The input section inputs multilevel image data. The binarizing section binarizes multilevel image data to generate...
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7688473 |
Tinted edge enhancement using harmonic halftones for the boundary pixels
Disclosed herein is an image processing method for producing enhanced halftone edges, particularly suited to those edges which only lie upon the background as apposed to those edges which abut...
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7656557 |
Tools to embed tampering indicator into digital visual works using two screens with halftoning elements of different size dots or shapes
In accordance with one embodiment, apparatus are provided, which include a digital continuous-tone two-dimensional authentic image and an image processor. Tamper message data is provided which...
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7643179 |
Image forming apparatus and image forming method
A disclosed image forming apparatus for recording images includes: an image processing unit to create toner image data on four colors of yellow (Y), cyan (C), magenta (M), and black (K) such that...
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7619780 |
Method for performing duplex copying
A method for performing duplex copying of a document having a first side with a first image and a second side with a second image includes scanning only the first side of the document under a first...
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7619777 |
Method of generating halftone screen and system thereof
A halftone screen generating method includes growing dot centers into uniform binary patterns in an input image, calculating a main distance of each dot center, forming a screen filter by using the...
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7614716 |
Apparatus discriminating type of recording medium and method of discriminating type of recording medium
A method of discriminating a type of recording medium and a discriminating apparatus in which the type of recording medium is discriminated based on a temperature change of the recording medium...
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7605949 |
Image processing apparatus and image processing method adapted to correct color unevenness
An image processing apparatus includes a storage unit that stores a correction amount used to correct color unevenness of an image according to a plurality of halftone screening conditions; and a...
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7589865 |
Variable differential gloss font image data
The present invention relates to the expedient supply of differential gloss text into a document image, particularly as when desired in the employ of rendering variable data. A font character is...
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7586648 |
Variable-dot halftoning
A method for enabling a program that communicates a document description from a composition system to a printing system to manage variable-dot halftones for use with variable-dot printing devices,...
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7580153 |
Printed visible fonts with attendant background
The present invention relates to the expedient supply of differential gloss or other correlation mark text into a document image via a font definition, particularly as when desired in the employ of...
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7561303 |
Caching and optimisation of compositing
A method (1500) of generating a representation of a page (1000) to be rendered is disclosed. The page (1000) comprises one or more graphic objects (1080, 1090), each being defined by two or more...
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7557962 |
System and method for tone-dependent multi-frequency halftone screening
The present invention is directed to a system and method for halftone screening. A system for halftone screening includes means adapted to receive image data having a desired number of tonal levels...
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7545537 |
Bandless halftone design for multiple beam printers employing non-orthogonal halftones
A multiple beam printer system having N laser beams receives print job information from a print host. A rendering application uses a threshold array to generate halftone image data from the print...
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7528846 |
Systems and methods to adjust a source image aspect ratio to match a different target display aspect ratio
Systems and methods for adjusting a source image aspect ratio to match a different target display aspect ratio are described. In one aspect, the systems and methods determine that a source image...
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7508549 |
Method and apparatus for multi-color printing using hybrid dot-line halftone composite screens
A method and apparatus for generating a multicolor image using halftone screens employs a dot structure dot growth pattern for one or more of the colors and a line structure dot growth pattern for...
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7483587 |
Iterative filtering for dithered imaging
Filtering image information to generate a dithered image includes receiving input image information corresponding to an image generated using a first array comprising a first number of smaller...
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7480072 |
Efficient and flexible multi-bit halftoning
An implementation of a technology, described herein, for efficient and flexible multi-bit halftoning on a marking device, such as a printer. At least one implementation of the technology, described...
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7477415 |
Image processing method and apparatus
A first conversion table defines a plurality of grid points that are arranged in a predetermined color space. The grid points include a darkest grid point that is indicative of a darkest point...
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7460277 |
System and method for halftoning using a time-variable halftone pattern
Successive frames or images of an input image that are presented to the output device are individually halftoned. A starting location within the input image for tiling one of one or more halftone...
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7450121 |
Dynamic bit depth rendering
A method is described of compositing a plurality of graphical objects to create an image comprising a plurality of parts, where the parts may be a run of pixels along a scanline or a region of the...
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7450270 |
Image data processing methods, hard imaging devices, and articles of manufacture
Image data processing methods, hard imaging devices, and articles of manufacture are described. According to one embodiment, an image data processing method includes accessing image data of an...
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