| Patent Number |
Title Of Patent |
Date Issued |
| 7554696 |
Dot-gain reduction method for multi-level halftoning |
June 30, 2009 |
| A method for minimizing color-image halftone dot-gain in the output of a multi-level halftone color-imaging output device. The method includes characterizing that device's halftone output, on a per-color basis, regarding pixel-pattern-specific dot gain which can be related to device |
| 7417772 |
Vector error diffusion |
August 26, 2008 |
| A vector error diffusion (VED) method employable in cycles with respect to a hi-tonal color printing engine which prints bi-tonal color images in a device output color space. The method generally includes (a) acquiring input color-image data which is characterized with an input color spa |
| 7417771 |
Error diffusion halftoning system |
August 26, 2008 |
| 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. |
| 7369274 |
Color error diffusion method |
May 6, 2008 |
| A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space. The method includes the steps of (a) preparing a final color palette for use in a practice of vector error diffus |
| 7352489 |
Color error diffusion method for multi-level output device |
April 1, 2008 |
| 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 utilizing a halftone, outp |
| 7286267 |
Method for rendering an image comprising multi-level pixels |
October 23, 2007 |
| A halftoning method utilizes staged, overlapping pixel intensity growth in a halftone cell in rendering a halftone image with multi-level pixels. |
| 7262879 |
Method for screening of halftone images |
August 28, 2007 |
| A method of making second generation halftone images lacking visible interference, includes selecting an image which has been halftoned, and determining the number of tone levels required for each pixel of the halftoned image, A halftone cell size is identified, and a dot growth patt |
| 7242500 |
Halftone image down-sampling |
July 10, 2007 |
| Halftone color image down-sampling, performed on a color-channel-by-color-channel basis, with respect to which the selected, overall down-sampling ratio determines whether one or plural down-sampling stage(s) is(are) implemented. If B<(A-1), where A is the original pixel resolutio |
| 7154514 |
Systems and methods for downscaling an image |
December 26, 2006 |
| Systems and methods for downscaling an image. An original image, represented by a collection of individual pixels, is provided so as to be downscaled. One or more of the scan lines of the original image are selectively skipped. One or more of the pixels of non-skipped scan lines are |
| 7102789 |
Method for rendering an image comprising multi-level pixels |
September 5, 2006 |
| A halftoning method utilizes staged, overlapping pixel intensity growth in a halftone cell in rendering a halftone image with multi-level pixels. |
| 7091987 |
Patterning and dot gain improvement for vector error diffusion |
August 15, 2006 |
| A method for processing color-image pixel-data for outputting by a multi-bit (N) color-image output device including the steps of (a) characterizing color-image pixels into N successive, associated scan lines of pixels, which lines are bridged, effectively for processing purposes, by |
| 7061645 |
Non-segmentation, individual pixel-by-pixel-based image rendering system |
June 13, 2006 |
| A non-segmentation, individual pixel-by-pixel-based image rendering system and method provides processing of heterogeneous or homogeneous images, wherein each image comprises a multiplicity of pixels. Each pixel of the image has image information attached thereto. Subsequently, each pixe |
| 7046863 |
Optimizing the advantages of multi-level rendering |
May 16, 2006 |
| 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 device, employed to render an image or graphical entity, is connected to an output device, |
| 6977663 |
Color error diffusion with color bleed control |
December 20, 2005 |
| A method for controlling color bleed in relation to a system-invoked halftone color-image process which involves and includes the practice of error diffusion. The proposed method involves (a) selecting a location in the system which is downstream therein relative to where error diffusion |
| 6915019 |
Method for combining vector-quantization decoding with color transform or halftoning or both |
July 5, 2005 |
| A method of decompressing image data, includes reception of a VQ encoded image. The received image is decoded. Output image color space processing is performed in combination with the decoding as one process. Output image color space processing may include color transformation, half-toni |
| 6765693 |
Photo quality color printing by using light black ink |
July 20, 2004 |
| A method for printing images using light black ink. The method sets a first and second threshold determined by an intensity value of the light black ink relative to standard black ink. The method then determines a gray component density value for a pixel, calculates a black generation va |
| 6552823 |
Enhanced error diffusion by using peak position profiles |
April 22, 2003 |
| A method for enhanced error diffusion. The method includes the steps of selecting values for a first level of peak positions, placing these peak positions in selected positions of a matrix, creating a peak position profile. The peak position profiles are then used to adjust the error |
| 6496603 |
Enhanced error diffusion by using directional guided line thresholding |
December 17, 2002 |
| A method for error diffusion in digital printing. The method selects a base threshold value for printing of digital data, determines an offset value, and then calculates at least two threshold values from the base threshold value and the offset value. The thresholds are applied to the im |
