| Patent application number | Description | Published |
|---|
| 20080198172 | COLOR INFORMATION ENCODING IN MONOCHROME PRINTING - An image processing system including a processor configured to analyze a color image to determine a set of target colors and a database including factor profiles associated with a set of stored colors. The image processing system further includes a printer controller that assigns the factor profiles to the target colors according to a color space proximity of the target colors with the stored colors. The factor profiles represent a combination of factors including a gray level and a screen angle. | 08-21-2008 |
| 20080291499 | 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 imaging input level with one or more preconfigured threshold output values associated with the printer output levels. The imaging input level may be preferentially weighted to select a printer output level having an increased bit depth. | 11-27-2008 |
| 20090195794 | Multilevel Halftoning for Tint Graphic, Line Art and Text Rendering - Method and apparatus for font/line art rending via multi-level halftoning including the selecting or generating of halftone cell patterns related to the minimal stable pixel of a rendering electrophotography (EP) engine and image processors including EP engines. | 08-06-2009 |
| 20090195795 | Font and Line Art Rendering for Multi-Bit Output Devices - Multilevel color page image rendering via multi-bit output devices including the rounding of tone levels, dual tone scan patterns and the selecting or generating of halftone cells and electrophotography engines and image processors for rendering multilevel tone density objects such as font and line art. | 08-06-2009 |
| 20100027074 | PARTITION HALFTONE FOR MULTI-TONE LEVEL OUTPUT DEVICE - An image processing system includes a printing device configured to print a halftone dot using multi-tone levels. The halftone dot is made up of a plurality of pixels, and each pixel is associated with a corresponding tone level. The image processing system further includes a processor. The processor is configured to receive a request to print a bitmap including one or more colors and to identify a grey level for each of the one or more colors. One of the multi-tone levels is associated with the identified grey level, and a halftone matrix is selected for the associated multi-tone level. Each of the multi-tone levels is associated with a different halftone matrix. The processor is further configured to compare the identified grey level with a plurality of pixel threshold values of the selected halftone matrix to determine the corresponding tone level of each of the plurality of pixels. | 02-04-2010 |
| 20100134809 | GAMMA CORRECTION METHOD FOR ERROR DIFFUSION - An image processing system includes a printing device having a printing resolution, and a processor. The processor is configured to receive input image data comprising an input tone, and to dither the input image data at a halftone resolution, wherein the halftone resolution is less than the printing resolution of the printing device. The processor is further configured to perform multi-thresholding of the image data to identify a multi-pixel output tone level, and to generate output image data comprising the multi-pixel output tone level. The output image data is printed at the printing resolution. The multi-thresholding of the image data may further include an error diffusion algorithm providing gamma correction of the input tone. | 06-03-2010 |
| 20100245924 | Multi-Level Surround Error Diffusion - Machine-enabled methods of, and system, and processor readable media, embodiments for, tone quantization error diffusion. | 09-30-2010 |
| 20100246987 | Surround Error Diffusion - Machine-enabled methods of, and system, and processor readable media, embodiments for, tone quantization error diffusion. | 09-30-2010 |
