公开(公告)号：US10986250B1

公开(公告)日：2021-04-20

申请号：US16830419

申请日：2020-03-26

Applicant: Xerox Corporation

Inventor： David J. Metcalfe ,  Peter D. McCandlish

IPC: H04N1/60 ,  H04N1/407

Abstract: An image processing device and method are provided for adjusting background pixels of an image. The device includes memory which stores a background adjustment component which for each of a plurality of pixels of an input image: computes a background strength of the pixel; computes a luminance strength of the pixel; and computes adjusted luminance and adjusted chrominance values for the pixel, as a function of the background strength and luminance strength of the pixel. An image output component outputs an output image derived from the adjusted luminance and adjusted chrominance values for the plurality of pixels, A processor implements the background adjustment component and image output component.

公开(公告)号：US10919310B1

公开(公告)日：2021-02-16

申请号：US16704370

申请日：2019-12-05

Applicant: Xerox Corporation

Inventor： Stuart A. Schweid ,  Raymond J. Clark ,  David J. Metcalfe

IPC: B41J2/21 ,  B41J29/393 ,  B41J2/01 ,  B41J2/36

Abstract: A method of printer operation identifies inkjets to operate in each scanline to eject sneeze drops or, in an alternative approach, identifies the cross-process direction scanlines within a page to be printed by the printer where each inkjet ejects sneeze drops. The methods use a binary grayscale code counter that generates a sequence of binary grayscale code numbers and every other output of the sequence is bit reversed to spread the sneeze drops over the pages of the printer output so the sneeze drops are not perceptible to a human observer.

公开(公告)号：US09975330B1

公开(公告)日：2018-05-22

申请号：US15489390

申请日：2017-04-17

Applicant: Xerox Corporation

Inventor： David J. Metcalfe ,  Douglas D. Darling ,  David A. Mantell

IPC: B41J2/045

CPC classification number: B41J2/04536 ,  B41J2/04581 ,  B41J2/04596 ,  B41J2/165

Abstract: A method for operating an inkjet printhead includes identifying a number of ink drop ejections for an inkjet in the printhead to form a printed image with reference to image data corresponding to the printed image and generating control data that specify a sequence of a plurality of non-firing electrical signals to be applied to the inkjet with reference to a predetermined control sequence stored in a memory and the number of ink drop ejections. The method further includes generating non-firing electrical signals applied to the inkjet with reference to the control data and generating a plurality of firing electrical signals applied to the inkjet to eject ink drops after generating every non-firing electrical signal in the plurality of non-firing electrical signals.

公开(公告)号：US09573382B1

公开(公告)日：2017-02-21

申请号：US15058972

申请日：2016-03-02

Applicant: Xerox Corporation

Inventor： David J. Metcalfe

IPC: B41J2/21

CPC classification number: B41J2/2103 ,  B41J2/2054 ,  B41J2/2121 ,  B41J2/2139 ,  B41J2/2146 ,  B41J2025/008

Abstract: A method of compensating for an inoperable inkjet in an inkjet printer that forms printed images with multiple drop sizes has been developed. The method includes identifying at least one neighboring pixel in a region of multi-bit halftoned image data around a pixel corresponding to the inoperable inkjet and modifying the at least one neighboring pixel to enable an inkjet that neighbors the inoperable inkjet to eject an ink drop during printing operation to compensate for the inoperable inkjet.

Abstract translation: 已经开发了在形成具有多个墨滴尺寸的印刷图像的喷墨打印机中补偿不能操作的喷墨的方法。 该方法包括识别围绕与不可操作的喷墨相对应的像素的多位半色调图像数据的区域中的至少一个相邻像素，并且修改该至少一个相邻像素，以使能够使不可操作的喷墨器相邻的喷墨器能够在 打印操作来补偿不可操作的喷墨。

公开(公告)号：US20160275644A1

公开(公告)日：2016-09-22

申请号：US14662366

申请日：2015-03-19

Applicant: Xerox Corporation

Inventor： Ryan D. Metcalfe ,  David J. Metcalfe

IPC: G06T3/40 ,  G06T7/00

CPC classification number: G06T3/4007

Abstract: Image scaling disclosed herein comprises receiving an image from an image capturing device and partitioning an image into at least one image tile using a partitioning module. A determination is made if the image tile requires slow scan scaling and/or fast scan scaling. The image tile is subject to slow scan scaling. The image tile is then transposed, scaled in the fast scan direction, and then again transposed to an original orientation. The tile is reassembled into a scaled image and may be rendered by a rendering device.

Abstract translation: 本文公开的图像缩放包括从图像捕获装置接收图像并且使用分区模块将图像划分为至少一个图像块。 如果图像块需要慢速扫描缩放和/或快速扫描缩放，则确定。 图像瓦片受到慢扫描缩放。 然后将图像块转置，在快速扫描方向上缩放，然后再次转置到原始方向。 瓦片被重新组装成缩放的图像，并且可以由渲染设备呈现。

公开(公告)号：US10986249B1

公开(公告)日：2021-04-20

申请号：US16830479

申请日：2020-03-26

Applicant: Xerox Corporation

Inventor： David J. Metcalfe

IPC: H04N1/58 ,  H04N1/60 ,  H04N1/00

Abstract: An image processing device includes a neutral edge detection and enhancement component which, for pixels of an input image, computes an edge strength for the pixel as a function of differences between the input luminance value of the pixel and input luminance values of neighboring pixels, computes a neutral adjustment factor for the pixel as a function of the input luminance value of the pixel, and computes a chroma adjustment factor for the pixel as a function of the input chrominance values of the pixel. An adjusted luminance value for the pixel is computed as a function of the input luminance value, the edge strength, and the neutral adjustment factor. Adjusted chrominance values for the pixel may be computed as a function of the input chrominance value, the edge strength, and the chroma adjustment factor. The system allows detection and enhancement of neutral edges in monochrome and color images.

公开(公告)号：US09679356B2

公开(公告)日：2017-06-13

申请号：US14662366

申请日：2015-03-19

Applicant: Xerox Corporation

Inventor： Ryan D. Metcalfe ,  David J. Metcalfe

IPC: G06T3/40

CPC classification number: G06T3/4007

Abstract: Image scaling disclosed herein comprises receiving an image from an image capturing device and partitioning an image into at least one image tile using a partitioning module. A determination is made if the image tile requires slow scan scaling and/or fast scan scaling. The image tile is subject to slow scan scaling. The image tile is then transposed, scaled in the fast scan direction, and then again transposed to an original orientation. The tile is reassembled into a scaled image and may be rendered by a rendering device.

公开(公告)号：US08894179B1

公开(公告)日：2014-11-25

申请号：US13924872

申请日：2013-06-24

Applicant: Xerox Corporation

Inventor： David J. Metcalfe ,  Stephen M. Kroon

IPC: B41J29/393 ,  B41J2/21 ,  B41J2/045

CPC classification number: B41J2/2139 ,  B41J2/0451 ,  B41J2/04541 ,  B41J2/04546 ,  B41J2/2146

Abstract: An apparatus enables a printer to identify neighboring inkjets to compensate for inoperative inkjets with reference to different search patterns. The apparatus includes a plurality of mutliplexers, a memory, a decoder, and a controller. The multiplexers are operatively connected to the memory to receive data that selects one of a plurality of image data pixels on the inputs of the multiplexers. The outputs of the multiplexers are concatenated in a predetermined order and the decoder identifies a highest priority image data pixel available for inoperative inkjet compensation. The controller operates the memory to output the data stored at the plurality of storage locations in a first sequence to enable the multiplexers to output the image data pixels in the predetermined order for the decoder.

Abstract translation: 一种装置使得打印机可以参考不同的搜索模式来识别相邻的喷墨枪以补偿不工作的喷墨喷墨。 该装置包括多个多路复用器，存储器，解码器和控制器。 多路复用器可操作地连接到存储器以接收选择多路复用器的输入端上的多个图像数据像素中的一个的数据。 多路复用器的输出以预定顺序连接，并且解码器识别可用于无效喷墨补偿的最高优先级图像数据像素。 控制器操作存储器以第一序列输出存储在多个存储位置处的数据，以使多路复用器以解码器的预定顺序输出图像数据像素。

公开(公告)号：US20150229807A1

公开(公告)日：2015-08-13

申请号：US14179111

申请日：2014-02-12

Applicant: Xerox Corporation

Inventor： David J. Metcalfe ,  Ryan D. Metcalfe

IPC: H04N1/405

CPC classification number: H04N1/4052 ,  H04N1/393 ,  H04N1/4053

Abstract: Methods and systems for processing a low resolution image via a low resolution error diffusion algorithm. A low resolution binary output pixel can be generated utilizing a general error diffusion algorithm. The low-resolution binary output pixel can be converted to a predetermined number of interpolated sub-pixel values and each interpolated sub-pixel values can be compared with a threshold in order to generate a scaled slow-scan output pixel utilizing the low resolution error diffusion algorithm. The low resolution error diffusion algorithm includes a highlight threshold adjustment module that adjusts the threshold level in order to prevent the scaled slow-scan output pixel from firing around the low resolution binary output pixel within a highlight region. A slow scan error with respect to the scaled slow-scan output pixel can be distributed and stored via error diffusion filter coefficients within an error buffer without additional memory.

Abstract translation: 通过低分辨率误差扩散算法处理低分辨率图像的方法和系统。 可以利用一般的误差扩散算法来生成低分辨率二进制输出像素。 可以将低分辨率二进制输出像素转换成预定数量的内插子像素值，并且可以将每个内插子像素值与阈值进行比较，以便利用低分辨率误差扩散来生成缩放的慢扫描输出像素 算法。 低分辨率误差扩散算法包括调整阈值电平的高亮度阈值调节模块，以便防止缩放的慢扫描输出像素围绕高亮区域内的低分辨率二进制输出像素点燃。 相对于缩放的慢扫描输出像素的慢扫描误差可以通过错误扩散滤波器系数分布并存储在错误缓冲器内而不需要额外的存储器。

公开(公告)号：US20140210898A1

公开(公告)日：2014-07-31

申请号：US13754262

申请日：2013-01-30

Applicant: XEROX CORPORATION

Inventor： David A. Mantell ,  David J. Metcalfe ,  Martin L. Frachioni ,  Raymond J. Clark

IPC: B41J2/125

CPC classification number: B41J2/17566 ,  B41J2002/17569

Abstract: An inkjet printer estimates ink usage in the printer with reference to image pixels and a history of inkjet firing for each inkjet. The printer includes an apparatus that generates an ink mass for each image pixel with reference to the image pixel and a predetermined number of previously ejected image pixels and identifies a total ink mass measurement for a printhead with reference to the ink masses generated for the image pixels of an image to be printed by the inkjet printer.

Abstract translation: 喷墨打印机参照图像像素和每种喷墨的喷墨烧写历史来估计打印机中的墨水使用量。 该打印机包括参考图像像素和预定数量的先前喷射的图像像素产生每个图像像素的油墨质量的装置，并参照为图像像素产生的油墨质量来识别打印头的总油墨质量测量 由喷墨打印机打印的图像。