公开(公告)号：US20040136015A1

公开(公告)日：2004-07-15

申请号：US10342873

申请日：2003-01-15

Applicant: XEROX CORPORATION

Inventor： Jean-Pierre R.M. Van de Capelle ,  Lalit K. Mestha ,  Robert P. Loce ,  Raja Bala ,  Martin S. Maltz ,  Peter A. Crean

IPC: H04N001/60 ,  H04N001/52

CPC classification number: H04N1/4078 ,  H04N1/6033

Abstract: A system and method for printer control and color balance calibration. The system and method address the image quality problems of print engine instability, low quality of color balance and contouring from the calibration. The method includes defining combinations of colorants, such as inks or toners that will be used to print images, defining a desired response for the combinations that are to be used and, in real time, iteratively printing CMY halftone color patches, measuring the printed patches via an in situ sensor and iteratively performing color-balance calibration based on the measurements, accumulating corrections until the measurements are within a predetermined proximity of the desired response. The calibration is performed on the halftones while they are in a high quantization resolution form.

Abstract translation: 一种用于打印机控制和色平衡校准的系统和方法。 该系统和方法解决了打印引擎不稳定的图像质量问题，色彩平衡质量差和校准轮廓。 该方法包括定义着色剂的组合，例如将用于打印图像的油墨或调色剂，为要使用的组合定义期望的响应，并且实时迭代地打印CMY半色调色块，测量印刷的贴片 通过原位传感器并且基于测量迭代地执行色平衡校准，累积校正直到测量值在所需响应的预定接近度内。 校准在半色调上进行，而它们处于高量化分辨率形式。

公开(公告)号：US20040071366A1

公开(公告)日：2004-04-15

申请号：US10268271

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Yeqing Zhang ,  Gaurav Sharma ,  Robert P. Loce ,  Steven J. Harrington

IPC: G06K009/36

CPC classification number: H04N1/4446

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image in a physical form, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. The composite image is generated using an image-dependent dynamic range determination so as to provide a maximum usable contrast in a recovered source image.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于以物理形式呈现合成图像，或用于从所渲染的复合物中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 使用依赖于图像的动态范围确定来生成合成图像，以便在恢复的源图像中提供最大可用对比度。

公开(公告)号：US20040070588A1

公开(公告)日：2004-04-15

申请号：US10268295

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Steven J. Harrington ,  Robert P. Loce ,  Gaurav Sharma

IPC: G09G005/00

CPC classification number: G02B27/2221 ,  G03B35/18 ,  H04N13/334

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image in a physical form, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. Stereogram generation techniques can be employed to provide the image content of one or more stereogram source images encoded in the composite image. When the composite image is subjected to illumination by a narrow band illuminant, an observer can identify the pattern correspondence necessary for comprehending the image content of the stereogram source image.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于以物理形式呈现合成图像，或用于从所渲染的复合物中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 可以采用立体图生成技术来提供在合成图像中编码的一个或多个立体图像源图像的图像内容。 当合成图像经受窄带光源的照明时，观察者可以识别理解立体图像图像的图像内容所必需的图案对应关系。

公开(公告)号：US20040042678A1

公开(公告)日：2004-03-04

申请号：US10231220

申请日：2002-08-30

Applicant: XEROX CORPORATION

Inventor： Robert P. Loce ,  Beilei Xu ,  Jason Repko

IPC: G06T005/00 ,  H04N001/409

CPC classification number: G06T5/006 ,  G06K9/3283 ,  G06T3/0031 ,  H04N1/387

Abstract: Methods and systems for dewarping images allow a user to reduce distortion in scanned images. A scanned image is processed using an optics model and an illumination model, and resampled to reduce distortion. The dewarping may be improved through iterative operations where a model parameter is varied. An optimal image is obtained which corresponds to a maximum metric as a measure of the quality of a resampled image.

Abstract translation: 用于杜绝图像的方法和系统允许用户减少扫描图像中的失真。 使用光学模型和照明模型处理扫描图像，并重新采样以减少失真。 可以通过改变模型参数的迭代操作来改进杜瓦平。 获得对应于作为重采样图像的质量的度量的最大度量的最佳图像。

公开(公告)号：US20020085248A1

公开(公告)日：2002-07-04

申请号：US09750568

申请日：2000-12-28

Applicant: XEROX CORPORATION

Inventor： Beilei Xu ,  Robert P. Loce

IPC: H04N001/46

CPC classification number: H04N1/401 ,  H04N1/4072

Abstract: A method of correcting illumination variation in a scanned image of a non-planar original object, such as an open book, includes scanning at least a portion of the book in order to produce scanned image data. Illumination variation data is extracted from the scanned image data and used to derive a plurality of illumination compensation values. The scanned image data is then compensated or scaled in accordance with the illumination compensation values. Illumination data is acquired through a sampling window having a long and thin geometry. From the data acquired via the sampling window, foreground and background illumination distributions are defined. From the foreground and background illuminations, high and low threshold values are determined in order to calculate a set of reference or compensation values. A tone reproduction curve is generated in order to map the scanned data, thus normalizing the illumination variation. Alternately, an illumination gain factor is employed in the compensation.

Abstract translation: 一种校正非平面原始物体（例如打开的书本）的扫描图像中的照明变化的方法包括扫描书本的至少一部分以产生扫描图像数据。 从扫描图像数据中提取照明变化数据，并用于导出多个照明补偿值。 扫描的图像数据然后根据照明补偿值进行补偿或缩放。 通过具有长而薄的几何形状的采样窗口获取照明数据。 通过采样窗口获得的数据，定义了前景和背景照明分布。 从前景和背景照明，确定高和低阈值以便计算一组参考或补偿值。 产生色调再现曲线以便映射扫描的数据，从而使照明变化标准化。 或者，在补偿中采用照明增益因子。

公开(公告)号：US20020085247A1

公开(公告)日：2002-07-04

申请号：US09750540

申请日：2000-12-28

Applicant: XEROX CORPORATION

Inventor： Beilei Xu ,  Robert P. Loce

IPC: H04N001/46

CPC classification number: H04N1/00005 ,  H04N1/00002 ,  H04N1/00013 ,  H04N1/00034 ,  H04N1/00047 ,  H04N1/0005 ,  H04N1/00063 ,  H04N1/00068 ,  H04N1/00082 ,  H04N1/387 ,  H04N1/401 ,  H04N1/4092

Abstract: A method of estimating local defocus distance from a conventionally scanned image is provided. More particularly, the method of estimating defocus distance in a scanned image of a non-planar original object, such as an open book, includes scanning at least a portion of the book in order to produce scanned image data. An image feature obtainable from the scanned image data and a quantitative metric corresponding to the image feature are selected. Image feature data is extracted from the scanned image data and compared to a predetermined calibration relationship between the selected image feature and defocus distance in order to calculate a plurality of defocus distances, which are organized into a defocus distance map. The defocus distance map may be used in the subsequent correction of geometric distortions, blurring defects, and illumination variations adjacent the binding of an open book.

Abstract translation: 提供了一种从常规扫描图像估计局部散焦距离的方法。 更具体地，估计非平面原始物体（例如打开的书）的扫描图像中的离焦距离的方法包括扫描书本的至少一部分以产生扫描图像数据。 选择从扫描图像数据可获得的图像特征和与图像特征相对应的定量度量。 从扫描图像数据中提取图像特征数据，并将其与所选择的图像特征和散焦距离之间的预定校准关系进行比较，以便计算被组织成散焦距离图的多个散焦距离。 散焦距离图可以用于随后校正几何失真，模糊缺陷以及与打开的书的绑定相邻的照明变化。

公开(公告)号：US20020067404A1

公开(公告)日：2002-06-06

申请号：US09731158

申请日：2000-12-06

Applicant: XEROX CORPORATION

Inventor： Robert P. Loce

IPC: B41J002/41 ,  G06K015/14 ,  H04N001/29 ,  G03G015/043

CPC classification number: H04N1/29

Abstract: A xerographic marking device includes a source of pixels representative of digitized image information. A rendering image processor analyzes the pixels for an image characteristic, and based on the analysis assigns one of at least three values to each pixel. The three values are selected from a set of values representing positive, negative or neutral relative to a predetermined exposure bias. The device also includes an imaging output device which converts the values assigned to the pixels into areas of selective exposure on a charge retentive surface. A charge on the charge retentive surface such as a photoreceptor accordingly, includes an area of positive charge determined to electrostatically react with a charged monochrome marking agent or toner in a first manner, for example by attraction. The charge also includes a negative charge area which is determined to electrostatically react with the toner in an opposite manner, for example to repel toner. Optionally, the charge also includes an overshoot or super positive/super-negative area. The overshoot areas have stronger electrostatic reactions with the toner than their corresponding positive/negative charges.

Abstract translation: 静电印迹标记装置包括表示数字化图像信息的像素源。 渲染图像处理器分析图像特征的像素，并且基于分析，将至少三个值中的一个值分配给每个像素。 从相对于预定曝光偏差的正，负或中性的一组值中选择三个值。 该装置还包括成像输出装置，其将分配给像素的值转换成电荷保持性表面上的选择性曝光区域。 充电保持性表面上的电荷如感光体相应地包括确定为以第一种方式与充电的单色标记剂或调色剂静电反应的正电荷区域，例如通过吸引。 电荷还包括负电荷区域，其被确定为以相反的方式与调色剂静电反应，例如排斥调色剂。 可选地，电荷还包括过冲或超正/超负面区域。 过冲区域与调色剂的静电反应比其相应的正/负电荷更强。

公开(公告)号：US20040101201A1

公开(公告)日：2004-05-27

申请号：US10304171

申请日：2002-11-25

Applicant: Xerox Corporation

Inventor： Gaurav Sharma ,  Robert P. Loce ,  Steven J. Harrington

IPC: G06K009/36

CPC classification number: H04N1/4446

Abstract: Methods and systems for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image on a substrate, and for recovering at least one of the encoded source images from the rendered composite image. A desired source image is recovered when the rendered composite image is subjected to illumination by one or more illuminants and the desired source image is detected by one or more sensors in an image capture device. The spectral characteristics of the colorants, illuminants, and sensors are employed to spectrally encode the source image in the composite image.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和系统，用于将合成图像呈现在基板上，并用于从所渲染的合成图像中恢复至少一个编码的源图像 。 当所渲染的合成图像经受一个或多个照明物的照明并且所需的源图像由图像捕获装置中的一个或多个传感器检测到时，恢复期望的源图像。 使用着色剂，发光体和传感器的光谱特征对合成图像中的源图像进行光谱编码。

公开(公告)号：US20040071359A1

公开(公告)日：2004-04-15

申请号：US10268333

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Gaurav Sharma ,  Robert P. Loce ,  Steven J. Harrington

IPC: G06K009/40

CPC classification number: H04N1/4446

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image in a physical form, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. For example, when the rendered composite image is subjected to illumination by one of the narrow band illuminants for which a source image was encoded, the source image becomes visually detectable by an observer.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于以物理形式呈现合成图像，或用于从所渲染的复合物中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 例如，当通过编码源图像的窄带光源之一对渲染的合成图像进行照明时，源图像由观察者可视地检测。

公开(公告)号：US20040057080A1

公开(公告)日：2004-03-25

申请号：US10694494

申请日：2003-10-27

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Clara Cuciurean-Zapan

IPC: H04N001/405 ,  H04N001/409 ,  G06T005/00

CPC classification number: H04N1/4092 ,  G06K15/1826 ,  G06T5/002 ,  G06T5/003 ,  G06T5/30 ,  G06T2207/20192 ,  G06T2207/30144 ,  G06T2207/30176 ,  H04N1/58

Abstract: Selective edge softening and selective edge dithering is introduced into an image representation to improve local control where halo problems are expected. Selective areas of dilation are isolated and separately dithered or halftoned, the result of which is then swapped back into or substituted for the stored original image. In this manner misregistration and color plane-to-plane interactions can be compensated for in plural image forming station architecture systems. The same technique is also valuable in monochrome systems as an aid to overcoming edge displacement and slow toner problems when the selective edge softening is selectively applied to edges which are in particular perpendicular to the fast scan direction.