公开(公告)号：US08368964B2

公开(公告)日：2013-02-05

申请号：US12536967

申请日：2009-08-06

申请人： Beilei Xu ,  Robert Paul Loce ,  Chu-Heng Liu ,  Ying-wei Lin

发明人： Beilei Xu ,  Robert Paul Loce ,  Chu-Heng Liu ,  Ying-wei Lin

IPC分类号： H04N1/40

CPC分类号： H04N1/387 ,  G06T5/003 ,  G06T5/50 ,  G06T2207/10008 ,  G06T2207/10148 ,  G06T2207/30176

摘要： A method for determining local defocus distance in a scanned image of a non-planar original object is provided comprising scanning at least a portion of the non-planar original object to produce first scanned image data at a first focal plane and scanning same the at least a portion of the non-planar original object to produce at least second scanned image data at a second focal plane. The first scanned image data is different from the second scanned image data wherein a distance between the first focal plane and the second focal plane is a predetermined quantity. The method further comprises estimating an out-of-focus distance of the object from the first and the second scanned image data.

摘要翻译： 提供了一种用于确定非平面原始对象的扫描图像中的局部散焦距离的方法，包括扫描非平面原始对象的至少一部分以在第一焦平面处产生第一扫描图像数据，并至少扫描至少 所述非平面原始对象的一部分在第二焦平面处产生至少第二扫描图像数据。 第一扫描图像数据与第二扫描图像数据不同，其中第一焦平面和第二焦平面之间的距离是预定量。 该方法还包括估计物体与第一和第二扫描图像数据的离焦距离。

公开(公告)号：US20110032575A1

公开(公告)日：2011-02-10

申请号：US12536967

申请日：2009-08-06

申请人： Beilei Xu ,  Robert Paul Loce ,  Chu-heng Liu ,  Ying-wei Lin

发明人： Beilei Xu ,  Robert Paul Loce ,  Chu-heng Liu ,  Ying-wei Lin

IPC分类号： H04N1/409 ,  G06K9/40

CPC分类号： H04N1/387 ,  G06T5/003 ,  G06T5/50 ,  G06T2207/10008 ,  G06T2207/10148 ,  G06T2207/30176

摘要： A method for determining local defocus distance in a scanned image of a non-planar original object is provided comprising scanning at least a portion of the non-planar original object to produce first scanned image data at a first focal plane and scanning same the at least a portion of the non-planar original object to produce at least second scanned image data at a second focal plane. The first scanned image data is different from the second scanned image data wherein a distance between the first focal plane and the second focal plane is a predetermined quantity. The method further comprises estimating an out-of-focus distance of the object from the first and the second scanned image data.

摘要翻译： 提供了一种用于确定非平面原始对象的扫描图像中的局部散焦距离的方法，包括扫描非平面原始对象的至少一部分以在第一焦平面处产生第一扫描图像数据，并至少扫描至少 所述非平面原始对象的一部分在第二焦平面处产生至少第二扫描图像数据。 第一扫描图像数据与第二扫描图像数据不同，其中第一焦平面和第二焦平面之间的距离是预定量。 该方法还包括估计物体与第一和第二扫描图像数据的离焦距离。

公开(公告)号：US08432582B2

公开(公告)日：2013-04-30

申请号：US10923116

申请日：2004-08-20

申请人： Yeqing Zhang ,  Robert Paul Loce ,  Beilei Xu

发明人： Yeqing Zhang ,  Robert Paul Loce ,  Beilei Xu

IPC分类号： G06K15/00 ,  H04N1/40

CPC分类号： H04N1/603

摘要： Compensation for rendering device non-uniformities is provided for halftoned images. A spatially dependent tone reproduction curve (TRC) provides compensation values. Pixel location information is used to access TRC values. For example, the values are modification values. The modification values are added to the pixel values to generate combined values. Quantization is applied to the combined values to prepare compensated image data for rendering. For example, Rank Ordered Error Diffusion is applied to the combined values. The combined values may include diffused error from previously processed pixels. Gray values may be estimated for the respective pixels. The estimated gray values may be used to access compensation information from a TRC that is both spatially and gray value dependent. Mathematical basis decomposition is used to reduce TRC memory requirements. For example, Discrete Cosine Transformation, Singular Value Decomposition or Principal Component Analysis is used to determine a compact form for the TRC.

摘要翻译： 为半色调图像提供渲染设备不均匀性的补偿。 空间依赖色调再现曲线（TRC）提供补偿值。 像素位置信息用于访问TRC值。 例如，值是修改值。 将修改值添加到像素值以生成组合值。 将量化应用于组合值以准备用于渲染的补偿图像数据。 例如，将秩排序误差扩散应用于组合值。 组合的值可以包括来自先前处理的像素的扩散误差。 可以针对各个像素估计灰度值。 估计的灰度值可用于从空间和灰度依赖的TRC访问补偿信息。 数学基础分解用于减少TRC记忆体要求。 例如，使用离散余弦变换，奇异值分解或主成分分析来确定TRC的紧凑形式。

公开(公告)号：US07894107B2

公开(公告)日：2011-02-22

申请号：US11796397

申请日：2007-04-27

申请人： Anthony Ang ,  Robert Paul Loce ,  Beilei Xu ,  Robert Kleckner

发明人： Anthony Ang ,  Robert Paul Loce ,  Beilei Xu ,  Robert Kleckner

IPC分类号： H04N1/04

CPC分类号： H04N1/40031

摘要： An optical scanning device is provided which comprises a laser array which emits laser beams including a number of beams (1, 2, . . . , n) writing a swath of rasters having a laser scanning section which, when an interlaced scanning period i, is set to a natural number between beams which are adjacent in a sub-scanning direction, scans the laser beams emitted from the laser array with the interlaced scanning period i. The laser scanning section can scan the laser beams such that the beam number n and the interlaced scanning period i are relatively prime natural numbers, and n>i. In a first scan, data for raster lines (1, 2, . . . , n) can be selectively associated with a respective first exposure. At a second scan, data for raster lines (i+1, i+2, . . . , n) can be selectively associated with a respective second exposure and data for raster lines (n+1, n+2, . . . , n+i) can be selectively associated with a respective first exposure. The first respective exposure for raster lines (i+1, i+2, . . . , n) is not equal to the respective second exposure for raster lines (i+1, i+2, . . . , n).

公开(公告)号：US07440139B2

公开(公告)日：2008-10-21

申请号：US11034057

申请日：2005-01-13

申请人： Robert Paul Loce ,  Beilei Xu ,  Reiner Eschbach ,  David J. Lieberman

发明人： Robert Paul Loce ,  Beilei Xu ,  Reiner Eschbach ,  David J. Lieberman

IPC分类号： G06K15/10 ,  G06K9/36 ,  G06K9/38 ,  G06K9/46 ,  H04N1/405 ,  H04N1/40 ,  G09G5/00

CPC分类号： H04N1/407 ,  H04N1/40068 ,  H04N1/4052

摘要： A method of adjusting a TRC of an image is provided. The method involves receiving an image at an input resolution, resampling the image to a processing resolution if the imput resolution and the processing resolution are not same, processing the image using rank-ordered error diffusion, and resampling the processed image to a desired output resolution for the image if the processing resolution and the output resolution are not same.

摘要翻译： 提供了一种调整图像的TRC的方法。 该方法包括以输入分辨率接收图像，如果输入分辨率和处理分辨率不相同，则将图像重新采样到处理分辨率，使用等级错误扩散处理图像，并将处理的图像重新采样到期望的输出分辨率 对于图像，如果处理分辨率和输出分辨率不相同。

公开(公告)号：US07852536B2

公开(公告)日：2010-12-14

申请号：US11108497

申请日：2005-04-18

申请人： Shen-ge Wang ,  Beilei Xu ,  Robert Paul Loce

发明人： Shen-ge Wang ,  Beilei Xu ,  Robert Paul Loce

IPC分类号： H04N1/46

CPC分类号： H04N1/409 ,  H04N1/52

摘要： A method for avoiding objectionable moiré in a color image can include identifying a problematic excitation angle associated with a problematic excitation in a marking process or in the color image and selecting a set of at least two halftone screens for rendering at least two separations of the color image wherein the set of screens is selected to avoid including significant screen fundamental, harmonic and beat frequencies at angles closer than about 1 degree of the identified problematic excitation angle. Halftoning the color image according to the selected set of screens avoids objectionable moiré associated with the problematic excitation.

摘要翻译： 用于避免彩色图像中的令人反感的莫尔条纹的方法可以包括识别与标记过程或彩色图像中的有问题的激励相关联的有问题的激发角度，并且选择一组至少两个半色调屏幕，用于渲染颜色的至少两个分色 图像，其中所述屏幕组被选择以避免在所识别的有问题的激励角度的近似1度的角度包括显着的屏幕基本，谐波和拍频。 根据所选择的一组屏幕对色彩图像进行半色调，避免与有问题的激发相关的令人反感的莫尔。

公开(公告)号：US08208175B2

公开(公告)日：2012-06-26

申请号：US11104758

申请日：2005-04-13

申请人： Beilei Xu ,  Robert Paul Loce

发明人： Beilei Xu ,  Robert Paul Loce

IPC分类号： G06K15/00

CPC分类号： H04N1/4052

摘要： A target pixel is processed according to a blended combination of two or more error diffusion techniques. For example, the two or more techniques may include a standard error diffusion technique and rank ordered error diffusion. Additionally, or alternatively, a quantization resolution is selected for the target pixel based on information regarding the pixel. For example, a quantization resolution is selected based on a relative position of the target pixel or based on a value of the target pixel and/or values of pixels neighboring the target pixel.

摘要翻译： 根据两种或更多种误差扩散技术的混合组合来处理目标像素。 例如，两种或多种技术可以包括标准误差扩散技术和等级有序误差扩散。 另外或者替代地，基于关于像素的信息为目标像素选择量化分辨率。 例如，基于目标像素的相对位置或者基于目标像素的值和/或与目标像素相邻的像素的值来选择量化分辨率。

公开(公告)号：US07460276B2

公开(公告)日：2008-12-02

申请号：US11013787

申请日：2004-12-17

申请人： Beilei Xu ,  David Jordan Lieberman ,  Robert Paul Loce

发明人： Beilei Xu ,  David Jordan Lieberman ,  Robert Paul Loce

IPC分类号： H04N1/405 ,  G06K15/00

CPC分类号： H04N1/4052

摘要： One aspect of the invention provides a method of halftoning an image which involves determining a quantization error for a selected target pixel of an image, selecting a diffusion mask, the mask relating to the target pixel and pixels neighboring thereto, receiving a first pair of neighboring pixel values for a first pixel pair including a first neighboring pixel and a second neighboring pixel, and receiving a second pair of neighboring pixel values for a second pixel pair including a third neighboring pixel and a fourth neighboring pixel. The method further involves determining a ranking order of the first, second, third and fourth neighboring pixels by comparing pixel values of the first, second, third and fourth neighboring pixels, and diffusing error to at least one of the first, second, third and fourth neighboring pixels based on the determined ranking order of the first, second, third and fourth neighboring pixels.

摘要翻译： 本发明的一个方面提供了一种对图像进行半色调的方法，该方法涉及确定图像的所选目标像素的量化误差，选择扩散掩模，与目标像素相关的掩模和与其相邻的像素，接收第一对邻近 包括第一相邻像素和第二相邻像素的第一像素对的像素值，以及接收包括第三相邻像素和第四相邻像素的第二像素对的第二对相邻像素值。 该方法还包括通过比较第一，第二，第三和第四相邻像素的像素值来确定第一，第二，第三和第四相邻像素的排序顺序，以及将误差扩散到第一，第二，第三和第四相邻像素中的至少一个， 基于所确定的第一，第二，第三和第四相邻像素的排序顺序的第四相邻像素。

公开(公告)号：US07133161B2

公开(公告)日：2006-11-07

申请号：US10153355

申请日：2002-05-22

申请人： Beilei Xu ,  Robert Paul Loce

发明人： Beilei Xu ,  Robert Paul Loce

IPC分类号： H04N1/405

CPC分类号： H04N1/40075

摘要： Optimal rehalftone screen frequencies are found by searching frequency space for points that are maximally spaced from significant frequency components of an input image halftone screen or screens. Selecting a rehalftone screen having a maximally spaced frequency produces moiré of the highest frequency possible. High frequency moiré are visually unobjectionable. Optimal rehalftone frequencies may be found near the maximally spaced points where system or other constraints limit the usefulness of the maximally spaced points. Rehalftone screen frequencies in the range of about 1.4 to about 1.8 times the fundamental frequency of the input image halftone screen are often optimal. A rehalftone screen frequency of 1.5 times the fundamental frequency of the input image halftone screen is often optimal when the input image is monochrome and uses a dot screen.

摘要翻译： 通过搜索与输入图像半色调屏幕或屏幕的显着频率分量最大间隔的点的频率空间来找到最佳重呼频率屏幕频率。 选择具有最大间隔频率的重调频屏幕可产生最高频率的莫尔条纹。 高频莫尔条目在视觉上是无敌的。 可以在最大间隔的点附近找到最佳重复频率，其中系统或其他约束限制了最大间隔点的有用性。 通常输入图像半色调屏幕的基频的约1.4至约1.8倍的范围内的重调频屏幕频率是最佳的。 当输入图像为单色并使用点画面时，输入图像半色调屏幕的基频的1.5倍的重复频率屏幕频率通常是最佳的。

公开(公告)号：US08049935B2

公开(公告)日：2011-11-01

申请号：US13007880

申请日：2011-01-17

申请人： Anthony Ang ,  Robert Paul Loce ,  Beilei Xu ,  Robert Kleckner

发明人： Anthony Ang ,  Robert Paul Loce ,  Beilei Xu ,  Robert Kleckner

IPC分类号： H04N1/04

CPC分类号： H04N1/40031

摘要： An optical scanning device is provided which comprises a laser array which emits laser beams including a number of beams (1, 2, . . . , n) writing a swath of rasters having a laser scanning section which, when an interlaced scanning period i, is set to a natural number between beams which are adjacent in a sub-scanning direction, scans the laser beams emitted from the laser array with the interlaced scanning period i. The laser scanning section can scan the laser beams such that the beam number n and the interlaced scanning period i are relatively prime natural numbers, and n>i. In a first scan, data for raster lines (1, 2, . . . , n) can be selectively associated with a respective first exposure. At a second scan, data for raster lines (i+1, i+2, . . . , n) can be selectively associated with a respective second exposure and data for raster lines (n+1, n+2, . . . , n+i) can be selectively associated with a respective first exposure. The first respective exposure for raster lines (i+1, i+2, . . . , n) is not equal to the respective second exposure for raster lines (i+1, i+2, . . . , n).

摘要翻译： 提供了一种光学扫描装置，其包括激光器阵列，其发射包括多个光束（1,2 ...，n）的激光束，所述激光束写入具有激光扫描部分的条纹，当隔行扫描周期i， 被设置为在副扫描方向相邻的光束之间的自然数，以隔行扫描周期i扫描从激光阵列发射的激光束。 激光扫描部分可以扫描激光束，使得光束数n和隔行扫描周期i是相对主要的自然数，并且n> i。 在第一扫描中，用于光栅线（1,2，...，n）的数据可以选择性地与相应的第一曝光相关联。 在第二次扫描中，光栅线（i + 1，i + 2，...，n）的数据可以选择性地与相应的第二曝光相关联，并且可以选择地与光栅线（n + 1，n + 2，...，n）相关联。 ，n + i）可以选择性地与相应的第一曝光相关联。 栅格线（i + 1，i + 2，...，n）的第一个相应的曝光不等于光栅线（i + 1，i + 2，...，n）的相应的第二曝光。