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    • 4. 发明授权
    • Systems and methods for obtaining image shear and skew
    • 用于获得图像剪切和偏斜的系统和方法
    • US07120314B2
    • 2006-10-10
    • US10342357
    • 2003-01-15
    • Stuart A. SchweidRamesh NagarajanRoger L. Triplett
    • Stuart A. SchweidRamesh NagarajanRoger L. Triplett
    • G06K9/36H04N1/04G06K9/20
    • G06T3/608H04N1/3878
    • In a machine-fed scanner, orientation angles of edges of an image bearing substrate are obtained and used to calculate image shear and/or skew. A running weighted average of the image skew may be kept in a memory. When a skew value is obtained for a given image, it may be determined whether the skew value is within a predetermined range. If the skew value is within the predetermined range, the skew value is used to determine an image revision to compensate for the skew, and the skew value is incorporated into the running weighted average skew. If the skew value is not within the predetermined range, it is discarded and the running weighted average skew is used to determine an appropriate image skew revision. The running weighted average of the shear may also be kept in a memory. A shear value is obtained for each image, and incorporated into the running weighted average shear. Shear revision is performed based on the running weighted average shear. A determination may be made whether the shear value for a current image is within a predetermined range, and the running weighted average shear may be updated based on the shear value for the current image if the shear value for the current image is within the predetermined range.
    • 在机器馈送的扫描仪中,获得图像承载基底的边缘的取向角并用于计算图像剪切和/或偏斜。 图像偏移的运行加权平均值可以保存在存储器中。 当给定图像获得偏斜值时,可以确定偏斜值是否在预定范围内。 如果偏斜值在预定范围内,则偏斜值用于确定图像修正以补偿偏斜,并且偏斜值被合并到运行加权平均偏差中。 如果偏斜值不在预定范围内,则将其丢弃,并使用运行加权平均偏差来确定适当的图像偏斜修正。 剪切的运行加权平均值也可以保存在存储器中。 对于每个图像获得剪切值,并将其并入运行加权平均剪切。 基于运行的加权平均剪切力来进行剪切修正。 可以确定当前图像的剪切值是否在预定范围内,并且如果当前图像的剪切值在预定范围内,则可以基于当前图像的剪切值更新运行加权平均剪切 。
    • 7. 发明申请
    • REAL-TIME PROCESSING OF GRAYSCALE IMAGE DATA
    • 灰度图像数据的实时处理
    • US20090185228A1
    • 2009-07-23
    • US12418419
    • 2009-04-03
    • Xing LiDaniel A. MohabirRoger L. Triplett
    • Xing LiDaniel A. MohabirRoger L. Triplett
    • H04N1/405G09G5/02
    • H04N1/3873H04N1/3878
    • In a digital reproduction system incorporating a single pass scanner, accurate image processing results from processing a subset of grayscale image data. More specifically, scanlines that correspond to the leading edge of a document are stored and processed to detect skew and to obtain an appropriate correction. The lead edge correction is then applied to the entire grayscale image. Accordingly, the present systems and methods eliminate skew from grayscale images in real-time. The corrected image is rendered to binary and stored in electronic pre-collation memory and cropping, masking and other image editing operations can be performed on the binary image data before the image is printed.
    • 在包含单遍扫描仪的数字再现系统中,通过处理灰度图像数据的子集得到准确的图像处理。 更具体地,对应于文档的前沿的扫描线被存储和处理以检测偏斜并获得适当的校正。 然后将前沿校正应用于整个灰度图像。 因此,本系统和方法实时地从灰度图像中消除偏差。 将校正后的图像呈现为二进制并存储在电子预处理存储器中,并且可以在打印图像之前对二进制图像数据执行裁剪,掩蔽和其他图像编辑操作。
    • 8. 发明授权
    • Method and system for hybrid error diffusion processing of image
information using dynamic screens based on brightness/darkness settings
    • 使用基于亮度/黑度设置的动态屏幕对图像信息进行混合误差扩散处理的方法和系统
    • US5805724A
    • 1998-09-08
    • US719097
    • 1996-09-24
    • David J. MetcalfeRoger L. TriplettJohn T. NewellXiao-fan Feng
    • David J. MetcalfeRoger L. TriplettJohn T. NewellXiao-fan Feng
    • H04N1/405G06K9/38G06T5/00
    • H04N1/4053
    • A printing system for rendering marks on a recording medium receives a multi-level grey scale pixel value representing a pixel having a first resolution. A screening circuit generates a screened multi-level grey scale pixel value equal to (G.sub.L -V.sub.i)+(S.sub.i -Th)*Dmp.sub.vi *Mod.sub.Eff wherein G.sub.L is the maximum grey level value of the pixel, V.sub.i is equal to the multi-level grey scale pixel value of the first resolution, S.sub.i is equal to a screen value corresponding to a position of the pixel, the image classification of the pixel and a brightness/darkness setting, The threshold value, Dmp.sub.vi is a video dependent dampening factor, and Mod.sub.Eff is a modulation multiplication factor. An interpolator converts the screened multi-level grey scale pixel value to a second resolution, the second resolution being higher than the first resolution, and a binarization circuit binarizes the converted multi-level grey scale pixel value so as to output a binary signal and an error value, the error value having a resolution equal to the first resolution. The error value is diffused to multi-level grey scale pixel values corresponding to pixels adjacent to the pixel having the first resolution, and the binary signal is converted into a mark on the recording medium.
    • 用于在记录介质上渲染标记的打印系统接收表示具有第一分辨率的像素的多级灰度像素值。 筛选电路产生等于(GL-Vi)+(Si-Th)* Dmpvi * ModEff的屏蔽多级灰度像素值,其中GL是像素的最大灰度级值,Vi等于多级 第一分辨率的灰阶像素值,Si等于对应于像素的位置,像素的图像分类和亮度/暗度设置的屏幕值。阈值Dmpvi是视频相关的衰减因子,以及 ModEff是调制倍增因子。 内插器将所筛选的多级灰阶像素值转换为第二分辨率,第二分辨率高于第一分辨率,二值化电路对转换后的多级灰阶像素值进行二值化处理,以输出二进制信号和 误差值,误差值具有等于第一分辨率的分辨率。 误差值扩散到与具有第一分辨率的像素相邻的像素对应的多级灰度像素值,并且二进制信号被转换成记录介质上的标记。