公开(公告)号：US07505177B2

公开(公告)日：2009-03-17

申请号：US11289145

申请日：2005-11-29

申请人： Jörg Olaf Von Wechgeln ,  Michael Hansen

发明人： Jörg Olaf Von Wechgeln ,  Michael Hansen

IPC分类号： H04N1/405

CPC分类号： H04N1/4051

摘要： A method for generating a threshold value matrix is used in the frequency-modulated half-toning of the image data to be reproduced. A threshold value matrix for a basic screen is generated in that low-pass filters of different width are applied to the bit patterns generated and the threshold value distribution is changed on the basis of the filtered results. Furthermore, the bit patterns generated are examined for specific part patterns and the threshold value distribution is changed in such a way that undesired part patterns no longer occur and, instead, desired part patterns, preferably rounded forms, are contained in the bit patterns generated. By use of a combination of scaling and/or rotation and/or mirroring of the threshold value matrix of the basic screen, threshold value matrices are generated for the printing inks.

摘要翻译： 在要再现的图像数据的调频半色调中使用生成阈值矩阵的方法。 产生用于基本屏幕的阈值矩阵，因为不同宽度的低通滤波器被应用于所生成的位图案，并且基于滤波结果改变阈值分布。 此外，针对特定部位模式检查所产生的位模式，并且以不再发生不期望的部分模式的方式改变阈值分布，并且相反地，在生成的位模式中包含期望的部分模式，优选舍入形式。 通过使用基本屏幕的阈值矩阵的缩放和/或旋转和/或镜像的组合，为印刷油墨生成阈值矩阵。

公开(公告)号：US07933466B2

公开(公告)日：2011-04-26

申请号：US10811475

申请日：2004-03-24

申请人： Michael Hansen ,  Jörg Olaf Von Wechgeln

发明人： Michael Hansen ,  Jörg Olaf Von Wechgeln

IPC分类号： G06K9/40

CPC分类号： G06K9/38 ,  G06T5/008 ,  H04N1/4055 ,  H04N5/20 ,  H04N5/202

摘要： A method of gray value correction for binary image data, preferably screened image data, with a local gray value by a desired correction magnitude includes filtering the image data quantized with n bits with an asymmetrical low-pass filter whose filter window is smaller than a screen cell. By a threshold value operation, corrected binary image data is obtained from the filtered image data. Optimum threshold values are selected from a threshold value table as a function of the local gray value and of the desired correction magnitude.

摘要翻译： 对于具有局部灰度值所需的校正幅度的二进制图像数据，优选地屏蔽图像数据的灰度值校正方法包括用滤波器窗口小于屏幕的非对称低通滤波器对n位量化的图像数据进行滤波 细胞。 通过阈值操作，从经滤波的图像数据获得校正后的二进制图像数据。 从阈值表中选择最佳阈值作为局部灰度值和期望的校正量值的函数。

公开(公告)号：US06476936B1

公开(公告)日：2002-11-05

申请号：US09403671

申请日：1999-12-07

申请人： Jörg Olaf Von Wechgeln

发明人： Jörg Olaf Von Wechgeln

IPC分类号： H04N100

CPC分类号： H04N1/40075

摘要： A method for opto-electronic scanning, by pixel and by line, of screened master photographic images with a sensing device. From the actual scanning, at least one master photographic image area that contains the grid scale is detected in the screened master photographic image. Subsequently, the picture values present in the local area of the detected grid scale area of the master photographic image are transferred by Fourier transformation to the frequency range as a spatial frequency spectrum, and, from the spatial frequency spectrum, the screen ruling and raster angle of the raster of the master photographic image are determined. For the determined raster angle and the determined screen rulings of the grid scale of the master photographic image, the optimal scan frequencies for Moiré-free scanning are determined from the spatial frequency spectrum. The optimal scan frequencies which determined the scanning fineness are set at the sensing device and then the screened master photographic image is scanned with the set optical scan frequencies, to obtain the picture values necessary for reproduction of the screened master photographic image.

摘要翻译： 通过像素和逐行扫描的主摄影图像与感测装置的光电扫描方法。 从实际扫描中，在被筛选的主摄影图像中检测到包含网格标尺的至少一个主摄影图像区域。 随后，通过傅里叶变换将出现在主摄影图像的检测到的网格尺度区域的局部区域中的图像值作为空间频谱传送到频率范围，并且从空间频谱，屏幕尺度和光栅角度 确定主摄影图像的光栅。 对于所确定的光栅角度和主摄影图像的网格尺度的确定的屏幕尺度，从空间频谱确定无摩尔扫描的最佳扫描频率。 将确定扫描细度的最佳扫描频率设置在感测装置处，然后用设定的光学扫描频率扫描被筛选的主摄影图像，以获得再现筛选的主摄影图像所需的图像值。

公开(公告)号：US06697168B2

公开(公告)日：2004-02-24

申请号：US09740650

申请日：2000-12-18

申请人： Jörg Olaf Von Wechgeln

发明人： Jörg Olaf Von Wechgeln

IPC分类号： H04N1407

CPC分类号： H04N1/4055

摘要： A method for calibrating image recording equipment is described. According to the method, raster areas such as images or color prints are recorded pixel by pixel, line by line in the form of screen dots on an image support by use of at least one exposure beam generated in an exposure unit. An image stored as a bit-map image and containing line data (binary image) is divided into fields. A raster percentage is determined for every field by calculating an average. A variation in the raster percentage is determined from a density-exposure curve. The parameters required for the variation are calculated by an algorithm and memorized in a variation table. The most suitable algorithm is read from the variation table and executed and the data determined thereby are memorized.

摘要翻译： 描述了用于校准图像记录设备的方法。 根据该方法，通过使用在曝光单元中产生的至少一个曝光束，以图像支持上的屏幕点的形式逐行地逐行记录诸如图像或彩色打印的光栅区域。 存储为位图图像并包含行数据（二进制图像）的图像被分为字段。 通过计算平均值为每个字段确定栅格百分比。 光栅百分比的变化由密度 - 曝光曲线确定。 通过算法计算变化所需的参数，并记录在变化表中。 从变化表读取最合适的算法，并执行，从而存储由此确定的数据。