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1.发明授权
公开(公告)号：US4825297A
公开(公告)日：1989-04-25
申请号：US085865
申请日：1987-08-14
CPC分类号： H04N1/4072 , H04N1/4092
摘要： The invention relates to a method and apparatus for electronic contrast valuation of two-dimensional transparent original images, in which the original images are electro-optically scanned by rows and columns. The image signals, corresponding to the image elements or pixels, and possibly needing correction, are subjected to frequency filtering, in which they are modified by a low-pass filter. The resulting low-pass signals are summed with corresponding high-pass signals obtained by subtraction of low-pass signals from the original image signals. The amplification factor for the high-pass signal is determined according to a non-linear transfer characteristic function K2, such that small signals corresponding to low image contrast are more greatly amplified (amplification S.sub.1) than are large signals corresponding to high image contrast (amplification S.sub.2), and that the low-pass signals are modified according to a non-linear gradation characteristic function K1 prior to the addition of the high-pass and low-pass signals.
摘要翻译： 本发明涉及一种用于二维透明原始图像的电子对比度估值的方法和装置，其中原始图像被行和列电光扫描。 对应于图像元素或像素的可能需要校正的图像信号进行频率滤波，其中它们被低通滤波器修改。 所得到的低通信号与通过从原始图像信号中减去低通信号而获得的相应的高通信号相加。 根据非线性传递特性函数K2确定高通信号的放大系数，使得对应于低图像对比度的小信号比对应于高图像对比度的大信号（放大）更大幅度地放大（放大S1） S2），并且在添加高通和低通信号之前，根据非线性灰度特征函数K1修改低通信号。
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2.发明授权Method of electronically improving the sharpness and contrast of a colored image for copying 失效电子提高彩色图像复制的清晰度和对比度的方法
公开(公告)号：US4812903A
公开(公告)日：1989-03-14
申请号：US85942
申请日：1987-08-14
IPC分类号： H04N1/04 , G06T1/00 , H04N1/409 , H04N1/46 , H04N1/48 , H04N1/60 , H04N9/68 , G03F3/08 , H04N9/64
CPC分类号： H04N1/6027
摘要： A colored original to be reproduced is scanned point-by-point in each of the three primary colors. The resulting imaging signals are processed to generate a luminance signal and a pair of chrominance signals. The luminance signal is branched into a high-pass filter channel and a low-pass filter channel. The high-pass portion of the luminance signal is amplified in accordance with a sublinear characteristic function which causes signals of small amplitude to be amplified to a greater degree than signals of large amplitude. The low-pass portion of the luminance signal is modified per a non-linear characteristic gradation function. The thus-modified high-pass and low-pass portions of the luminance signal are added to yield an enhanced luminance signal. The enhanced luminance signal is divided by the original luminance signal and each of the chrominance signals is multiplied by the resulting quotient. This automatially compensates for the changes in color saturation which accompany changes in brightness. After the multiplication, the chrominance signals are amplified in accordance with a sublinear characteristic function which causes signals of small amplitude to be amplified to a greater degree than signals of large amplitude. This characteristic function further has a form such that no additional ampification takes place beyond a predetermined threshold limit.
摘要翻译： 要再现的彩色原稿逐点扫描三种基色中的每一种。 所得到的成像信号被处理以产生亮度信号和一对色度信号。 亮度信号被分支为高通滤波器通道和低通滤波器通道。 亮度信号的高通部分根据使小幅度信号被放大到比较大幅度的信号更大程度的子线性特征函数被放大。 根据非线性特征灰度函数修改亮度信号的低通部分。 增加亮度信号的这样修正的高通部分和低通部分以产生增强的亮度信号。 增强的亮度信号被原始亮度信号除以，并且每个色度信号乘以所得到的商。 这会自动补偿颜色饱和度随着亮度变化的变化。 在相乘之后，色度信号根据使得小幅度信号被放大到比较大振幅的信号更大程度的子线性特征函数被放大。 该特征功能还具有这样的形式，使得不超过预定阈值极限进行额外的放大。
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3.发明授权Method of and apparatus for copying originals in which an image to be printed is evaluated by observing a corresponding low-resolution video image 失效通过观察相应的低分辨率视频图像来评估要打印的图像的原稿的复印方法和装置
公开(公告)号：US4825296A
公开(公告)日：1989-04-25
申请号：US85941
申请日：1987-08-14
CPC分类号： H04N1/32491 , H04N1/0044 , H04N1/40 , H04N2201/3287
摘要： An original to be copied is electrooptically scanned point-by-point. The resulting imaging signals are stored in a first memory and then forwarded to a first image processing unit where the signals are electronically corrected to enhance the image of the original. The corrected signals are loaded into a second memory. A portion of the corrected signals is recalled from the second memory and sent to a third memory. This portion of the corrected signals is then transmitted to a second image processing unit and thereafter converted into a low-resolution video image which can be inspected to determine image quality. If image quality is satisfactory, the contents of the second memory are sent to an exposure unit which prints a high-resolution image of the original on copy material. Imaging signals for a second original are loaded into the first memory as the contents of the second memory are recalled for printing. The second processing unit functions to adjust the video image so that it closely corresponds to the printed image of the original.
摘要翻译： 要复制的原件将逐点电子扫描。 所得到的成像信号被存储在第一存储器中，然后被转发到第一图像处理单元，其中信号被电子校正以增强原件的图像。 校正的信号被加载到第二存储器中。 校正信号的一部分从第二存储器被调用并被发送到第三存储器。 然后将该部分的校正信号发送到第二图像处理单元，然后转换成可以被检查以确定图像质量的低分辨率视频图像。 如果图像质量令人满意，则将第二存储器的内容发送到在复印材料上打印原稿的高分辨率图像的曝光单元。 当第二个存储器的内容被调用以进行打印时，将第二个原件的成像信号加载到第一个存储器中。 第二处理单元用于调整视频图像，使其与原稿的打印图像紧密对应。
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公开(公告)号：US5233413A
公开(公告)日：1993-08-03
申请号：US639826
申请日：1991-01-09
申请人： Hermann Fuchsberger
发明人： Hermann Fuchsberger
CPC分类号： H04N1/6027
摘要： A colored original is scanned point-by-point and density values are generated for each point in the primary colors red, green and blue. The points are divided into groups and the density values for each primary color are averaged over the respective groups. The averaged density values for each group are transformed into a set of converted values including a luminance value as well as first and second chrominance values. The range spanned by the luminance values is divided into segments and each set is assigned to a respective segment. The sets are classified as color dominant or color nondominant by comparing the saturation value of each set with a threshold value. For each, segment the first and second chrominance values of the nondominant sets are respectively added to yield first and second sums. The first and second sums are shifted relative to the gray point to generate corrected first and second sums. Each pair of uncorrected first and second sums is converted into uncorrected red, green and blue density values whereas corrected density values are obtained from the corresponding pair of corrected first and second sums. For each primary color, the corresponding uncorrected and corrected density values define a point in a coordinate system of uncorrected density versus corrected density. By plotting the points from the various segments, a correction curve can be established for each primary color.
摘要翻译： 彩色原稿逐点扫描，并为原色红，绿和蓝色的每个点生成浓度值。 这些点被分成组，并且每个基色的浓度值在各个组之间被平均。 每组的平均密度值被变换成一组转换值，包括亮度值以及第一和第二色度值。 由亮度值跨越的范围被划分为段，并且每个集合被分配给相应的段。 通过将每组的饱和值与阈值进行比较，将这些集合分类为显色或彩色非优势。 对于每个，分别添加非优势组的第一和第二色度值，以产生第一和第二和。 第一和第二和相对于灰度点移动以产生校正的第一和第二和。 每对未校正的第一和第二和被转换成未校正的红色，绿色和蓝色浓度值，而从相应的一对校正的第一和第二和获得校正的密度值。 对于每种原色，相应的未校正和校正的密度值定义了未校正密度与校正密度的坐标系中的一个点。 通过绘制来自各个段的点，可以为每个基色建立校正曲线。
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公开(公告)号：US4831434A
公开(公告)日：1989-05-16
申请号：US085977
申请日：1987-08-14
申请人： Hermann Fuchsberger
发明人： Hermann Fuchsberger
CPC分类号： H04N1/6027
摘要： An improved method for correction of color saturation, in electronic image processing, automatically compensates for brightness changes resulting from contrast processing. The method is used with electronic image processing, in which a two-dimensional original image is electro-optically scanned along rows and columns for three primary colors, the resulting image signals are transformed into a luminance signal Y and two color-difference or chrominance signals C1, C2, and the luminance signal is modified by electronic contrast processing. The invention improves the basic image processing method by measuring the luminance signals Y.sub.1 and Y.sub.2 which occur, respectively, before and after contrast processing, and multiplying their quotient Y.sub.2 /Y.sub.1 by each of the two chrominance signals C1, C2. This compensates automatically for the increase in color saturation which accompanies a brightness reduction and for the decrease in color saturation which accompanies a brightness increase.
摘要翻译： 在电子图像处理中，用于校正色彩饱和度的改进方法自动补偿由对比度处理引起的亮度变化。 该方法与电子图像处理一起使用，其中二维原始图像沿着行和列三原色电光扫描，所得到的图像信号被变换为亮度信号Y和两个色差或色度信号 C1，C2，并且通过电子对比度处理修改亮度信号。 本发明通过测量在对比度处理之前和之后分别出现的亮度信号Y1和Y2，并将它们的商Y2 / Y1乘以两个色度信号C1，C2中的每一个来改进基本图像处理方法。 这自动补偿伴随着亮度降低的颜色饱和度的增加以及伴随着亮度增加的色饱和度的降低。
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6.发明授权Method and apparatus for adjusting color saturation in electronic image processing 失效用于调整电子图像处理中的色彩饱和度的方法和装置
公开(公告)号：US4812902A
公开(公告)日：1989-03-14
申请号：US85864
申请日：1987-08-14
申请人： Hermann Fuchsberger
发明人： Hermann Fuchsberger
CPC分类号： H04N1/6027 , H04N1/6058
摘要： A method for adjusting the color saturation during electronic image processing, in which a two-dimensional original image is electro-optically scanned along rows and columns for three primary colors and the resulting image signals are transformed into a luminance signal Y and two color-difference or chrominance signals C1, C2. A pre-selected adjustment of color saturation is used, in which, in accordance with a non-linear characteristic curve, small chrominance signals C1, C2 are more amplified than larger chrominance signals C1, C2 corresponding to a higher degree of saturation.
摘要翻译： 一种用于调整电子图像处理期间的色饱和度的方法，其中将二维原始图像沿着行和列三原色电光扫描，并将得到的图像信号变换为亮度信号Y和两个色差 或色度信号C1，C2。 使用预选的色彩饱和度调整，其中根据非线性特性曲线，较小的色度信号C1，C2比对应于较高饱和度的较大色度信号C1，C2被放大。
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7.发明授权Method and apparatus for automatic recognition of image and text or graphics areas on printed masters 失效用于自动识别印刷主机上的图像和文字或图形区域的方法和装置
公开(公告)号：US4504972A
公开(公告)日：1985-03-12
申请号：US342898
申请日：1982-01-26
CPC分类号： G06K9/00456
摘要： A method and apparatus for automatically recognizing the presence of an image area and a text or graphics area on a printed master which is being examined for determination of the textual content thereof employ an optoelectronic video scanner, the scanned values obtained therefrom being digitized and stored in a memory. The input master is schematically divided into small overlapping windows and a number of length of run histograms are generated by a computer for each such window. The particular characteristics of each of the histograms are examined for determination as to whether the histograms correspond to a text or graphics area or an image area of printed material on the master.
摘要翻译： 一种用于自动识别正在检查以确定其文本内容的印刷主机上的图像区域和文本或图形区域的存在的方法和装置采用光电子扫描仪，由此获得的扫描值被数字化并存储在 一个记忆 输入主机被示意性地划分成小的重叠窗口，并且计算机为每个这样的窗口生成多个运行直方图的长度。 检查每个直方图的特定特征以确定直方图是否对应于主文件上的文本或图形区域或打印材料的图像区域。
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8.发明授权Method and apparatus for automatic recognition of image and text/graphics areas on a master 失效用于在主机上自动识别图像和文本/图形区域的方法和装置
公开(公告)号：US4411015A
公开(公告)日：1983-10-18
申请号：US265107
申请日：1981-05-19
CPC分类号： G06K9/00456 , H04N1/40062
摘要： An apparatus and method for automatic recognition of image and text/graphics areas on a master undertake an opto-electronic scanning of the master with analog values obtained by the scanning being sampled and converted into digital information which is stored in a data field which is divided into a number of windows having edge lengths selected to be greater than the spacing between two successive lines of text. A grayscale value histogram is generated for each window and is statistically analyzed for determining whether the area of the master represented by the window is predominantly a text/graphics area or an image area based on known statistical characteristics generally related to each type of area.
摘要翻译： 用于在主机上自动识别图像和文本/图形区域的装置和方法进行对主机的光电扫描，其中模拟值通过被扫描的采样获得并被转换成数字信息，该数字信息被存储在分割的数据字段中 进入具有选择的边缘长度大于两条连续文本行之间的间距的多个窗口。 为每个窗口生成灰度值直方图，并进行统计分析，以确定由窗口所表示的主机的区域是否主要是文本/图形区域或基于与每种类型的区域通常相关的已知统计特性的图像区域。
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