公开(公告)号：US5351313A

公开(公告)日：1994-09-27

申请号：US806628

申请日：1991-12-13

申请人： Goroh Bessho ,  Michiyoshi Tachikawa

发明人： Goroh Bessho ,  Michiyoshi Tachikawa

IPC分类号： G06K9/38 ,  H04N1/403

CPC分类号： H04N1/403 ,  G06K9/38 ,  G06K2209/01

摘要： A binarization method obtains an optimum threshold value for binarization which is used when converting a multi-level image data which describes an input image into a black-and-white bi-level image data. The binarization method includes the steps of counting a first number of black picture elements by varying a threshold value from a darkest tone level to a lightest tone level, counting a second number of picture elements having a tone level other than the lightest tone level, obtaining a percentage of the first number with respect to the second number for each of the varied threshold values so as to normalize a density of the input image, and determining the optimum threshold value for binarization based on the percentage which is obtained for each of the varied threshold values.

摘要翻译： 二值化方法获得用于将描述输入图像的多级图像数据转换成黑白双层图像数据时使用的二值化的最优阈值。 二值化方法包括以下步骤：通过将最暗色调电平的阈值改变为最浅色调电平来对第一数量的黑色像素进行计数，对具有除最轻音级之外的音调电平的第二数量的像素进行计数，获得 相对于每个变化阈值的第二数量的第一数量的百分比，以便对输入图像的浓度进行归一化，并且基于为每个变化的阈值获得的百分比来确定用于二值化的最佳阈值。 阈值。

公开(公告)号：US5097520A

公开(公告)日：1992-03-17

申请号：US457933

申请日：1989-12-27

申请人： Goroh Bessho ,  Michiyoshi Tachikawa

发明人： Goroh Bessho ,  Michiyoshi Tachikawa

IPC分类号： G06K9/38 ,  H04N1/403

CPC分类号： H04N1/403 ,  G06K9/38 ,  G06K2209/01

摘要： A binarization method obtains an optimum threshold value for binarization which is used when converting a multi-level image data which describes an input image into a black-and-white bi-level image data. The binarization method includes the steps of counting a first number of black picture elements by varying a threshold value from a darkest tone level to a lightest tone level, counting a second number of picture elements having a tone level other than the lightest tone level, obtaining a percentage of the first number with respect to the second number for each of the varied threshold values so as to normalize a density of the input image, and determining the optimum threshold value for binarization based on the percentage which is obtained for each of the varied threshold values.

摘要翻译： 二值化方法获得用于将描述输入图像的多级图像数据转换成黑白双层图像数据时使用的二值化的最优阈值。 二值化方法包括以下步骤：通过将最暗色调电平的阈值改变为最浅色调电平来对第一数量的黑色像素进行计数，对具有除最轻音级之外的音调电平的第二数量的像素进行计数，获得 相对于每个变化阈值的第二数量的第一数量的百分比，以便对输入图像的浓度进行归一化，并且基于为每个变化的阈值获得的百分比来确定用于二值化的最佳阈值。 阈值。

公开(公告)号：US5075895A

公开(公告)日：1991-12-24

申请号：US501805

申请日：1990-03-30

申请人： Goroh Bessho

发明人： Goroh Bessho

IPC分类号： G06K9/00 ,  G06K9/20

CPC分类号： G06K9/00449

摘要： A method for recognizing a table area in a document, includes the steps of extracting image data on a table area having a table from binary image data on a document, extracting a line segment extending in a first direction from the image data on the table area, and extracting a line segment extending in a second direction perpendicular to the first direction from the image data on the table area. The method also includes the steps of determining, from the line segment extending in the first direction and the line segment extending in the second direction, whether or not ruled lines are provided on both sides of the table, and generating imaginary ruled lines on both sides of the table when it is determined that the ruled lines are provided on neither side of the table. An apparatus for recognizing a table area in a document is provided.

摘要翻译： 一种用于识别文档中的表格区域的方法包括以下步骤：从文档上的二值图像数据中提取具有表的表区域的图像数据，从表区域上的图像数据中提取沿第一方向延伸的线段 并且从表区域上的图像数据提取沿与第一方向垂直的第二方向延伸的线段。 该方法还包括以下步骤：从沿第一方向延伸的线段和沿第二方向延伸的线段确定是否在工作台的两侧设置划线，并且在两侧产生虚数划线 当确定在表的两侧都没有设置划线时。 提供了用于识别文档中的表格区域的装置。

公开(公告)号：US07453594B2

公开(公告)日：2008-11-18

申请号：US10190503

申请日：2002-07-09

申请人： Goroh Bessho

发明人： Goroh Bessho

IPC分类号： G06K15/00 ,  G06K15/02

CPC分类号： H04N1/64

摘要： An image memory stores image data of a document file. A bit map developing part converts the document file into bit map image data. A difference information extraction part compares the bit map image data with the image data so as to extract difference information representing a difference between the bit map image data and the image data. The difference information is saved as a deference information file.

摘要翻译： 图像存储器存储文档文件的图像数据。 位图开发部分将文档文件转换为位图图像数据。 差分信息提取部分将位图图像数据与图像数据进行比较，以提取表示位图图像数据和图像数据之间的差异的差异信息。 差异信息被保存为参考信息文件。

公开(公告)号：US5563403A

公开(公告)日：1996-10-08

申请号：US355902

申请日：1994-12-14

申请人： Goroh Bessho ,  Koichi Ejiri

发明人： Goroh Bessho ,  Koichi Ejiri

IPC分类号： G06K9/32 ,  G06T7/60 ,  H01J40/14

CPC分类号： G06K9/3283 ,  G06K2209/01

摘要： A method and apparatus for detecting the skew angle of a document image. Skew angle determination is performed by the steps of determining a set of sampling points from an input document image and processing X and Y coordinates of the sampling points in order to calculate a regression coefficient of the sampling points. The skew angle of the document is determined using the regression coefficient. To evaluate a calculated skew angle which corresponds to the regression coefficient, a correlation coefficient is calculated and evaluated. As coordinates of sampling points are obtained for a plurality of sets of data corresponding to different ruled lines or lines of characters, a histogram may be used to determine the most probable skew angle.

摘要翻译： 一种用于检测文档图像的歪斜角度的方法和装置。 通过从输入文档图像确定一组采样点并处理采样点的X和Y坐标以便计算采样点的回归系数的步骤来执行倾斜角确定。 使用回归系数确定文档的歪斜角度。 为了评估与回归系数对应的计算出的偏斜角，计算并评估相关系数。 由于针对对应于不同的格线或字符行的多组数据获得采样点的坐标，因此可以使用直方图来确定最可能的倾斜角。