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    • 1. 发明授权
    • Method and apparatus for logically tagging of document elements in the
column by major white region pattern matching
    • 用于通过主要白色区域模式匹配在列中逻辑地标记文档元素的方法和装置
    • US5699453A
    • 1997-12-16
    • US473909
    • 1995-06-07
    • Masaharu Ozaki
    • Masaharu Ozaki
    • G06K9/20G06K9/34
    • G06K9/00463G06K9/00469
    • A system for logically identifying document elements from a document includes an input port for inputting a signal representing the document image, a computer having a document structural model, a document white region extraction system that extracts major white regions separating and within document elements in the input document image, a major white region selecting device and a column string selection device that generate matching column string of document elements that match the extracted major white regions in a column, a column expression comparison device that selects the best matching column string and a logical tagging device that logically tags and then extracts the document elements in the document image using the best matching column string. The method for logically identifying document elements includes providing at least one structural model of a corresponding source document, each structural model including at least one column expression defining relationships between document elements of the source document. Identifying major white regions in the input document image segmenting and defining the document elements of the document image, and assembling a major white region pattern and generating at least one column string that matches the major white region pattern for each column of the input document. Then, determining the column string that most closely matches the column expression, and logically identifying each document element of the document image based on the closest matching column string.
    • 用于从文档逻辑地识别文档元素的系统包括用于输入表示文档图像的信号的输入端口,具有文档结构模型的计算机,提取主要白色区域的文档白色区域提取系统,以及输入的文档元素内的文档元素 文档图像,主白色区域选择装置和列字符串选择装置,其生成与列中提取的主白色区域相匹配的文档元素的匹配列串;列表达式比较装置,其选择最佳匹配列字符串和逻辑标记 设备使用最佳匹配的列字符串进行逻辑标记,然后提取文档图像中的文档元素。 用于逻辑地识别文档元素的方法包括提供对应的源文档的至少一个结构模型,每个结构模型包括定义源文档的文档元素之间的关系的至少一个列表达式。 识别输入文档图像中的主要白色区域,分割和定义文档图像的文档元素,以及组合主要白色区域图案,并生成与输入文档的每列相匹配的主要白色区域图案的至少一个列字符串。 然后,确定与列表达式最接近匹配的列字符串,并且基于最接近的匹配列字符串逻辑地标识文档图像的每个文档元素。
    • 8. 发明授权
    • Pulse frequency modulated DC-DC converter
    • 脉冲调制DC-DC转换器
    • US5801518A
    • 1998-09-01
    • US608484
    • 1996-02-28
    • Masaharu OzakiTakeshi NakaHitoshi Furutachi
    • Masaharu OzakiTakeshi NakaHitoshi Furutachi
    • H02M3/156G05F1/575
    • H02M3/156
    • A pulse frequency modulation type DC-DC converter has first and second voltage level comparators for controlling the frequency of a control signal used to drive an output coil. The first voltage comparator detects a first voltage level and the second voltage comparator detects a second voltage level. A reference voltage circuit produces reference voltages corresponding to the first and second voltage levels and provides the reference voltages to the first and second voltage comparators, respectively. An oscillating circuit generates the control signal under control of the first and second comparators. The control signal has one of a first pulse width and a second pulse width depending upon outputs of the first and second voltage comparators for controlling a switching device used for driving an output coil. The switching device is turned on to drive the output coil during a first pulse width when the first voltage comparator detects that the output voltage coincides with the first voltage level. The switching device is turned on to drive the output coil during a second pulse width when the second voltage comparator detects that the output voltage coincides with the second voltage level. Thus, outputs from the first and second voltage comparators determine the frequency of the control signal by controlling the pulse width of respective pulses of the control signal.
    • 脉冲频率调制型DC-DC转换器具有用于控制用于驱动输出线圈的控制信号的频率的第一和第二电压电平比较器。 第一电压比较器检测第一电压电平,第二电压比较器检测第二电压电平。 参考电压电路产生对应于第一和第二电压电平的参考电压,并将参考电压分别提供给第一和第二电压比较器。 振荡电路在第一和第二比较器的控制下产生控制信号。 根据用于控制用于驱动输出线圈的开关装置的第一和第二电压比较器的输出,控制信号具有第一脉冲宽度和第二脉冲宽度中的一个。 当第一电压比较器检测到输出电压与第一电压电平一致时,开关装置导通以在第一脉冲宽度期间驱动输出线圈。 当第二电压比较器检测到输出电压与第二电压电平一致时,开关装置导通以在第二脉冲宽度期间驱动输出线圈。 因此,来自第一和第二电压比较器的输出通过控制控制信号的各个脉冲的脉冲宽度来确定控制信号的频率。
    • 9. 发明授权
    • Method and apparatus for document element classification by analysis of
major white region geometry
    • 通过分析主要白色区域几何的文档元素分类的方法和装置
    • US5574802A
    • 1996-11-12
    • US315857
    • 1994-09-30
    • Masaharu Ozaki
    • Masaharu Ozaki
    • G06K9/20G06K9/34
    • G06K9/00463G06K9/00469
    • A system for logically identifying document elements in a document image using structural models includes assistant function for users to describe the structural models, a geometric relationship comparator for comparing geometric relationships in a document to the geometric relationships in a structural model, a matching system for determining which structural model matches the document image, and a logical tag assigning system for assigning logical tags to the document elements of the document image based on the matching structural model. The method for logically identifying the document elements in the document image using structural models comprises identifying the major white regions in the document image, using geometric relationships between the major white regions in the document image, identifying a structural model which matches the document image, and assigning logical tags to the document elements in the document image based on the matching structural model.
    • 用于使用结构模型逻辑地识别文档图像中的文档元素的系统包括用于用户描述结构模型的辅助功能,用于将文档中的几何关系与结构模型中的几何关系进行比较的几何关系比较器,用于确定的匹配系统 该结构模型与文档图像相匹配,以及逻辑标签分配系统,用于基于匹配结构模型将逻辑标签分配给文档图像的文档元素。 使用结构模型逻辑地识别文档图像中的文档元素的方法包括使用文档图像中的主要白色区域之间的几何关系来识别文档图像中的主要白色区域,识别与文档图像匹配的结构模型,以及 基于匹配的结构模型,将文档图像中的文档元素分配给逻辑标签。
    • 10. 发明授权
    • Method and apparatus for document segmentation by background analysis
    • 通过背景分析进行文档分割的方法和装置
    • US5555556A
    • 1996-09-10
    • US315875
    • 1994-09-30
    • Masaharu Ozaki
    • Masaharu Ozaki
    • G06K9/20G06K9/34
    • G06K9/00463G06K9/00469
    • A system for extracting document elements from a document using major white regions includes an input port for inputting a signal representing the document image, a connected component generator for generating connected components from the document image, a bounding box generator for generating a bounding box around each connected component, a major white region extractor for extracting major white regions from the document image, and a document element extractor for extracting the document elements from the document image. The method for extracting document elements comprises identifying primitive white areas laying between the bounding boxes, grouping the primitive white areas into groups, identifying the primitive white areas and groups which are major white regions, identifying closed loops of major white regions, segmenting the major white regions, locating closed loops of the segments, and identifying each portion of the document image enclosed by one of the closed loops of document segments as a document element.
    • 用于使用主要白色区域从文档中提取文档元素的系统包括用于输入表示文档图像的信号的输入端口,用于从文档图像生成连接的分量的连接分量生成器,用于生成围绕每一个的边界框的边界框生成器 连接组件,用于从文档图像中提取主要白色区域的主要白色区域提取器,以及用于从文档图像中提取文档元素的文档元素提取器。 用于提取文档元素的方法包括识别放置在边界框之间的原始白色区域,将原始白色区域分组成组,识别原始白色区域和主要白色区域的组,识别主要白色区域的闭环,分割主要白色 区域,定位段的闭环,以及将文档段中的一个闭环循环的文档图像的每个部分标识为文档元素。