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    • 8. 发明授权
    • Method for image skew detection
    • 图像偏斜检测方法
    • US08160393B2
    • 2012-04-17
    • US12559755
    • 2009-09-15
    • Chris W. HonsingerPaul W. Jones
    • Chris W. HonsingerPaul W. Jones
    • G06K9/36
    • G06K9/3275
    • A method for calculating a skew angle of an original image, executed at least in part on a computer system stores image data for the original image in an electronic memory, then forms an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data. A partitioned image is formed by partitioning the energy-normalized image into a number of sub-regions. A summed region is formed as a combination of image pixel data from the sub-regions. A Fourier magnitude spectrum is obtained by performing a Fourier transform on the summed region. The skew angle is calculated according to the peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles. An output signal indicates the calculated skew angle.
    • 用于计算至少部分地在计算机系统上执行的原始图像的偏斜角的方法将原始图像的图像数据存储在电子存储器中,然后根据图像特征的相对对比度幅度形成能量标准化图像 所存储的图像数据内的多个局部图像区域中的每一个。 通过将能量标准化图像分割成多个子区域来形成分割图像。 求和区域形成为来自子区域的图像像素数据的组合。 通过在求和区域上执行傅里叶变换来获得傅里叶幅度谱。 根据通过沿着恒定径向角度的多条线中的每一条积分傅立叶幅度谱形成的径向线积分函数的峰值来计算偏斜角。 输出信号表示计算出的偏斜角。
    • 10. 发明申请
    • Method for Image Skew Detection
    • 图像歪斜检测方法
    • US20100067826A1
    • 2010-03-18
    • US12559755
    • 2009-09-15
    • Chris W. HonsingerPaul W. Jones
    • Chris W. HonsingerPaul W. Jones
    • G06K9/36
    • G06K9/3275
    • A method for calculating a skew angle of an original image, executed at least in part on a computer system stores image data for the original image in an electronic memory, then forms an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data. A partitioned image is formed by partitioning the energy-normalized image into a number of sub-regions. A summed region is formed as a combination of image pixel data from the sub-regions. A Fourier magnitude spectrum is obtained by performing a Fourier transform on the summed region. The skew angle is calculated according to the peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles. An output signal indicates the calculated skew angle.
    • 用于计算至少部分地在计算机系统上执行的原始图像的偏斜角的方法将原始图像的图像数据存储在电子存储器中,然后根据图像特征的相对对比度幅度形成能量标准化图像 所存储的图像数据内的多个局部图像区域中的每一个。 通过将能量标准化图像分割成多个子区域来形成分割图像。 求和区域形成为来自子区域的图像像素数据的组合。 通过在求和区域上执行傅里叶变换来获得傅里叶幅度谱。 根据通过沿着恒定径向角度的多条线中的每一条积分傅立叶幅度谱形成的径向线积分函数的峰值来计算偏斜角。 输出信号表示计算出的偏斜角。