CODING OF CONCENTRIC INFORMATION
    1.
    发明专利

    公开(公告)号:JP2003228707A

    公开(公告)日:2003-08-15

    申请号:JP2002302854

    申请日:2002-10-17

    Abstract: PROBLEM TO BE SOLVED: To provide a method for coding in frequency, module and phase a digital representation, in the space field, of a ring-shaped element. SOLUTION: The method includes the steps of applying to any point of the element a polar conversion at constant angle, whereby the element is unfolded in rectangular shape; transferring, to the frequency field, any point of the converted rectangular shape by means of a Fourier transform; filtering the discrete data resulting from the transfer by means of at least one real, bidimensional, band-pass filter, oriented along the phase axis; applying a Hilbert transform to the filtering results; applying an inverse Fourier transform to the results of the Hilbert transform; and extracting phase and module information in the space field. COPYRIGHT: (C)2003,JPO

    RING LOCATION
    2.
    发明申请
    RING LOCATION 审中-公开
    环位置

    公开(公告)号:WO03025841B1

    公开(公告)日:2003-10-09

    申请号:PCT/FR0203136

    申请日:2002-09-13

    Abstract: The invention concerns a method for locating, in a digital image, a circle centre, comprising the following steps: a) predefining a set of potential radii of the circle; b) dimensioning (303) two accumulators to a dimension in the form of a column matrix not larger than the size of the image in x-axis and a line matrix not larger than the size of the image in y-axis; c) sequentially, for each pixel of the image: (i) selecting successively each potential radius; (ii) evaluating the position of the potential centre of a circle of the selected radius and whereof the pixel concerned is on the periphery; and (iii) incrementing said accumulators at the x-axis and the y-axis of the potential centre; and d) selecting (304), as coordinates of the located centre, the x-axis and the y-axis corresponding to the maximum of accumulators.

    Abstract translation: 本发明涉及一种用于在数字图像中定位圆心的方法,包括以下步骤:a)预定义一组圆的潜在半径; b)将两个累加器的尺寸(303)设为不大于x轴中的图像尺寸的列矩阵形式的尺寸和不大于y轴中图像尺寸的线矩阵; c)顺序地,对于图像的每个像素:(i)连续地选择每个电位半径; (ii)评估所选半径的圆的潜在中心的位置,并且其相关像素在其周边上; 和(iii)在电位中心的x轴和y轴处增加所述累加器; 以及d)选择(304)作为定位中心的坐标,与累加器的最大值相对应的x轴和y轴。

    3.
    发明专利
    未知

    公开(公告)号:DE60307583T2

    公开(公告)日:2007-10-04

    申请号:DE60307583

    申请日:2003-11-19

    Abstract: The method involves approximately localizing a pupil in an image. An examination window centered at a position is defined from the approximate position of the pupil. A gradient accumulation operation is applied to the luminance values of the pixels of the examination window. A running total is proportional to a definition score of the image. An Independent claim is also included for a digital image processing system.

    4.
    发明专利
    未知

    公开(公告)号:DE60223982T2

    公开(公告)日:2008-12-04

    申请号:DE60223982

    申请日:2002-10-16

    Abstract: Method for frequency, modulation and phase coding of a digital representation of an annular element has the following steps: application (301) of a polar conversion with a constant angle for folding the element into a rectangular shape; transfer into the frequency domain unit a Fourier transform; band-pass filtering of the resultant data; application of a Hilbert transform; application of an inverse Fourier transform; and extraction of phase and modulation data in the spatial domain.

    5.
    发明专利
    未知

    公开(公告)号:DE60223982D1

    公开(公告)日:2008-01-24

    申请号:DE60223982

    申请日:2002-10-16

    Abstract: Method for frequency, modulation and phase coding of a digital representation of an annular element has the following steps: application (301) of a polar conversion with a constant angle for folding the element into a rectangular shape; transfer into the frequency domain unit a Fourier transform; band-pass filtering of the resultant data; application of a Hilbert transform; application of an inverse Fourier transform; and extraction of phase and modulation data in the spatial domain.

    6.
    发明专利
    未知

    公开(公告)号:DE60311747D1

    公开(公告)日:2007-03-29

    申请号:DE60311747

    申请日:2003-11-19

    Abstract: The method involves cumulating quadratic norms of horizontal and vertical gradients of luminance values of pixels to determine a cumulated total. The pixels are chosen according to a comparison of maximum luminance threshold to adjacent pixels in a concerned direction. The score is obtained by dividing the cumulated total by the number of cumulated quadratic norms. An Independent claim is also included for a system for determining the definition of a digital image

    7.
    发明专利
    未知

    公开(公告)号:DE60307583D1

    公开(公告)日:2006-09-28

    申请号:DE60307583

    申请日:2003-11-19

    Abstract: The method involves approximately localizing a pupil in an image. An examination window centered at a position is defined from the approximate position of the pupil. A gradient accumulation operation is applied to the luminance values of the pixels of the examination window. A running total is proportional to a definition score of the image. An Independent claim is also included for a digital image processing system.

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