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公开(公告)号：JP2003228707A
公开(公告)日：2003-08-15
申请号：JP2002302854
申请日：2002-10-17
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , BARBEYRAC DAMIEN
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
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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
Applicant: ST MICROELECTRONICS SA , TISSE CHRISTEL-LOIC
Inventor： TISSE CHRISTEL-LOIC
CPC classification number: G06K9/00604 , G06K9/00268 , G06K9/4633 , G06T7/66 , G06T7/70 , G06T2207/30041
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。
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Patent Agency Ranking
公开(公告)号：DE60307583T2
公开(公告)日：2007-10-04
申请号：DE60307583
申请日：2003-11-19
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , PLAZA LAURENT , PETITJEAN GUILLAUME
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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公开(公告)号：DE60223982T2
公开(公告)日：2008-12-04
申请号：DE60223982
申请日：2002-10-16
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , BARBEYRAC DAMIEN
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.
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公开(公告)号：DE60223982D1
公开(公告)日：2008-01-24
申请号：DE60223982
申请日：2002-10-16
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , BARBEYRAC DAMIEN
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.
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公开(公告)号：DE60311747D1
公开(公告)日：2007-03-29
申请号：DE60311747
申请日：2003-11-19
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , PLAZA LAURENT , PETITJEAN GUILLAUME
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
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公开(公告)号：DE60307583D1
公开(公告)日：2006-09-28
申请号：DE60307583
申请日：2003-11-19
Applicant: ST MICROELECTRONICS SA
Inventor： TISSE CHRISTEL-LOIC , PLAZA LAURENT , PETITJEAN GUILLAUME
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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