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1.发明授权公开(公告)号：US10223587B2
公开(公告)日：2019-03-05
申请号：US15502169
申请日：2016-06-15
申请人： Solystic
发明人： Olivier Desprez
摘要： A method of processing articles, in particular postal articles, which method consists in forming a first digital image of an article and in deriving from said first image a first image signature that is a unique identifier for said article, in forming a current digital image again for said article, and in deriving from the current image a current signature that is compared with first article image signatures that are recorded in a memory, for the purpose of pairing-off the image signatures on the basis of similarity. The method is characterized in that each signature is derived using the following steps: extracting a digital map of the luminance gradient field of said image by local planar regression; identifying in said digital map points of interest corresponding to topological singularities of the gradient field having high local circular convergence or high local circular divergence.
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公开(公告)号：US11640702B2
公开(公告)日：2023-05-02
申请号：US16652799
申请日：2019-12-19
申请人： SOLYSTIC
发明人： Olivier Desprez
IPC分类号： G06V10/25 , G06V30/424 , H04L9/06 , G06T7/33
摘要： The method of matching digital images of the same article in a data processor unit comprises the steps of: transforming each digital image of an article into a local divergence topographic map of the luminance gradient vector field; detecting singularities or extrema of local divergence in the luminance gradient vector field, such singularities corresponding to points of interest in said digital image; and, for each detected point of interest, encoding the values for the singularity of the gradient field that are located on a plurality of concentric rings centered on the point of interest so as to derive a digital data vector (210); and transforming said vector into a digital hash key (220) by means of a family of hash functions of the cosine Locality-Sensitive Hashing (LSH) type.
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