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MATCHING PICTURES OF POSTAL ARTICLES WITH DESCRIPTORS OF SINGULARITES FROM THE GRADIENT FIELD
MATCHING PICTURES OF POSTAL ARTICLES WITH DESCRIPTORS OF SINGULARITES FROM THE GRADIENT FIELD
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机译:带有梯度场的单义字符描述的邮政商品匹配图
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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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