发明名称 |
BINARY QUANTIFICATION OF AN IMAGE HAVING MULTIPLE LEVELS OF GREYS |
摘要 |
Method for transforming a video type image having multiple levels of greys into a binary image, method wherein each pixel is either white or black. With each pixel of the initial image there is associated a partial image centered on said pixel and comprising a plurality of pixels in at least one dimension. If the histogram of the grey levels of said partial image is considered as bimodal (D > E), a threshold (S) median with respect to said histogram is selected. If the histogram is considered as monomodal (D < e), a threshold (S) outside said histogram is selected, the position of this threshold with respect to the histogram being determined by comparison of the latter with a preset mean background value (FM). Application to telecopy, electronic storage of documents and drawings, preprocessing in order to facilitate the reading of handwritten messages or recognition of patterns in general. |
申请公布号 |
WO8802587(A1) |
申请公布日期 |
1988.04.07 |
申请号 |
WO1987FR00368 |
申请日期 |
1987.09.28 |
申请人 |
BERTIN & CIE |
发明人 |
FARDEAU, MICHEL, GUSTAVE, JULES;ADAMOLLE, BRUNO, JEAN, MARIE |
分类号 |
G06T1/00;H04N1/40;H04N1/403;(IPC1-7):H04N1/40 |
主分类号 |
G06T1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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