发明名称 Method and device for processing colour information of a pattern having cluttered and useful information characters
摘要 In a method for processing of color information of a document provided with noise characters and usable characters, a digital image of the document is generated comprised of image points. At least one image region of a first type is selected which is known to correspond to a region of the document that contains noise characters but no usable characters. A brightness value range based on brightness value ranges of image points of the image region of the first type is established. For saturation values of those image points of the image region of the first type whose brightness values lie in the established brightness value range, a frequency with which these saturation values occur in the image region of the first type is respectively determined. Based on these saturation values whose determined frequency exceeds a predetermined value, a saturation value range containing these saturation values is established. For color tone values of those image points of the image region of the first type whose brightness values lie in the established brightness value range, a frequency with which these color tone values occur in the image region of the first type is respectfully determined. Based on those color tone values whose determined frequency exceeds a predetermined value, a color tone value range containing these color tone values is established. The colors of those image points of the image region whose brightness values lie in the established brightness value range, whose saturation values lie in the established saturation value range, and whose color tone values lie in the established color tone value range are associated with a first color class of colors corresponding to the noise characters. The colors of those image points of the image region of the first type that are not associated with the first color class are associated with a second color class of colors corresponding to a character-less document. At least one image region of a second type is selected which is known to correspond to a region of the document that contains neither noise characters nor usable characters. The colors of those image points of the image region of the second type whose brightness values lie in the established brightness value range, whose saturation values lie in the established saturation value range, and whose color tone values lie in the established color tone value range are excluded from the first color class and are associated with the second color class.
申请公布号 US2006210149(A1) 申请公布日期 2006.09.21
申请号 US20040549063 申请日期 2004.03.10
申请人 HUND MARTIN 发明人 HUND MARTIN
分类号 G06K9/00;G06K9/18;G06K9/38 主分类号 G06K9/00
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