公开(公告)号：US20060098243A1

公开(公告)日：2006-05-11

申请号：US10983825

申请日：2004-11-08

Applicant: Mohamed Ahmed ,  Tomasz Cholewo ,  Steven Weed

Inventor： Mohamed Ahmed ,  Tomasz Cholewo ,  Steven Weed

IPC: H04N1/04

CPC classification number: H04N1/00681 ,  H04N1/00689 ,  H04N1/0071 ,  H04N1/00713 ,  H04N1/00718 ,  H04N1/00721 ,  H04N1/00734 ,  H04N1/00737 ,  H04N1/00745 ,  H04N1/00774 ,  H04N1/00785

Abstract: One method for determining a gray background value of a scanned document having left, right, top and bottom edges includes obtaining a scanned image of a horizontal strip which includes at least one portion of the document and which includes at least one non-document area, and includes creating a histogram of pixel values, of the horizontal strip, inside the document edges while excluding from the histogram pixel values, of the horizontal strip, located outside the document edges. Another method for determining a gray background value includes obtaining a scanned image of a vertical strip. One method for determining skew of a scanned document includes obtaining a scanned image, which includes a leading document edge, using vertically-displaced successive horizontal scan lines, includes determining points of the leading edge, and includes fitting a line to the points. Another method for determining a skew uses horizontally-displaced successive vertical scan lines.

Abstract translation: 用于确定具有左，右，上和下边缘的扫描文档的灰色背景值的一种方法包括获得包括文档的至少一部分并且包括至少一个非文档区域的水平条带的扫描图像， 并且包括在文档边缘内部创建水平条带的像素值的直方图，同时排除位于文档边缘外部的水平条带的直方图像素值。 用于确定灰色背景值的另一种方法包括获得垂直条的扫描图像。 用于确定扫描文档的偏斜的一种方法包括使用垂直移位的连续水平扫描线获得包括前导文档边缘的扫描图像，包括确定前缘的点，并且包括将线拟合到点。 用于确定偏斜的另一种方法使用水平移位的连续垂直扫描线。