公开(公告)号：US06941026B1

公开(公告)日：2005-09-06

申请号：US09592839

申请日：2000-06-13

申请人： Sateesh Gopalakrishna Nadabar ,  Ranjit Desai

发明人： Sateesh Gopalakrishna Nadabar ,  Ranjit Desai

IPC分类号： G06K7/14 ,  G06K9/40 ,  G06K9/56

CPC分类号： G06K7/1443 ,  G06K7/14

摘要： Visual information regarding intensity and intensity-based gradient information is used in a multi-step process for accurately locating and decoding an encoded visual symbol matrix. A symbol is preprocessed with filtering and morphology. A set of coarse locations of candidate symbols is filtered according to coarse geometric criteria to determine which image locations are most viable. Depending upon the symbol type, and information about the edges of the symbols, additional symbol-specific filtering and refinements can be applied or skipped. For 2D matrices filtering according to intensity variance criteria is followed by an edge-locating refinement and by identifying finder patterns and timing patterns. Once finder patterns and timing patterns are precisely located, the data region is decoded. Where a data region does not decode validly, another pass is run, using the non-morphed image, resulting in an overall saving of time, as rejections may require operator intervention.

摘要翻译： 关于基于强度和强度的梯度信息的视觉信息被用于准确地定位和解码编码的视觉符号矩阵的多步骤过程中。 符号被过滤和形态预处理。 根据粗略几何标准过滤一组候选符号的粗略位置，以确定哪些图像位置是最可行的。 根据符号类型和关于符号边缘的信息，可以应用或跳过附加的符号特定过滤和细化。 对于根据强度方差标准的2D矩阵滤波，其后跟边缘定位细化，并通过识别取景器图案和时序图案。 一旦查找器图案和定时模式被精确地定位，则对数据区进行解码。 在数据区域无法有效解码的情况下，使用未变形的图像运行另一遍，导致总体节省时间，因为拒绝可能需要操作员干预。