发明名称 |
Log evaluation using cylindrical projections |
摘要 |
A three-dimensional density distribution of a log is reduced to a two-dimensional structure that provides a convenient image or visualization of defects like knots or voids in a log, to facilitate grading and/or optimization of a sawing strategy for the log. The two-dimensional data structure is based on cylindrical or modified cylindrical coordinates Z and theta. To provide a more compact identification of defects, modified cylindrical coordinates use a Z-axis that follows the growth center in the log and determines data points by evaluating properties of the log along rays at an upward angle corresponding to limbs in a tree. A process for identifying the growth center at any distance Z along the length of the log examines or accumulates the gradient of density along lines through a cross-section of the log. Manual grading and sawing optimization can employ viewing of an image based on the two-dimensional data structure with superimposed marks indicating the boundaries of faces cut from the log. Automated grading and sawing optimization employs the two-dimensional data structure to reduce processing time when compared to processes that manipulate three-dimensional data structures.
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申请公布号 |
US6597761(B1) |
申请公布日期 |
2003.07.22 |
申请号 |
US20010792650 |
申请日期 |
2001.02.23 |
申请人 |
INVISION TECHNOLOGIES, INC. |
发明人 |
GARMS, III WALTER I. |
分类号 |
B27B1/00;G01N21/47;(IPC1-7):G01N23/02 |
主分类号 |
B27B1/00 |
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