Research method of sawn timber surface defects based on structured laser scanning technology

Abstract

The invention discloses a structure laser scanning technology based study method for surface defect of a converted timber. The method comprises the following steps: acquiring 3D structure information of the converted timber; measuring the property parameters of the converted timber; calculating arithmetic average deviation of absolute value of the distance from each point on the profile of the surface, to be measured, of the converted timber, to a center line within the measuring length L range of the surface, to be measured, of the converted timber; acquiring a converted timber image within the measuring length range; determining the surface knurr appearance quality influence coefficient h, the crack position influence coefficient k, the crack length influence coefficient p and the maximum mean square deviation according to the parameters in the converted timber image; creating converted timber appearance quality comprehensive quantization evaluation value Q according to the knurr appearance quality evaluation value Qk, the crack appearance quality evaluation value Qc and the color difference appearance quality evaluation value Qd; and dividing Q into four grades. According to the method, the surface defect of the converted timber can be quickly detected on the basis of detected surface roughness of the converted timber, thus increasing the converted timber surface detecting efficiency as well as improving the detection effect.

Description

technical field [0001] The invention relates to the technical field of wood processing in the agriculture and forestry industry, in particular to a research method for surface defects of sawn timber based on structural laser scanning technology. Background technique [0002] The board has multiple appearance features, especially surface material defects, processing defects, color difference and texture, which are the main factors that determine the appearance quality. National standard GB / T5849-2006 (blockboard) GB / T9846-2004 (Part 4: technical conditions for ordinary plywood appearance classification), GB / T13010-2006 (sliced ​​veneer), GB / T17656-2008 (concrete Plywood for formwork), GB / T19536-2004 (plywood for container floor), GB / T20241-2006 (laminated veneer lumber), etc., and forestry industry standard LY / T1654-2006 (recombined decorative veneer), LY / T1655 -2006 (recombined decorative materials), LY / T1599-2011 (rotary cut veneer), LY / T1738-2008 (plywood for solid wood c...

AI Technical Summary

Problems solved by technology

However, the method lacks objectivity and is unquantifiable because it depends largely on the empirical knowledge of a particular expert; at the same time, it is difficult to make an accurate evaluation if too many factors are considered, especially some Due to the characteristics of repetition and singleness, it is difficult to meet the requirements of online production in the production process; moreover, with the continuous increase of labor wages, labor costs continue to rise, which has become an expenditure that cannot be ignored by related enterprises

Images