Consumer Products

Wood Surface Inspection

Identify quality problems in final cut wood boards

Lumber planks being inspected on a rolling conveyor

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Modern sawmills or lumber mills are computer-controlled enterprises that process raw logs into millions of board feet of lumber per day. After initial cutting and trimming, wood is kiln or air dried, then planed and cut to final dimensions. Wood is precisely graded for quality. The number and location of defects, whether chips, cracks, or other flaws, in the final cut determine the lumber grade, and thus the final price that can be charged.

As a natural product, wood is more varied than artificial materials, making wood surface inspection challenging. It is impossible to program all possible defects and wood patterns, so conventional machine vision is of limited use for lumber grading visual inspection.

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Cognex Deep Learning is trained on images of various possible wood defects revealed by saw cuts. The classification tool then identifies and distinguishes various types of wood defects, while accepting the wide range of patterns, textures, and color variations.

Wood quality problems, whether a poor cut or poor quality of initial wood indicates a problem upstream in the supply chain. Cognex Deep Learning is sensitive enough to detect slight variations in the cut that indicate a possible problem with the saw blade. Instead of waiting for that saw’s quality to decline to the point that its cut is ragged enough to require a wood regrade, it can be adjusted or replaced long before there is any visible problem.

 

Vision system identifying defective wood planks

 

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