On-line lumber quality control technique using image processing Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5712m929z

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  • Product quality control is the back bone for an efficient process control system. By monitoring the size of the board cut in a sawmill, performance of the production system can be controlled. Feedback from the quality control system is used to evaluate the status of the production system and also used for preventive maintenance of the system. The software technique developed in this thesis involves three parts: image acquisition and analysis, quality control analysis, and power consumption analysis. An image of the boards is acquired, and board edges are identified and analyzed to compute the board widths. The effects of defects present on the board surface on the computation of board width are studied. The effect of camera distance from the surface of the object is also analyzed. Computed widths were compared with values measured with a caliper. The quality control program reads the computed board widths and then checks the measurements against control limits. The program also computes board averages and standard deviations and checks the averages against control limits. Between board deviations within cants and between saw pockets are also computed. The n board averages are displayed to check the process status. A power meter is used to monitor the power consumption of the production system. A program was developed to read the power meter and to display the data in a control chart or in tabular form as a means of checking the power consumption of the system.
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