Intra-patient Prone to Supine Colon Registration for Synchronized Virtual Colonoscopy
MICCAI '02 Proceedings of the 5th International Conference on Medical Image Computing and Computer-Assisted Intervention-Part II
Grey Weighted Polar Distance Transform for Outlining Circular and Approximately Circular Objects
ICIAP '07 Proceedings of the 14th International Conference on Image Analysis and Processing
Estimation of pith position in untreated log ends in sawmill environments
Computers and Electronics in Agriculture
An Automatic Method for Counting Annual Rings in Noisy Sawmill Images
ICIAP '09 Proceedings of the 15th International Conference on Image Analysis and Processing
PSIVT'07 Proceedings of the 2nd Pacific Rim conference on Advances in image and video technology
Computers and Electronics in Agriculture
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Abstract: The quality of wood can be analyzed using annual ring width. At Swedish sawmills, this is performed using manual inspection for grading purpose. Here a completely automatic method for counting the number of annual rings on log end faces is described and evaluated. The method is applied and tested using images from Pinus sylvestris end faces acquired in online sawmill production with a camera mounted above a conveyor belt. Completely untreated end faces were captured, as well as newly sawn ones. The proposed method includes preprocessing, pith detection and counting the number of rings in two regions of the end face. A new method to remove marks from uneven sawing is presented as a part of the preprocessing steps. The evaluation shows that the suggested automatic method performs as well as the manual measurements that are the method used for measuring today.