| 摘要 |
Procedure for determining the properties of a log (5), in which procedure a moving log is radiographed by means of more than one X-radiation source (4) and the radiographic information is received by means of detectors (9) measuring X-radiation. According to the invention, the stemwood and knots of the log are calculated by a principle based on a knowledge of the geometry and density of stemwood and knots. After the measurement, the effect of stemwood in the radiographic projections is eliminated by filtering and the knot mass is projected from the radiographic projections to volumetric elements (6) in a system of cylindric coordinates and, from the value of each volumetric element, an evidence value representative of the presence of a knot in the element is derived. The evidence values of mutually associated elements are combined, thus producing an evidence value for the aggregate to permit the knots to be located.
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