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摘要
A digital imaging method was developed to determine the size, weight, volume and density of individual barley grains. Calibrations were developed using morphological measurements based on 2-D digital images, and were validated using a range of bulk barley samples.
The validation of the grain diameter (minor) and grain weight algorithms gave high correlation coefficients (r = 0.93 and 0.97, respectively, P < 0.01), with low standard errors (0.09 mm and 1.37 mg, respectively) when compared to physical measurements.
Estimated grain volume and density from image data, using three different mathematical approaches were compared: Model 1, a general ellipsoid; Model 2, a combination of two cone frustums with an ellipse top and base; and Model 3, a set of elliptical cylinders representing pixels along the image length. Derived grain volume data using Model 2 when compared to gas displacement volume measurements gave significant correlations (r = 0.97, P < 0.01) with the lowest standard error (0.97 mm(3)), in contrast to volume data estimated using Model 1 and Model 3. Even though Model 2 gave accurate and precise results for grain volume, Model 1 (with the slope adjusted) gave the highest correlation (r = 0.63, P < 0.01) with the lowest standard error (0.055 mg/mm(3)) for estimating grain density from image data, compared to gas displacement density measurements.
- 出版日期2012-1
