Use of image analysis to predict milling extraction rates of wheats

Image analysis of grain morphological characteristics was examined as a possible means of predicting extraction rates of a wide variety of wheat types. Two elevations of grain were examined and measured. For the top view whole grains were used, while for the lateral view grains were sagittally bisected in the plane of the crease. Extraction rate was assessed on laboratory mills and expressed as flour yield. Milling extraction rate correlated with one shape factor with a coefficient of 0.78. Inclusion of a second factor in a stepwise regression increased the correlation coefficient