The effects of drying air temperature and sample thickness on color changes were dominated over the effect of drying air velocity. However, non-linear and somewhat complex trends were obtained for all color parameters as function of moisture content. The MLP ANN satisfactorily approximated the color and moisture variations of apple slices with correlation coefficient higher than 0.92. Therefore, the computer vision system supple mented with ANN can be used as a non-invasive, low cost, and easy method for fast and in-line assessing and controlling of food stuffs color and moisture changes during drying.
drying air velocity