The relationship between the visual evaluation of formation and the textural features of light transmitted images of sample sheets is discussed using 5 kinds of newsprint papers.
The two rank correlation coefficients associated with the relationship between the visual evaluation of floc and the textural feature f_e from the co-occurrence matrices were determined te be 1.0 (The matrices were calculated with images which were digitized with 1600μm and 3200μm detection spots).
The four rank correlation coefficients associated with the relationship between the visual evaluation of wire mark and the textural features f_i and f_i′ from the wevelength spectrum were determined to be 0.90 (The value of f_i was extrected from the wavelength range 200-3000μm, and the values of f_i′ were extracted from the wavelength ranges 200-2000μm, 200-3000μm, 200-4000um).
Thus, there is strong evidence that these two image analysis technique (i. e. the co-occurrence matrix and the wavelength spectra) may be correlated with the visual evaluation of floc and wire mark, respectively.