Co-occurrence matrix texture features of multi-spectral images on poultry carcasses

The variance, sum average, sum variance and sum entropy of co-occurrence matrix were the most significant texture features (probability, P < 0.0005) to identify unwholesome poultry carcasses at visible and near-infrared wavelengths. When a direction of co-occurrence matrix equals to 0<degrees>, the contrast value was lower and the inverse difference moment and difference variance were higher (probability, P < 0.01) than any other direction in the visible spectral images. The characteristics of variance and sum variance of spectral images varied with the wavelength of spectral images and unwholesomeness of poultry carcasses as well. The sum variance of wholesome was higher (probability, P < 0.005) than unwholesome carcasses at the wavelength of both 542 and 570 nm. For the near-infrared spectral images at 847 nm, the sum average, entropy and sum entropy values of unwholesome carcasses were higher (probability, P < 0.005) than wholesome ones. The linear discriminant model was able to identify unwholesome carcasses with classification accuracy of 95.6%, while the quadratic model (97.0% accuracy) was better to identify wholesome carcasses. (C) 2001 Silsoe Research Institute.