| ANN | Artificial neural network |
| BP | Back projection |
| BPNN | Back propagation neural network |
| DA | Discriminant Analysis |
| FD | Fourier-descriptor |
| FDR | Fisher discrimination ratio |
| FNN | Feed forward neural network |
| FSCABC | Fitness-scaled chaotic artificial bee colony algorithm |
| LBP | Local binary pattern |
| MLR | Multiple linear regression |
| PCA | Principal component analysis |
| PNN | Probabilistic neural network |
| RBPNN | Radial basis probabilistic neural networks |
| SVM | Support vector machine |
| WLD | Weber local descriptor |