Method | Description |
Color based techniques | Considering only pixel values. Color features based on different color spaces (RGB, HSI/HSV), histograms. |
Texture based techniques | Considering spatial relations between pixels. Co-occurrence matrices, homogenous texture descriptors. |
Contour based techniques | Focusing on edge, contour and boundary detection. |
Segmentation | Dividing images into meaningful regions based on criteria. |
Combination of various techniques | 1) Thresholding methods—Classifiers. 2) Pre-processing/post processing images. Dark regions removed. Over illuminated regions removed. Eliminate small detections. Color histogram adaptations Divide picture into smaller parts. |