Feature types | Symbols | Descriptions |
---|---|---|
Color | f1~2 | Mean and standard deviation value of candidate patch in RGB color |
f3~4 | Mean and standard deviation value of candidate patch in HSV color | |
f5~6 | Mean and standard deviation value of candidate patch in CIElab color | |
Grayscale | f7~8 | Mean and standard deviation value of candidate patch in \(I_\text {g}\) |
f9~10 | Mean and standard deviation value of candidate patch in \(I_\text {CLAHE}\) | |
DLC | f11~22 | Directional local contrast (DLC) of the center point of each candidate region in \(I_\text {CLAHE}\) |
Shape | f23~28 | Area, Perimeter, Circularity, Eccentricity, Aspect ratio, and Solidity of each candidate region |
Texture | f29~32 | Entropy, Energy, Homogeneity and Skewness of candidate patch in \(I_\text {CLAHE}\) |
Gaussian filter-based | f33~40 | Mean and standard deviation value of candidate patch in corresponding Gaussian filtered result of \(I_\text {CLAHE}\) when \(\sigma\) is \(\left[ 1,2,4,8\right]\) |
Gradient | f41~42 | Mean gradient of candidate patch in \(I_\text {CLAHE}\) (mean value of dx and dy) |
f43~44 | Mean gradient on the boundary of each candidate region in \(I_\text {CLAHE}\) (mean value of dx and dy on the boundary) |