**Step 3: (LBP Computation)**

**3.1.** Consider the top-level {LL, LH, HL} sub-bands and divide each subband into non-overlapping regions Rk with each of size 8 � 8 pixels.

**for** each sub-band **do**

**for** each sub-block within the sub-band **do**

**for** each coefficient value within the sub-block **do**


end for end for end for

**3.4.** Concatenate all the sub-band histogram features to form the final enhanced histogram feature vector *EFV*.
