Effectual-Palm-RoI-Extraction

Python implementation of the Palmprint RoI extraction algorithm from An Effectual Method for Extraction of ROI of Palmprints

Algorithm

• Image is blurred and mask is extracted using Otsu Binarization.

• Centorid of mask is calcualted using moments M_10 and M_01 of the image.

• Edges are extracted by subtracting the erosion of the mask from itself. A 3x3 + shaped kernel is used for erosion.

• Outer boundary is detected using simple 8 connectivity.

• Find distance of points on the boundary from the centroid.

• Remove high frequency components from the function so that minimas due to unevenness of edge are removed

• Differentiate and find valley points from local minimas.

• Rotate the image to align valley points horizontally and crop the Region of Interest.

Requirements

Numpy
OpenCV
Matplotlib