Biometric image processing method and electronic device thereof

An electronic device, comprising:

• a sensor configured to obtain a first biometric image;
• and
• a processor coupled to the sensor and configured to capture a plurality of grayscale values of a first portion of pixels of the first biometric image and combine the grayscale values of the first portion of pixels of the first biometric image to generate a first sub-image, wherein the first portion of pixels of the first biometric image are pixels of each even-number coordinate or each odd-number coordinate of the first biometric image,
• wherein the processor performs an image processing procedure on the first sub-image and replaces the grayscale values of the first portion of pixels of the first biometric image with a plurality of grayscale values of all of the pixels of the first sub-image after the image processing,
• wherein the processor performs a mask operation on a plurality of unreplaced grayscale values of other portions of pixels of the first biometric image to generate a second biometric image.