A Mobile Computing Method Using CNN and SR for Signature Authentication with Contour Damage and Light Distortion

Table 1

Deduced golden G-L filtering algorithm for mending contour damage of signature image.

Input:	The original signature image .
Output:	The filtered image .
Step 1:	For each pixel of , calculate the global mean gray value and the variance according to (1) and (2), respectively.
Step 2:	Calculate the local mean gray value of the pixel according to (3).
Step 3:	Calculate the G-L mean gray value of the pixel according to (4).
Step 4:	Calculate the improved Gaussian template according to (5) and (6).
Step 5:	Add salt and pepper noise signature image and obtain the filtered image .
Step 6:	For each pixel, filter the noise signature image by the convolution operation using the improved Gaussian template , and obtain the filtered image .