Bilinear interpolation of an image or matrix

This function performs bilinear interpolation for a given image or matrix at any location

This function uses biLinear interpolation and looks at 4 pixels around the target location with ceil convention.
--RGB = 1 for gray scale images.
--img can be a single layer matrix or a RGB layer colored image
--yx =[y_value, x_value]; It can be either horizontal or vertical vector
--zpad is a boolean variable. if true, zeros are used for pixel values outside of the given img. If false, the nearest edge value is repeated.
Example:
[m,n]=meshgrid(1:3);img=[m+n]
--> 2 3 4
3 4 5
4 5 6
interpImg(img,[2.4,2.2])
--> 4.6
Disi A
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