can any one of you please tell me how to implement these equations in matlab?

Answer 1

[Walter Roberson]

G = @(m,n,x,y) I(x,y) * g(m,n,x,y);

Answer 2

[Bjorn Gustavsson]

That's a convolution, so take a good look at the help for conv2:

help conv2

Then to get a Gabor-filtered image simply search for gabor filter implementations on the file exchange, I recall seeing a fair number of implementations there.

HTH.