EE4206/EE5806 Digital Image Processing : 2D Fourier Series for periodic signals with two independent variables.
A signal x(t1,t2) that satisfies the equation :
x(t1,t2) = x(t1 +T1, t2 +T2), for all t1, t2.
This signal is periodic with period T1 in the t1 direction and with period T2 in the t2 direction.
w1 = 2PI/T1 and w2 = 2PI/T2
Every Little Thing - Rescue me（日本語字幕）