设函数\(f\left ( {x} \right )=\sin {\left ( {ωx+\frac {\pi } {4}} \right )}+b\left ( {ω>0} \right )\)的最小正周期为T,若\(\frac {2\pi } {3}<T<\pi \),且函数\(y=f\left ( {x} \right )\)的图像关于点\(\left ( {\frac {3\pi } {2},2} \right )\)中心对称,将\(y=f\left ( {x} \right )\)的图像向左平移\(φ\left ( {φ>0} \right )\)个单位后关于\(y\)轴对称,则\(φ\)的最小值为( )