I/Q mismatch in receiver.

In low-IF, I/Q mismatch causes the degradation of the image rejection. Since the adjacent channel is the image frequency in low-if receiver if 1/2 bandwidth is choosen as low-if frequency, if I/Q mismatch(SSB, gain/phase imbalance in quadrature mixer) is -30dB and the adjacent channel is +30dB higher than the desired channel, then
the leakage into the desired channel due to image will be the same as the power of the desired in desired channel. How to remove the co-channel interference caused by image? It's said that some digital algorithm can do that such as adaptive inerference cancellation,.... Could somebody give some hints or helps.