Is there a transformation filter to decode light signal through Glass Bricks?
In theory this is possible, in practice probably very hard, but I wouldn't say impossible. See a recent article by the Silberberg group for example, that demonstrates imaging through 'thin' turbid layers using scattered incoherent light. Also, search for works pioneered by A. P. Mosk on that matter (for example this one and this one). The main challenges are algorithm speed, or, by the time you'll find the correct transmission matrix, it'll change due to thermal fluctuations.