  The present paper deals with an application of the image normalization
technique for certain classes of Wiener-Hopf operators (WHOs) associated to
ill-posed boundary-transmission value problems. We briefly describe the method
of normalization and then apply it to boundary-transmission value problems
issued from diffraction problems for a junction of two half-planes, which are
relevant in mathematical physics applications. We consider different
boundary-transmission conditions on the junction of the two semi-infinite
half-planes and analyze the not normally solvability of the corresponding
operators.
