A processing system for effecting angular displacement of at least part of a television picture. The picture is subdivided into picture areas each containing a plurality of picture points and a number of storage devices respectively receive information on each picture point within the area at a designated storage location. On read out, the location of a particular area is accessed by means of a picture point and line counter in a single read operation. Information on particular picture points within the area is selectively made available for interpolation via latches to allow construction of the displaced picture. The area accessed for read out can be modified relative to writing into the store in order to cope with any selected degree of displacement.