Method and device for obtaining in real time the two-dimensional discrete cosine transform.

摘要

Especially applicable to the compression of video signals. The method, which makes use of the possibility of breaking down one two-dimensional transform into two one-dimensional transforms, is characterised in that the two one-dimensional transforms are computed in time-overlapped processes, the first of these generating data for the second and the second using the data previously supplied by the first. The device consists of two multiplier sections (6, 12) separated one from the other by two FIFO memories (9, 11) which act as temporary stores, and of the selection logic (10) required to allocate at each moment the read or write function to each FIFO memory.