start of the transposed reading of a block of images k during the first series of four elementary cycles t h to t 4h the following operations for access to the memory are performed in reading 0 then 4 8 12 corresponding to the transposed reading of the block of images k namely the reading of the matrix memory along the columns whereas the prior writing of the block k was made linewise in the memory in writing 12 then 13 14 15 namely the last line of the block of images k written from the source sequence feeding the memory during the series of four following elementary cycles the 34 line 34 data coming from the source sequence from the images block 34 k 1 34 are written in the 34 column 34 released by the reading of the first series of the transposed sequence of the block k namely and so on in accordance with the table of fig2 in examining the sequencing of the reading writing operations in detail it may be noted that a natural splitting of the memory into an odd parity half plane and an even parity half plane causes conflicts relating to access for example in t o a writing of the word 0 has to be done and simultaneously a writing of the word 12 which is of the same parity and is therefore physically located in the same storage half plane this anomaly is coped with by using the organization proposed in fig3 wherein the words of the odd parity lines of the matrix are permutated in.