JP2825940B

PURPOSE:To attain block division even when number of horizontal picture elements is not equal to an integral number of multiple of horizontal picture element number of one block by providing a means forming a block through the collection of plural small blocks to the unit. CONSTITUTION:When a picture signal whose horizontal picture element number is not equal to an integral number of multiple of (m) is divided into a block (m picture elementsXn lines), other (j picture elementsXn lines) small block of the block is caused and plural small blocks are collected to form the block of (m picture elementsXn lines). For example, a color difference signal is converted into a digital signal at an A/D converter 2 by using a sampling frequency of 6.75MHz and a thinning-out circuit 102 is used to apply-thinning out then number of horizontal picture elements is 180. At block processing unit 103 has memories 105, 106, 107 for 8 lines the one memory is used for write and the remaining two memories are used for read among the three memories and the changeover of write/read is implemented in the unit of 8 lines. Thus, the entire pattern is divided into blocks of (8 picture elementsX8 lines).