ENCODING SYSTEM OF PICTURE HAVING GRADATION OF MULTILEVEL

PURPOSE:To encode a picture of a gradation of a multilevel with high compressibility, and to reproduce it successively by bringing an original picture signal having a gradation of a multilevel to a dual processing by a dither matrix, etc., and converting a binary code sequence obtained by said processing to a block. CONSTITUTION:An original picture signal having a gradation of a multilevel is brought to a dual processing by a dither matrix of (n)X(n), and the obtained binary code sequence is divided into picture elements of (n) pieces on each scanning line and conerted to blocks which take a value of 2, respectively. Also, at every once of all scanning lines of one picture, an operation which jumps over the scanning lines of the number depending on (n) of the matrix and encodes the block is repeated by a prescribed number of times, and the whole of one picture is encoded. Also, at the time of encoding of each time, with regard to a sporadical scanning line which becomes an object at its every time, the block of a value different from the immediately previous block on the block train becomes a varied block. Subsequently, an address of the block to be encoded is set to a prescribed value, respectively, a picture of a gradation of a multilevel is encoded with high compressibility, and its code is reproduced successively.