CODING SYSTEM OF FACSIMILE PICTURE

PURPOSE:To improve remarkably picture quality in comparison with the degree of transmission time by applying an initial coding and coding of modes 1, 2, dividing the value between DELTAX picture element and DELTAY line so as to repeat the coding of the modes 1, 2. CONSTITUTION:The picture performing coding as the initial state is stored to a one-screen memory 101. In this case, a white picture element is expressed as [0] and a black picture element is expressed as [1]. The first DELTAX and DELTAY values are stored to a DELTAX, DELTAY memory 111 from a coding mode control circuit 102, [0] to a mode selection memory 112 and [0] to a state memory 113. At the coding of the procedure 1-2, when the circuit 102 opens a gate 144, the content of the memory 111 is transferred to code picture element extracting circuits 121-123. These circuits read sequentially the value of picture element coded by the procedure 1-2 from the memory 101 and transfers it to a run length coding circuit 151. The circuit 151 decides the run length coding on the condition that both signals received from the memories 112, 113 are at [0] and codes a picture signal from an extraction circuit.