| 摘要 |
PURPOSE:To obtain a picture forming device that can realize good halftone by modulating the density of recording dot according to the proportion of black level or white level of a signal. CONSTITUTION:Out of four minute picture elements that constitute a picture element, number of for instance black level elements is counted, and counted value is alloted to each picture element as density rank number. This rank number is stored as picture information of each picture element. When writing is performed in buffer memories 1, 2, reading is made similarly from buffer memories 3, 4. Accordingly, out of 2X2 minute picture elements, number of, for instance, black level picture elements is outputted from adders 12, 13 as density rank number of 3 bits. Stored picture information is read out from a memory 15 in parallel 3 bits at a time, inputted to a D/A converter, and voltage value corresponding to the picture element density rank number is outputted to the line. |
