| 摘要 |
PURPOSE:To obtain an image processing device capable of using a delay memory and other circuits used for a secondary filter and a binarizing circuit in a common and integral manner by a method wherein multivalued image data inputted from a first input means is multiplexed or added with a signal inputted from a second input means to be binarized. CONSTITUTION:An inputted multivalued image signal is multiplexed by a multiplexer 5 and inputted to an error addition circuit 6. In the adder, a diffu sion error e1 is added to the signal. The signal outputted from the adder is passed through a latch to be delayed for one pixel. The image signal with a 5-pixel delay is outputted as a pixel signal. The multiplexed signal of the image signal with the error signal outputted from the error addition circuit 6 is inputted to a line memory 1 to be added with error contents in an error addition circuit 7 and an error addition circuit 8. The signal has a 1-line delay each in line memories 3, 4 and inputted in a latch circuit 9. The signal is com pared with a threshold Vth by a comparator 12. As a result, the output is binarized. The binarized error E is processed through a gate and divided into error contents e1 - e12 by a diffusion error calculation circuit 16 to be diffused rearward by the error addition circuits 6, 7, and 8. |
