BINARIZATION PROCESSOR

PURPOSE: To normally recognize the density boundary of a vertical scanning direction in addition to the recognition of density boundary of a horizontal scanning direction. CONSTITUTION: A density signal photoelectrically converted by a CCD 2 is inputted to an A/D converter 3 by each pixel in accordance with a clock and converted into multi-gradation digital data, which are outputted to a line memory 4 and a latch 6. The latch 6 delays the data by one clock and outputs the delayed density signal to an average density calculation part 10. The memory 4 delays each density signal successively inputted from the converter 3 by one horizontal scanning and outputs the delayed signal to the calculation part 10, a latch 7 and a line memory 5. The latch 7 delays the input signal by one clock and outputs the delayed signal to the calculation part 10, a latch 8 and a binarizing processing part 12. The latch 8 delays the input signal by one clock and outputs the delayed signal to the calculation part 10. The memory 5 delays each density signal successively inputted from the memory 4 by one horizontal scanning and outputs the delayed signal to a latch 9. The latch 9 delays the input signal by one clock and outputs the delayed signal to the calculation part 10.