| 摘要 |
PURPOSE:To prevent drop-out of narrow lines like ruled lines and flattening of fine characters or the like by selectively switching thinned picture elements between two thinning object picture element strings to reduce a picture. CONSTITUTION:In a line memory 11, binarized picture data Din is stored in plural line memories LM1 to LM3 to generate thinned picture element strings (b) and (c) and reference picture element strings (a) and (d). A first pattern matching circuit (PM1) 12 and a first selector circuit (DS1) detect a preliminarily set first specific pattern from picture element strings in the line memory 11 to select and output one thinned picture element string (b) or (c). A delay circuit 21 (D1 to D3) outputs picture element components (m), (n), (p), and (q) in the main scanning direction of the selected thinned picture element string (b) or (c) in parallel. A second pattern matching circuit (PM2) 22 and a second selector circuit (DS2) 24 detect a preliminarily set specific pattern from the output of four picture element components (m), (n), (p), and (q) to select and output the thinned picture element component (n) or (p) as picture data Dout. |
