Original reader

Abstract

Abstract PURPOSE:To erase most of undesired shadows at a throat section without omitting the information of the throat section and its vicinity of a book original, by setting an appropriate slice level by referring to the peak value of each line. CONSTITUTION:Picture signals S of one line quantity outputted from a reading circuit 10 are divided into three parts and the peak values P1, P2, and P3 of the three parts are respectively latched by the 1st-3rd latches 14-16. The latched peak values P1-P3 are fetched by a control circuit 18 and the minimum peak value which is stored in the control circuit 18 is selected out of the peak values. Then the picture signals S of the 1st line are changed to binary signals D at a comparator 12 in accordance with a previously set initial slice level. The picture signals S of and after the 2nd line are also latched by the latches 14-16 similarly and the latched peak values P1-P3 are fetched by the control circuit 18 where they are compared with a prescribed value. The minimum peak value is selected out of the peak values larger than the prescribed value and a slice level SL is calculated. Then the picture signals S of one line quantity impressed upon the comparator 12 are binary coded.

Inventors

• 👤 Yuji Hojo
• 👤 北條　雄司
• 👤 Yoichiro Arimatsu
• 👤 洋一郎 有松

Bibliographic Details