Abstract
Drill texts are used with the aim of iterative practice. But drill texts are usually used by directly penciling. So repetitive using is difficult. This paper proposes the method to eliminate penciling from used drill texts. Mounting such function in photocopiers will solve above problem. Proposed method uses image feature of writing materials to eliminate penciling. Distinction of penciling by image feature materializes the elimination whatever their shapes. Experimental results show that penciling could be eliminated using proposed method with above 99% accuracy. And there was little false elimination of machine printing with proposed method.
