특징 추출은 입력 데이터를 인식이 더 잘 될 수 있도록 변환된 영역의 특징 벡터로 변환하는 과정으로 볼 수 있다. 특징벡터가 갖추어야 할 주요 특성은 손실되는 정보량이 가능한 적어야 된다는 것이다. 또한, 높은 인식률을 얻기 위해서, 동일 클래스에 포함된 특징 벡터의 편차는 적도록 만들어야 한다. 본 논문에서는, 방향각 누적 특징을 기반으로 개발된 몇 가지 새로운 특징을 필기 숫자 인식에 적용하였다. 특징을 추출하기 위하여 입력된 이진 영상의 비선형 정규화, 영상의 크기에 의한 특징 정규화, 영상의 전경 영역에 의한 특징 정규화 등의 여러 가지 방법이 적용되었다. 실제 우편물에서 추출된 필기 숫자 데이터베이스를 실험에 사용하였으며, 제안된 방법이 필기 숫자 인식에 효과적으로 적용될 수 있다는 것을 결과에서 보여주고 있다.
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