The time information recorded in a vehicle black box or CCTV is displayed in the text time(ex: YYYY/MM/DD hh:mm:ss). However, when restoring images from inactive areas, temporary files, or damaged video files, there could be a problem that the sequence of images restored to frame units is not arranged in that of the actual recorded time. To resolve this issue, we recognize time information recorded in text format at the top or bottom of the image, and rename the image file via the recognized time information. At that time, images that have been renamed and sorted chronologically can be made into continuous videos. In this paper, Optical Character Recognition(OCR) was used to recognize time information. OCR-related research has continued for a long time and has recently been available through many open sources. Thus, time information of the image is extracted by applying Convolutional Recurrent Neural Network(CRNN) based OCR, Tesseract OCR, and EasyOCR. The expression of time information in vehicle black boxes and CCTV is expressed in various ways(ex: text font, background and text size). The performance of each OCR was compared and analyzed through test images of time information presented in various forms. It was shown from the comparative analysis that the CRNN-based method has the highest recognition performance among OCRs used in the experiment. Moreover, it was confirmed that a prediction rate is approximately 5 times faster for predicting a single image.
목차
Abstract Ⅰ. 서론 Ⅱ. 관련 연구 1. Tesseract OCR 구조 2. EasyOCR 구조 3. Convolution Neural Network(CRNN) OCR 구조 Ⅲ. 성능 평가 1. 성능 평가 환경 및 방법 2. TesseactOCR, EasyOCR, 및 CRNN OCR 에 대한 비교 실험결과 Ⅳ. 결론 및 고찰 Ⅴ. 사사 Ⅵ. 참고문헌
키워드
Convolutional Recurrent Neural Network(CRNN)EasyOCROptical Character Recognition(OCR)TesseractTime information
저자
김용진 [ Yong Jin Kim | 국립과학수사연구원 디지털과 연구원, 감정관 ]
박남인 [ Nam In Park | 국립과학수사연구원 디지털과 연구원, 감정관 ]
Corresponding Author
법과학 분야는 사회정의 구현에 있어 크나큰 가치가 있음에도 불구하고 우리나라에서는 이 분야에 대한 인식이 미흡하여 선진 외국에 비해 침체되어 있는 실정이다. 이에 우리나라에서도 법과학 분야와 관련 있는 학계, 연구기관, 수사기관 등 유관 단체들로 구성된 한국 법과학회를 창립하여 이 분야를 활성화 시켜 과학수사를 한층 더 발전시키기 위함을 목적으로 한다.