CAJ | 학술논문

车牌识别系统是智能交通的重要组成部分，在日益凸显的道路交通问题上发挥着举足轻重的作用。车牌的倾斜校正是字符分割和字符识别正确与否的一个重要因素。旋转投影变换法能够很好地解决车牌倾斜的问题，但是对一个特定范围内的所有角度进行此变换，增加了计算所需要的时间。为了降低算法所需要的时间，文中结合旋转投影变换法，在此基础上根据旋转后投影的直方图必有一个峰值的特点，提出了变步长的旋转投影变换方法。仿真表明，在相同的情况下，改进的算法的运行时间得到改善。
차패식별계통시지능교통적중요조성부분，재일익철현적도로교통문제상발휘착거족경중적작용。차패적경사교정시자부분할화자부식별정학여부적일개중요인소。선전투영변환법능구흔호지해결차패경사적문제，단시대일개특정범위내적소유각도진행차변환，증가료계산소수요적시간。위료강저산법소수요적시간，문중결합선전투영변환법，재차기출상근거선전후투영적직방도필유일개봉치적특점，제출료변보장적선전투영변환방법。방진표명，재상동적정황하，개진적산법적운행시간득도개선。
The license plate recognition system is important part in intelligent transportation,which plays an crucial role for road transpor-tation problem concerned. The license plate tilt is an important factor of character segmentation and recognition. The rotating projection transformation is an effective way to solve the problem,but it will cost much time to calculate for transformating in every angle within a specified range. A rotating projection transformation based on variable step is presented for the following reasons. There is a peak on the rotated projection histogram that generated by the rotating projection transform. The new method would reduce the time needed by the al-gorithm. The simulation results show that,in the same case,the improved algorithm running time is improved.