求翻译：车牌识别是图像处理领域的重要课题，它包括车牌图像的预处理、车牌定位、字符分割和字符识别等重要的部分，其中车牌图像预处理和定位的优劣直接决定着车牌识别准确率的高低。本文提出了图像预处理的优化方法和步骤，并且在计算机中进行了实现；同时给出和比较了一些典型定位的方法。是什么意思？

Important issues for vehicle license plate recognition is a field of image processing, which includes license plate image preprocessing, positioning, segmentation, and license plate character recognition and other important part of the license plate image preprocessing and positioning of the merits of which directly determines the level of vehicle license plate recognition accuracy. Proposed method and optimization of image preprocessing steps in this article, and has performed in a computer implementation; gives both and compare some typical methods of positioning.