Experiments showed this approach can perform calculation more quickly , precisely , and robustly . not only does this method did well in gray level images , but also in binary images and color images 实验证实这种方法有很好的鲁棒性、计算结果准确、计算速度快，而且该算法不仅可用于灰度图像的方向场计算，也可用于二值图像和彩色图像的方向场计算。
At last , in order to further explore the practicality of fusion pattern recognition , we use multimodal biometrics , which is based on fingerprint and hand geometry to validate the availability of the third method 最后，引入基于指纹方向场和手形特征的多模态生物特征识别实验对上面的决策层融合识别方法进行验证，为信息融合在模式识别方法中的实用化做出一点探索。
Making use of image processing and synergetic identifying technique , i have worked on two different fingerprint - based identification modes , namely verification " and " identification " . the approach of two modes has been proposed and implemented with c + + program language in this paper 结合数字图像处理技术和协同识别技术，以指纹图像方向场作为指纹的特征信息，对“验证”和“识别”这两种指纹识别模式分别进行研究，并以vc + + 6 . 0为平台，编程实现了算法。
Moreover , aiming at the location of inclined license plate , we have proposed the algorithm based on gray changing characteristic and orientation field . in this section , we discussed in detail the application of mathematical morphology operator in rough locating objective region and introduced the theory and realization method of orientation field . then we used it to detect inclined angel of objective region , finally we can precisely locate and emendate the inclined license plate based on detection result , and so we provided the favorable foundation for segmenting character 此外针对倾斜车牌区域的定位分割问题，提出了基于灰度变化特性和方向场计算的定位算法，其中详细讨论了数学形态学算子在目标区域粗定位中的应用，重点介绍了方向场计算理论和实现方法，并将其应用于目标区域倾斜角度的检测，根据检测得到的结果进行了倾斜车牌区域的准确定位和校正，为后续的字符分割打下良好的基础。
We have studied pretreatment of fingerprint images with experiments , including all the algorithm implementations of the normalization of fingerprint image , estimation of orientation and frequency field , fingerprint image enhancement , extraction of fingerprint ridges , and thinning of fingerprint ridges . the result can be accepted 本文对指纹预处理进行了实验研究，编程实现了指纹图像归一化，指纹图像方向场的计算，频率的计算，指纹图像的滤波增强，指纹图像的纹线提取(二值化) ，纹线细化。
