Matlab指纹图像处理全流程例程解析

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资源摘要信息:"本资源包含一系列使用Matlab编写的例程,主要用于处理和分析指纹图像。资源中涉及的关键技术包括指纹图像的离散化处理、特征提取以及Gabor滤波技术。这些技术是数字图像处理和生物特征识别领域的常见方法,尤其在指纹识别技术中扮演着重要角色。以下是这些技术的详细知识点解释和应用场景。 1. 指纹图像的离散化处理 指纹图像的离散化处理是指将连续的指纹图像转换为离散的数字图像的过程,以便于计算机进行存储和处理。在这个过程中,会用到一些图像处理的技术,如阈值处理、二值化、形态学操作等。二值化将图像转换为黑白色,这有助于突出指纹的脊线(即突出的部分),为后续的特征提取做准备。形态学操作则可以去除图像噪声,填补脊线断裂的空白,改善图像质量。 2. 特征提取 在指纹识别系统中,特征提取是核心环节之一。它涉及到从预处理后的图像中提取出能够代表指纹独特性的关键信息。这些特征通常包括脊线末端、脊线分叉点(即脊线的分岔处)、脊线的走向等。脊线末端和分叉点是稳定且具有区分度的特征点,对于匹配过程至关重要。提取这些特征点后,通常会通过特征点的坐标以及脊线的方向信息来构造指纹的特征向量。 3. Gabor滤波 Gabor滤波是一种线性滤波技术,广泛应用于信号处理、图像分析等领域。在指纹图像处理中,Gabor滤波器可以用于提取图像的纹理信息,特别是指纹图像中的脊线结构。Gabor滤波器因其具有良好的方向选择性和尺度选择性,特别适合于提取指纹图像中的细节特征。它通过卷积操作,可以增强指纹图像中脊线的纹理,同时抑制背景噪声和其他非指纹纹理的干扰,从而提高后续处理的准确性和效率。 在本资源中,还应包含Matlab编写的源码文件,文件名称为“指纹图像预处理源码”。这部分内容很可能是关于如何在Matlab环境下实现上述指纹图像处理技术的代码。通过运行这些源码,用户可以直观地了解和学习到指纹图像离散化、特征提取和Gabor滤波的具体实现方式和步骤。" 本资源对于学习和研究指纹识别技术的开发者和研究人员来说是极为宝贵的,它不仅包含了理论知识的解释,还提供了实际操作的代码示例。通过这些例程,学习者可以加深对数字图像处理和模式识别的理解,并且能够将理论知识应用于实际的工程实践中。同时,Matlab作为一种广泛使用的数学软件,其内置函数和工具箱提供了强大的图像处理能力,非常适合用于图像分析和算法实现。

7-3 Score Processing 分数 10 作者 翁恺 单位 浙江大学 Write a program to process students score data. The input of your program has lines of text, in one of the two formats: Student's name and student id, as <student id>, <name>, and Score for one student of one course, as <student id>, <course name>, <marks>. Example of the two formats are: 3190101234, Zhang San 3190101111, Linear Algebra, 89.5 Comma is used as the seperator of each field, and will never be in any of the fields. Notice that there are more than one word for name of the person and name of the course. To make your code easier, the score can be treated as double. The number of the students and the number of the courses are not known at the beginning. The number of lines are not known at the beginning either. The lines of different format appear in no order. One student may not get enrolled in every course. Your program should read every line in and print out a table of summary in .csv format. The first line of the output is the table head, consists fields like this: student id, name, <course name 1>, <course name 2>, ..., average where the course names are all the courses read, in alphabet order. There should be one space after each comma. Then each line of the output is data for one student, in the ascended order of their student id, with score of each course, like: 3190101234, Zhang San, 85.0, , 89.5, , , 87.3 For the course that hasn't been enrolled, leave a blank before the comma, and should not get included in the average. The average has one decimal place. There should be one space after each comma. And the last line of the output is a summary line for average score of every course, like: , , 76.2, 87.4, , , 76.8 All the number output, including the averages have one decimal place. Input Format As described in the text above. Output Format As described in the text above. The standard output is generated by a program compiled by gcc, that the round of the first decimal place is in the "gcc way". Sample Input 3180111435, Operating System, 34.5 3180111430, Linear Algebra, 80 3180111435, Jessie Zhao 3180111430, Zhiwen Yang 3180111430, Computer Architecture, 46.5 3180111434, Linear Algebra, 61.5 3180111434, Anna Teng Sample Output student id, name, Computer Architecture, Linear Algebra, Operating System, average 3180111430, Zhiwen Yang, 46.5, 80.0, , 63.2 3180111434, Anna Teng, , 61.5, , 61.5 3180111435, Jessie Zhao, , , 34.5, 34.5 , , 46.5, 70.8, 34.

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