复杂背景与不同光照下的面部检测方法

需积分: 10 2 下载量 30 浏览量 更新于2024-09-11 收藏 3.4MB PDF 举报
"本文探讨了一种在复杂背景和不同光照条件下使用YCbCr色彩空间和神经网络进行人脸识别的有效方法。该方法由两个阶段组成,首先利用颜色和三角形分割技术搜索潜在人脸区域,然后通过多层前馈神经网络进行人脸验证。系统能够处理不同大小的人脸、不同的光照条件、多样化的姿态和变化的表情。特别是在复杂背景下的人脸识别速度有显著提升,实验结果表明,该方法在速度和处理不同光照条件方面优于先前的方法。" 这篇研究论文提出了一种针对复杂背景和光照条件变化下的人脸检测策略。作者Chiunhsiun Lin来自台北科技大学,研究工作主要集中在提高在彩色图像中检测多人脸的能力,尤其是在环境复杂、光照条件变化的情况下。该方法的核心在于两步处理流程: 1. 颜色和三角形分割:在第一阶段,算法运用YCbCr色彩空间来区分人脸和背景。YCbCr色彩模型特别适合于图像处理,因为它将色彩信息与亮度信息分离,有助于在不同光照条件下识别肤色。同时,结合三角形分割技术,算法能够识别出图像中的潜在人脸区域,这有助于减少非人脸区域的误检。 2. 神经网络验证:在第二阶段,采用多层前馈神经网络对第一阶段找到的潜在人脸进行验证。神经网络经过训练,能够学习和理解人脸的各种特征,如眼睛、鼻子和嘴巴的位置,以及表情和姿态的变化。这使得系统能有效应对不同大小和姿态的人脸,以及各种表情变化。 该方法的一大优势是其在处理复杂背景时的执行速度。传统的人脸检测算法在背景复杂时可能会受到干扰,导致计算量增大,速度下降。然而,所提出的方案通过优化处理流程,显著提高了检测速度,尤其是在复杂背景下的表现。 实验结果显示,与之前的方法相比,该方法在处理速度和光照条件变化的适应性上都有显著提升。这表明该方法在实际应用中具有较高的潜力,可以更好地应对真实世界中不断变化的环境条件。 这篇研究为复杂环境和光照条件下的人脸检测提供了一个高效且鲁棒的解决方案,对于进一步推动人脸识别技术的发展具有重要意义。

用中文翻译:A coupled three-dimensional model is developed to study the internal parameter distributions of the MBPP fuel cell stack, considering fluid dynamics, electro-chemical reactions, multi-species mass transfer, twophase flow of water and thermal dynamics. The model geometry domains include anode MBPP, anode gas wavy flow field (5 parallel flow channels), anode GDL, anode catalyst layer (CL), membrane, cathode CL, cathode GDL, cathode gas wavy flow field (5 parallel flow channels), cathode MBPP and the two-layered coolant wavy flow fields at anode/cathode sides. According to the stack design, the design parameters of wavy flow fields for anode and cathode sides are the same but the phase deviation between their wave cycles presents 180◦. The two wavy flow fields of coolant, at the respective back sides of the anode and cathode plates, form the intercrossed two-layered coolant flow fields inside the MBPP, due to the phase difference of 180◦ between the wave cycles (Fig. 3). The mismatched flow field patterns between the neighbored fluid flows lead to complicated geometry and mesh building. The presented model geometry is divided into several layers (xz plane) according to the different domain materials so that the thin metallic plate and fluid domains with complicated 3D morphologies could be finely meshed layer by layer. As the real geometry of the experimental stack is too large for calculation, the modeled flow field consists of 5 parallel wavy channels, each of which includes 2 wave periods and corresponding inlet/outlet portions as well. To study the detailed thermal behavior of the presented design, the two-layered coolant fluid flow at the back side of the anode plate is considered and so is for the cathode plate. The counter flow operation is conducted where the air flows at the same direction with coolant but the opposite with hydrogen, shown in Fig. 3 (b).

2023-02-10 上传
2023-02-13 上传

用C++编写程序,实现以下问题2、题目ID Codes(POJ1146) Time Limit: 1000MS Memory Limit: 10000K 描述: It is 2084 and the year of Big Brother has finally arrived, albeit a century late. In order to exercise greater control over its citizens and thereby to counter a chronic breakdown in law and order, the Government decides on a radical measure--all citizens are to have a tiny microcomputer surgically implanted in their left wrists. This computer will contains all sorts of personal information as well as a transmitter which will allow people's movements to be logged and monitored by a central computer. (A desirable side effect of this process is that it will shorten the dole queue for plastic surgeons.) An essential component of each computer will be a unique identification code, consisting of up to 50 characters drawn from the 26 lower case letters. The set of characters for any given code is chosen somewhat haphazardly. The complicated way in which the code is imprinted into the chip makes it much easier for the manufacturer to produce codes which are rearrangements of other codes than to produce new codes with a different selection of letters. Thus, once a set of letters has been chosen all possible codes derivable from it are used before changing the set. For example, suppose it is decided that a code will contain exactly 3 occurrences of a', 2 of b' and 1 of c', then three of the allowable 60 codes under these conditions are: abaabc abaacb ababac These three codes are listed from top to bottom in alphabetic order. Among all codes generated with this set of characters, these codes appear consecutively in this order. Write a program to assist in the issuing of these identification codes. Your program will accept a sequence of no more than 50 lower case letters (which may contain repeated characters) and print the successor code if one exists or the message No Successor' if the given code is the last in the sequence for that set of characters. 输入: Input will consist of a series of lines each containing a string representing a code. The entire file will be terminated by a line consisting of a single #. 输出: Output will consist of one line for each code read containing the successor code or the words 'No Successor'. 样例输入 abaacb cbbaa # 样例输出 ababac No Successor

2023-05-22 上传