scholarly journals Hierarchic Clustering-Based Face Enhancement for Images Captured in Dark Fields

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 936
Author(s):  
Na Zheng ◽  
Haoting Liu ◽  
Zhiqiang Zhang
Keyword(s):  
Face Recognition ◽  
Image Quality ◽  
High Intensity ◽  
Recognition Accuracy ◽  
Dark Field ◽  
Face Image ◽  
Clustering Method ◽  
Low Intensity ◽  
Linear Transforms ◽  
The Face

A hierarchic clustering-based enhancement is proposed to solve the luminance compensation of face recognition in the dark field. First, the face image is divided into five levels by a clustering method. Second, the results above are mapped into three hierarchies according to the histogram thresholds. A low, a middle, and a high-intensity block are found. Third, two kinds of linear transforms are performed to the high and the low-intensity blocks. Finally, a center wrap function-based enhancement is carried out. Experiment results show our method can improve both the face recognition accuracy and image quality.

Face Recognition Algorithm Based on 3D Point Cloud Acquired by Mixed Image Sensor

2019 ◽  
Vol 23 (2) ◽  
pp. 366-369
Author(s):  
Tang-Tang Yi ◽  
Keyword(s):  
Face Recognition ◽  
Point Cloud ◽  
Recognition Accuracy ◽  
Image Sensor ◽  
Recognition Algorithm ◽  
Face Image ◽  
3D Point Cloud ◽  
3D Face ◽  
Face Images ◽  
The Face

In order to solve the problem of low recognition accuracy in recognition of 3D face images collected by traditional sensors, a face recognition algorithm for 3D point cloud collected by mixed image sensors is proposed. The algorithm first uses the 3D wheelbase to expand the face image edge. According to the 3D wheelbase, the noise of extended image is detected, and median filtering is used to eliminate the detected noise. Secondly, the priority of the boundary pixels to recognize the face image in the denoising image recognition process is determined, and the key parts such as the illuminance line are analyzed, so that the recognition of the 3D point cloud face image is completed. Experiments show that the proposed algorithm improves the recognition accuracy of 3D face images, which recognition time is lower than that of the traditional algorithm by about 4 times, and the recognition efficiency is high.

Histogram of Oriented Directional Features for Robust Face Recognition

2016 ◽  
Vol 4 (3) ◽  
pp. 35-51
Author(s):  
Almabrok Essa ◽  
Vijayan K. Asari
Keyword(s):  
Face Recognition ◽  
Feature Vector ◽  
Recognition Accuracy ◽  
Recognition System ◽  
Face Image ◽  
Main Role ◽  
K Nearest Neighbors ◽  
Gaussian Derivative ◽  
The Face ◽  
Robust Face Recognition

This paper presents an illumination invariant face recognition system that uses directional features and modular histogram. The proposed Histogram of Oriented Directional Features (HODF) produces multi-region histograms for each face image, then concatenates these histograms to form the final feature vector. This feature vector is used to recognize the face image by the help of k nearest neighbors classifier (KNN). The edge responses and the relationship among pixels are very important and play the main role for improving the face recognition accuracy. Therefore, this work presents the effectiveness of using different directional masks for detecting the edge responses on face recognition accuracy, such as Prewitt kernels, Kirsch masks, Sobel kernels, and Gaussian derivative masks. The performance evaluation of the proposed HODF algorithm is conducted on several publicly available databases and observed promising recognition rates.

Hybrid Biometrics and Watermarking Authentication

2017 ◽  
pp. 37-61
Author(s):  
Kareem Kamal A. Ghany ◽  
Hossam M. Zawbaa
Keyword(s):  
Face Recognition ◽  
Hybrid Approach ◽  
Personal Characteristics ◽  
Face Image ◽  
Discrete Wavelet ◽  
Dna Encoding ◽  
Security Authentication ◽  
The Face ◽  
Tools And Techniques

There are many tools and techniques that can support management in the information security field. In order to deal with any kind of security, authentication plays an important role. In biometrics, a human being needs to be identified based on some unique personal characteristics and parameters. In this book chapter, the researchers will present an automatic Face Recognition and Authentication Methodology (FRAM). The most significant contribution of this work is using three face recognition methods; the Eigenface, the Fisherface, and color histogram quantization. Finally, the researchers proposed a hybrid approach which is based on a DNA encoding process and embedding the resulting data into a face image using the discrete wavelet transform. In the reverse process, the researchers performed DNA decoding based on the data extracted from the face image.

The dynamics of autocratic coercion after the Cold War

2006 ◽  
Vol 39 (3) ◽  
pp. 387-410 ◽  
Author(s):  
Lucan A. Way ◽  
Steven Levitsky
Keyword(s):  
Cold War ◽  
High Intensity ◽  
The State ◽  
Intensity Measures ◽  
Post Cold War ◽  
Low Intensity ◽  
Regime Stability ◽  
State Apparatus ◽  
Different Types ◽  
The Face

This article examines coercive capacity and its impact on autocratic regime stability in the context of post-Soviet Armenia, Belarus, Georgia, and Ukraine. In the post-Cold War era, different types of coercive acts require different types of state power. First, high intensity and risky measures – such as firing on large crowds or stealing elections – necessitate high degrees of cohesion or compliance within the state apparatus. Second, effective low intensity measures – including the surveillance and infiltration of opposition, and various forms of less visible police harassment – require extensive state scope or a well-trained state apparatus that penetrates large parts of society. Coercive state capacity, rooted in cohesion and scope, has often been more important than opposition strength in determining whether autocrats fall or remain in power. Thus, the regime in Armenia that was backed by a highly cohesive state with extensive scope was able to maintain power in the face of highly mobilized opposition challenges. By contrast, regimes in Georgia where the state lacked cohesion and scope fell in the face of even weakly mobilized opposition. Relatively high scope but only moderate cohesion in Belarus and Ukraine has made autocratic regimes in these countries generally more effective at low intensity coercion to prevent the emergence of opposition than at high intensity coercion necessary to face down serious opposition challenges.

scholarly journals 3D Face Image Inpainting with Generative Adversarial Nets

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Tongxin Wei ◽  
Qingbao Li ◽  
Jinjin Liu ◽  
Ping Zhang ◽  
Zhifeng Chen
Keyword(s):  
Face Recognition ◽  
Recognition Performance ◽  
Image Inpainting ◽  
Face Image ◽  
Edge Information ◽  
3D Face ◽  
Face Images ◽  
The Face ◽  
Match Effect ◽  
Traditional Image

In the process of face recognition, face acquisition data is seriously distorted. Many face images collected are blurred or even missing. Faced with so many problems, the traditional image inpainting was based on structure, while the current popular image inpainting method is based on deep convolutional neural network and generative adversarial nets. In this paper, we propose a 3D face image inpainting method based on generative adversarial nets. We identify two parallels of the vector to locate the planer positions. Compared with the previous, the edge information of the missing image is detected, and the edge fuzzy inpainting can achieve better visual match effect. We make the face recognition performance dramatically boost.

The Safety Research for Face Recognition System Based on Image Feature and Digital Watermarking

2012 ◽  
Vol 224 ◽  
pp. 485-488
Author(s):  
Fei Li ◽  
Yuan Yuan Wang
Keyword(s):  
Face Recognition ◽  
Recognition Rate ◽  
Recognition System ◽  
Face Image ◽  
Image Feature ◽  
Safety Research ◽  
The Face ◽  
Information Image ◽  
Image Integrity ◽  
Recognition Software

Abstract: In order to solve the easily copied problem of images in face recognition software, an algorithm combining the image feature with digital watermark is presented in this paper. As watermark information, image feature of the adjacent blocks are embedded to the face image. And primitive face images are not needed when recovering the watermark. So face image integrity can be well confirmed, and the algorithm can detect whether the face image is the original one and identify whether the face image is attacked by malicious aim-such as tampering, replacing or illegally adding. Experimental results show that the algorithm with good invisibility and excellent robustness has no interference on face recognition rate, and it can position the specific tampered location of human face image.

Human Face Recognition and the Face Image Set′s Topology

1994 ◽  
Vol 59 (2) ◽  
pp. 254-261 ◽  
Author(s):  
M. Bichsel ◽  
A.P. Pentland
Keyword(s):  
Face Recognition ◽  
Face Image ◽  
Human Face ◽  
Human Face Recognition ◽  
The Face ◽  
Image Set
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