2,175 research outputs found
Pilot investigation of remote sensing for intertidal oyster mapping in coastal South Carolina: a methods comparison
South Carolina’s oyster reefs are a major component of the coastal landscape. Eastern oysters Crassostrea virginica are an important economic resource to the state and serve many essential functions in the environment, including water filtration, creek bank stabilization and habitat for
other plants and animals. Effective conservation and management of oyster reefs is dependent on an understanding of their abundance, distribution, condition, and change over time. In South Carolina, over 95% of the state’s oyster habitat is intertidal. The current intertidal oyster reef database for South Carolina was developed by field assessment over several years. This database was completed in the early 1980s and is in need of an update to assess resource/habitat status and trends across the state. Anthropogenic factors such as coastal development and
associated waterway usage (e.g., boat wakes) are suspected of significantly altering the extent and health of the state’s oyster resources.
In 2002 the NOAA Coastal Services Center’s (Center) Coastal Remote Sensing Program (CRS) worked with the Marine Resources Division of the South Carolina Department of Natural Resources (SCDNR) to develop methods for mapping intertidal oyster reefs along the South Carolina coast using remote sensing technology. The objective of this project was to provide SCDNR with potential methodologies and approaches for assessing oyster resources in a more
efficiently than could be accomplished through field digitizing. The project focused on the utility of high-resolution aerial imagery and on documenting the effectiveness of various analysis techniques for accomplishing the update. (PDF contains 32 pages
Inteligentni sustav strojnog vida za automatiziranu kontrolu kvalitete keramičkih pločica
U članku je prikazan automatizirani sustav za vizualnu kontrolu kvalitete
keramičkih pločica uporabom strojnog računalnog vida. Proces proizvodnje
keramičkih pločica u gotovo svim svojim fazama zadovoljavajuće je
automatiziran, osim u fazi kontrole kvalitete, na kraju procesa. Kvaliteta
keramičkih pločica provjerava se i ocjenjuje postupcima vizualne provjere
kvalitete, gdje se ljudski čimbenik nastoji zamijeniti sustavom strojnog
računalnog vida u funkciji povećanja kvalitete i povećanja efikasnosti
proizvodnje. Kvaliteta keramičkih pločica definirana je dimenzijama i
površinskim značajkama. Predstavljeni sustav strojnog vida analizira
geometrijske i površinske značajke te odlučuje o kvaliteti keramičkih
pločica na temelju navedenih značajki uporabom klasifikatora s
neuronskom mrežom. Predstavljene su također i metode koje poboljšavaju
izdvajanje geometrijskih i površinskih svojstava. Potvrđena je efikasnost
obradnih algoritama i primjena neuronskog klasifikatora kao zamjene za
vizualnu kontrolu kvalitete ljudskim vidom
Traceable and Authenticable Image Tagging for Fake News Detection
To prevent fake news images from misleading the public, it is desirable not
only to verify the authenticity of news images but also to trace the source of
fake news, so as to provide a complete forensic chain for reliable fake news
detection. To simultaneously achieve the goals of authenticity verification and
source tracing, we propose a traceable and authenticable image tagging approach
that is based on a design of Decoupled Invertible Neural Network (DINN). The
designed DINN can simultaneously embed the dual-tags, \textit{i.e.},
authenticable tag and traceable tag, into each news image before publishing,
and then separately extract them for authenticity verification and source
tracing. Moreover, to improve the accuracy of dual-tags extraction, we design a
parallel Feature Aware Projection Model (FAPM) to help the DINN preserve
essential tag information. In addition, we define a Distance Metric-Guided
Module (DMGM) that learns asymmetric one-class representations to enable the
dual-tags to achieve different robustness performances under malicious
manipulations. Extensive experiments, on diverse datasets and unseen
manipulations, demonstrate that the proposed tagging approach achieves
excellent performance in the aspects of both authenticity verification and
source tracing for reliable fake news detection and outperforms the prior
works
Inteligentni sustav strojnog vida za automatiziranu kontrolu kvalitete keramičkih pločica
Intelligent system for automated visual quality control of ceramic tiles based
on machine vision is presented in this paper. The ceramic tiles production
process is almost fully and well automated in almost all production stages
with exception of quality control stage at the end. The ceramic tiles quality
is checked by using visual quality control principles where main goal is to
successfully replace man as part of production chain with an automated
machine vision system to increase production yield and decrease the
production costs. The quality of ceramic tiles depends on dimensions and
surface features. Presented automated machine vision system analyzes
those geometric and surface features and decides about tile quality by
utilizing neural network classifier. Refined methods for geometric and
surface features extraction are presented also. The efficiency of processing
algorithms and the usage of neural networks classifier as a substitution for
human visual quality control are confirmed.U članku je prikazan automatizirani sustav za vizualnu kontrolu kvalitete
keramičkih pločica uporabom strojnog računalnog vida. Proces proizvodnje
keramičkih pločica u gotovo svim svojim fazama zadovoljavajuće je
automatiziran, osim u fazi kontrole kvalitete, na kraju procesa. Kvaliteta
keramičkih pločica provjerava se i ocjenjuje postupcima vizualne provjere
kvalitete, gdje se ljudski čimbenik nastoji zamijeniti sustavom strojnog
računalnog vida u funkciji povećanja kvalitete i povećanja efikasnosti
proizvodnje. Kvaliteta keramičkih pločica definirana je dimenzijama i
površinskim značajkama. Predstavljeni sustav strojnog vida analizira
geometrijske i površinske značajke te odlučuje o kvaliteti keramičkih
pločica na temelju navedenih značajki uporabom klasifikatora s
neuronskom mrežom. Predstavljene su također i metode koje poboljšavaju
izdvajanje geometrijskih i površinskih svojstava. Potvrđena je efikasnost
obradnih algoritama i primjena neuronskog klasifikatora kao zamjene za
vizualnu kontrolu kvalitete ljudskim vidom
Sensor Pattern Noise Estimation Based on Improved Locally Adaptive DCT Filtering and Weighted Averaging for Source Camera Identification and Verification
Photo Response Non-Uniformity (PRNU) noise is a sensor pattern noise characterizing the imaging device. It has been broadly used in the literature for source camera identification and image authentication. The abundant information that the sensor pattern noise carries in terms of the frequency content makes it unique, and hence suitable for identifying the source camera and detecting image forgeries. However, the PRNU extraction process is inevitably faced with the presence of image-dependent information as well as other non-unique noise components. To reduce such undesirable effects, researchers have developed a number of techniques in different stages of the process, i.e., the filtering stage, the estimation stage, and the post-estimation stage. In this paper, we present a new PRNU-based source camera identification and verification system and propose enhancements in different stages. First, an improved version of the Locally Adaptive Discrete Cosine Transform (LADCT) filter is proposed in the filtering stage. In the estimation stage, a new Weighted Averaging (WA) technique is presented. The post-estimation stage consists of concatenating the PRNUs estimated from color planes in order to exploit the presence of physical PRNU components in different channels. Experimental results on two image datasets acquired by various camera devices have shown a significant gain obtained with the proposed enhancements in each stage as well as the superiority of the overall system over related state-of-the-art systems
Blind Image Quality Assessment for Face Pose Problem
No-Reference image quality assessment for face images is of high interest since it can be required for biometric systems such as biometric passport applications to increase system performance. This can be achieved by controlling the quality of biometric sample images during enrollment. This paper proposes a novel no-reference image quality assessment method that extracts several image features and uses data mining techniques for detecting the pose variation problem in facial images. Using subsets from three public 2D face databases PUT, ENSIB, and AR, the experimental results recorded a promising accuracy of 97.06% when using the RandomForest Classifier, which outperforms other classifier
Authentication of Students and Students’ Work in E-Learning : Report for the Development Bid of Academic Year 2010/11
Global e-learning market is projected to reach $107.3 billion by 2015 according to a new report by The Global Industry Analyst (Analyst 2010). The popularity and growth of the online programmes within the School of Computer Science obviously is in line with this projection. However, also on the rise are students’ dishonesty and cheating in the open and virtual environment of e-learning courses (Shepherd 2008). Institutions offering e-learning programmes are facing the challenges of deterring and detecting these misbehaviours by introducing security mechanisms to the current e-learning platforms. In particular, authenticating that a registered student indeed takes an online assessment, e.g., an exam or a coursework, is essential for the institutions to give the credit to the correct candidate. Authenticating a student is to ensure that a student is indeed who he says he is. Authenticating a student’s work goes one step further to ensure that an authenticated student indeed does the submitted work himself. This report is to investigate and compare current possible techniques and solutions for authenticating distance learning student and/or their work remotely for the elearning programmes. The report also aims to recommend some solutions that fit with UH StudyNet platform.Submitted Versio
Exploiting Deep Features for Remote Sensing Image Retrieval: A Systematic Investigation
Remote sensing (RS) image retrieval is of great significant for geological
information mining. Over the past two decades, a large amount of research on
this task has been carried out, which mainly focuses on the following three
core issues: feature extraction, similarity metric and relevance feedback. Due
to the complexity and multiformity of ground objects in high-resolution remote
sensing (HRRS) images, there is still room for improvement in the current
retrieval approaches. In this paper, we analyze the three core issues of RS
image retrieval and provide a comprehensive review on existing methods.
Furthermore, for the goal to advance the state-of-the-art in HRRS image
retrieval, we focus on the feature extraction issue and delve how to use
powerful deep representations to address this task. We conduct systematic
investigation on evaluating correlative factors that may affect the performance
of deep features. By optimizing each factor, we acquire remarkable retrieval
results on publicly available HRRS datasets. Finally, we explain the
experimental phenomenon in detail and draw conclusions according to our
analysis. Our work can serve as a guiding role for the research of
content-based RS image retrieval
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