scholarly journals Hybrid Algorithm for the detection of Pixel-based digital image forgery using Markov and SIFT descriptors

2021 ◽  
Author(s):  
Jimmy alexander Cortés Osorio ◽  
José Andrés Chaves Osorio ◽  
Cristian David López Robayo
Keyword(s):  
Digital Images ◽  
Low Cost ◽  
Digital Cameras ◽  
Image Size ◽  
Legal Process ◽  
Image Forgery ◽  
The Public ◽  
Process Modification ◽  
Digital Image Forgery ◽  
Typical Process

Today, image forgery is common due to the massification of low-cost/high-resolution digital cameras, along with the accessibility of computer programs for image processing. All media is affected by this issue, which makes the public doubt the news. Though image modification is a typical process in entertainment, when images are taken as evidence in a legal process, modification cannot be considered trivial. Digital forensics has the challenge of ensuring the accuracy and integrity of digital images to overcome this issue. This investigation introduces an algorithm to detect the main types of pixel-based alterations such as copy-move forgery, resampling, and splicing in digital images. For the evaluation of the algorithm, CVLAB, CASIA V1, Columbia, and Columbia Uncompressed datasets were used. Of 7100 images evaluated, 3666 were unaltered, 791 had resampling, 2213 had splicing, and 430 had copy-move forgeries. The algorithm detected all proposed forgery pixel methods with an accuracy of 91%. The main novelties of the proposal are the reduced number of features needed for identification and its robustness for the file format and image size.

scholarly journals 3D Reconstruction of Exposed Underground Utilities Using Photogrammetric Methods

2021 ◽  
Author(s):  
Wensong Hu
Keyword(s):  
3D Reconstruction ◽  
Digital Images ◽  
Low Cost ◽  
Three Dimensional ◽  
Lookup Table ◽  
Image Point ◽  
Digital Cameras ◽  
Study Results ◽  
Underground Utilities ◽  
3D Information

This thesis addresses the topic of three-dimensional (3D) reconstruction of exposed underground utilities using photogrammetric methods. Research on this topic is mainly motivated by the need for improved information on the location of underground utilities and, thus, to provide reliable information for the management of buried assets. In this thesis, a system of photogrammetric software programs is developed for 3D reconstruction of underground utilities. Camera calibration programs are used for computing interior elements and lens distortion coefficients of digital cameras and saving them in a lookup table (LUT). The accuracy of calibrated image coordinates satisfies the photogrammetric processing demand. An automatic image point detection method is proposed and achieved in these programs. External orientation programs are used for calculating exterior elements of the digital images. Based on geographic information system (GIS) and global positioning system (GPS) techniques, a new ground control points (GCPs) collection method is proposed and implemented in these programs. A 3D reconstruction program provides corresponding functions to obtain and edit 3D information of underground utilities. Epipolar lines are employed as an assisting tool that helps operators easily find homologous points from different digital images. The study results indicate that photogrammetric methods for reconstructing 3D information of underground utilities are effective and low cost.

scholarly journals Rapid quantification of cryoconite: granule geometry and in situ supraglacial extents, using examples from Svalbard and Greenland

2010 ◽  
Vol 56 (196) ◽  
pp. 297-308 ◽  
Author(s):  
Tristram D.L. Irvine-Fynn ◽  
Jonathan W. Bridge ◽  
Andrew J. Hodson
Keyword(s):  
Spatial Scales ◽  
Low Cost ◽  
Image Data ◽  
Major Axis ◽  
Primary Data ◽  
Digital Cameras ◽  
The Public ◽  
Automated Processing ◽  
Public Domain Software

AbstractSupraglacial dust (cryoconite) is an important but poorly understood component of the glacial system. There is a lack of primary data on cryoconite form, extent and dynamics. Here we present a suite of rapid, low-cost methodologies for quantification of granule geometry and supraglacial cryoconite coverage using image data captured by commercially available digital cameras. We develop robust, transferable protocols for analysis of (1) cryoconite granule geometry (major axis, Feret diameter, circularity); (2) centimetre–metre scale supraglacial extent (m2cryoconite m−2surface); and (3) temporal change in supraglacial extent at hourly intervals over several days. Image-processing methodologies were developed using the public domain software ImageJ. Manual (supervised) controls were used to estimate sources of error, and measurements then automated using simple scripting tools (macros). Fully automated processing successfully identified ∼90% of a sample of isolated granules ranging between 2.5 and 39.2 mm, with uncertainties of <20%. Particle sphericity (inferred from circularity) decreased as particle size increased. Supraglacial cryoconite extent was obtained with a mean uncertainty of 37% and 22% for data from field sites in Greenland and Svalbard, respectively. These methods will facilitate acquisition and analysis of datasets for cryoconite across a range of spatial scales, supporting research into cryoconite impacts on supraglacial hydrological connections, nutrient and carbon cycling, and initiation of primary succession in deglaciating environments.

scholarly journals Digital Image Forgery Detection

2019 ◽  
Vol 8 (2S3) ◽  
pp. 658-661
Keyword(s):  
Digital Image ◽  
Digital Images ◽  
Image Manipulation ◽  
Forgery Detection ◽  
Image Forgery ◽  
Detection Techniques ◽  
Naked Eye ◽  
Image Forgery Detection ◽  
Crime Investigation ◽  
Digital Image Forgery

With the growing challenges in authenticity and integrity of images, image manipulation has crumbled assurance over digital image. The major motivation of the forgery in image is manipulating the image in such a way that it cannot be distinguished to the naked eye. Image manipulation has increased the demand to assess the trustworthiness of digital images when used in crime investigation, as witness of law and for surveillance purposes. In this paper, various types of image forgery and detection techniques have been explained. Initially different kinds of forgery attacks are categorized and summary of passive approach is discussed

scholarly journals 3D Reconstruction of Exposed Underground Utilities Using Photogrammetric Methods

2021 ◽  
Author(s):  
Wensong Hu
Keyword(s):  
3D Reconstruction ◽  
Digital Images ◽  
Low Cost ◽  
Three Dimensional ◽  
Lookup Table ◽  
Image Point ◽  
Digital Cameras ◽  
Study Results ◽  
Underground Utilities ◽  
3D Information

This thesis addresses the topic of three-dimensional (3D) reconstruction of exposed underground utilities using photogrammetric methods. Research on this topic is mainly motivated by the need for improved information on the location of underground utilities and, thus, to provide reliable information for the management of buried assets. In this thesis, a system of photogrammetric software programs is developed for 3D reconstruction of underground utilities. Camera calibration programs are used for computing interior elements and lens distortion coefficients of digital cameras and saving them in a lookup table (LUT). The accuracy of calibrated image coordinates satisfies the photogrammetric processing demand. An automatic image point detection method is proposed and achieved in these programs. External orientation programs are used for calculating exterior elements of the digital images. Based on geographic information system (GIS) and global positioning system (GPS) techniques, a new ground control points (GCPs) collection method is proposed and implemented in these programs. A 3D reconstruction program provides corresponding functions to obtain and edit 3D information of underground utilities. Epipolar lines are employed as an assisting tool that helps operators easily find homologous points from different digital images. The study results indicate that photogrammetric methods for reconstructing 3D information of underground utilities are effective and low cost.

I Think We’re Alone Now

2020 ◽  
Vol 6 (4) ◽  
pp. 183-210
Author(s):  
Erin Nunoda
Keyword(s):  
Public Sphere ◽  
Digital Images ◽  
Empty Space ◽  
The Public ◽  
Youtube Videos ◽  
The Public Sphere

This article examines YouTube videos (primarily distributed by a user named Cecil Robert) that document so-called dead malls: unpopulated, unproductive, but not necessarily demolished consumerist sites that have proliferated in the wake of the 2008 recession. These works link digital images of mall interiors with pop-song remixes so as to re-create the experience of hearing a track while standing within the empty space; manipulating the songs’ audio frequencies heightens echo effects and fosters an impression of ghostly dislocation. This article argues that these videos locate a potentiality in abandoned mall spaces for the exploration of queer (non)relations. It suggests that the videos’ emphasis on lonely, unconsummated intimacies questions circuitous visions of the public sphere, participatory dynamics online, and the presumably conservative biopolitics (both at its height and in its memorialization) of mall architecture.

Opportunities for Qualitative Analysis of Social Media Platforms in Dietetic Research and Practice

2020 ◽  
pp. 1-5
Author(s):  
Meghan Lynch ◽  
Irena Knezevic ◽  
Kennedy Laborde Ryan
Keyword(s):  
Social Media ◽  
Low Cost ◽  
Online News ◽  
News Article ◽  
Discussion Forums ◽  
Research And Practice ◽  
The Public ◽  
Related Data ◽  
Social Media Platforms ◽  
Article Comment

To date, most qualitative knowledge about individual eating patterns and the food environment has been derived from traditional data collection methods, such as interviews, focus groups, and observations. However, there currently exists a large source of nutrition-related data in social media discussions that have the potential to provide opportunities to improve dietetic research and practice. Qualitative social media discussion analysis offers a new tool for dietetic researchers and practitioners to gather insights into how the public discusses various nutrition-related topics. We first consider how social media discussion data come with significant advantages including low-cost access to timely ways to gather insights from the public, while also cautioning that social media data have limitations (e.g., difficulty verifying demographic information). We then outline 3 types of social media discussion platforms in particular: (i) online news article comment sections, (ii) food and nutrition blogs, and (iii) discussion forums. We discuss how each different type of social media offers unique insights and provide a specific example from our own research using each platform. We contend that social media discussions can contribute positively to dietetic research and practice.

scholarly journals Contemporaneous Monitoring of the Whole Dynamic Earth System from Space, Part I: System Simulation Study Using GEO and Molniya Orbits

2021 ◽  
Vol 13 (5) ◽  
pp. 878
Author(s):  
Christopher Cullingworth ◽  
Jan-Peter Muller
Keyword(s):  
Climate Models ◽  
Low Cost ◽  
Earth Observation ◽  
Earth System ◽  
Specific Knowledge ◽  
Educational Value ◽  
Weather Forecasts ◽  
The Public ◽  
Global View ◽  
Disaster Monitoring

Despite the wealth of data produced by previous and current Earth Observation platforms feeding climate models, weather forecasts, disaster monitoring services and countless other applications, the public still lacks the ability to access a live, true colour, global view of our planet, and nudge them towards a realisation of its fragility. The ideas behind commercialization of Earth photography from space has long been dominated by the analytical value of the imagery. What specific knowledge and actionable intelligence can be garnered from these evermore frequent revisits of the planet’s surface? How can I find a market for this analysis? However, what is rarely considered is what is the educational value of the imagery? As students and children become more aware of our several decades of advance in viewing our current planetary state, we should find mechanisms which serve their curiosity, helping to satisfy our children’s simple quest to explore and learn more about what they are seeing. The following study describes the reasons why current GEO and LEO observation platforms are inadequate to provide truly global RGB coverage on an update time-scale of 5-min and proposes an alternative, low-cost, GEO + Molniya 3U CubeSat constellation to perform such an application.

Separation or Synthesis: A Holistic Approach to Therapeutics

1996 ◽  
Vol 17 (8) ◽  
pp. 279-283
Author(s):  
Kathi J. Kemper
Keyword(s):  
Health Care ◽  
Nurse Practitioners ◽  
Low Cost ◽  
Self Regulation ◽  
Holistic Approach ◽  
Medical Settings ◽  
The Public ◽  
Specialized Health Care ◽  
Definition Of ◽  
Spiritual Healers

Over the past 50 years, health care has grown more complex and specialized. Health-care institutions now are staffed with an array of specialist physicians, social workers, psychologists, therapists, and nutritionists as well as general practitioners and nurses. The types of providers outside of the hospital are even more numerous and diverse: physicians; nurses; nurse practitioners; chiropractors; counselors; acupuncturists; herbalists; spiritual healers; and purveyors of nutritional supplements, aromatherapy, crystals, and more. Intent on distinguishing their "products," providers focus on differences, polarizing into distinct camps such as "mainstream or traditional" versus "alternative or unconventional." Although these dichotomies are simple, they also can mislead. The definition of "alternative" is very dependent on the definition "mainstream"; acupuncture may be an alternative in one setting, but it clearly is traditional within Asian communities. Therapies that once were considered unconventional, such as hypnosis and meditation, have moved into many mainstream medical settings. (See Sugarman article "Hypnosis: Teaching Children Self-regulation" in the January 1996 issue of Pediatrics in Review.) The public wants health care that is low-cost, safe, effective, and personalized. Practitioners of "natural" therapies often are viewed as more humanistic and less technological than busy physicians. According to one study, in 1990, alternative medical therapies were used by nearly one third of Americans.1

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