Image source detection : a case study on Facebook images taken by iPhones

Forged and tempered digital images become increasingly common on Facebook to aid computer frauds. The situation is worsened as many users can use a phone to take a photo and upload it to Facebook within two clicks, which highlights the need of image forensics for the cyber fraud cases. In this paper, we show the existence of the Facebook image filter which automatically changes the Facebook photos and consequently challenges the validity of forensic results. We aim to enable forensic investigators to relate a seized camera and a Facebook image. Specifically, we utilize intrinsic sensor pattern noise produced by a camera's lens to derive forensically useful information as Photo Response Non-Uniformity (PRNU) patterns. We propose to compare the PRNU patterns of a Facebook image and the flat field images produced by the candidate cameras. And we conclude this method to be effective by successfully identifying the correct iPhone from a list of four for a given Face book image.

High reproducibility of patellar tendon vascularity assessed by colour doppler ultrasonography : a reliable measurement tool for quantifying tendon pathology

Background: This study examined whether patellar tendon vascularity could be quantified accurately in the clinical setting using colour Doppler ultrasonography.

Methods: A sonographer and two radiologists visually estimated tendon vascularity in millimetres in 74 tendons during ultrasound (US) examination and from hard copy films. These estimates were then compared to the length of vessels measured from the digital image in millimetres and the correlation between them was determined. A subset of 16 tendons was used to compare the estimates of vascularity by two examiners at US examination.

Results: The estimation of vascular length at US examination correlated highly with the measured vascular length (r = 0.92; 95% confidence interval (CI) 0.87 to 0.94), as did the length estimated from the films (r = 0.94; 95% CI 0.9 to 0.96). The correlation between examiners was 0.84 (95% CI 0.51 to 0.94) for the estimates made during US examination and 0.85 (95% CI 0.59 to 0.95) for the vessel lengths measured from the digital images.

Conclusions: These excellent correlations indicate that tendon vascularity can be reliably estimated using colour Doppler ultrasonography and tendon vascularity could therefore be used by clinicians to rate clinical change. This method of quantifying tendon vascularity could also be used in research to investigate the effects of tendon treatments on vascularity.

Designing open-ended problems to challenge preservice teachers' views on mathematics and pedagogy

This study examines preservice elementary teachers' reported experiences of posing open-ended mathematics problems. Responses of 33 students in a mathematics teacher education course were analysed for the strategies participants used, what they learned and the challenges encountered from an opportunity to collect digital images and pose open-ended problems related to those images. Results indicate that preservice teachers reported a shift in the ways they viewed mathematics and how it might be taught. The school curriculum both constrained and provided possibilities for preservice teachers in noticing mathematics beyond the textbook and mathematics classroom. This study adds to our understanding of teaching as a learning practice and the art of posing mathematical problems as a significant aspect of that practice.

Designing problems : what kinds of open-ended problems do preservice teachers pose?

This paper describes preservice teachers' reported experience of problem posing based on self-selected original digital images. The 176 participants from Australia and Canada designed open-ended problems as part of their mathematics education course. Their 444 problems and accompanying photos have been analysed lo explore the types of problems posed and the focus of the mathematical connections. Findings indicate that preservice teachers are challenged when posing open-ended problems however, this process enables them to develop strategies for problem posing and to become more critically aware of the mathematical potential within their environment.

Immersive interfaces for art education teaching and learning in mixed reality virtual and real world environments

Selected ubiquitous technologies encourage collaborative participation between higher education students and educators within a virtual socially networked e-learning landscape. Multiple modes of teaching and learning, ranging from real world experiences, to text and digital images accessed within the Deakin Studies Online learning management system and a constructed virtual world in which the user’s creative imagination transports them to the “other side” of their computer screens is discussed in this paper. These constructed environments support interaction between communities of learners and enable multiple simultaneous participants to access graphically built 3D environments, interact with digital artifacts and various functional tools and represent themselves through avatars, to communicate with other participants and engage in collaborative art learning. A narrative interpretative research approach was used to profile the 21st century higher education student learner, to investigate the lived experience and multiple art learning perspectives documented in student visual journal entries and art educator observations to ascertain if an e-technology rich augmented learning environment resulted in the establishment of more effective e-learning communities of practice.

Immersive interfaces for art education teaching and learning in virtual and real world learning environments

Click if you like this, or OCCUPY as spectacle : a technological derive

This paper is the textual component of a dialogic, performative, multi-media lecture that rereads Guy Debord’s, The Society of the Spectacle (1967) with reference to the global Occupy movement, and the role social media, and the proliferation of digital images play in the facilitation and hindrance of this recent form of political activism. It explicitly addresses the connections between global capitalism, public space and digital technology by responding to selective quotations from Debord’s book in creative and anecdotal registers.

Immersive interfaces for art education teaching and learning in virtual and real world learning environments

Selected ubiquitous technologies encourage collaborative participation between higher education students and educators within a virtual socially networked e-learning landscape. Multiple modes of teaching and learning, ranging from real world experiences, to text and digital images accessed within the Deakin Studies Online learning management system and a constructed virtual world in which the user's creative imagination transports them to the “other side” of their computer screens is discussed in this paper. These constructed environments support interaction between communities of learners and enable multiple simultaneous participants to access graphically built 3D environments, interact with digital artifacts and various functional tools and represent themselves through avatars, to communicate with other participants and engage in collaborative art learning. A narrative interpretative research approach was used to profile the 21st century higher education student learner, to investigate the lived experience and multiple art learning perspectives documented in student visual journal entries and art educator observations to ascertain if an e-technology rich augmented learning environment resulted in the establishment of more effective e-learning communities of practice.

Digitizing archival records: benefits and challenges of a large professional accounting association

With antecedents extending to 1886, CPA Australia is one of the world’s most significant professional accounting associations. Reflective of its long history and widespread influence, the organization holds an extensive and diverse archive that evidences both its own development and the general evolution of accounting and business practices. This article presents a case study of a project to digitize selected aspects of this archive. Informed by perspectives on managing archives in the digital era, the benefits and challenges of digitization are presented. A key benefit was enabling access to digital images while preserving rare and fragile original records and documents. However, challenges arose in prioritizing the items for digitization, and this necessitated the development of a model, taking the form of a decision matrix. The CPA Australia case study will be informative for other organizations seeking to use digitization as a means to overcome the dilemma associated with providing access to archival materials while also ensuring their preservation.

Anticipating the uptake and possible implication of digital imaging within the construction industry

Photography within the construction industry is merging into a new form of image capture and output that is a mix of conventional photography and digital imagery. As this transition takes place it is anticipated that the credibility of the image may also change within in the communication chain that links the various disciplines within the building industry. The following paper presents the development and results of a pilot survey of building professionals, which addresses the quality, content and authenticity of both conventional photography and digitally produced images used within the construction industry.

Changing preferences : conventional photography to digital imaging in communicating architecture

Architectural photography is merging into a new form of image capture and output which is a mix of conventional photography and digital imagery. As this transition takes place it is anticipated that the credibility of the image may also change. the aim of the project is to research the perception of the quality, content and authenticity of both conventional photography and digitally produced images used within the architectural profession.

Many versions of masculine : an exploration of boys' identity formation through digital storytelling in an afterschool program

Both scholarly literature and popular media often depict predominantly negative and one-dimensional images of boys, especially African-American boys. Predictions of these boys’ anticipated difficulties in school and adulthood are equally prevalent. This paper reports qualitative research that features case studies of nine urban boys of color, aged nine to eleven, who participated in an afterschool program where they learned to create digital multimedia texts. Drawing on an analysis of the children’s patterns of participation, their multimodal products, and their social and intellectual growth over time, the study revealed that these children demonstrated many versions of male selves, and that their digital stories narrated these identities in ways that often challenged hegemonic versions of masculinity. These enactments of identity were made possible by the ways that their afterschool social space structured their activities, as well as by the symbolic means and subject matters privileged in that space, principally digital multimodal narratives and popular culture. At a time when afterschool programs are under pressure to become extensions of the school day, this research argues for recognition of and support for the different functions such programs can serve when structured as alternative spaces for learning and identity formation.

Automatic detection of lung nodule from computer tomography images

Lung nodule refers to lung tissue abnormalities that may become cancerous. An automated system that detects nodules of common sizes within lung images is developed. It consists of acquisition, pre-processing, background removal, nodule detection, and false positives reduction. The system can assist expert radiologists in their decision making.

A digital watermarking scheme for Bezier surfaces

Owners and vendors are increasingly publishing their materials in digital form. Because such materials can be exactly copied, a mechanism is required that will protect the legitimate owners of these works, by providing proof of original ownership. Digital watermarking has now become one accepted method of establishing ownership of digital materials. The owner of a work embeds a pattern, called a digital watermark, in the content. This embedded watermark is normally undetectable, but its presence can be demonstrated by the owner of the work or his agent, thereby proving ownership. Digital watermarking has been used for many types of multimedia content, primarily audio, video and flat images. Recently, interest has been shown in applying digital watermarking schemes to 3D surfaces, in various formats. In this paper, we examine a method whereby a digital watermark can be embedded in a Bezier surface. A prototype watermarking method for such surfaces is presented, with some experimental results, and a discussion of directions for future research.