2,936 research outputs found
A software framework for the development of projection-based augmented reality systems
Despite the large amount of methods and applications of augmented reality, there is little homogenization on the software platforms that support them. An exception may be the low level control software that is provided by some high profile vendors such as Qualcomm and Metaio. However, these provide fine grain modules for e.g. element tracking. We are more concerned on the application framework, that includes the control of the devices working together for the development of the AR experience. In this paper we present a software framework that can be used for the development of AR applications based on camera-projector pairs, that is suitable for both fixed, and nomadic setups.Peer ReviewedPostprint (author's final draft
Optical observations of a newly identified compact galaxy group near the Zone of Avoidance
We have identified a new group of galaxies, CG J0247+44.9, at low Galactic
latitude (l=143.64 deg, b=-13.29 deg), which satisfies Hickson's criteria
(Hickson 1997) for Compact Groups (CGs). Our group consists of six members, two
of which are in close interaction (IRAS 02443+4437). We present here optical
photometry (BVRI) and low resolution spectroscopy of the individual galaxies
and investigate the global properties of the group. Our morphological analysis
reveals that two out of the six objects are lenticular galaxies. The others are
spirals showing emission lines in their spectra through which we could classify
them as a starburst galaxy (the spiral member of the IRAS 02443+4437 close
pair), a Seyfert 2, a LINER and a weak H II galaxy. Since the S0/Sa is the
prevailing morphology for the galaxies of this group, which is also
characterized by a short crossing time and a relatively high velocity
dispersion, we suggest that CG J0247+44.9 is a dynamically old compact group.Comment: 17 pages, 5 figures out of which 4 are in jpg format. A postscript
version of the paper including all figures is available at:
http://astro.uibk.ac.at/~giovanna/preprints/Temporins.ps.gz Accepted for
publication in Astronomy and Astrophysic
Examining Autoexposure for Challenging Scenes
Autoexposure (AE) is a critical step applied by camera systems to ensure
properly exposed images. While current AE algorithms are effective in well-lit
environments with constant illumination, these algorithms still struggle in
environments with bright light sources or scenes with abrupt changes in
lighting. A significant hurdle in developing new AE algorithms for challenging
environments, especially those with time-varying lighting, is the lack of
suitable image datasets. To address this issue, we have captured a new 4D
exposure dataset that provides a large solution space (i.e., shutter speed
range from (1/500 to 15 seconds) over a temporal sequence with moving objects,
bright lights, and varying lighting. In addition, we have designed a software
platform to allow AE algorithms to be used in a plug-and-play manner with the
dataset. Our dataset and associate platform enable repeatable evaluation of
different AE algorithms and provide a much-needed starting point to develop
better AE methods. We examine several existing AE strategies using our dataset
and show that most users prefer a simple saliency method for challenging
lighting conditions.Comment: ICCV 202
Microscope 2.0: An Augmented Reality Microscope with Real-time Artificial Intelligence Integration
The brightfield microscope is instrumental in the visual examination of both
biological and physical samples at sub-millimeter scales. One key clinical
application has been in cancer histopathology, where the microscopic assessment
of the tissue samples is used for the diagnosis and staging of cancer and thus
guides clinical therapy. However, the interpretation of these samples is
inherently subjective, resulting in significant diagnostic variability.
Moreover, in many regions of the world, access to pathologists is severely
limited due to lack of trained personnel. In this regard, Artificial
Intelligence (AI) based tools promise to improve the access and quality of
healthcare. However, despite significant advances in AI research, integration
of these tools into real-world cancer diagnosis workflows remains challenging
because of the costs of image digitization and difficulties in deploying AI
solutions. Here we propose a cost-effective solution to the integration of AI:
the Augmented Reality Microscope (ARM). The ARM overlays AI-based information
onto the current view of the sample through the optical pathway in real-time,
enabling seamless integration of AI into the regular microscopy workflow. We
demonstrate the utility of ARM in the detection of lymph node metastases in
breast cancer and the identification of prostate cancer with a latency that
supports real-time workflows. We anticipate that ARM will remove barriers
towards the use of AI in microscopic analysis and thus improve the accuracy and
efficiency of cancer diagnosis. This approach is applicable to other microscopy
tasks and AI algorithms in the life sciences and beyond
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