Objective evaluation criteria for stereo camera shooting quality under different shooting parameters and shooting distances

The vigorous development of 3D technology has improved the photography technology of stereo cameras constantly. However, there are no widely recognized objective evaluation criteria for stereo camera shooting quality under different shooting parameters and shooting distances. At the same time, no shooting guideline can be used for reference when people take stereoscopic images. To solve this problem, we propose the objective evaluation criteria of shooting quality of two types of stereo cameras (parallel and toed-in camera configurations) under three shooting conditions (macro shooting, short, and long distance shooting). In our work, several prominent evaluation factors are built by analyzing the characteristics of each shooting condition. Based on the effective five-point scale used in our subjective experiments, the relationships between shooting factors and shooting quality are obtained and then effectively integrated together to build the overall evaluation criteria. Finally, extensive experiments have been conducted, and the results demonstrate that the proposed approach can effectively evaluate the shooting quality of stereo cameras

Stereoscopic image quality assessment method based on binocular combination saliency model

The objective quality assessment of stereoscopic images plays an important role in three-dimensional (3D) technologies. In this paper, we propose an effective method to evaluate the quality of stereoscopic images that are afflicted by symmetric distortions. The major technical contribution of this paper is that the binocular combination behaviours and human 3D visual saliency characteristics are both considered. In particular, a new 3D saliency map is developed, which not only greatly reduces the computational complexity by avoiding calculation of the depth information, but also assigns appropriate weights to the image contents. Experimental results indicate that the proposed metric not only significantly outperforms conventional 2D quality metrics, but also achieves higher performance than the existing 3D quality assessment models

How Can the European Federation for Colposcopy Promote High Quality Colposcopy Throughout Europe?

Since its inception in 1998, the European Federation for Colposcopy (EFC) now comprises 26 member societies. Its principle aim is to promote high quality colposcopy throughout Europe with special emphasis on training, education and treatment. This review summarises EFC’s activities and achievements to date

International Collaboration Patterns and Effecting Factors of Emerging Technologies

<div><p>With the globalization of the world economy, international innovation collaboration has taken place all over the world. This study selects three emerging technologies (3D printing, big data and carbon nanotubes and graphene technology) among 20 countries as the research objects, using three patent-based indicators and network relationship analysis to reflect international collaboration patterns. Then we integrate empirical analyses to show effecting factors of international collaboration degrees by using panel data. The results indicate that while 3D printing technology is associated with a “balanced collaboration” mode, big data technology is more accurately described by a radial pattern, centered on the United States, and carbon nanotubes and graphene technology exhibits “small-world” characteristics in this respect. It also shows that the factors GDP per capita (GPC), R&D expenditure (RDE) and the export of global trade value (ETV) negatively affect the level of international collaboration. It could be useful for China and other developing countries to make international scientific and technological collaboration strategies and policies in the future.</p></div

Cumulative distribution of the number of participants for each cluster after 200 time steps, , , and .

<p>This curve decays more and more rapidly in the double logarithmic coordinates. This distribution coincides with the Tianya BBS in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0050912#pone-0050912-g002" target="_blank">Fig. 2</a>.</p

Gini coefficient for the distribution of participants in each topic cluster and in each post as a function of time in Tianya BBS.

<p>The two Gini coefficients increase quickly in the early stage. However, the Gini coefficient for posts' participants eventually tends to become relatively stable, while the Gini coefficient for clusters' participants may decrease markedly.</p

Indicator analysis of 20 countries.

<p>Indicator analysis of 20 countries.</p

The network relationship of big data technology (drawn by netdraw software).

<p>The network relationship of big data technology (drawn by netdraw software).</p

Distribution of the number of users' topic interests in Tianya BBS.

<p>The double logarithmic curve shows a power-law property, with the power exponent of . Most users concentrate on less than 10 topics, and none of users have more than 200 topic interests.</p

Total number of replies for each user as a function of the number of user's topic interest.

<p>Some users that are interested in many topics usually create several replies for each topic and never join in further discussions. On the contrary, some users concentrating on only a few topics might debate with others and publish many replies to support their own opinions. The most active user that publishes about 1500 replies is only interested in 6 topics.</p