955 resultados para television cameras


Relevância:

60.00% 60.00%

Publicador:

Resumo:

We have designed and implemented a low-cost digital system using closed-circuit television cameras coupled to a digital acquisition system for the recording of in vivo behavioral data in rodents and for allowing observation and recording of more than 10 animals simultaneously at a reduced cost, as compared with commercially available solutions. This system has been validated using two experimental rodent models: one involving chemically induced seizures and one assessing appetite and feeding. We present observational results showing comparable or improved levels of accuracy and observer consistency between this new system and traditional methods in these experimental models, discuss advantages of the presented system over conventional analog systems and commercially available digital systems, and propose possible extensions to the system and applications to nonrodent studies.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

We have designed and implemented a low-cost digital system using closed-circuit television cameras coupled to a digital acquisition system for the recording of in vivo behavioral data in rodents and for allowing observation and recording of more than 10 animals simultaneously at a reduced cost, as compared with commercially available solutions. This system has been validated using two experimental rodent models: one involving chemically induced seizures and one assessing appetite and feeding. We present observational results showing comparable or improved levels of accuracy and observer consistency between this new system and traditional methods in these experimental models, discuss advantages of the presented system over conventional analog systems and commercially available digital systems, and propose possible extensions to the system and applications to non-rodent studies.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

General note: Title and date provided by Bettye Lane.

Relevância:

60.00% 60.00%

Publicador:

Resumo:

Inscriptions: Verso: [stamped] Credit must be given to Leinwand from Monkmeyer Press Photo Service]

Relevância:

60.00% 60.00%

Publicador:

Resumo:

Our aim is to estimate the perspective-effected geometric distortion of a scene from a video feed. In contrast to most related previous work, in this task we are constrained to use low-level spatiotemporally local motion features only. This particular challenge arises in many semiautomatic surveillance systems that alert a human operator to potential abnormalities in the scene. Low-level spatiotemporally local motion features are sparse (and thus require comparatively little storage space) and sufficiently powerful in the context of video abnormality detection to reduce the need for human intervention by more than 100-fold. This paper introduces three significant contributions. First, we describe a dense algorithm for perspective estimation, which uses motion features to estimate the perspective distortion at each image locus and then polls all such local estimates to arrive at the globally best estimate. Second, we also present an alternative coarse algorithm that subdivides the image frame into blocks and uses motion features to derive block-specific motion characteristics and constrain the relationships between these characteristics, with the perspective estimate emerging as a result of a global optimization scheme. Third, we report the results of an evaluation using nine large sets acquired using existing closed-circuit television cameras, not installed specifically for the purposes of this paper. Our findings demonstrate that both proposed methods are successful, their accuracy matching that of human labeling using complete visual data (by the constraints of the setup unavailable to our algorithms).

Relevância:

30.00% 30.00%

Publicador:

Resumo:

This thesis examined television current affairs interviewing to determine the influence of the cultural politics of Australian commercial and non-commercial networks. Marketplace pressures to rate highly was the major influence on commercial programs resulting in the use of shorter dramatic interviews, more celebrities, fewer politicians, hidden cameras and ambush interviews.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

The evolution of the television market is led by 3DTV technology, and this tendency can accelerate during the next years according to expert forecasts. However, 3DTV delivery by broadcast networks is not currently developed enough, and acts as a bottleneck for the complete deployment of the technology. Thus, increasing interest is dedicated to ste-reo 3DTV formats compatible with current HDTV video equipment and infrastructure, as they may greatly encourage 3D acceptance. In this paper, different subsampling schemes for HDTV compatible transmission of both progressive and interlaced stereo 3DTV are studied and compared. The frequency characteristics and preserved frequency content of each scheme are analyzed, and a simple interpolation filter is specially designed. Finally, the advantages and disadvantages of the different schemes and filters are evaluated through quality testing on several progressive and interlaced video sequences.