97 research outputs found
Mask-guided Style Transfer Network for Purifying Real Images
Recently, the progress of learning-by-synthesis has proposed a training model
for synthetic images, which can effectively reduce the cost of human and
material resources. However, due to the different distribution of synthetic
images compared with real images, the desired performance cannot be achieved.
To solve this problem, the previous method learned a model to improve the
realism of the synthetic images. Different from the previous methods, this
paper try to purify real image by extracting discriminative and robust features
to convert outdoor real images to indoor synthetic images. In this paper, we
first introduce the segmentation masks to construct RGB-mask pairs as inputs,
then we design a mask-guided style transfer network to learn style features
separately from the attention and bkgd(background) regions and learn content
features from full and attention region. Moreover, we propose a novel
region-level task-guided loss to restrain the features learnt from style and
content. Experiments were performed using mixed studies (qualitative and
quantitative) methods to demonstrate the possibility of purifying real images
in complex directions. We evaluate the proposed method on various public
datasets, including LPW, COCO and MPIIGaze. Experimental results show that the
proposed method is effective and achieves the state-of-the-art results.Comment: arXiv admin note: substantial text overlap with arXiv:1903.0582
A Recording and Analysis System of Bioptic Driving Behaviors
Millions of visually impaired people do not drive because they fail to meet the general vision requirements. There is a legal option in 38 US states where people with moderate central vision loss (e.g. visual acuity better than 20/200) may be permitted to drive while wearing spectacle-mounted bioptic telescopes. However, the safety of bioptic driving is still highly controversial, because bioptic use in driving is not well understood. Whether and how bioptic telescopes are actually used in driving, how they should be used appropriately, and whether their use results in better or worse driving performance has never been scientifically established. We are developing an in-car camera system that can be installed in bioptic drivers’ own vehicles to record their daily driving activities over long periods of time. Videos of the driver and traffic, GPS coordinates, XYZ acceleration, and vehicle black box data are recorded. We are also developing computer-aided reviewing techniques to automatically identify the most informative driving segments from the vast amount of data and, reconstruct the selected driving maneuvers on an interactive interface, so that these representative segments can be assessed off-line by driver evaluation and training specialists
Efectos del cobre disuelto sobre la supervivencia, estado antioxidante, expresión de la metalotionina-I mRNA y la respuesta fisiológica de las larvas del cangrejo de Shangai, Eriocheir sinensis (Decapoda: Brachyura)
The lethal concentration of water-borne copper in Chinese mitten crab Eriocheir sinensis larvae was tested by exposing the animals to 0, 0.1, 0.2, 0.3, 0.5 and 0.8 mg Cu L-1 at 20°C for 96 h. The 96-h median lethal concentration (LC50) and its corresponding 95% confident interval was estimated on zoea 1 larvae and megalopa larvae, respectively. Acute dissolved copper toxicity was higher for zoea 1 larvae (0.16 mg L-1) than for megalopa larvae (0.21 mg L-1). The antioxidant status, metallothionein-I mRNA expression and physiological response of the crab to copper toxicity was further investigated by exposing the megalopa larvae to 0, 0.08 and 0.16 mg Cu L-1 for 96 h. The superoxide dismutase activity, catalase activity, glutathione S-transferase (GST) activity and lipid peroxidation content of megalopa larvae increased concomitantly with the exposure time and copper concentration. MT-I mRNA expression levels were positively correlated with both the concentration and duration of copper exposure. The oxygen consumption and respiratory quotient of megalopa larvae in response to 0.16 mg L-1 copper were significantly higher than those in the control group after 96 h of exposure (P < 0.05). The results of this study highlight the potential effects of copper as a common stressor in E. sinensis larvae. MT-I and GST appear to be suitable biomarkers of environmental copper exposure stress in E. sinensis larvaeLa concentración letal de cobre disuelto se determina mediante la exposición de larvas del cangrejo de Shangai (Eriocheir sinensis) a dosis de 0, 0.1, 0.2, 0.3, 0.5 y 0.8 mg Cu L–1, a 20°C durante 96 h. La concentración letal media (LC50) y su correspondiente intervalo de confianza del 95% fueron estimados en los estadios larvales zoea I y megalopa. La toxicidad aguda del cobre disuelto fue mayor sobre larvas de zoea I (0.16 mg L–1) que sobre las de megalopa (0.21 mg L–1). El estado antioxidante, la expresión del mRNA de la metalotionina–I y la respuesta fisiológica del cangrejo a la toxicidad del cobre fueron posteriormente investigados exponiendo las larvas de megalopa a dosis de 0, 0.08 y 0.16 mg Cu L–1 durante 96 h. La actividad de la superóxido dismutasa (SOD), de la catalasa (CAT), de la glutatión-S-transferasa (GST) y la peroxidación lipÃdica de las larvas de megalopa se incrementó en relación con el tiempo de exposición y la concentración de cobre. Los niveles de expresión de MT-1 mRNA se correlacionaron positivamente con la concentración de cobre y el tiempo de exposición.
El consumo de oxÃgeno y la tasa respiratoria de las larvas de megalopa fueron significativamente más elevadas que las del grupo control (P < 0.05) en respuesta a dosis de 0.16 mg Cu L–1, durante 96 h de exposición. Los resultados presentados en este estudio ponen de manifiesto los efectos potenciales del cobre como factor de estrés sobre las larvas de E. sinensis. MT-I y GST parecen ser adecuados biomarcadores de estrés a la exposición de Cu ambiental en larvas de E. sinensis
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