The problem of motion detection has received considerable attention due to the explosive growth of its applications in video analysis and surveillance systems. While the previous approaches can... Show moreThe problem of motion detection has received considerable attention due to the explosive growth of its applications in video analysis and surveillance systems. While the previous approaches can produce good results, the accurate detection of motion remains a challenging task due to the difficulties raised by illumination variations, occlusion, camouflage, sudden motions appearing in burst, dynamic texture, and environmental changes such as weather conditions, sunlight changes during a day, and so on. In this paper, a novel per-pixel motion descriptor is proposed for motion detection in video sequences which outperforms the current methods in the literature particularly in severe scenarios. The proposed descriptor is based on two complementary three-dimensional discrete wavelet transforms (3D-DWT) and a 3D wavelet leader. In this approach, a feature vector is extracted for each pixel by applying a novel 3D wavelet-based motion descriptor. Then, the extracted features are clustered by the well-known K-means algorithm. The experimental results demonstrate the effectiveness of the proposed method compared to the state-of-the-art approaches in several public benchmark datasets. The application of the proposed method and additional experimental results for several challenging datasets are available online. Show less
Drawing from the literature on behavioral spillover effects, the work-home resources model and research on helping at work, we investigate how help provision at work spills over to influence the... Show moreDrawing from the literature on behavioral spillover effects, the work-home resources model and research on helping at work, we investigate how help provision at work spills over to influence the provision of spousal support at home by examining a resource generation mechanism and a resource depletion mechanism. Across two experience-sampling studies, we collected data from employees and their spouses multiple times per day in different domains for ten workdays. Results from our two-study examination supported both the resource generation mechanism and the resource depletion mechanism. On days when employees helped colleagues more, they reported higher positive affect, which led to higher support provision to their spouses; meanwhile, higher levels of helping translated in less time for the family, which led to lower support provided to spouses. In Study 2, we tested and found that prosocial motivation enhanced the resource-generating effect of help provision. Theoretical and practical implications are discussed. Show less
Capuccini, B.; Lin, J.; Talavera-Lopez, C.; Khan, S.M.; Sodenkamp, J.; Spaccapelo, R.; Langhorne, J. 2016
This paper investigates three verbs expressing necessity in the three West Germanic languages: Dutch hoeven, English need, and German brauchen. These three verbs are all categorized as negative... Show moreThis paper investigates three verbs expressing necessity in the three West Germanic languages: Dutch hoeven, English need, and German brauchen. These three verbs are all categorized as negative polarity items (NPIs). However, there are differences in their distribution as NPIs, which posit German brauchen between English need and Dutch hoeven. By analyzing two factors that may influence acquisition, namely, opacity and input frequency, this paper moreover presents a similar pattern for the acquisition of these NPIs: The Dutch NPI hoeven emerges earlier in child language than its German counterpart, which in turn arises earlier than the English NPI need. Show less
