The vocal repertoire of male Common Yellowthroats (Geothlypis trichas) includes a single distinctive perch song, a flight song, and several calls, including a chatter call. To ascertain the function of perch songs and chatter calls and to determine if these vocalizations are altered to convey different information, I examined the singing and calling behavior of male yellowthroats throughout the...

In recent years, various shadow detection methods from a single image have been proposed and used in vision systems; however, most of them are not appropriate for the robotic applications due to the expensive time complexity. This paper introduces a fast shadow detection method using a deep learning framework, with a time cost that is appropriate for robotic applications. In our solution, we fi...

Intelligent video surveillance systems detect pre-configured surveillance events through background modeling, foreground and object extraction, object tracking, and event detection. Shadow regions inside video frames sometimes appear as foreground objects, interfere with ensuing processes, and finally degrade the event detection performance of the systems. Conventional studies have mostly used ...

Shadow puppet play has been a popular traditional storytelling method for many centuries in many parts of Asia. This paper describes a method to model a virtual shadow puppet play using sophisticated computer graphics techniques available in Adobe Flash in order to allow interactive play in real-time environment as well as producing realistic animation. Areal-time method is proposed to produce ...

Shadow detection is critical for robust and reliable vision-based systems for traffic vision analysis. Shadow points are often misclassified as object points causing errors in localization, segmentation, tracking and classification of moving vehicles. This paper proposes a novel shadow elimination method SEBG for resolving shadow occlusion problems of vehicle analysis. Different from some tradi...

This paper describes a method for cast shadow removal from obliquely illuminated images of faces. The method draws on a statistical model of surface normal directions. The model is fitted to shadowed facial images using robust statistics and constraints provided by shape-from-shading. Regions associated with poor fit residuals are associated with shadow regions. We illustrate the method on the ...

A method of generating Deep Shadow Maps from a 3D data set is presented. This method uses ray tracing on the GPU to accumulate opacity and store them in a deep shadow map. The deep shadow map is then sampled based on view direction to determine how much light got to a particular fragment. The shadow maps can also be used to cast shadows onto other objects.

This paper introduces a novel approach to rendering of highquality shadows in real-time. The contemporary approach to shadow rendering in real-time is shadow maps algorithm. The standard shadow maps suffer from discretization and aliasing due to the limited resolution of the shadow texture. Moreover, omnidirectional lights need additional treatment to work correctly, e.g. with dual-paraboloid s...

This paper compares two methods for estimating illumination distributions from shadows: methods using self shadows and cast shadows. The cast shadow method provides an effective framework for recovering illuminations in a real scene utilizing variations of image brightnesses inside shadows cast by an occluding object of known shape. The shadow surface is typically the same plane on which the ob...