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This paper presents a quality-scalable multiple description coding method for the H.264/AVC for error-resilient video transmission in wireless ad-hoc networks. In the proposed system, each video frame is divided into two regions according to the motion activities in the scene and the more important region is encoded into two independently decodable and equally important descriptions. The two descriptions...
We propose a textile indexing system which can classify textile images based on human emotions. The emotions can be regarded as emotional reactions of human beings when they view specific textile images. The evaluation system starts with extracting features of textile images such as colors, texture and patterns using various image processing techniques. The proposed system utilizes both fuzzy rules...
We study 3D retinal surface reconstruction by using an affine camera due to two following reasons: (1) NIH’s retinal imaging protocols specify a narrow field of view and (2) each retinal image has small depth variation. Specifically, we incorporate the prior knowledge of human retina geometry in the reconstruction process, and introduce a point-based approach to estimate the retinal spherical surface...
The diffusion weighted image (DWI) technique is routinely used for diagnosis and treatment of early stroke due to its superior performance, especially when compared with conventional magnetic resonance image (MRI) for detection of acute ischemic stroke. Using DWI examination, this paper proposes an application of image processing in a computer-aided diagnosis system, which can effectively calculate...
To avoid the large scale of damage of fire occurred in the tunnel, it is necessary to have a system to minimize and to discover the incident fast. However it is impossible to keep the human observation of CCTV in tunnel for 24 hour. So if the fire and smoke detection system through image processing warn fire state, it can be very convenient, and it can be possible to minimize damage even when people...
Real world winds can be classified into two categories: natural winds and artificial winds. While previous researchers have focused on natural winds, we also need to simulate artificial winds, which may be generated by electric fans, air conditioners, human mouths, etc. In this paper, we present a mathematical model for artificial winds, and also present an efficient method for calculating the forces...
In this paper we present an approach to use prior knowledge in the particle filter framework for 3D tracking, i.e. estimating the state parameters such as joint angles of a 3D object. The probability of the object’s states, including correlations between the state parameters, is learned a priori from training samples. We introduce a framework that integrates this knowledge into the family of particle...
Very large-area multi-projector display systems have wide applications since they provide immersive environments. The brightness of projectors in a system is not identical due to the design and aging of the bulbs, and optical properties of the projectors. Therefore, it is imperative to coordinate the brightness level and characteristics of projectors in the system. This issue has been addressed by...
This paper presents VirtualQWERTY, an effective and powerful textual communication toolkit for virtual reality. The first key idea of this paper is that we exploit the text input mechanism on mobile phones. We present a widget whose user interface is similar to that of the keypad on a mobile phone. Each keypad is composed of several buttons that have several characters. The second key idea of this...
This paper presents a system that combines fixed stereo cameras with wide field of view (FOV) and high resolution active Pan/Tilt (PT) cameras into a networked platform. Designed for security applications, the purpose is to provide high resolution face images while covering a wide area. A custom PT unit allowing a fixed camera projection center was designed to hold the high resolution camera. Two...
Rational re-parameterizations of a polynomial curve that preserve the curve degree and [0,1] parameter domain are characterized by a single degree of freedom. The optimal re-parameterization in this family can be identified but the existing methods may exhibit too much residual parametric speed variation for motion control and other applications. In this paper, a new re-parameterization method to...
This paper presents a new method to construct C1 polynomial surface to the scattered data points. The given data points are triangulated into triangle networks, and a C1piecewise quadric interpolant patch is constructed at the adjacent region of each point. For the different cases of the number of adjacent points, two different algorithms are used for determining the patches, respectively. The surface...
This paper proposes a new algorithm that detects the top object in a stack of arbitrarily overlapped objects, using the fact that the boundary edges of an occluding surface are not disconnected by other edges. To determine whether a surface is an occluding one or occluded one, this paper represents the objects in an input image using the attributed relation graph where a node represents a surface...
This paper presents a new approach of recognizing a 3D object using a single camera, based on the extended convex hull of its silhouette. It aims at minimizing the DB size and simplifying the processes for matching and feature extraction. For this purpose, two concepts are introduced: extended convex hull and measurable region. Extended convex hull is consisted of convex curved edges as well as convex...
Despite simplicity of the Local binary patterns (LBP) or local edge patterns (LEP) for texture description, they do not always convey complex pattern information. Moreover they are susceptive to various image distortions. Hence we propose a new descriptor called Local Contrast Patterns(LCP), which encode the joint difference distribution of filter responses that can be effectively computed by the...
This paper presents a VR game platform built upon wireless sensor network (WSN). The WSN is composed of multiple beacons and a receiver. Each beacon transmits both an ultrasonic pulse and the RF message at the same time. Then, the receiver attached to a moving device uses the standard time difference of arrival technique to estimate its distance from each beacon. The estimated distances are passed...
We describe an efficient and effective feature extraction and selection method for identifying humans by their gait. A sequential set of 2D stick figures is extracted from gait silhouette data by determining the joint angles and body points, and it is used to represent the gait signature that is primitive data for extracting motion parameters. The motion parameters in the gait signatures are stride...
Shadows occurring in images often lead to undesirable results in computer vision. An inherent weakness of 3D reconstruction from image focus is that, they require the imaged scene to have significant textures. In many real-world applications, surfaces can be smooth and lacking in detectable texture. In such cases, Shape-form-Focus (SFF) generates inaccurate and sparse depth maps. For accurate calculation...
Edge detection plays an important role in image processing area. This paper presents an edge detection method based on bilateral filtering which achieves better performance than single Gaussian filtering. In this form of filtering, both spatial closeness and intensity similarity of pixels are considered in order to preserve important visual cues provided by edges and reduce the sharpness of transitions...
Smooth local coordinates have been proposed by Hiyoshi and Sugihara 2000 to improve the classical Sibson’s and Laplace coordinates. These smooth local coordinates are computed by integrating geometric quantities over weights in the power diagram. In this paper we describe how to efficiently implement the Voronoi based C2 local coordinates. The globally C2 interpolant that Hiyoshi...
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