From the early days of multimedia communication development, ITU-T has paid much attention to establishing standard systems. In this paper, the authors discuss the ITU-T recommendation H series and T series on audiogr...
详细信息
ISBN:
(纸本)0780329120
From the early days of multimedia communication development, ITU-T has paid much attention to establishing standard systems. In this paper, the authors discuss the ITU-T recommendation H series and T series on audiographic and audio-visual multimedia services along with the research work on multimedia communication which their research lab has been doing and their experience of participating in the research and discussion work on ITU-T standard files on image and multimedia communication which was held by the telecommunication department in order to establish China's own corresponding standards.
In the automation of arc welding with visual sensors, it is necessary to precisely detect the weld line. However, for large scale structures such as a steel tube transmission tower shown in the present study, it is no...
详细信息
In the automation of arc welding with visual sensors, it is necessary to precisely detect the weld line. However, for large scale structures such as a steel tube transmission tower shown in the present study, it is not easy to maintain reliability of the weld line detection. The proposed method utilizes two important features in the welding of large-scale structure. They are based on the use of CAD/CAM data and the torch control. The proposed method is applied to detect straight and arc weld lines in some practical images. The results are satisfactory and successful in precisely detecting weld lines and weld tacks.
A full-fledged visual Pattern image Coding system is developed. For high compression ratio, Uniform Patterns are merged by Quadtree merging. For high visual quality, a new set of 2 X 2 Edge Patterns are designed for n...
详细信息
ISBN:
(纸本)0819418587
A full-fledged visual Pattern image Coding system is developed. For high compression ratio, Uniform Patterns are merged by Quadtree merging. For high visual quality, a new set of 2 X 2 Edge Patterns are designed for near perfect reconstruction. By a classification scheme of 11 groups or a threshold of gradient magnitude, the performance profile can adapt to a wide variety of applications.
imageprocessing operations are computational intensive and are usually solved by parallel algorithms implemented either on dedicated parallel computing devices or a network of workstations. With the increasing comput...
详细信息
ISBN:
(纸本)0819418587
imageprocessing operations are computational intensive and are usually solved by parallel algorithms implemented either on dedicated parallel computing devices or a network of workstations. With the increasing computing power of Personal Computer (PC) and better networking facilities, it is now feasible to perform distributive computing on a PC network. As the cost/performance ratio of PC is high, this provides a cost effective solution for solving imageprocessing problems. In this paper, we describe how to implement distributive imageprocessing algorithms on a peer-to-peer PC network under the WindowsNTTM operating system and the efficiency of such algorithms will be discussed.
A very common task in imageprocessing is the segmentation of the image in areas that are uniform in the sense of its features. Various applications can benefit even from partial segmentation, which is performed witho...
详细信息
ISBN:
(纸本)0819418587
A very common task in imageprocessing is the segmentation of the image in areas that are uniform in the sense of its features. Various applications can benefit even from partial segmentation, which is performed without need of physical of semantic knowledge. Several segmentation methods exist, but none that is applicable to all tasks. We use color and perceptual texture information to segment color images. Perceptual texture features are the features that can be qualified in simple descriptions by humans. Color information is represented in a perceptual way, using hue, value and saturation. These features' values are represented by histograms that integrates texture information around a small area. Segmentation and classification are obtained by comparing histograms of classes with the histograms of the area around the pixel being classified. We build a small application that uses remote sensing imagery and allows a user to interactively segment a Landsat TM-5 image using color and texture information. The steps and intermediate results of the classification are shown. The results are visually good, and the segmentation using color and texture information is more coherent than the using only color.
Statistical texture analysis has been commonly applied in the quantitative characterization of ultrasonic image. Recently, another approach begins to emerge, which uses fractal dimension. In this investigation, fracta...
详细信息
ISBN:
(纸本)0819418587
Statistical texture analysis has been commonly applied in the quantitative characterization of ultrasonic image. Recently, another approach begins to emerge, which uses fractal dimension. In this investigation, fractal dimension is estimated from histologically confirmed ultrasonic images using three different approaches: intensity- based, spectrum-based and reticular cell counting. The parameters are then used in image segmentation. The fractal model has the advantages that the parameter generated is stable over transformations of scale and linear transforms of intensity. From the results obtained, the performance of fractal dimension obtained by the reticular cell counting method is better than the other two approaches and comparable to the spatial grey level co-occurrence matrices statistic.
This paper proposes video coding control methods which greatly improve image quality for videoconference or videophone systems. The proposed methods utilize frame and block classifications to incorporate subjective ch...
详细信息
ISBN:
(纸本)0819418587
This paper proposes video coding control methods which greatly improve image quality for videoconference or videophone systems. The proposed methods utilize frame and block classifications to incorporate subjective characteristics. Frame classification makes it possible to tune quantization step sizes according to which is more important regarding each processing frame, motion smoothness or image clarity. Block classification is used to adjust encoding parameters according to whether the block belongs to background regions or not. combining the two proposed method, quantization step sizes are controlled to achieve high image quality according to scene and block contents. Moreover, without unnecessary bit consumption, coding distortion is reduced in uncovered background regions, which appear after moving objects.
In this paper, we provide a novel method based on higher order statistic cumulants to identify nonminimum-phase point spread functions and enlarges the possible distribution type of the image formation field. In our m...
详细信息
ISBN:
(纸本)0819418587
In this paper, we provide a novel method based on higher order statistic cumulants to identify nonminimum-phase point spread functions and enlarges the possible distribution type of the image formation field. In our method, we specify the blur identification problem as an ARMA model parameter identification problem, but we consider the image model as a realization of a colored signal instead of a normal zero-mean white Gaussian signal, which enlarges the range of image types. For the colored input ARMA model, the contributions of the bicepstrum of ARMA model are only along the axes and 45 degree(s) degree lines, so we extract the linear parts of cumulant of blur image to analysis, in which we use higher-order statistic techniques to estimate the ARMA parameters. The experiments are present in this paper.
A method for generating a sequence of synthetic images from two different image sequences is described. The method is composed of two major processes, i.e., an object tracking and an image synthesizing. The process of...
详细信息
ISBN:
(纸本)0819418587
A method for generating a sequence of synthetic images from two different image sequences is described. The method is composed of two major processes, i.e., an object tracking and an image synthesizing. The process of the object tracking consists of two phases. The first phase is to determine an initial contour which roughly approximates the shape of the object, and the second phase is to extract an accurate contour from the initial one by using an active contour model. An initial contour of an object in the first frame is specified manually, and those in the following frames are determined by referring the extracted contour in the previous frame. The contour extracted in the current frame is deformed by detecting nonrigid object movements and the resultant shape is used as the initial contour of the active contour model in the next frame. The motion parameters representing camera motions are also estimated by calculating optical flows between two successive frames.
The paper gives an overview on trends in mobile communications which is currently one of the most emerging markets. The demand for new and extended services is a driving force for the development of future mobile netw...
详细信息
ISBN:
(纸本)0819418587
The paper gives an overview on trends in mobile communications which is currently one of the most emerging markets. The demand for new and extended services is a driving force for the development of future mobile networks. Especially the provision of video communications is a great challenge. The current status of MPEG and ITU-T/SG15 concerning mobile communications is described and related to current projects. In the second part some aspects for the design of video codecs for mobile video telephony are outlined. Based on the coming standard H.26P and advanced video codec is described and its suitability for mobile networks is proven by some simulation results.
暂无评论