MRF-based texture segmentation using wavelet decomposed images

In recent textured image segmentation, Bayesian approaches capitalizing on computational efficiency of multiresolution representations have received much attention. Most of the previous researches have been based on multiresolution stochastic models which use the Gaussian pyramid image decomposition. In this paper, motivated by nonredundant directional selectivity and highly discriminative nature of the wavelet representation, we present an unsupervised textured image segmentation algorithm based on a multiscale stochastic modeling over the wavelet decomposition of image. The model, using doubly stochastic Markov random fields, captures intrascale statistical dependencies over the wavelet decomposed image and intrascale and interscale dependencies over the corresponding multiresolution region image.     

Projection based method for segmentation of human face and its evaluation

We detect facial features and then circumscribe each facial feature with the smallest rectangle possible by using vertical and horizontal gray value projections of pixels. The result is evaluated with respect to the manually located enclosing rectangle on the images of a publicly available database.     

Segmentation of ultrasound images by using a hybrid neural network

A hybrid neural network is presented for the segmentation of ultrasound images.

Feature vectors are formed by the discrete cosine transform of pixel intensities in region of interest (ROI). The elements and the dimension of the feature vectors are determined by considering only two parameters: The amount of ignored coefficients, and the dimension of the ROI.

First-layer-nodes of the proposed hybrid network represent hyperspheres (HSs) in the feature space. Feature space is partitioned by intersecting these HSs to represent the distribution of classes. The locations and radii of the HSs are found by the genetic algorithms.

Restricted Coulomb energy (RCE) network, modified RCE network, multi-layer perceptron and the proposed hybrid neural network are examined comparatively for the segmentation of ultrasound images.     

3D model recognition and segmentation based on multi-feature fusion

Current methods focusing on 3D model recognition and segmentation have to some extent ignored the relationship between the high-level global single-point features and the low-level local geometric features of those models, resulting in poor recognition results. A multi-feature fusion approach which takes into consideration the aforementioned ignored relationship is proposed. First, a global single-point network is established to extract the global single-point features with high-level semantic recognition ability by increasing both the width of convolution kernel and the depth of the network. Second, an attentional fusion layer is constructed to learn the implicit relationship between global single-point features and local geometric features to fully explore the fine-grained geometric features that can better represent model categories. Finally, the global single-point features and fine-grained geometric features are further fused to achieve the complementation of advantages and enhance the feature richness. Experimental verification is carried out on the 3D model recognition datasets ModelNet40, ModelNet10 and segmentation datasets ShapeNet Parts, S3DIS, vKITTI, respectively, and comparison with current mainstream recognition algorithms shows that the proposed algorithm not only has higher recognition and segmentation accuracy, but also has stronger robustness.     

基于改进型脉冲耦合神经网络的图像分割方法

脉冲耦合神经网络（Pulse Coupled Neural Network，PCNN）具有良好的脉冲传播特性，在图像分割中得到了广泛应用。针对其需要人机交互通过实验确定其相关参数，实时性差等问题，改进了标准的PCNN模型，提出了一种基于改进型脉冲耦合神经网络的图像分割方法。仿真结果表明，该方法实时性好、自适应性强，分割出的目标轮廓清楚．细节更多。     

Segmentation and classification of mixed text/graphics/image documents

In this paper, a feature-based document analysis system is presented which utilizes domain knowledge to segment and classify mixed text/graphics/image documents. In our approach, we first perform a run-length smearing operation followed by the stripe merging procedure to segment the blocks embedded in a document. The classification task is then performed based on the domain knowledge induced from the primitives associated with each type of medium. Proper use of domain knowledge is proved to be effective in accelerating the segmentation speed and decreasing the classification error. The experimental study reveals the feasibility of the new technique in segmenting and classifying mixed text/graphics/image documents.     

一种基于迟滞编码的自动语音端点检测方法

端点检测在语音识别中占有十分重要的地位，端点检测的准确性将直接影响整十语音识别系统的性能。已往的自动端点检测方绝大多数都是利用帧平均能量EN，帧平均跨零数ZN，帧平均跨零积A和帧平均零比B等参敦来确定语音段的始点和终点。这些方法的缺点是难以设置对各次实验都合适的固定阈值，这给实际应用带来了很多不便。本文提出了一种基于迟滞编码的自动端点检测方法——在对语音信号进行迟滞编码的基础上，利用各杖的码字和来判斯语音段的起点和终点。该方法充分利用了噪声和信号的统计特性，克服了已往端点检测方法的不足。实验结果表明．该方法具有良好的性能。     

A Formal Model for Video Shot Segmentation and its Application via Animate Vision

The first step in a video indexing process is the segmentation of videos into meaningful parts called shots. In this paper we present a formal model of the video shot segmentation process. Starting from a mathematical characterization of the most common transition effects, a video segmentation algorithm capable to detect both abrupt and gradual transitions is proposed. The proposed algorithm is based on the computation of an arbitrary similarity measure between consecutive frames of a video. The algorithm has been tested adopting a similarity metric based on the Animate Vision theory and results have been reported.     

快速成型切片数据的优化算法研究

为了能够顺利地进行 STL模型切片轮廓数据的进一步处理 ,提出了对切片数据进行优化处理的算法 .对由于STL模型的缺陷造成切片之后的轮廓信息数据有大量的冗余数据 ,提出了一种冗余数据的滤除算法 ;针对切片轮廓的不封闭 ,给出了有效的修正算法 ;同时给出了对切片轮廓的内外边界进行自动识别的算法 .该算法高效简单 ,提高了后续的数据处理的效率和成型件的加工质量 ,改善了零件成型的加工性能