Feature extraction is the foundation of audio classification, while audio classification is a key of content based audio retrieval.
音频特征提取是音频分类的基础，而音频分类又是基于内容的音频检索的关键。
In this dissertation, the basic principles and key techniques in the Content-based animation image retrieval technology are researched and analyzed, especially the feature extraction technology.
本文对基于内容的图像检索技术原理和关键技术做了研究和分析，特别是对图像的特征提取技术做了深入研究。
Shape feature extraction and description are one of important research topics in content-based image retrieval.
形状特征提取和表示是基于内容图像检索的重要研究内容之一。
Feature extraction is the key of the content based watermarking algorithm. Feature can be extracted either in the space domain or in the frequence domain.
特征提取是基于内容的数字水印技术的关键，它可以在空域和变换域两个空间进行。
Introduces color feature extraction and matching algorithms in content-based image retrieval, such as weighted Euclidean-distance, weighted centre distance, histogram intersection algorithm, etc.
介绍了基于内容图像检索中多种颜色的特征提取和匹配算法，以及加权欧几里得距离、中心距的加权距离、直方图交集算法等。
Visional feature extraction, high dimensional indexing mechanism and relevance feedback are three important issues in content-based image retrieval.
低层视觉特征提取、高维数据索引机制和相关反馈方法是面向大规模图像库基于内容检索的三个关键问题。
Most of the current available content-based 3D model retrieval techniques mainly focus on feature extraction and similarity measurement, and seldom involve the proper design of 3D model databases.
目前，对基于内容的三维模型检索的研究主要集中在检索过程所涉及到的算法方面，而对三维模型库的设计研究较少。
Most of the current available content-based 3D model retrieval techniques mainly focus on feature extraction and similarity measurement, and seldom involve the proper design of 3D model databases.
目前，对基于内容的三维模型检索的研究主要集中在检索过程所涉及到的算法方面，而对三维模型库的设计研究较少。
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