Feature Extraction

Feature Extraction

Anindita Das Bhattacharjee (Swami Vivekananda Institute of Science and Technology, India)
Copyright: © 2017 |Pages: 58
DOI: 10.4018/978-1-5225-0498-6.ch003
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Accessibility problem is relevant for audiovisual information, where enormous data has to be explored and processed. Most of the solutions for this specific type of problems point towards a regular need of extracting applicable information features for a given content domain. And feature extraction process deals with two complicated tasks first deciding and then extracting. There are certain properties expected from good features-Repeatability, Distinctiveness, Locality, Quantity, Accuracy, Efficiency, and Invariance. Different feature extraction techniques are described. The chapter concentrates of taking a survey on the topic of Feature extraction and Image formation. Here both image and video are considered to have their feature extracted. In machine learning, pattern recognition and in image processing has significant contribution. The feature extraction is one of the common mechanisms involved in these two techniques. Extracting feature initiates from an initial data set of measured data and constructs derived informative values which are non redundant in nature.
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Extracting, analyzing, and understanding large scientific and non-scientific database of image available manually is very complex and tedious task for human brain. This type of knowledge discovery tasks are also contains some very decisive computational activities, hence always there is a requirement of automated activities that can be operated better than human brain by computers. But externally knowledge and experience input are provided to get improvised algorithms that can be used for any critical data analysis and extraction processes. This extraction process on image and video assists us to solve some high-level critical problems such as face and image recognition, medical and biological imaging, knowledge discovery, and so on. Also feature extraction minimizes and simplifies resource requirements, and describes large set of data accurately. Hence if we expect to achieve robust, adaptive and real time processing in multimedia application, then it is oblivious to use feature extraction mechanism. Very popular application of feature extraction involves image feature extraction with very useful mechanism to extract features are Average RGB, Color moments, Local color histogram and so on. These techniques focus simply in extracting feature from test image given. There are many types of features present in an image and a video which can be exploited and extracted to understand the image and video segment. This procedure is followed either simplification of media that is images or videos or to extract only important parts of it. For instance, features of a video stream upon extracting and exploiting redundant and relatively unwanted clips of that video can be avoided to present the shorter version with only relatively necessary information of the given video. Videos are considered as sequential frames or simply sequence of images. In case of image formation real values are processed and fed into the calculations to make up and image of the representing real object. There are some specific features associated with image and video stream. The point is to extract those features and on exploiting them the properties of the image can be understood and later the image can be recreated back when needed. Videos also can be recreated if their features are extracted. Apparently extracted features of videos will be dynamic and different than images. Since computers are computationally robust it can extract feature from video and images and with that it is possible to detect objects at a significant rate of success. There are several features and their extraction procedures are available a survey of those procedure is stated below.

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