Generic Fourier descriptor for shape-based image retrieval
نویسندگان
چکیده
Shape description is one of the key parts of image content description in MPEG-7. Most of existing shape descriptors are usually either application dependent or non-robust, making them undesirable for generic shape description. In this paper, a generic Fourier descriptor (GFD) is proposed to overcome the drawbacks of existing shape representation techniques. The proposed shape descriptor is derived by applying 2-D Fourier transform on a polar raster sampled shape image. The acquired shape descriptor is application independent and robust. Experimental results show the GFD outperforms Zernike moment descriptor (ZMD) which has been proposed to MPEG-7 as shape descriptor.
منابع مشابه
Shape-based image retrieval using generic Fourier descriptor
Shape description is one of the key parts of image content description for image retrieval. Most of existing shape descriptors are usually either application dependent or non-robust, making them undesirable for generic shape description. In this paper, a generic Fourier descriptor (GFD) is proposed to overcome the drawbacks of existing shape representation techniques. The proposed shape descrip...
متن کاملEffective invariant features for shape-based image retrieval
relies critically on the ability to find effective image features to represent the database images. The shape of an object is a fundamental image feature and belongs to one of the most important image features used in CBIR. In this article we propose a robust and effective shape feature known as the compound image descriptor (CID), which combines the Fourier transform (FT) magnitude and phase c...
متن کاملContent-Based Image Retrieval Using Generic Fourier Descriptor and Gabor Filters
Content-based image retrieval (CBIR) is an important research area with applications to a large amount o f image databases and multimedia information. In CBIR, image is described by several low-level image features, such as color, texture, shape or their combination. The focus o f this paper is on the problem o f shape and texture feature extraction and representation for CBIR. Shape is one o f...
متن کاملA new shape retrieval method using the Group delay of the Fourier descriptors
In this paper, we introduced a new way to analyze the shape using a new Fourier based descriptor, which is the smoothed derivative of the phase of the Fourier descriptors. It is extracted from the complex boundary of the shape, and is called the smoothed group delay (SGD). The usage of SGD on the Fourier phase descriptors, allows a compact representation of the shape boundaries which is robust ...
متن کاملEvaluation of Shape Descriptors for Shape-Based Image Retrieval
This paper presents a comparative study between scale, rotation and translation invariant descriptors for shape representation and retrieval. Since shape is one of the most widely used image feature exploited in content-based image retrieval systems, we studied for each descriptor, the number of coefficients needed for indexing and their retrieval performance. Specifically, we studied Fourier, ...
متن کامل