Browsing by Subject "Binary codes"
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Item Open Access Binary morphological subband decomposition for image coding(IEEE, 1996) Gürcan, Metin Nafi; Gerek, Ömer Nezih; Çetin, A. EnisIn this paper a binary waveform coding method based on morphological subband decomposition coupled with embedded zero-tree and entropy coding is described. This method can be utilized in text compression or bit-plane coding of images. Binary morphological subband decomposition operations are carried out in the Gallois Field, resulting in a computationally efficient structure. Simulation studies are presented.Item Open Access Subband coding of binary textual images for document retrieval(IEEE, 1996) Gerek, Ömer N.; Çetin, A. Enis; Tevfik, A. H.Efficient compression of binary textual images is very important for applications such as document archiving and retrieval, digital libraries and facsimile. The basic property of a textual image is the repetitions of small character images and curves inside the document. Exploiting the redundancy of these repetitions is the key step in most of the coding algorithms. In this paper, we use a similar compression method in subband domain. Four different subband decomposition schemes are described and their performances on textual image compression algorithm is examined. Experimentally, it is found that the described methods accomplish high compression ratios and they are suitable for fast database access and keyword search.