Industrial taxonomies have the potential to automate information retrieval, facilitate interoperability and, most importantly, improve decision making -decisions that must comply with existing government regulations and codes of practice. However, it is difficult to find those regulations and codes most relevant to a particular decision, even though they are now in digital form, and often avail...

We study recursive algorithm for computing DCT of lengths N = q 2m (m, q ∈ N, q is odd) due to C. W. Kok [16]. We show that this algorithm has the same multiplicative complexity as theoretically achievable by the prime factor decomposition, when m 6 2. We also show that C. W. Kok’s factorization allows a simple conversion to a scaled form. We analyze complexity of such a scaled factorization, a...

The application of the Finite Difference Time Domain technique, equipped with periodic boundary conditions, can lead to the fast full-wave characterization of negative refractive index (NRI) structures. Employing the so-called sine-cosine method, the guiding and radiating properties of the NRI transmission-line medium are determined. Surface wave effects are captured, while the operation of the...

This paper proposes a method of segmentation that segments lecture videomaterial into subtopics based on speech signals for creation of educational video contents. To represent subtopics of video segments, the text recognized by automatic speech recognition (ASR) from a lecture speech was converted into an index using independent component analysis (ICA) instead of conventional TFIDF. This rese...

Fourier Domain Scoring (FDS) has been shown to give a 60% improvement in precision over the existing vector space methods, but its index requires a large storage space. We propose a new Web text mining method using the discrete cosine transform (DCT) to extract useful information from text documents and to provide improved document ranking, without having to store excessive data. While the new ...

A novel approach to image-denoising based on the shapeadaptive DCT (SA-DCT) is presented. The anisotropic LPAICI technique is used in order to deÞne the shape of the transform’s support in a pointwise adaptive manner. It means that for each point in the image an adaptive estimation neighborhood is found. For each one of these neighborhoods a SADCT is performed. The thresholded SA-DCT coefÞcient...

We present a novel quality assessment index for stereoscopic images based on structure-texture decomposition. To be more specific, we decompose a stereoscopic image pair into its structure and texture components. Then, gradient magnitude similarity (GMS) and luminance-contrast similarity (LCS) indexes are used to measure the qualities of structure components and texture components, respectively...

Social (or folksonomic) tagging has become a very popular way to describe content within Web 2.0 websites. Unlike taxonomies, which overimpose a hierarchical categorisation of content, folksonomies enable end-users to freely create and choose the categories (in this case, tags) that best describe some content. However, as tags are informally defined, continually changing, and ungoverned, social...

In this paper radix-2 algorithms for computation of type-II discrete cosine transform (DCT) and discrete sine transform (DST) of length N = 2 (n ≥ 2) are presented. The DCT/DST can be computed from two DCT/DST sequences, each of length N/2. The odd-indexed output components of DCT/DST can be realized using simple recursive relations. The proposed algorithms require a reduced number of arithmeti...

This paper presents two digital watermarking schemes for embedding a grayscale watermark into color images. The first embeds the watermark directly into the spatial domain while the other embeds the watermark after converting to the DCT Domain. In both schemes, following the pixel modification, the watermark is redirected into the saturation component of the image. The original image is needed ...