The nearest neighbor (NN) approach is a powerful nonparametric technique for pattern classification tasks. In this paper, algorithms for prototype reduction, hierarchical prototype organization and fast NN search are ...
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We show that it is possible to derive block transforms from filters which are normally used for subband decomposition. The idea is to decompose blocks of finite length into frequency bands of equal support on a linear...
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We show that it is possible to derive block transforms from filters which are normally used for subband decomposition. The idea is to decompose blocks of finite length into frequency bands of equal support on a linear scale, such that each band is effectively represented by a single coefficient. As an example, we derive a block transform based on the Daub8 orthogonal wavelet filter pair. The uniform partitioning of the frequency domain leads to basis functions similar to those of the Discrete Cosine Transform (DCT). Hence, we compare the performance of some of these transforms in terms of their speed and quality versus bitrate to that of the DCT for still image compression using two different coding algorithms.
A prototype binary edge-extracting ('smart') custom image sensor array, 'Edge 1', was developed previously at the University of Brighton, Awcock. It was implemented in a 2 micron ES2 CMOS process and f...
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A prototype binary edge-extracting ('smart') custom image sensor array, 'Edge 1', was developed previously at the University of Brighton, Awcock. It was implemented in a 2 micron ES2 CMOS process and featured 72 I/O pins because of its total lack of on-chip support circuitry. Several detail changes were suggested by testing this prototype and many of these have been recently tested in a 1.5 micron ES2 CMOS re-implementation of this design, 'Edge 2'. The successful operation of the Edge 1 prototype has shown that general-purpose CMOS manufacturing processes such as that offered by ES2 are indeed a practical proposition for the integration of image sensing and processing.functions. The uniformity of the photo-sites produced has been very encouraging.
Cham and Clarke proposed three schemes which eliminate the need of transmitting DC coefficients by estimating them from the AC component in transform image coding. images thus generated however have inherent errors wh...
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Cham and Clarke proposed three schemes which eliminate the need of transmitting DC coefficients by estimating them from the AC component in transform image coding. images thus generated however have inherent errors which degraded the image visual quality. In this paper, we propose a new iteration method which estimates DC coefficients from the AC component and a small portion of DC coefficients. Experiments show that an image coded using the JPEG scheme can be represented using only 10% of its DC coefficients with no or only small visible degradation in image quality. As a result about 4% to 12% more bit reduction can be achieved than the original JPEG scheme.
In this paper, we describe a parallel hardware implementation of handwritten character recognition system with neural network classifier on wavefront array processor (WAP) architecture. The WAP architecture needs no g...
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The paper proposes a method for extracting slant characters from complicated background figures efficiently and rapidly. In this method, slant character candidates are extracted using the black pixel density features,...
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In this paper we present the idea of using customizable tools to develop systems to interpret telephone company drawings. These drawings are composed primarily of horizontal and vertical lines. By selecting the inters...
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A method to build up a parametric model of an object class has been described. The object deformations are 'learned' on a training set, which ensures that the model represents the whole geometry variability. F...
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A method to build up a parametric model of an object class has been described. The object deformations are 'learned' on a training set, which ensures that the model represents the whole geometry variability. Furthermore, it is possible to get a compact and regularized description by suppressing the meaningless modes. The model matching, which is on-line process in an industrial framework is limited, is simple and fast, while the modeling building, the off-line process, may time consuming. In this paper, the contributions of the model object and of its deformations in the radiography that superimposes all the structures are identified. Because of the superimposition, only a few characteristics of the projected model object are available in the radiography.
The problem of separating words in a handwritten line is made difficult by the presence of non-uniform spacing between words and between characters within a word. A central sub-problem in word separation is the estima...
In this paper we consider the problem of clustering line-segments into new ones. The clustering-hierarchy gives an answer to the question what original line segments are combined into larger ones. Such a clustering is...
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