A method is described for finding decision boundaries, approximated by piecewise linear segments, for classifying patterns in RN N >/= 2, using simulated annealing. It involves generation and placement of a set of hyperplanes (represented by strings) in the feature space that yields minimum misclassification. Theoretical analysis shows that as the size of the training data set approaches infinity, the boundary provided by the simulated annealing based classifier will approach ...
A methodology based on the concept of variable string length GA (VGA) is developed for determining automatically the number of hyperplanes for modeling the class boundaries in GA classifier. The genetic operators and fitness function are newly defined to take care of the variability in chromosome length. It is proved that the said method is able to arrive at the optimal number of misclassifications after sufficiently large number of iterations, ...
A technique using Hough transform is described for detection of homogeneous line segments directly from (i.e., without binarization of) gray level images. A definition of region in terms of these line segments, with constraints on its length and variance, is provided. The algorithm is able to extract gray regions irrespective of their shape and size. The effectiveness of the method is demonstrated on Indian Remote-sensing Satellite(IRS) images.
an algorithm consisting of a histogram equalization technique followed by further enhancement using s and pi membership functions is described to detect the small variation in grey levels of x-ray images. the effectiveness of the algorithm in identifying the different regional contours related to growth of normal bones is demonstrated. (author)
a method of image enhancement by computer using the fuzzy set theoretic approach is reported. the algorithm involves extraction of fuzzy properties corresponding to pixels and then successive application of fuzzy operator 'contrast intensification' on the property plane. system performance with different indexes of fuzziness is demonstrated for an english script input. (author)
Reports by Author
