Fixation is considered as physiochemical process where cells or tissues are fixed chemically. Fixatives perform various functions such as prevention of autolysis and tissue putrefaction. Various fixative agents include formaldehyde, glutaraldehyde, osmium tetroxide, glyoxal, picric acid, and so on. A detailed search on PubMed, Google scholar, and Scopus database showed very few articles on "fixation" and "fixative." Keeping this fact in mind, a comprehensive review on fixation and fixatives was prepared. The main aim of this review is to make pathologists and laboratory technicians familiar with the basic aspects and different types of fixatives.
Abstract
Offline signature verification can be linked as a biometric classifier that categorizes a signature into two classes: genuine and forged. In this paper a contour matching algorithm is proposed that tracks the basic characteristic patterns in a sample signature and verifies it. It capitalizes on the geometrical properties of the signature and takes into account the inevitable intrapersonal variations for the user set A. The system is trained with 8 original signatures and given a test sample; verification is done by a triangle matching algorithm that validates a signature on the basis of the relative position of the critical points (minimum set of points which when provided can retrace any given signature model). Results verify the effectiveness of the proposed mechanism.
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