Influence of segmentation on deep iris recognition performance

Despite the rise of deep learning in numerous areas of computer vision and image processing, iris recognition has not benefited considerably from these trends so far. Most of the existing research on deep iris recognition is focused on new models for generating discriminative and robust iris representations and relies on methodologies akin to traditional iris recognition pipelines. Hence, the proposed models do not approach iris recognition in an end-to-end manner, but rather use standard heuristic iris segmentation (and unwrapping) techniques to produce normalized inputs for the deep learning models. However, because deep learning is able to model very complex data distributions and nonlinear data changes, an obvious question arises. How important is the use of traditional segmentation methods in a deep learning setting? To answer this question, we present in this paper an empirical analysis of the impact of iris segmentation on the performance of deep learning models using a simple two stage pipeline consisting of a segmentation and a recognition step. We evaluate how the accuracy of segmentation influences recognition performance but also examine if segmentation is needed at all. We use the CASIA Thousand and SBVPI datasets for the experiments and report several interesting findings.Comment: 6 pages, 3 figures, 3 tables, submitted to IWBF 201

Some Examples of Non-catalytic, Catalytic and Biocatalytic Preparations of Chiral Molecules

Practical solutions for the preparation of enantiomerically pure compounds (EPC) by enantioselective synthesis have now been found for most important organic reactions, and for a number of economically important classes of organic compounds. This author-review, therefore, covers only representative examples of those methods to which the author\u27s group made some contribution. Non-catalytic preparation of chiral molecules can be achieved either by separation of racemic mixtures, or by enantioselective synthesis using stoichiometric quantities of a chiral auxiliary agent. Examples of various separations of racemic 1,4-benzodiazepines will be given. Non-catalytic enantioselective preparation of specific a-amino acids and some therapeutically important compounds, will examplify the use of chiral auxiliaries, derived from the »chiral pooh of Nature. Biocatalytic transformations of chiral molecules that are not natural substrates of the enzymes, represent a rapidly growing field of application of enzymes and microorgasnisms in organic synthesis. Recently, we successfully used microbial lipases for enantioselective hydrolysis of some precursors of C3 and C4 chiral synthons, for kinetic resolution of rac 3-(2-nitrophe- noxy) butanoates, precursors for l,5-benzoxazepin-4(5H)-ones with ACH inhibitory activity, and also in chemoenzymatic syntehsis of S-fenpropimorph, the biologically active enantiomer of a commercially important fungicide. Complete stereoselectivity in the hydrolysis and acylation of resorcyclic acid macrocyclic lactones, intermediates in the production of a-zearanol, a commercially important growth-promoting agent, catalyzed by microbial lipases, prompted us to propose a new »helical model« for interaction of substrates with the Pseudomonas sp. lipase active site

THE MEDIA IN THE SERVICE OF HEALTH

The media are certainly in the service of health - following it with their information, advice, statistics, discoveries, innovations. There is a well-known saying that health is the greatest wealth. Being healthy and taking care of one\u27s health is a good thing. This article presents the media in the service of health and health care. The World Health Organization stresses that the media should cooperate with health services in promoting health. The introduction emphasizes the growing presence and availability of media in daily life, as well as its relevance in health education. In doing so, people of different ages, occupations and education are informed about health and advised about healthy living. The article goes on to discuss the importance of the media in the world. The media have various roles: information, education, instruction, and entertainment, but in doing so they must be ethical. The World Health Organization (WHO) defines health as a state of complete physical, mental, and social well-being and not merely the simple absence of disease or infirmity. The article then discusses the importance of health in our lives. The mass media reaches a great number of readers, listeners, and viewers each day with up-to-date and varied information, making them the most essential source of information regarding health and a healthy living. They transmit information from the sender (doctors, experts, and institutions) to the recipient - the people themselves. Health awareness strongly influences the care and treatment of individuals. There is talk of cooperation between the media and health care institutions in the function of improving people\u27s health. Physician-media communication was also analyzed, contributing to better information on health and the health system. The article provides valuable information and guidance concerning the relationship between health and the media. The article concludes with a discussion of the media during the COVID-19 pandemic. Research is cited showing that demand for media content increased during the pandemic. The media has a critical role to play in alerting the public about the pandemic, the disease\u27s progress, and how to battle COVID-19. Unfortunately, the media has had a harmful influence on human health, particularly the propagation of fear, panic, and excitement, as well as cardiac and mental illnesses. The media inundates the public with varied facts on the proliferation of COVID-19 in Croatia and throughout the world with daily news broadcasts

Sustav za simboličko računanje u Haskellu

Cilj diplomskog rada bio je implementirati sustav za simbolicko računanje (CAS) u programskom jeziku Haskell. Iz perspektive CAS-a, ova implementacija ima osnovnu funkcionalnost pojednostavljivanja izraza, te dodatnu funkcionalnost rješavanja sustava linearnih jednadžbi. Iskoristili smo Haskellov način definiranja tipova (Algebraic data types) kako bismo jednostavno implementirali osnovni tip T (term). Zbog visoke razine apstrakcije koju Haskell pruža, omogućeno nam je lako definiranje funkcija poput tmap ili tFoldMap (analogije Haskell funkcija fmap i foldMap, samo nad termima). Preko takvih funkcija prirodno se mogu opisati korisne funkcije i upiti nad termom. Funkcije poput djelovanja nekom funkcijom na svaki čvor terma, ili ispitivanja postojanja čvora tipa Add dvije razine ispod korijena terma. Osim funkcionalnosti vezanih za CAS, kod se sastoji od funkcija koje služe kao definicije za teorijski dio rada. Sva svojstva koja se koriste u definicijama i dokazima teorema, a moguće ih je opisati u Haskell kodu, implementirana su unutar koda. Prednost takvog pristupa je uvid u korektnu definiciju pojedinog svojstva. Za to smo iskoristili Haskellov jezični prevoditelj. Na primjer, svojstvo isNormalFor, koje prima term i vraća Bool vrijednost, se koristi kao dio definicije nekih drugih, složenijih svojstava. Ako u nekom trenutku odlučimo promijeniti tip tog svojstva tako da prima dva terma, jezični prevoditelj nam ne dopušta da napravimo grešku prilikom takve izmjene a da pritom korektno ne izmijenimo primjenu tog svojstva na svakom drugom mjestu gdje se ono pojavljuje. Svojstva koja je moguće definirati u kodu, su dosta ograničena zbog nemogućnosti opisa univerzalnog kvantifikatora nad beskonačnim skupovima, međutim takva mana se ublažava dodavanjem sustava za testiranje (QuickCheck)Goal of this graduate thesis was implementation of computer algebra system (CAS) in Haskell programming language. From CAS point of view, this implementation contains basic functionality for term simplification, and extra functionality for solving systems of linear equations. We used Haskell’s way of defining data types (Algebraic data types) so we could simply implement our main data type T (term). Because of high level of abstraction, which Haskell enables, we can define functions like tmap or tFoldMap (analogies of Haskell’s fmap and foldMap, but on data type T). With such functions we can naturally describe useful functions and queries on the T data type. Functions like applying some function on each node of a given term, or querying the existence of a Add-type node two levels below the root. Beside the functionality for CAS, code contains functions which serve as definitions for theoretical part of the thesis. All properties which are used in definitions and theorem proofs, and are possible to define in Haskell, are defined in the code. Advantage of such approach is insight in correct property definition. We used Haskell’s compiler for such purpose. For example, isNormal property of type T $\to$ Bool, is used as part of some other, more complex properties. If we decide to change the type of this property to T $\to$ T $\to$ Bool, compiler won’t let us do that unless we accordingly updated all other properties which depend on it. Properties defined in code are quite limited because there is no way to define universal quantification over infinite sets, but we handle this flaw by implementing tests for such properties with QuickCheck