Line spread function formulation proposed by W. H. Steel: a revision.
A revised formulation of the image light distribution of an incoherent line source proposed by Steel [Rev. Opt. 31, 334-340 (1952)] is presented. Analytical and numerical results based on this new representation are given. We explicitly show that a major error in Steel's final expression generates singularities, thereby preventing convenient numerical computation.
Retinal Image Denoising via Bilateral Filter with a Spatial Kernel of Optimally Oriented Line Spread Function
Filtering belongs to the most fundamental operations of retinal image processing and for which the value of the filtered image at a given location is a function of the values in a local window centered at this location. However, preserving thin retinal vessels during the filtering process is challenging due to vessels' small area and weak contrast compared to background, caused by the limited resolution of imaging and less blood flow in the vessel. In this paper, we present a novel retinal image denoising approach which is able to preserve the details of retinal vessels while effectively eliminating image noise. Specifically, our approach is carried out by determining an optimal spatial kernel for the bilateral filter, which is represented by a line spread function with an orientation and scale adjusted adaptively to the local vessel structure. Moreover, this approach can also be served as a preprocessing tool for improving the accuracy of the vessel detection technique. Experimental results show the superiority of our approach over state-of-the-art image denoising techniques such as the bilateral filter.
On Fascist Ideology
Fascism is a political ideology that encompassed totalitarianism, state terrorism, imperialism, racism and, in the German case, the most radical genocide of the last century: the Holocaust. Fascism, in its many forms did not hesitate to kill its own citizens as well as its colonial subjects in its search for ideological and political closure. Millions of civilians perished on a global scale during the apogee of fascist ideologies in Europe and beyond. In historical terms, fascism can be defined as a movement and a regime. Emilio Gentile – who, with Zeev Sternhell and George Mosse,2 is the most insightful historian of fascism – presents fascism as a modern revolutionary phenomenon that was nationalist and revolutionary, anti-liberal and anti-Marxist. Gentile also presents fascism as being typically organized in a militaristic party that had a totalitarian conception of state politics, an activist and antitheoretical ideology as well as a focus on virility and anti-hedonistic mythical foundations. For Gentile a defining feature of fascism was its character as a secular religion which affirms the primacy of the nation understood as an organic and ethnically homogenous community. Moreover, this nation was to be hierarchically organized in a corporativist state endowed with a war-mongering vocation that searches for a politics of national expansion, potency and conquest. Fascism, in short, was not a mere reactionary ideology. Rather, fascism aimed at creating a new order and a new civilization.3 The word fascism derives from the Italian word fascio and refers to a political group (such as the political group lead by Giuseppe Garibaldi during the time of Italian unification.) Fascism also refers visually and historically to a Roman imperial symbol of authority. Its place of birth as a modern political ideology was northern Italy, the year was 1919, and its founder was Benito Mussolini. Thus, fascism as a term as well as a political movement was born on the Italian peninsula. Its ideological origins, however, predated its name. The fact that fascism was born as a concept before its explicit birth as a movement is central to any understanding of fascism. The ideology of radical nationalism that made it possible was part of a larger intellectual reaction to the Enlightenment.4 This tradition was both European and, in the Latin American case, “non-European” as well. To be sure, the original ideology behind fascism was born as a reaction to the progressive European revolutions of the long nineteenth century (from the French revolution of 1789 to the American and Latin American revolutions of 1776 and the 1810s). Fascism represented a post-revolutionary attack against equality. The ideology of the anti-Enlightenment is the major root of the longstanding ideological tradition that created fascism. Its branches constituted a reaction against liberal politics and a rejection of democracy. And yet fascism did not oppose the market economy and put forward a corporatist organization that aimed to be functional to capitalist accumulation. Equally important, fascism is a philosophy of political action that ascribes value to absolute violence in the political realm. This ascription was boosted by one radical outcome of the