1,255 research outputs found
Motion Invariance in Visual Environments
The puzzle of computer vision might find new challenging solutions when we
realize that most successful methods are working at image level, which is
remarkably more difficult than processing directly visual streams, just as
happens in nature. In this paper, we claim that their processing naturally
leads to formulate the motion invariance principle, which enables the
construction of a new theory of visual learning based on convolutional
features. The theory addresses a number of intriguing questions that arise in
natural vision, and offers a well-posed computational scheme for the discovery
of convolutional filters over the retina. They are driven by the Euler-Lagrange
differential equations derived from the principle of least cognitive action,
that parallels laws of mechanics. Unlike traditional convolutional networks,
which need massive supervision, the proposed theory offers a truly new scenario
in which feature learning takes place by unsupervised processing of video
signals. An experimental report of the theory is presented where we show that
features extracted under motion invariance yield an improvement that can be
assessed by measuring information-based indexes.Comment: arXiv admin note: substantial text overlap with arXiv:1801.0711
Some Observations on the Text of šayḫ Hāšim’s Fatḥ al-raḥmānī
The paper focuses on the text of šayḫ Hāšim’s Fatḥ al-raḥmānī, a famous work of the Arabic literature of Harär, analyzing its so far known manuscript tradition
Contemporary and Historical Muslim Scholars as Portrayed by the Ethiopian Islamic Press in the 1990’s
The article aims at giving some information about Ethiopian Muslim scholars of the past century, so to enhance our general knowledge of Ethiopian Islam, and, moreover, to contribute to a better prosopographical understanding of the Muslim presence in Ethiopia. In this endeavour, it explores the data scattered in Ethiopian Islamic periodical press, which flourished in that country after the fall of the Derg regime in 1991. In particular, the monthly magazine Bilal, which contains in almost every issue a biographical note devoted to some learned man of the recent past, is used to collect material on the scholars. Biographical articles in Amharic and Arabic which appeared in the magazine are summarized and commented upon
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