Magnifying absolute instruments for optically homogeneous regions

We propose a class of magnifying absolute optical instruments with a positive isotropic refractive index. They create magnified stigmatic images, either virtual or real, of optically homogeneous three-dimensional spatial regions within geometrical optics.Comment: 4 pages, 8 figure

Spectra of absolute instruments from the WKB approximation

We calculate frequency spectra of absolute optical instruments using the WKB approximation. The resulting eigenfrequencies approximate the actual values very accurately, in some cases they even give the exact values. Our calculations confirm results obtained previously by a completely different method. In particular, the eigenfrequencies of absolute instruments form tight groups that are almost equidistantly spaced. We demonstrate our method and its results on several examples

Dr TIM: Ray-tracer TIM, with additional specialist scientific capabilities

We describe several extensions to TIM, a raytracing program for ray-optics research. These include relativistic raytracing; simulation of the external appearance of Eaton lenses, Luneburg lenses and generalized focusing gradient-index (GGRIN) lenses, which are types of perfect imaging devices; raytracing through interfaces between spaces with different optical metrics; and refraction with generalised confocal lenslet arrays, which are particularly versatile METATOYs.Comment: 12 pages, 16 figure

Les conséquences du renversement de la charge de la preuve dans le contexte des arrêts de la Cour de justice de l’Union européenne - Asociaţia Accept (C-81/12) et Galina Meister (C-415/10)

The author of the article refers to two judgements of the Court of Justice of the European Union, which relate to the principle of the reversal of the burden of proof in anti-discrimination cases. She focuses on the facts, from which it may be presumed that there has been discrimination. It cannot be ruled out that a defendant’s refusal to grant any access to information may be one of the factors to take into account in the context of establishing facts from which it may be presumed that there has been direct or indirect discrimination (C-415/10). Public statements ruling out the recruitment of a footballer presented as being homosexual are considered to be “the facts from which it may be presumed that there has been discrimination, even though they come from a person presenting himself and being perceived in the media and among the general public as playing a leading role in that club without, however, necessarily having legal capacity to bind it or to represent it in recruitment matters (C-81/12).The author of the article refers to two judgements of the Court of Justice of the European Union, which relate to the principle of the reversal of the burden of proof in anti-discrimination cases. She focuses on the facts, from which it may be presumed that there has been discrimination. It cannot be ruled out that a defendant’s refusal to grant any access to information may be one of the factors to take into account in the context of establishing facts from which it may be presumed that there has been direct or indirect discrimination (C-415/10). Public statements ruling out the recruitment of a footballer presented as being homosexual are considered to be “the facts from which it may be presumed that there has been discrimination, even though they come from a personpresenting himself and being perceived in the media and among the general public as playing a leading role in that club without, however, necessarily having legal capacity to bind it or to represent it in recruitment matters (C-81/12)

Lane Detection Using Computer Vision

Autonomní řízení vozidel se v posledních letech stává zajímavým a stále více citovaným tématem. Vozidla vybavená takovým systémem musí umět za pomocí různých senzorů detekovat a rozpoznat celou řadu zájmových objektů na silnicích. Například protijedoucí vozidla, chodce, dopravní značky nebo jízdní pruhy. Cílem práce je vytvoření programu, který dokáže rozpoznat jízdní pruh a do obrázku nebo videa vykreslit oblast, která odpovídá tomuto jízdnímu pruhu.Autonomous car driving is recently becoming more interesting and more cited topic. Vehicles equiped with such system have to be able to detect and recognize various objects on the road by different sensors. For example oncomming traffic, pedestrians, traffic signs or traffic lanes. Goal of this work is to create a program, which is able to recognize traffic lane and draw an area into an image or a video accordingly to the traffic lane as accurately as possible.460 - Katedra informatikyvelmi dobř

Imaging with Pairs of Skew Lenses

Many of the properties of thick lenses can be understood by considering these as a combination of parallel ideal thin lenses that share a common optical axis. A similar analysis can also be applied to many other optical systems. Consequently, combinations of ideal lenses that share a common optical axis, or at least optical-axis direction, are very well understood. Such combinations can be described as a single lens with principal planes that do not coincide. However, in recent proposals for lens-based transformation-optics devices the lenses do not share an optical-axis direction. To understand such lens-based transformation-optics devices, combinations of lenses with skew optical axes must be understood. In complete analogy to the description of combinations of pairs of ideal lenses that share an optical axis, we describe here pairs of ideal lenses with skew optical axes as a single ideal lens with sheared object and image spaces. The transverse planes are no longer perpendicular to the optical axis. We construct the optical axis, the direction of the transverse planes on both sides, and all cardinal points. We believe that this construction has the potential to become a powerful tool for understanding and designing novel optical devices