Andrej Mihálik

Andrej Mihálik
Comenius University Bratislava · Department of Applied Informatics

PhD

About

12
Publications
5,457
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27
Citations
Citations since 2016
6 Research Items
21 Citations
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468

Publications

Publications (12)
Chapter
In this article, we propose a methodology to measure the light reflectance of the material surface using a simple hardware set-up consisting of generally available mobile phones. The designed method incorporates two mobile phones to facilitate a time-consuming procedure. One device serves us as the light source and second one as the detector apertu...
Chapter
This paper discusses the method to display the surfaces that exhibit sparkling and depth effects. Sparkling effects are usually caused by the metallic flakes diffused in the paint or coating. The novelty of the approach is to explicitly model the sparkle normal vectors for rendering using an embedded device that allows us perceive depth effects in...
Article
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In photo-realistic image synthesis the incoming light from the environment is particularly important. In this work we focus on capturing the incoming light in the form of the radiance map using a common mobile device. This involves the reconstruction of the spherical panorama sky-dome in high dynamic range (HDR) quality and save it to a usable data...
Article
Full-text available
Accurate and fast identification of a person from a security point of view is a key procedure. The most common technique of person identification uses identity cards. In contrary to the common approach we focus our research on identification based on the body movement such as the gait in this paper. The gait and the posture belong to the unique cha...
Conference Paper
Full-text available
This work is focused on capturing the radiance map using a common mobile device. More specifically, we focus on a reconstruction of spherical panoramas sky-dome in high dynamic range (HDR) quality and save it to a usable data format. We have attached the cheap fish-eye lens to capture spherical panoramas and the proposed calibration technique, impl...
Article
Full-text available
Nowadays digital cameras with both high resolution and the high dynamic range (HDR) can be considered as parallel multiple sensors producing multiple measurements at once. In this paper we describe a technique for processing the captured HDR data and than fit them to theoretical surface reflection models in the form of bidirectional reflectance dis...
Article
Full-text available
To acquire a certain level of photorealism in computer graphics, it is necessary to analyze, how the materials scatter the incident light. In this work, we propose the method to direct rendering of isotropic bidirectional reflectance function (BRDF) from the small set of images. The image-based rendering is focused to synthesize as accurately as po...
Article
Full-text available
Humans recognize objects visually on the basis of material composition as well as shape. To acquire a certain level of photorealism, it is necessary to analyze, how the materials scatter the incident light. The key quantity for expressing the directional optical effect of materials on the incident radiance is the bidirectional reflectance distribut...
Article
Full-text available
This work describes an implementation of optical phenomena on water surfaces. Despite high perfor-mance of current graphics hardware, shaders need es-sential simplications and numerical approximation. Here we propose the implementation of common ef-fects such as reection, refraction and caustics. In order to have a simple and elegant implementation...
Article
Full-text available
Measurement of the appearance of an object consists of a group of measurements to characterize the color and surface finish of the object. This group of measurements involves the spectral energy distribution of propagated light measured in terms of reflectance and transmittance, and the spatial energy distribution of that light measured in terms of...
Article
Full-text available
In this work we propose a method that facilitates transport of a material appearance between objects depicted in two different images. The approach consists of two steps performed on both the material and original images, capturing the object material, and the object of interest itself. The diffuse and specular reflection components are separated b...

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