National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Optical properties of historical paint pigments under near infrared (NIR) radiation
Blažek, Jan ; Zitová, Barbara ; Tichý, T. ; Vašutová, V.
The knowledge of paint pigments' optical characteristics enables the selection of an appropriate imaging methodology for non-invasice artwork investigation. i. e. optimising the visibility of preparatory layers using conventional photographic cameras modified for data acquisition in the near infrared wavelength range. This contribution deals with the limits of this simple method in the analysis of selected common pigments used in prepared canvas mock-ups with typical structure including ground layer and underdrawings of various compositions.
LED field in the matrix 8x8
Kuneš, Michal ; Blažek, Jan
The reserach report describes design and implementation issues of LED field with triangular matrix of diodes. LEDs with the narrowest bandwidth and with the largest homogeneity of emitted light cover the widest wavelength bandwidth overall (350 - 1000nm). The proposed equipment is dedicated to multispectral acquisition of paintings.
Detection of Copies Using Mathematical Processing of Images I: Theoretical Basis and Methodology
Blažek, Jan ; Hradilová, J. ; Zitová, Barbara ; Kamenický, Jan
We propose semi-automatic methods for registration and comparison digital images of fine art. Registration algorithm is based on estimation of perspective transformation parameters according to control points. Image comparison is based on statistical analysis of images, normalization of brightness and absolute deviation. Suitability of comparing algorithms is demonstrated on examples. As an output of comparing algorithms are used intelligible differential maps.

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