The correctness of color vision is the essential problem in Lighting Technology, Human Computer Interaction and Computer Graphics. To answer the question about correctness of perception process the workings of the whole human vision system should be analyzed. The color information can be falsified in the perception process. In many cases it is useful for us but often does not allow obtaining information about true color in proper way. But what is really true: the measured color or our “real subjective” perception?
PL
Percepcja barw jest jednym z podstawowych problemów techniki świetlnej, grafiki komputerowej i komunikacji człowiek-komputer. Aby odpowiedzieć na pytanie o poprawność interpretacji wrażeń barwnych, cały proces widzenia musi zostać przeanalizowany. Informacja o barwie może być fałszowana w procesie percepcji, często jest to dla nas korzystne. Powstaje jednak pytanie: na ile jest to subiektywne, czy oko jest dobrym instrumentem oceny barw?
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The values of the biomechanical human eyeball model parameters reported in the literature are still being disputed. The primary motivation behind this work was to predict the material parameters of the cornea through numerical simulations and to assess the applicability of the ubiquitously accepted law of applanation tonometry – the Imbert–Fick equation. Methods: Numerical simulations of a few states of eyeball loading were run to determine the stroma material parameters. In the computations, the elasticity moduli of the material were related to the stress sign, instead of the orientation in space. Results: Stroma elasticity secant modulus E was predicted to be close to 0.3 MPa. The numerically simulated applanation tonometer readings for the cornea with the calibration dimensions were found to be lower by 11 mmHg then IOP = 48 mmHg. Conclusions: This discrepancy is the result of a strictly mechanical phenomenon taking place in the tensioned and simultaneously flattened corneal shell and is not related to the tonometer measuring accuracy. The observed deviation has not been amenable to any GAT corrections, contradicting the Imbert–Fick law. This means a new approach to the calculation of corrections for GAT readings is needed.
W artykule zaprezentowano istniejące algorytmy rozpoznawania osób na podstawie tęczówki oka oraz przedstawiono nowy algorytm ekstrakcji cech tęczówki. Algorytm wykorzystuje transformatę falkową do analizy obrazu. Kod tęczówki wyznaczony jest za pomocą współczynników falkowych na bazie słownika wedgletów.
EN
This paper present existing algorithms for personal identification based on iris pattern and propose a new algorithm for iris feature extraction. The algorithm is based on texture analysis using wavelet transform. Iris code is generated using representation of the wavelet coefficients based on the wedgelet dictionary.