Browsing by Subject "test IT8"

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Access status: Open Access ,
Badanie przestrzeni barwnej cyfrowego aparatu fotograficznego na przykładzie Minolty Dynax 5D
(Wydawnictwa AGH, 2006) Pirowski, Tomasz ; Tokarczyk, Regina
The proposed method of the automatism of the measurement of markers in a photo-grammetric system of 3D positioning for medical rehabilitation purposes is based on the detection of colours. Because the parameters of the calibration of colours determined based on one photo-graph are used in searching in many photographs, it is important to investigate how accurate in projecting colours a picture registering device (digital photo-camera) is. The studies referring to this phenomenon were carried out for the photo-camera Minolta Dynax 5D. A transparent test IT8 of known colour parameters in model $L*a*b$. was used in the studies. The experiments were made at day-light and artificial light, with different white balance and different speed of CCD. The results of the registration were compared in a formal and visual way with the pattern calculated into the space of colours RGB. Formal (statistic) approach allowed the detection of a difference on respective components R, G and B and defining standard deviation (noise) in single colour fields and the greyscale. In the conclusions it was stated which colours and which components get most deformed and in which range the colour balance for the greyscale is kept properly. To generalize - in order to compare different tests and - in the future - different digital cameras - a synthetic parameter was used - a so-called mean relative spectral error nQ - proposed by Wald.