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Head-coupled perspective in computer games

Szkudlarek M., Pietruszka M.

Journal of Applied Computer Science

2013

Vol. 21, nr 2

165--179

This work presents the new method of interaction in computer application, especially ﬁrstand third-person player games. The new control technique called “Head-Aim” is based on Head-Coupled Perspective imagery method and can be used as an independent method of aiming in games as alternative to conventional targeting (with use of popular control devices like computer mouse or gamepad) or combined with them, extending their functionality and interaction realism. Proposed pointing method can also be used in non-game application to allow people control them even if they are unable to use regular control devices. Eﬀectiveness of Head-Aim technique was compared with convetional methods of aiming in specially designed game named “Facepace”. Promising results of these tests are presented. Also a robust, fast and computationally cheap method of head tracking is proposed. Presented algorithm combines background subtrakction and new color-based tracking method enabling tracking user’s head under various lightning conditions. Method allows Head-Coupled Perspective technique to be performed without latencies even with use of a low quality webcam and enables viewing scene in 3D (and use of presented Head Aim method) on every machine, without use of glasses or special devices.

High performance liquid chromatography of ellagic acid from the leaves of Rubus chamaemorus L

Krawczyk A., Thiem B., Szkudlarek M.

Chemia Analityczna

2003

Vol. 48, No. 6

891-899

Ellagic acid (EA) is an important compound of dietary food as an antioxidant and it has been reported to have beneficial effects on human health. Optimisation of sample preparation procedures and experimental conditions for the fast and simple determination of the free and the total EA content in cloudberry's (Rubus chamaemorus L.) leaves by means of high-performance liquid chromatography (HPLC) have been developed. For the first time the mixture of vitamin C and 5-tocopherol has been used to protect EA from the influence of oxygen and light and this combination of the two agents provided the best effect in comparison to other known antioxidants. The influence of time and temperature on EA yield in the hydrolysed sample has been also analysed. The HPLC conditions applied resulted in a satisfactory separation of EA standard solution as well as the studied sample. One determined high concentration of the free and the total EA amount in dried leaves of R. chamaemorus, 0.137 and 6.996 g on 100 g of dry mass.

Kwas elagowy (KE) jest ważnym składnikiem zdrowej żywności ze względu na jego korzystne działanie jako przeciwutleniacza na zdrowie człowieka. W pracy opisano zoptymalizowaną procedurą przygotowywania próbek oraz niektórych analitycznych warunków stosowanych w wysokosprawnej chromatografii cieczowej (HPLC) do szybkiego i prostego oznaczania wolnego i całkowitego KE w liściach maliny moroszki (Rubus chamaemorus L.). Z szeregu wybranych przeciwutleniaczy zastosowanych do ochrony KE przed działaniem światła i tlenu, mieszanina witaminy C i 5-tokoferolu, użyta po raz pierwszy, dała najlepszy efekt. Badano również wpływ czasu i temperatury na wydajność KE w hy-drolizowanych próbkach. Opisane w pracy warunki HPLC pozwoliły na dobre rozdzielenie składników standardowego roztworu KE, jak również badanych próbek. Oznaczono wysoką zawartość wolnego i całkowitego KE w liściach R. chamaemorus, odpowiednio 0.137 i 6.996 g na lOOg suchej masy.