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After the human is detected and extracted, we then track body parts of the human by using appearances of these parts as the features and using particle filters as the tracking kernel. In the particle filter, we adopt color histograms as the appearance features and use a specific histogram mapping to enhance the discriminability between different objects. To form a robust tracker that can distinguish target objects from background objects that have color distribution similar to those of target objects, we calculate the target similarity from both the target object model and the background model.

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Drag through a liquid , however, though similar to friction, is directly related to the speed of an object. The faster an object moves, the more drag force is applied to it, i.e.

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According to this argument, similar to one-dimensional two-phase flow, the vapor's drift velocity in multi-dimensional two-phase flow is supposed to be a function of the modified acceleration .

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To examine them is possible, after presenting box edgewise to the eyes, similar to binoculars.

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