By Juan Zhang
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Extra resources for Digital Signal Processing: Fundamentals, Techniques and Applications
The magnitude of these signals is normalized and represents a demand big enough for impact negatively the power system. After performing the plane transformation of the current and voltage waveforms the average filter is applied. Then the non-active power is transformed into the harmonic current shown in Figure 11 (bottom). The resulting current waveform when the filter operates is shown in Figure 12. CONCLUSION This chapter has presented an introduction to the theory, design and implementation of average filters.
FIR filters can be designed and implemented according to the need, and because of their simplicity have found application on many fields including Real-Time systems. A special implementation of a low pass algorithm is the averaging filter. It calculates the output sample using the average from a finite number of input samples. The averaging filter is used in situations where is necessary to smooth data that carrying high frequency distortion. The main aim of this chapter is the exposition of the theory, implementation and application of the average filtering.
The closed-ups of the GVF field at the image edge and the smooth areas are given in Figures 2(h) and 2(i), respectively. Figures 2(c) and 2(d) show the evolution of the GVF active contour with two different initializations, respectively. It is seen that when an active contour is set to evolve onto the saddle points, it might be stuck there as shown in Figures 2(c). And when there exit stationary points between the active contour and the object boundary, it is also impossible for the active contour to move across the stationary points as shown in Figure 2(d).