LITERATURE SURVEY OF AUTOMATIC FACE RECOGNITION ...

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The algorithm has three main purposes: (a) To remove impulse noise. CHAPTER XX HOW IT WORKS (b) To provide smoothing of other noise that may not be impulsive. (c) To reduce excessive distortions such as too much thinning or thickening of object boundaries. The steps are follows: Step 1 Initialization Start with the smallest windows size S = 3. Let the maximum window size be Smax (again, an odd number). Step 2 Computation of order statistic Let Zmin = S (0) ([Sk,l]) be the output of the 0th order statistic filter. Zmax = S(N)([wk,l]) is the output of the Nth order statistic filter and Zmed =S((N+1)/2) ([wk,l]) is the output of the median filter. Step 3 Evaluation of the terminating condition If the condition Zmin < Zmed < Zmax is satisfied then the processing ends with the computation of the output value which is defined as follows: If Zmin < Zxy < Zmax then the pixel is not corrupted by noise and the output value is the value of the original pixel, i.e. Zxy = Zxy. If Zmin < Zxy < Zmax is not satisfied then the output value is the median of the window, i.e. yuv = Zmed. If the condition is not satisfied then the computation continues. Step 4 Increasing of the window size 62
If the condition Zmin < Zmed < Zmax is not satisfies, it can be interpreted as follows. If many pixels have the same value then it is impossible to determine (with the current window size) whether the pixels are corrupted with high intensity noise or whether it is the constant area with all pixels of the same color. This is the reason why the window size has to be increased. If the window W is smaller than Smax, increase the size of the window, i.e. S = S + 2, and repeat the computation from step 2. If the size of the window W reaches the maximum value Smax, the processing ends and the output value is defined as Zxy = Zmed. The values Zmin and Zmax are considered statistically by the algorithm to be “impulselike” noise components, even if these are not the lowest or highest possible pixel values in the image. With these observations, we see that the purpose of level A is to determine if the median filter output, Zmed, is an impulse or not. If the condition Zmin
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LITERATURE SURVEY OF AUTOMATIC FACE
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ABSTRACT There are three fundamenta
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2.3.2 Processing Steps before Face
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LIST OF TABLES Table Page 5.2.1 The
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12.1. Functioning principle of the
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