Then taking the complex conjugate of the second result and multiplying the Fourier transforms together elementwise, we obtain the Fourier transform of the correlogram, \ R:
12.
The focus position of any particular point on the surface of the specimen corresponds to the point of maximum fringe contrast ( i . e . where the modulation of the correlogram is greatest ).
13.
While a real correlogram may differ from the result in equation 4, the result clarifies the strong dependence of the correlogram on two parameters : the wavelength and the coherence length of the light source.
14.
While a real correlogram may differ from the result in equation 4, the result clarifies the strong dependence of the correlogram on two parameters : the wavelength and the coherence length of the light source.
15.
The representation formed by the detector is known as the correlogram, which showed two factors, the " spectral content " and the " time structure " of any particular sound transmitted for detection.
16.
Commonly, interpolation methods are used to estimate the peak location in the cross-correlogram to non-integer values, despite the fact that the data are discrete, and this procedure is often termed'subpixel registration '.
17.
Some methods shift the peak in Fourier space and apply non-linear optimization to maximize the correlogram peak, but these tend to be very slow since they must apply an inverse Fourier transform or its equivalent in the objective function.
18.
However, phase shifts at the object surface, inaccuracies of the positioning stage, dispersion differences between the arms of the interferometer, reflections from surfaces other than the object surface, and noise in the CCD can lead to a distorted correlogram.
19.
For example, in time series analysis, a correlogram, also known as an "'autocorrelation plot "', is a plot of the sample autocorrelations r _ h \, versus h \, ( the time lags ).
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