ohh, ini sih maksudnya spectral whitening ngkali.... spectral whitening tentu saja bisa menghilangkan "geologic information"-nya. makanya dikatakan: ".... it is prudent to balance the wavelet amplitude without degrading the geologic information." jadi kalau balancing, yah jangan sampai degrading the geologic information-nya.
kenapa perlu whitening? ini kaitannya dgn wavelet overprint. kurang lebih maksudnya, efek wavelet sidelobe. semakin flat spektrum-nya, sidelobe waveletnya makin kecil dan mendekati spike. jadi karena efek sidelobe waveletnya makin kecil maka frequency slice hanya akan berisi informasi thin bed interference dan noise. mudah2an membantu. --pta On 3/14/07, attar kusuma <[EMAIL PROTECTED]> wrote:
makasih atas tanggapannya yang saya maksud sebenarnya spectral balancing dalam Specdecom. dalam papernya partyka dijelaskan: The tuning cube has three components: thin-bed interference, wavelet overprint, and noise (Figure 7). Since the geologic response is the most interesting component for the interpreter, it is prudent to balance the wavelet amplitude without degrading the geologic information. This reduces the tuning cube to thin-bed interference and noise. Common spectral balancing techniques rely on sparse invariant stationary statistics. If we assume that the geologic tuning varies considerably along any flattened horizon, then we balance the wavelet spectrum by equalizing each frequency slice according to its average amplitude (Figure 8). After whitening to minimize the wavelet effect, the tuning cube retains two main components: thin-bed interference and noise. In frequency-slice form, thin-bed interference appears as coherent amplitude variations. Random noise speckles the interference pattern in a similar fashion to poor quality television reception. At dominant frequencies, the relatively high signal-to-noise ratio (SNR) results in clear pictures of thin-bed tuning. Movement away from dominant frequency causes the SNR to degrade. At frequencies beyond usable bandwidth, the poor SNR results in a noise map. apakah mungkin spectral balancing tidak akan menghilangkan "informasi geologic-nya"? apa sih sebenarnya "wavelet overprint"?
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