离散余弦变换(DCT)编码在地震勘探数据压缩中的应用
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摘要
利用离散余弦变换和游程编码技术相结合进行地震数据体的压缩研究,指出该技术是一种有损压缩技术。对于不同的松散度、信噪比等的数据其压缩比是不同的。在压缩过程中对层间信息和高频成分有一定的损失,损失的程度与数据的压缩比有直接关系。压缩越大,则数据的损失就越严重,压缩比大到一定程度时,数据恢复后就改变了原有的特征,所以一定要取的适度,这与数据的波形误差与频谱形态有关。
Discrete cosine transform is combined with run length coding technique to compress seismic data. This technique will lose some information and the compression ratio will vary with incompact degree and SNR. So the layer information in the data with weak comparability and high frequency will be damaged to some extent in the compression and decompression. The larger the compression ratio, the more serious the loss of information. The compression ratio depends on not only waveform errors in seismic data but also frequency spectra.
Discrete cosine transform is combined with run length coding technique to compress seismic data. This technique will lose some information and the compression ratio will vary with incompact degree and SNR. So the layer information in the data with weak comparability and high frequency will be damaged to some extent in the compression and decompression. The larger the compression ratio, the more serious the loss of information. The compression ratio depends on not only waveform errors in seismic data but also frequency spectra.
引文
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[7]余品能.二维离散余弦变换的FFT及FPT混合算法[J].石油地球物理勘探,1994,29(4):468473.YUPin neng.FFTandFPThybridalgorithmfor2-Ddiscretecosinetransform[J].OilGeophysicalProspecting,1994,29(4):468473.
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