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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。
By using the combination of discrete cosine transform and run-length coding, the compression of seismic data is studied, and it is pointed out that this technique is a lossy compression technique. For different degrees of looseness, SNR and other data compression ratio is different. There is a certain loss of information and high frequency components in the compression process, the degree of loss is directly related to the data compression ratio. The greater the compression, the more serious the loss of data. When the compression ratio is large enough, the original characteristics will be changed after the data is restored, so the moderateness must be taken, which is related to the waveform error of the data and the spectral shape.