视野深度是很多微小水珠拍摄的关键，中心区域清晰，外缘平滑模糊。
Depth of field is a key aspect of many droplet shots, with a clear central area and a hazy smooth outer edge to the shot.
研究了改进的基于特征子空间的平滑算法，加深了零陷深度，提高了系统的信噪比。
The improved smooth algorithm based on the characteristic sub-space used deepen the null to fall the depth, enhanced the system's signal to noise ratio.
采用DMO、偏移速度场平滑、叠前深度偏移等技术提高偏移成像精度。
For enhancing the migrated imaging, these techniques, like DMO, migration velocity field smoothing and pre-stack depth migration, are used.
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