Image manipulation, unwrapping of wrapped phase, calculation speed and precision are still the mainstream study direction due to amounts of speckle noise.

由于散斑图中随机噪声的存在，数字散斑中的图像处理、包裹相位的展开以及计算速度与精度的问题，仍是当前散斑研究的主流方向。

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Output tracking problems for non minimum phase system existed in many practical problem, such as aircraft flight controlling, spacecraft launching and flexible manipulation, are considered.

讨论了一类非最小相位系统的输出跟踪问题。非最小相位系统广泛存在于机器人柔性结构控制、飞机的飞行控制和航天器发射等实际问题中。

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