散焦

Plane waves are absolutely stable against small modulations in self-defocusing media, the dark spatial solitons exist only in the form localized dark hole on the plane wave background.

在自散焦介质中，平面波的传播对小的调制扰动是绝对稳定的，暗空间孤子正是作为平面波背景上的一种局域暗迹而存在的。

A new method for depth from defocus images is proposed.

提出了一种基于散焦图像计算景物距离的新方法。

A new method for depth measurement based on defocus images was proposed.

提出了基于散焦图像深度测量的一种新方法。

A new method for depth measurement of mobile object based on defocus images was proposed.

提出了一种基于散焦图像移动目标深度测量的方法。

Firstly, The general methods of depth estimation as well as those based on defocus images are introduced in this paper.

首先本文介绍了一些计算机视觉中常用的深度估计方法以及基于散焦图像深度估计的各种方法。

Defocus control doesn't mean soft focus, it means background softness control.

"散焦控制并不意味着软聚焦，它意味着"背景疲软的控制。

With the variety of defocus radius and magnification of object image, the moved distance and velocity of the object can be obtained.

通过运动目标图像的散焦半径与图像大小的变化，可得到目标运动的距离与相对运动速度。

The estimation of moved distance of a object and velocity between the object and camera based on defocus image is proposed in this paper.

本文提出了基于散焦图像的运动目标移动距离和速度估计的方法。

We put it across that the sign of nonlinear refractiveindex changes under certain conditions if the high-order excited state contributessignificantly to the refractive index.The nonlinearity changes from self-defocusing to self-focusing if the refrangibility of the ground state is larger thanthat of the first excited state and smaller than that of the second excited state.

高阶激发态折射度贡献较大时，非线性折射率符号在一定条件下存在转化：如果基态折射度大于低阶激发态的折射度而小于高阶激发态折射度，材料发生自散焦—自聚焦转化；如果基态折射度小于低阶激发态折射度大于高解阶激发态折射度则发生自聚焦—自散焦转化。

The experiment was performed at the Asterix IV iodine laser with a prepulse 5 ns before the main pulse. Under optimum focusing conditions for main pulse and prepulse the X-ray laser beam splits into two beamlets along the target surface at its output end of the 2.5 cm long plasma column. The splitting was still observed when the prepulse alone was defocused.

实验发现在抽运激光主、预脉冲最佳聚焦条件下， X射线激光束在2.5 cm长的线状等离子体输出端沿靶面方向分裂成两束；在抽运预脉冲单独散焦条件下，仍然观察到这一分裂现象；但是当抽运主、预脉冲同时散焦时，这一分裂现象逐渐消失并获得了半宽度只有40 μm的非常窄的近场像。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。