离焦

An optical system of measuring system is constituted by a illuminating system and a magnifying system. The illuminating system adopts a far center illuminating mode to make the illumination unified. The magnifying system all adopts object far center optics path to eliminate the error for out of focus. The objective is a plan and apochromat to make image clear. The operator adjusts focus with parameters provided by computer.

论文分析了纤维细度测量系统的光学系统：照明系统采用远心柯勒方式，实现物面的均匀照明；成象系统采用物方远心光路，减少离焦对纤维细度测量的影响；物镜采用平场消色差物镜，消除因为象差引起的图象变形和不清晰，为纤维细度的高精度测量奠定基础；在图象清晰度判别中采用计算机计算参数结合人工调整的方法，既保证结果的客观性，又使系统简化。

Two detectors are used both in conventional differential astigmatic device and the device given in this paper.

与差动像散离焦检测原理相同的是，二者都是采用双探测器进行测量。

In this paper, the differential astigmatic detection method for defocus measurement with one-way defocused detector is developed from the conventional differential astigmatic detection.

本文在传统差动像散检测方法基础上，给出一种基于单向离焦的差动像散检测方法。

And then the point spread function can be acquired through Abel reverse transform, according to the circular symmetry characteristic of the defocused image.

由于离焦造成的图像模糊是圆对称的，对线扩散函数进行阿贝尔逆变换就得到了点扩散函数。

In this paper the defocused point spread function can be assessed through knife-edge function curve, according to the circular symmetry of the defocused image.

指出了由于模型不能准确逼近实际的离焦点扩散函数而导致离焦模糊图像复原无法取得预期效果。

3D seismic migration algorithms of holding circular symmetry ;2. Assuming that the point spread function is circular symmetry and considering that the image is actually complex conjugate symmetry in frequency domain, authors establish a new cost function in frequency domain.

算法假设退化系统的点扩散函数具有圆对称性，并考虑图像的频域具有复共轭对称性，在频域里建立了新的优化判据；采用共轭梯度算法搜索判据，从而在有实际物理意义的区域中收敛于最优解；对光学成像系统常见的离焦、衍射模糊问题进行了仿真；用该算法实现了其退化图像的恢复，给出并分析了结果。

To recover blurred image but the PSF of the image was not known,using the method which according to homeomorphisms and the principle of homology continuity in high-dimensional space geometry.

为了在不精确知道图像的点扩展函数的情况下，去除图像的离焦模糊，提出了基于高维空间几何理论的图像复原算法。

The results show that the effects on the output laser wavefront of the FADW are mainly the beam deflexion and the beam divergence, the other high-level wavefront errors are very low.

结果表明，自由旋涡气动窗口对输出激光波前的影响主要是光束偏转和离焦，特别是气动窗口工作在设计状态时，其余低阶及高阶像差都比较小，能够满足实际需要。

The temperature has more influence on the optical system based on the analysis of the various factors effect on the defocus.

本文通过对影响离焦的各种因素的分析可知温度的变化对光学系统的影响最大。

Defocus is one of the most familiar reason inducing image degradation.

离焦是造成图像模糊的最常见原因之一。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。