以对比度作为衡量图像聚焦程度的标准，研究了一种新颖的SAR图像自聚焦算法。
Considering the image contrast as a measurement of the degree of the image focus, a novel autofocus algorithm for Synthetic Aperture Radar (SAR) imagery is presented in this paper.
当抽运光与信号光的波长比取值为0.5 ~ 1.5时，信号光聚焦程度随着波长比的增大而有所降低。
When the wavelength ratio of the pump beam and the signal beam is 0.5 ~ 1.5, the focusing of the signal beam decreases with the rise of the ratio.
远视在某种程度上则相反，是较正常短些的眼球前后径或者太平坦的角膜使光线聚焦于视网膜后而不是之上，这导致近景视觉模糊和有时的远景视觉模糊;
Farsightedness is the opposite, in a way: A shorter-than-average eyeball or too-flat cornea focuses light behind the retina instead of on it, making near vision and sometimes distant vision blurry.
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