| 摘要 |
Embodiments in accordance with the invention provide respectively for auto-focus, auto-contrast, and auto-correction of astigmatism in both x and y directions, are independent of focus-induced-image-rotation, sample feature orientation and image deformation, and focus-induced-image magnification change, and are insensitive to various kinds of noise. Poor image contrast is handled by an auto-contrast capability. Embodiments in accordance with the invention can achieve high reliability and repeatability, while providing for faster operation than most prior-art methods.
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