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| 图像调焦过程的清晰度评价函数研究 |
| Study on image definition evaluation function in auto focusing process |
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| DOI: |
| 中文关键词: 自动调焦 图像清晰度 调焦判定函数 调焦曲线 |
| 英文关键词:automatic focusing image definition focusing evaluation function focusing curves |
| 基金项目: |
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| 摘要点击次数: 4212 |
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| 中文摘要: |
| 自动调焦是一类建立在搜索算法上的调焦方法,它通过计算机编程对不同对焦位置所成像的清晰度进行评价,利用正确对焦时图像最清晰这个特征找到正确的对焦位置。判断图像对焦与否是通过图像清晰度对焦评价函数/调焦状态评价函数(调焦判定函数)来衡量的。利用每一个调焦判定函数对包含了一组模糊和清晰图像的序列图像进行处理,可以得到对应于相应判定函数的调焦曲线,利用曲线可以非常直观地分析判定函数的性能。结果表明,灰度梯度函数具有比较稳定的调焦特性。 |
| 英文摘要: |
| Auto focusing is a class of focusing methods based on the searching algorithm.It evaluates the image definition at different focusing position by computer programming.According to the focused image,we can get the focal position.Judging whether the image appears clearest is usually through the image definition focusing evaluation function or focusing state evaluation function (combined to be called focusing evaluation function).A group of blurred images and distinct images are processed by each focusing evaluation function to form a focusing curves.With those corresponding curves,the performance of the evaluation functions could be analyzed visually.The results indicated that all the gray gradient functions have better performance than that of others. |
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