| 实时自动对焦的研究 |
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| 引用本文： | 郑玉珍,吴勇,倪旭翔. 实时自动对焦的研究[J]. 光电工程, 2004, 31(4): 64-66 |
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| 作者姓名： | 郑玉珍 吴勇 倪旭翔 |
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| 作者单位： | 浙江科技学院,浙江,杭州,310012;浙江大学,浙江,杭州,310027 |
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| 摘 要： | 提出一种自动对焦技术,其调焦评价函数棗图像的平面微分平方和能够反映图像高频分量的能量。用计算平面微分平方和的方法在空间域上计算相邻像素亮度差值的平方和,对应于在频率域上计算图像高频分量的能量和,此值越大,图像对焦越准确。用平面微分平方和计算一行图像(N个像素)的调焦评价函数时,计算时间仅为2 (N -1)个时钟周期。
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| 关 键 词： | 自动对焦 调焦评价函数 平面微分平方和 |
| 文章编号： | 1003-501X(2004)04-0064-03 |
| 收稿时间： | 2003-07-24 |
| 修稿时间： | 2003-07-24 |
Research on automatic focusing in real time |
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| ZHENG Yu-zhen,WU Yong,NI Xu-xiang. Research on automatic focusing in real time[J]. Opto-Electronic Engineering, 2004, 31(4): 64-66 |
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| Authors: | ZHENG Yu-zhen WU Yong NI Xu-xiang |
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| Affiliation: | ZHENG Yu-zhen1,WU Yong2,NI Xu-xiang2 |
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| Abstract: | An automatic focusing technique is proposed. Its focusing evaluation functionSquare Plane Sum Modulus Difference (SPSMD) of image can reflect the energy of image high-frequency component. Calculating quadratic sum of adjacent pixel brightness difference in spatial domain with calculation of SPSMD method corresponds to calculating energy sum of image high-frequency component in frequency domain. The larger this value is, the more accurate the image focusing will be. When focusing evaluation functions for N pixels in a line are calculated with SPSMD, its calculation time is only 2 (N-1) clock cycles. |
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| Keywords: | Automatic focusing Focusing evaluation function SPSMD |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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