| Hi3515平台上自动聚焦技术的研究与应用 |
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| 引用本文： | 郭建军,刘彦隆,赵福梅,高洁. Hi3515平台上自动聚焦技术的研究与应用[J]. 电视技术, 2012, 36(19) |
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| 作者姓名： | 郭建军 刘彦隆 赵福梅 高洁 |
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| 作者单位： | 太原理工大学通信与嵌入式实验室,山西太原,030024 |
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| 摘 要： | 鉴于视频展示台中自动聚焦技术的实现越发重要,因此主要讲述了如何在Hi3515平台上实现自动聚焦功能.使用4×4整数DCT变换作为图像清晰与否的评价标准,此算法具有良好的单调性和无偏性,而且具有稳定性和快速性.最后在此评价函数的基础上,使用单调性法和爬山法相结合的方法实现了快速、精确的聚焦.
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| 关 键 词： | Hi3515 4×4整数DCT 自动聚焦 聚焦策略 |
| 收稿时间： | 2012-05-03 |
| 修稿时间： | 2012-05-11 |
The research and application of auto-focus based on Hi3515 |
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| guojianjun,liuyanlong,zhaofumei and gaojie. The research and application of auto-focus based on Hi3515[J]. Ideo Engineering, 2012, 36(19) |
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| Authors: | guojianjun liuyanlong zhaofumei gaojie |
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| Affiliation: | TaiYuan University of Technology,TaiYuan University of Technology,TaiYuan University of Technology,TaiYuan university of science and technology |
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| Abstract: | Auto-focus is a key technology for visual presenter, this paper mainly presents how to achieve the function of auto-focus on Hi3515. The 4x4 integer DCT (Discrete Cosine Transform) is used to indicate whether the system is on accurate focus or not. Because the 4x4 integer DCT not only has the characteristics of single peak value, non-deflection, reliability, high-speed, but also has lower complex computation than the other frequency methods such as FFT(Fast Fourier Transform), DWT (Discrete Wavelet Transform). This paper employs the method of monotonic and blind hill climbing to achieve auto-focus. The result of auto-focus is shown as Fig. 6. |
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| Keywords: | Hi3515 4x4 integer DCT auto-focus focus strategy |
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