The Research and Application of Auto-Focus Based on Hi3515

Yan Long Liu; Jian Jun Guo; Fu Mei Zhao

doi:10.4028/www.scientific.net/AMM.192.440

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 192The Research and Application of Auto-Focus Based...

The Research and Application of Auto-Focus Based on Hi3515

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) shown as Eq. (2) was used to indicate whether the system was 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 employed 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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Periodical:

Applied Mechanics and Materials (Volume 192)

Pages:

440-444

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.192.440

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Online since:

July 2012

Authors:

Yan Long Liu, Jian Jun Guo, Fu Mei Zhao

Keywords:

4x4 Integer DCT, Auto-Focus, Focus Strategy, Hi3515

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