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。
Auto-focus is a key technology for visual presenter,how to achieve the function of auto-focus on Hi3515 is presented in this paper. The 4 × 4 integer DCT（ Discrete Cosine Transform）is used to indicate whether the system is on accurate focus or not. Because the 4 × 4 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 is employecl to achieve auto-focus.
出处
《电视技术》
北大核心
2012年第19期74-76,共3页
Video Engineering
