Auto-focusing system based on DSP

Feng Yu Wang; Rui Wang; Guang Jun Zhang

Auto-focusing system based on DSP

Feng Yu Wang^*
, Rui Wang
, Guang Jun Zhang

^*Corresponding author for this work

School of Instrumentation and Optoelectronic Engineering

Beihang University

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The focus evaluation functions on the basis of spatial domain are analyzed. Then, Tenengrad function based on Sobel operator is chosen as the focus evaluation function. Tenengrad function is improved to overcome the great computation cost and a x/y Tenengrad function which can be real-timely implemented in the Digital Signal Processing (DSP) platform is put forward. Experimental results indicate that with almost the same focusing precision, the focusing computation time for per image of 768 × 576 is within 25 ms, which is one thirty-fifth of that of the classic Tenengrad function. By finishing the video driver and UART driver in the TMS320DM642 platform, an auto-focusing system comprising x/y Tenengrad function and global searching algorithm is set up successfully.

Original language	English
Pages (from-to)	134-138
Number of pages	5
Journal	Guangdian Gongcheng/Opto-Electronic Engineering
Volume	34
Issue number	8
State	Published - Aug 2007

Keywords

Automatic focusing
DSP
Evaluation function
Tenengrad function

Cite this

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title = "Auto-focusing system based on DSP",

abstract = "The focus evaluation functions on the basis of spatial domain are analyzed. Then, Tenengrad function based on Sobel operator is chosen as the focus evaluation function. Tenengrad function is improved to overcome the great computation cost and a x/y Tenengrad function which can be real-timely implemented in the Digital Signal Processing (DSP) platform is put forward. Experimental results indicate that with almost the same focusing precision, the focusing computation time for per image of 768 × 576 is within 25 ms, which is one thirty-fifth of that of the classic Tenengrad function. By finishing the video driver and UART driver in the TMS320DM642 platform, an auto-focusing system comprising x/y Tenengrad function and global searching algorithm is set up successfully.",

keywords = "Automatic focusing, DSP, Evaluation function, Tenengrad function",

author = "Wang, \{Feng Yu\} and Rui Wang and Zhang, \{Guang Jun\}",

year = "2007",

month = aug,

language = "英语",

volume = "34",

pages = "134--138",

journal = "Guangdian Gongcheng/Opto-Electronic Engineering",

issn = "1003-501X",

publisher = "Chinese Academy of Sciences",

number = "8",

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TY - JOUR

T1 - Auto-focusing system based on DSP

AU - Wang, Feng Yu

AU - Wang, Rui

AU - Zhang, Guang Jun

PY - 2007/8

Y1 - 2007/8

N2 - The focus evaluation functions on the basis of spatial domain are analyzed. Then, Tenengrad function based on Sobel operator is chosen as the focus evaluation function. Tenengrad function is improved to overcome the great computation cost and a x/y Tenengrad function which can be real-timely implemented in the Digital Signal Processing (DSP) platform is put forward. Experimental results indicate that with almost the same focusing precision, the focusing computation time for per image of 768 × 576 is within 25 ms, which is one thirty-fifth of that of the classic Tenengrad function. By finishing the video driver and UART driver in the TMS320DM642 platform, an auto-focusing system comprising x/y Tenengrad function and global searching algorithm is set up successfully.

AB - The focus evaluation functions on the basis of spatial domain are analyzed. Then, Tenengrad function based on Sobel operator is chosen as the focus evaluation function. Tenengrad function is improved to overcome the great computation cost and a x/y Tenengrad function which can be real-timely implemented in the Digital Signal Processing (DSP) platform is put forward. Experimental results indicate that with almost the same focusing precision, the focusing computation time for per image of 768 × 576 is within 25 ms, which is one thirty-fifth of that of the classic Tenengrad function. By finishing the video driver and UART driver in the TMS320DM642 platform, an auto-focusing system comprising x/y Tenengrad function and global searching algorithm is set up successfully.

KW - Automatic focusing

KW - DSP

KW - Evaluation function

KW - Tenengrad function

UR - https://www.scopus.com/pages/publications/34548638610

M3 - 文章

AN - SCOPUS:34548638610

SN - 1003-501X

VL - 34

SP - 134

EP - 138

JO - Guangdian Gongcheng/Opto-Electronic Engineering

JF - Guangdian Gongcheng/Opto-Electronic Engineering

IS - 8

ER -

Auto-focusing system based on DSP

Abstract

Keywords

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