Out-of-focus blur estimation and restoration for digital auto-focusing system

被引：49

作者：

Kim, SK ^{[1
]}

Paik, JK ^{[1
]}

机构：

[1] Chung Ang Univ, Dept Elect Engn, Tongjak Ku, Seoul 156756, South Korea

来源：

ELECTRONICS LETTERS | 1998年 / 34卷 / 12期

关键词：

D O I：

10.1049/el:19980762

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A fully digital auto-focusing system based on point-spread Function (PSF) estimation is proposed. To increase accuracy in estimating the PSP of the defocused image, the input image is subdivided, and the step responses of edge-containing subimages are averaged. The PSF, which results from out-of-focus blur, is estimated by differentiating the averaged step response along the appropriately estimated edge direction under the assumption that an image usually contains a piece-wise linear boundary between an object and background. By using the estimated PSF, the corresponding image restoration filter is realised, based on the constrained least squares approach.

引用

页码：1217 / 1219

页数：3