发明名称 |
Method and apparatus for detecting optimum lens focus position |
摘要 |
The present invention is a technique for measuring optimum focus position of a lens to include the steps of capturing a digital image in the field of view, digitally compressing the image to provide a compressed file having a file size and providing a focus accuracy parameter derived from the file size of the compressed file. The key point of this invention is the recognition that the compressed file associated with a given image increases monotonically in size as the image is brought into focus. The latter occurs because a focused image has greater information content than an unfocused image. With such a technique, an optimal focus position of a lens can be determined by maximizing a single parameter, the compressed output file size.
|
申请公布号 |
US7280149(B2) |
申请公布日期 |
2007.10.09 |
申请号 |
US20010034295 |
申请日期 |
2001.12.21 |
申请人 |
FLEXTRONICS SALES & MARKETING (A-P) LTD. |
发明人 |
WEINTROUB JONATHAN;ARONSON MICHAEL D.;CARGILL ELLEN B. |
分类号 |
H04N5/232;G02B7/36;G03B13/00 |
主分类号 |
H04N5/232 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|