发明名称 |
FOCUS CONTROL APPARATUS AND METHOD |
摘要 |
A focus control apparatus that achieves a focused state even when a subject is a point light source includes a contrast signal generator that divides a captured image screen into a plurality of areas, extracts a frequency component based on a video signal for each of the divided areas, and generates a first contrast signal based on the frequency component. A controller extracts a luminance intensity based on the video signal for each of the divided areas, determines, for each of the divided areas, a second contrast signal generated by increasing or decreasing the magnitude of the first contrast signal from the divided area based on the magnitude of the luminance intensity, determines a lens position evaluation value that is the sum of the second contrast signals, and performs the focus control based on the lens position evaluation value. |
申请公布号 |
US2015189155(A1) |
申请公布日期 |
2015.07.02 |
申请号 |
US201414548404 |
申请日期 |
2014.11.20 |
申请人 |
HITACHI INDUSTRY & CONTROL SOLUTIONS, LTD. |
发明人 |
UMEZAWA Iori;NISHIGUCHI Tomoaki |
分类号 |
H04N5/232 |
主分类号 |
H04N5/232 |
代理机构 |
|
代理人 |
|
主权项 |
1. An imaging apparatus that performs focus control, the imaging apparatus comprising:
a contrast signal generator that divides a captured image screen into a plurality of areas, extracts a frequency component based on a video signal for each of the divided areas, and generates a first contrast signal based on the frequency component; and a controller that extracts a luminance intensity based on the video signal for each of the divided areas, determines, for each of the divided areas, a second contrast signal generated by increasing or decreasing the magnitude of the first contrast signal from the divided area based on the magnitude of the luminance intensity, determines a lens position evaluation value that is the sum of the second contrast signals, and performs the focus control based on the lens position evaluation value. |
地址 |
Ibaraki JP |