公开(公告)号：US20050157203A1

公开(公告)日：2005-07-21

申请号：US11011447

申请日：2004-12-15

申请人： Toshio Nakakuki ,  Ritsuya Iida

发明人： Toshio Nakakuki ,  Ritsuya Iida

IPC分类号： G03B7/08 ,  G03B21/40 ,  H04N3/14 ,  H04N5/21 ,  H04N5/222 ,  H04N5/225 ,  H04N5/232 ,  H04N5/235 ,  H04N5/238 ,  H04N5/335 ,  H04N5/341 ,  H04N5/351 ,  H04N5/357 ,  H04N5/372 ,  G03B7/00

CPC分类号： H04N5/2357 ,  H04N5/2351 ,  H04N5/2352

摘要： Flicker, which occurs in photographing of a moving image under lighting by a fluorescent lamp, is detected accurately. A common multiple of a light-emitting period {fraction (1/100)} sec in a region where a frequency of a commercial AC power supply is 50 Hz, a light-emitting period {fraction (1/120)} sec in a region where the frequency is 60 Hz, and 1/fp according to a frame rate fp is defined as a synchronous period. An exposure condition determining unit decides an exposure condition on the basis of an image signal level at each synchronous period and feeds back the exposure condition to exposure control of a frame after the synchronous period. A synchronous level extracting unit extracts image signal levels for plural frames at each synchronous period and a synchronous judging unit judges a stability state of the levels. On the other hand, a flicker judging unit detects presence of a section where a fluctuation in an image signal level between adjacent frames is large in the synchronous period. When the synchronous level judging unit confirms that an exposure stable state is realized, the flicker judging unit makes a result of judgment on flicker based on the fluctuation of a signal level in the synchronous period effective.

摘要翻译： 正确地检测在荧光灯照明下拍摄运动图像时发生的闪烁。 发光周期的共同倍数（分数（商业交流电源的频率为50Hz的区域中的1/100秒，发光周期（分数（频率的区域的1/120秒） 60Hz，根据帧速率fp的1 / fp被定义为同步时段，曝光条件确定单元基于每个同步周期的图像信号电平来决定曝光条件，并将曝光条件反馈到曝光 在同步时段之后的帧的控制，同步电平提取单元在每个同步周期提取多个帧的图像信号电平，同步判断单元判断电平的稳定状态，另一方面，闪烁判断单元检测是否存在 在同步期间相邻帧之间的图像信号电平的波动大的部分，当同步电平判断部确认实现曝光稳定状态时，闪烁判断 g单元基于同步周期中的信号电平的波动有效而产生对闪烁的判断结果。