公开(公告)号：US20020097328A1

公开(公告)日：2002-07-25

申请号：US09939517

申请日：2001-08-24

Applicant: STMicroelectronics Ltd.

Inventor： Robert Henderson ,  Stewart Gresty Smith ,  Jonathan Ephriam David Hurwitz ,  Andrew Murray

IPC: H04N005/235

CPC classification number: H04N5/2357 ,  H04N5/235 ,  Y10S348/91

Abstract: Lighting flicker in the output of a video imaging device is detected. The video imaging device has a main picture area divided into pixels for producing successive images at a frame rate. A series of signals are produced from at least one additional picture area adjacent the main picture area, with the additional picture area having a size substantially larger than a pixel. Each of the signals is a function of light incident on the additional picture area in a time period substantially shorter than that of the frame rate. A predetermined number of the signals are accumulated to form a series of compound samples, and the compound samples are filtered to detect components indicating the lighting flicker. The filtering is performed using a bandpass filter tuned to the nominal flicker frequency. The compound samples are formed at a sample rate which is a multiple of the nominal flicker frequency, and the filtering is performed by taking the fundamental output component of a radix-N butterfly.

Abstract translation: 检测出影像成像装置的输出中的照明闪烁。 视频成像装置具有划分为像素的主图像区域，用于以帧速率产生连续的图像。 从与主图像区域相邻的至少一个附加图像区域产生一系列信号，其中附加图像区域的尺寸基本上大于像素。 每个信号是在比帧速率短的时间周期内入射到附加图像区域上的光的函数。 累积预定数量的信号以形成一系列化合物样品，并且过滤化合物样品以检测指示照明闪烁的组分。 使用调谐到标称闪烁频率的带通滤波器来执行滤波。 复合样本以标称闪烁频率的倍数的采样率形成，并且通过获取基数N蝶形的基本输出分量来执行滤波。