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    • 5. 发明授权
    • Dynamic anomalous pixel detection and correction
    • 动态异常像素检测和校正
    • US07009644B1
    • 2006-03-07
    • US09464364
    • 1999-12-15
    • George SanchezBryed BillerbeckRemy Zimmerman
    • George SanchezBryed BillerbeckRemy Zimmerman
    • H04N9/64
    • H04N5/3675H04N5/2173H04N5/232H04N19/00H04N21/4143
    • A method and a system for dynamically detecting and correcting anomalous pixels in the raw data taken from an image sensor array such as a CCD or a CMOS sensor array, thus allowing the use of dumb cameras to capture digital images for subsequent use by an intelligent host—such as being displayed on a computer monitor. This invention uses software algorithms running on an intelligent host processor to dynamically correct the anomalous pixels in the raw data taken from an image sensor array typical of those in a digital still or a video camera. Using the combination of a dumb camera which provides raw data to an intelligent host, which does all the subsequent image processing, the system works by scanning an image frame for pixels that vary more than a specified amount in their brightness value from their neighboring pixels and designating those as defective pixels. The location and frequency of the photosites sending the defective pixels are stored in a statistical database in the computer's memory. The brightness value of a defective pixel is then replaced by a local brightness value obtained from the defective pixel's neighboring pixels. The process includes video subsampling, meaning that the defective pixel detection is carried out and repeated at a pre-specified frame rate to ensure optimum detection and correction at a minimal level of scanning. A statistical database is kept so that truly anomalous pixels can over time be distinguished from false detection of true anomalies in the target image, lighting or other environmentally induced anomalies.
    • 一种用于动态地检测和校正从诸如CCD或CMOS传感器阵列的图像传感器阵列获取的原始数据中的异常像素的方法和系统,从而允许使用哑光相机捕获数字图像以供智能主机随后使用 如显示在电脑显示器上。 本发明使用在智能主机处理器上运行的软件算法来动态校正从数字静态或摄像机中典型的图像传感器阵列中获取的原始数据中的异常像素。 使用向原始数据提供原始数据的智能主机的组合,其进行所有随后的图像处理,系统通过对来自其相邻像素的亮度值变化多于指定量的像素的像素扫描图像帧来工作,以及 将其指定为缺陷像素。 发送缺陷像素的照片的位置和频率被存储在计算机内存中的统计数据库中。 然后,由从缺陷像素的相邻像素获得的局部亮度值替换缺陷像素的亮度值。 该过程包括视频子采样,这意味着以预定的帧速率执行和重复缺陷像素检测,以确保在最低扫描水平下的最佳检测和校正。 保持一个统计数据库,使真正的异常像素随着时间的推移与目标图像,照明或其他环境引起的异常中的真实异常的错误检测区分开来。