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    • 12. 发明授权
    • Subjective noise measurement on active video signal
    • 主动视频信号的主观噪声测量
    • US06359658B1
    • 2002-03-19
    • US09519548
    • 2000-03-06
    • Haiyan HeChristian Hentschel
    • Haiyan HeChristian Hentschel
    • H04N521
    • H04N17/00H04N5/21
    • An apparatus and method is disclosed for measuring and filtering noise signals in an active video signal to create an enhanced video signal that produces a video image that is subjectively perceived to be superior to prior art video images. The apparatus of the invention comprises (1) a filter for filtering frequency components of a video signal, and (2) an absolute value unit for calculating the absolute value of pixels in the filtered video signal, and (3) a clipping unit for clipping the absolute values of the pixels to a threshold value related to subjective human perception abilities, and (4) a summer circuit for summing the values of the clipped signals for pixels that are located within a sliding window, where the sliding window is sequentially located in different areas of a frame of the video image, and (5) a detector for detecting at least one minimum sum of the clipped absolute values of the pixels that is indicative of the noise in the video signal of the video image. The apparatus and method provide ratios of video signal to noise that permit the creation of subjectively superior video images. The apparatus and method also measure blocking artifacts in the video signal.
    • 公开了一种用于测量和滤波有源视频信号中的噪声信号的装置和方法,以产生增强的视频信号,该视频信号产生主观地被认为优于现有技术视频图像的视频图像。 本发明的装置包括:(1)用于滤波视频信号的频率分量的滤波器,和(2)用于计算滤波后的视频信号中的像素的绝对值的绝对值单元,以及(3)用于剪切的剪切单元 像素的绝对值与主观人感知能力相关的阈值,以及(4)用于对位于滑动窗口内的像素的限幅信号的值求和的夏季电路,其中滑动窗口顺序地位于 视频图像的帧的不同区域,以及(5)检测器,用于检测指示视频图像的视频信号中的噪声的像素的限幅绝对值的至少一个最小和。 该装置和方法提供视频信号与噪声的比率,允许创建主观上优越的视频图像。 该装置和方法还测量视频信号中的块伪影。