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    • 4. 发明授权
    • Apparatus and method for providing a usefulness metric based on coding information for video enhancement
    • 用于基于用于视频增强的编码信息提供有用度量的装置和方法
    • US07161633B2
    • 2007-01-09
    • US09976329
    • 2001-10-12
    • Lilla BoroczkyJohan Janssen
    • Lilla BoroczkyJohan Janssen
    • H04N5/21
    • H04N5/208H04N19/527H04N19/80H04N19/85H04N19/86
    • An apparatus and method for enhancing the quality of a digital video signal uses coding information for use in connection with spatial domain sharpness enhancement algorithms used in multimedia devices. The sharpness of previously encoded or transcoded digital video images is enhanced without enhancing encoding artifacts. The apparatus includes a usefulness metric generator that identifies a limit to the sharpness enhancement of an image that can be applied to a previously coded digital video that represents a sequence of images without enhancing coding artifacts. The usefulness metric generator applies the usefulness metric to at least one sharpness enhancement algorithm. The usefulness metric and the sharpness enhancement algorithm are separate so that the usefulness metric can be used with a variety of video enhancement algorithms.
    • 用于提高数字视频信号质量的装置和方法使用与多媒体设备中使用的空间域锐度增强算法结合使用的编码信息。 先前编码或转码的数字视频图像的清晰度在不增强编码伪像的情况下得到增强。 该装置包括有用度量生成器,其识别可以应用于表示图像序列的先前编码的数字视频而不增强编码伪影的图像的锐度增强的限制。 有用性度量生成器将有用度量应用于至少一个锐度增强算法。 有用性度量和锐度增强算法是分开的,使得有用性度量可以与各种视频增强算法一起使用。
    • 5. 发明授权
    • Method of and system for improving temporal consistency in sharpness enhancement for a video signal
    • 提高视频信号锐度增强的时间一致性的方法和系统
    • US06873657B2
    • 2005-03-29
    • US10029823
    • 2001-12-27
    • Yibin YangLilla BoroczkyJohan Janssen
    • Yibin YangLilla BoroczkyJohan Janssen
    • H04N5/208H04N7/26H04N7/30H04N7/32H04N7/12
    • H04N19/527H04N19/85H04N19/86
    • In accordance with the preferred embodiment of the present invention, a method of and system for improving temporal consistency of an enhanced signal representative of at least one frame using a sharpness enhancement algorithm with an enhancement gain are provided. The method comprises the steps of: receiving the enhanced signal comprising at least one frame, obtaining an enhancement gain for each pixel in the frame, retrieving an enhancement gain value of each pixel in a reference frame from a gain memory using motion vectors, identifying if the frame is an I, P or B frame type and determining an updated enhancement gain for an I frame type by calculating a gain map for use in the sharpness enhancement algorithm. The updated enhancement gain of each pixel is equal to enhancement gain previously determined for use in the sharpness enhancement algorithm. In addition, the method includes storing the updated enhancement gain to gain memory, and applying the updated enhancement gain to the sharpness enhancement algorithm to improve temporal consistency of the enhanced signal. The method may further comprise the step of further improving the updated enhancement gain by applying a motion adaptive temporal IIR filter on the updated enhancement gain.
    • 根据本发明的优选实施例,提供了一种用于使用具有增强增益的锐度增强算法来改善表示至少一帧的增强信号的时间一致性的方法和系统。 该方法包括以下步骤:接收包括至少一个帧的增强信号,获得帧中每个像素的增强增益,使用运动矢量从增益存储器中检索参考帧中每个像素的增强增益值,识别是否 帧是I,P或B帧类型,并且通过计算在锐度增强算法中使用的增益图来确定I帧类型的更新的增强增益。 每个像素的更新的增强增益等于先前确定的用于锐度增强算法的增强增益。 此外,该方法包括将更新的增强增益存储到增益存储器中,以及将更新的增强增益应用于锐度增强算法以改善增强信号的时间一致性。 该方法还可以包括通过对更新的增强增益应用运动自适应时间IIR滤波器来进一步改善更新的增强增益的步骤。