公开(公告)号：US06873657B2

公开(公告)日：2005-03-29

申请号：US10029823

申请日：2001-12-27

申请人： Yibin Yang ,  Lilla Boroczky ,  Johan Janssen

发明人： Yibin Yang ,  Lilla Boroczky ,  Johan Janssen

IPC分类号： H04N5/208 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/12

CPC分类号： H04N19/527 ,  H04N19/85 ,  H04N19/86

摘要： 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.

摘要翻译： 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。