公开(公告)号：EP0986264A2

公开(公告)日：2000-03-15

申请号：EP99202925.6

申请日：1999-09-08

申请人： NDS LIMITED

发明人： Wu, Ping ,  Murray, Kevin ,  Stallard, Paul

IPC分类号： H04N7/50

CPC分类号： H04N19/137 ,  H04N19/103 ,  H04N19/14

摘要： The present invention relates to a method and apparatus for determining visually noticeable differences between two input images. A first contrast image is generated from the first input image and a second contrast image is generated from the second input image. A contrast difference image is then formed from the two contrast images.
Measures are calculated of the mean absolute difference between blocks of pixels of the first and second input image.
Pixels in the contrast difference image are selected which exceed a first threshold and measures of the mean absolute difference are selected which exceed a second threshold. A detection signal is produced from the threshold signals.

摘要翻译： 本发明涉及用于确定两个输入图像之间的视觉上明显差异的方法和设备。 从第一输入图像生成第一造影图像，并且从第二输入图像生成第二造影图像。 然后由两个对比度图像形成对比度差异图像。 度量是计算第一和第二输入图像的像素块之间的平均绝对差值。 选择超过第一阈值的对比度差异图像中的像素，并且选择超过第二阈值的平均绝对差的测量。 从阈值信号产生检测信号。

公开(公告)号：EP0986264A3

公开(公告)日：2000-04-19

申请号：EP99202925.6

申请日：1999-09-08

申请人： NDS LIMITED

发明人： Wu, Ping ,  Murray, Kevin ,  Stallard, Paul

IPC分类号： H04N7/50

CPC分类号： H04N19/137 ,  H04N19/103 ,  H04N19/14

摘要： The present invention relates to a method and apparatus for determining visually noticeable differences between two input images. A first contrast image is generated from the first input image and a second contrast image is generated from the second input image. A contrast difference image is then formed from the two contrast images. Measures are calculated of the mean absolute difference between blocks of pixels of the first and second input image. Pixels in the contrast difference image are selected which exceed a first threshold and measures of the mean absolute difference are selected which exceed a second threshold. A detection signal is produced from the threshold signals.