-
公开(公告)号:EP2081155A1
公开(公告)日:2009-07-22
申请号:EP08164269.6
申请日:2008-09-12
CPC分类号: G06T9/00 , H04N19/11 , H04N19/14 , H04N19/176 , H04N19/426 , H04N19/46 , H04N19/593 , H04N19/90 , H04N19/96
摘要: A pixel block (300) is compressed by sub-sampling at least a portion of the pixels (310) into subblocks (320,330). Predictions are determined for the property values of these subblocks (320,330) by calculating a variance measure based on property values of neighboring pixels (310)/subblocks (320,330) in two prediction directions in the block (300) relative to a current subblock (320,330). If the variance is below a threshold, the prediction is calculated based on neighboring property values in both directions. If the measure exceeds the threshold, the neighboring property values in only one of the two predictions are used for calculating the prediction. A guiding bit (450) descriptive of the selected direction is also provided. A prediction error is calculated based on the property value and the calculated prediction. The compressed block (400) comprises an encoded representation (460) of the prediction error and any guiding bit (470).
摘要翻译: 通过将至少一部分像素(310)对子块(320,330)进行子采样来压缩像素块(300)。 通过基于相对于当前子块(320,330)的块(300)中的两个预测方向上的相邻像素(310)/子块(320,330)的属性值的方差度量来计算这些子块(320,330)的属性值的预测 )。 如果方差低于阈值,则基于两个方向上的相邻属性值来计算预测。 如果度量超过阈值,则仅使用两个预测中的一个的相邻属性值用于计算预测。 还提供了描述所选方向的引导位(450)。 基于属性值和计算出的预测计算预测误差。 压缩块(400)包括预测误差的编码表示(460)和任何引导位(470)。
-
公开(公告)号:EP1659538B1
公开(公告)日:2008-01-09
申请号:EP04027592.7
申请日:2004-11-19
IPC分类号: G06T15/40
CPC分类号: G06T15/405 , G06T15/40
-