发明名称 |
Method and device for selecting transform matrices for down-sampling DCT image using learning with forgetting algorithm |
摘要 |
Down-sampling of an image may be performed in the DCT domain. A multiple layered network is used to select transform matrices for down-sampling a DCT image of size M×N to a DCT image of size I×J. A spatial domain down-sampling method is selected and applied to the DCT image to produce a down-sampled DCT reference image. A learning with forgetting algorithm is used to apply a decay to the elements of the transform matrix and select a transform matrices which solve an optimization problem. The optimization problem is a function of the visual quality of images obtained using the transform matrices and the computational complexity associated with using the transform matrices. The visual quality is a measure of the difference between the down-sampled DCT image obtained using the transform matrices and the visual quality of the DCT reference image obtained using a spatial domain down-sampling method.
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申请公布号 |
US7995850(B2) |
申请公布日期 |
2011.08.09 |
申请号 |
US20080133083 |
申请日期 |
2008.06.04 |
申请人 |
RESEARCH IN MOTION LIMITED |
发明人 |
YU XIANG;YANG EN-HUI;WANG HAIQUAN |
分类号 |
G06K9/36 |
主分类号 |
G06K9/36 |
代理机构 |
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地址 |
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