发明名称 |
METHOD AND DEVICE FOR SELECTING OPTIMAL TRANSFORM MATRICES FOR DOWN-SAMPLING DCT IMAGE |
摘要 |
<p>Down-sampling of an image may be performed in the DCT domain. Transform matrices are obtained for down-sampling a DCT image of size M×N to a down-sampled DCT image of size I×J. The transform matrices may be used to down-sample the DCT image directly in the DCT domain. A spatial domain down-sampling method is selected and applied to the DCT image to produce a down-sampled DCT reference image. The transform matrices are selected by solving an optimization problem, leading to transform matrices which achieve a desired trade-off between 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.</p> |
申请公布号 |
EP2153405(B1) |
申请公布日期 |
2013.04.03 |
申请号 |
EP20080772773 |
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 |
G06T3/40;G06T9/00 |
主分类号 |
G06T3/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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