发明申请
US20120328183A1 METHOD AND DEVICE FOR SELECTING TRANSFORM MATRICES FOR DOWN-SAMPLING DCT IMAGE USING LEARNING WITH FORGETTING ALGORITHM
有权
用于使用激励算法学习的用于选择用于下采样DCT图像的变换矩阵的方法和装置
- 专利标题: METHOD AND DEVICE FOR SELECTING TRANSFORM MATRICES FOR DOWN-SAMPLING DCT IMAGE USING LEARNING WITH FORGETTING ALGORITHM
- 专利标题(中): 用于使用激励算法学习的用于选择用于下采样DCT图像的变换矩阵的方法和装置
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申请号: US13532827申请日: 2012-06-26
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公开(公告)号: US20120328183A1公开(公告)日: 2012-12-27
- 发明人: Xiang YU , En-hui YANG , Haiquan WANG
- 申请人: Xiang YU , En-hui YANG , Haiquan WANG
- 申请人地址: CA Waterloo
- 专利权人: RESEARCH IN MOTION LIMITED
- 当前专利权人: RESEARCH IN MOTION LIMITED
- 当前专利权人地址: CA Waterloo
- 主分类号: G06K9/36
- IPC分类号: G06K9/36 ; G06K9/62
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.