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1. 发明授权

US07978934B2 Method and device for selecting optimal transform matrices for down-sampling DCT image 有权
标题翻译：用于选择用于下采样DCT图像的最优变换矩阵的方法和装置
公开(公告)号：US07978934B2
公开(公告)日：2011-07-12
申请号：US12133095
申请日：2008-06-04
申请人： Xiang Yu , En-hul Yang , Halquan Wang
发明人： Xiang Yu , En-hul Yang , Halquan Wang
IPC分类号： G06K9/36
CPC分类号： G06T3/4084 , H04N19/40 , H04N19/48 , H04N19/60
摘要： 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.
摘要翻译：可以在DCT域中执行图像的下采样。获得变换矩阵，以将尺寸为M×N的DCT图像下降为尺寸为I×J的下采样DCT图像。变换矩阵可以用于在DCT域中直接对DCT图像进行下采样。选择空间域下采样方法并将其应用于DCT图像以产生下采样DCT参考图像。通过求解优化问题来选择变换矩阵，导致变换矩阵，其在使用变换矩阵获得的图像的视觉质量和与使用变换矩阵相关联的计算复杂度之间实现期望的权衡。视觉质量是使用变换矩阵获得的下采样DCT图像与使用空间域下采样方法获得的DCT参考图像的视觉质量之间的差的度量。

2. 发明授权

US08792742B2 Method and device for down-sampling a DCT image in the DCT domain 有权
标题翻译：用于在DCT域中对DCT图像进行下采样的方法和装置
公开(公告)号：US08792742B2
公开(公告)日：2014-07-29
申请号：US13311781
申请日：2011-12-06
申请人： Xiang Yu , En-hul Yang , Halquan Wang
发明人： Xiang Yu , En-hul Yang , Halquan Wang
IPC分类号： G06K9/46
CPC分类号： G06T3/4084
摘要： A method and device that uses transform matrices to down-sample a DCT image directly in the DCT domain. The transform matrices have been selected to minimize an optimization problem which is a function of the visual quality of down-sampled images obtained using the matrices and the computational complexity associated with using the transform matrices. The transform matrices comprise a row transform matrix and a column transform matrix. A down-sampled image is produced by determining an intermediary matrix as the product of the DCT image and one of either the row transform matrix or the column transform matrix and then determining the down-sampled image as the product of the intermediary matrix and the transform matrix not already used to determine the intermediary matrix.
摘要翻译：一种使用变换矩阵直接在DCT域中对DCT图像进行下采样的方法和装置。已经选择了变换矩阵以最小化优化问题，该优化问题是使用矩阵获得的下采样图像的视觉质量以及与使用变换矩阵相关联的计算复杂度的函数。变换矩阵包括行变换矩阵和列变换矩阵。通过将中间矩阵确定为DCT图像与行变换矩阵或列变换矩阵之一的乘积，然后将下采样图像确定为中间矩阵和变换的乘积来产生下采样图像矩阵尚未用于确定中间矩阵。

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