Fast Computation of the High Resolution Image Restoration by using the Discrete Cosine Transform
Fast Computation of the High Resolution Image Restoration by using the Discrete Cosine Transform
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DOI：
10.1109/icassp.2007.366015
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发表时间：
2007-04
期刊：
影响因子：
--
通讯作者：
Y. Abe;Y. Iiguni
中科院分区：
文献类型：
--
作者：
Y. Abe;Y. Iiguni
提出了一种利用离散余弦变换（DCT）从下采样后的低分辨率图像恢复高分辨率图像的方法。下采样过程以矩阵形式建模，通过DCT矩阵的相似变换使下采样矩阵成为稀疏矩阵。然后，恢复的高分辨率图像可以通过使用相似变换以标量形式表示，并从低分辨率图像有效地计算。计算机仿真结果表明，该方法在高分辨率图像恢复性能上上级三次样条插值。
The high resolution image restoration method from a down-sampled low resolution image by using the discrete cosine transform (DCT) is proposed. The downsampling process is modeled in matrix form and the similar transformation by the DCT matrix makes the downsampling matrix to be a sparse matrix. Then the restored high resolution image can be expressed in a scalar form by using the similar transformation and efficiently computed from the low resolution image. Computer simulations show that the proposed method is superior to the cubic spline interpolation in the high resolution image restoration performance.