It is practical to study image coding technique based on DCT.
因此，研究基于DCT的图像编码技术，有着一定的是实用价值。
This paper proposes a robust watermarking algorithm for volume data based on three-dimension discrete cosine transform(3D-DCT) and spread-spectrum communication technique.
本文基于三维离散余弦变换（3D-DCT）技术和扩频通信技术提出三维体数据鲁棒水印嵌入算法。
This digital image transmission technique improves the quality of DCT image.
实验结果表明这种数字图像传输技术改善了DCT图像质量。
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