FDCT

We put forward a new method of both HVQ and FDCT, and improved the original JPEG system. The part of mapping in original JPEG has been modified as a combination of HVQ and hierarchical FDCT.

提出了一种新的分层矢量量化方法和一种新的FDCT变换方式，对基本JPEG系统做了改进。

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Watermark embedding module is embedded in FDCT circuit to reduce data latency.

将水印嵌入模块嵌入到FDCT电路中，充分利用FDCT电路数据转置输出的时间，减少了数据的延迟时间，使FDCT电路的输出数据即为嵌入水印后的频域系数。

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Embedded the watermark information into intermediate frequency in the DCT-based watermark algorithm. Improved the DCT transform speed by using FDCT instead of DCT. Quantized the frequency coefficients by using quantized table made from mentality visual threshold.

在基于DCT的数字水印算法中利用FDCT变换实现DCT变换，大大提高了变换速度，为了得到中频系数采用了依据心理视觉阈值制作的量化表对频率域系数进行量化。

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An Assembly Optimization Algorithm of Scan Quantization and FDCT Based on VLIW

基于VLIW的汇编级FDCT和扫描量化优化算法

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The basic rule of the adaptive quantization is: to add adaptive processing to FDCT and produce new quantization form instead of the fixed quantization form.

自适应量化的基本思想是：在FDCT过程中加入自适应处理，生成新的量化表代替固定量化表，再将其数据与FDCT处理的数据一起传送到熵编码器。

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