交通管理监视器的视频电路，受通频带限制导致图像轮廓模糊、清晰度下降，通常需要采用双微分视频补偿。
In the video circuit of traffic monitor, the image outline dims and the visibility declines because of the limitation of the passband, thus twice differential video compensation is needed.
子带编码是实现高清晰度电视频带压缩的一种方法。
The subband coding is an efficient method of image compression.
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