将秘密信息以文件流的操作方式嵌入到BMP文件冗余字节中，对原BMP文件的显示没任何影响。

The secret information is embedded in the redundancy bytes of BMP file, whichdoesn't affect the display of former file.

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利用冗余压缩就能够显示出只有25%原始视频信息的图像。

By taking advantage of redundancy compression, it becomes possible to display an image with only 25 per cent of the original video information.

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