Based on analyzing the file format of 24-bits BMP image file, this paper puts forth a new encoding method for 24-bits BMP image file.

论文基于对24位BMP图像文件格式的分析，提出了一种24位BMP图像按位权编码方法。

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Experiments prove that this method can not only help to improve compression rate of 24-bits BMP image file, but also provide an easy way for information hiding.

实验证明，采用该方法不仅有助于提高图像的压缩比，而且可方便地实现信息的隐藏。

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BMP image is one of the most useful image formats, which consists of four parts: file header, file information header, palette, image data.

BMP图像是最常用的图像格式之一，它由文件头、文件信息头、调色板和图像数据四部分组成。

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