Files were allocated using a bitmap of free space, which was not very fast nor very scalable.
ext3使用空闲空间位映射来分配文件，这种方式不是很快，并且伸缩性不强。
2
Even if the invention is affected by exterior and the storing of bitmap information and file system is different, the play data can be read normally.
本发明即使受外部的影响，位图信息和文件系统的内容存储不同，也可以正常读取播放数据。
3
This paper puts forward a method to select threshold by discrimination analysis. The method has been applied to vectorization of bitmap and got satisfactory effects.