Perl和GD是学习本文的必备软件，您即使有首选的图像处理工具套件，也可以修改本文使用的算法以便在各种环境中高效地执行。
Perl and GD are a must for this article, although if you have a preferred image processing tool suite, you can modify the algorithms used here to perform effectively in any number of environments.
对于这部分出错的答题卡，那张答题卡出错选定后可以通过选择点击“修改图像”来打开“画图”等软件来一一修改正确再重新阅一下即可。
Sheet for this part of the error, error that sheet is selected click by selecting the "change image" to open the "drawing" and other software to modify read again the correct one by one.
对于这部分出错的答题卡，那张答题卡出错选定后可以通过选择点击“修改图像”来打开“画图”等软件来一一修改正确再重新阅一下即可。
Sheet for this part of the error, error that sheet is selected click by selecting the "change image" to open the "drawing" and other software to modify read again the correct one by one.
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