Fix print usage message issues for ch4 and ch8, and check fin is open before use it for direct_sparse and direct_semidense. #92
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CH4
Ch4中的OpenCV进行基本的图像操作,当没有图像路径输入的时候,会提示一个不太明确的错误:
这段错误应该是指的下面读取图像文件名称的时候,参数数组越界出错(argv)。
在Main函数开始的时候添加适当的使用提示,比较清晰。
CH8
直接法中的两个代码的Usage提示消息有误,与LK光流一样,还有没有检查associate.txt文件读取失败,但是没有数据文件也不报错,只是输出下面的信息。