SIFT can't find corresponding key-points in two images whose colors are reversed. Could anyone give me any suggestion for handling this problem. Thank you. For more clear understanding, check this two images below:
[Image 1](https://drive.google.com/open?id=0Bw0hh4wnR883UG1oM0VBUDRzVWR0bXZTSTNwdkRPQ0U3Q3lv)
[Image 2](https://drive.google.com/open?id=0Bw0hh4wnR883RlJZSFNlM0tMSDVzZDVsbnN3M3ZVU29HVmNn)
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