Update README.md

Author: qianngli

README.md

@@ -39,3 +39,5 @@ Result
 |  x2 |  45.102 / 0.9738 / 2.241 | 46.263 / 0.9827 / 1.883  | 58.878 / 0.9988 / 4.061 | 
 |  x3 |  41.031 / 0.9526 / 2.809  |  42.681 / 0.9627 / 2.214 | 55.017 / 0.9970 / 5.126  |   
 |  x4 | 39.026 / 0.9319 / 3.292 |  40.081 / 0.9367 / 2.410 | 52.225 / 0.9941 / 5.685  | 
+
+![image](https://github.com/qianngli/Images/blob/master/visual_cave_lemons.tiff)