Update README.md

README.md

@@ -7,5 +7,5 @@ GAMa (Ground-video to Aerial-image Matching) dataset
 Download at: 
 https://www.crcv.ucf.edu/data1/GAMa/
 
-![image](fig_problem_intro.jpg "Ground-truth video trajectory")
+![image](fig_problem_intro_small.jpg "Ground-truth video trajectory")