How can I figure out number of matches between two pictures

I basically want to know the basic technique for debugging quality of scans by monitoring inspection tool. 

Let say, if I found two camera positions that are aligned but not connected. 

Then, I open two 2D windows to analyze match points. 

It will be easy to figure out if it has just 10~20 points but become hard to analyze if it has 70~80 points. 

I cannot figure out easily what is the root cause of the problem. 

It would be rather easy if I can see the numbers of match point right away. Then I can try some modification on studio and check if the number of match points has increased. 

 

Regards,

Justin