(source code) points click on image and save the coordinate to txt file

environment: Visual C+++ 2008, openCV 2.3
 
This source code is to save the coordinate that you select points on image.
This is useful when you have many image to save coordinates.


Firstly, you should make image file name in number order.
0.jpg, 1.jpg 2.jpg .....

The code ask to you
1. How many file do you have ?
-
2. How many point do you click on image?
-


There are some keys.
Left button is point selection, Cancel is right button, Space key is next button.
and Ese is the button to finish the work.
After finish the work.

The coordinate is stored in "output.txt"
The format is that
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
...

[source code] 


Thanks you.