How to find the Lat/Long of a point on image (scanned map)

Hi guys,
I have scanned a map which was in UTM WGS 84 projection system. The scanned map is now in jpg format and loaded into picturebox. If I select a point, how could I know that point's latitude and longitude? How could I integrate a projection system over the image displayed in picturebox?

Thanks.

You have the X and Y mouse position within the PictureBox, you just need to write a transform function that figures out what the Lat and Long change is per pixel of map image. If you find that each pixel of your map is 0.543 Lat and 0.524 Long then you just multiply.

Of course, this function depends completely on your image. A different image may be scaled differently.