VFYW #32 (Baby Step):

VFYW #32:

The Graffiti wall indicates the picture is taken at Madrid. But where is it?

Baby Step: Put query image and candidates side by side and see if human can VERIFY it.


Original Image (#32):

Compare rectified image with Google road map and satellite map:

The acute angle between graffiti wall and road helps to verify that these two images could be the same.

Since the rectified image is up to metric, the area of plaza should be the same.

The region of plaza is annotated by Google map (it is possible to fill in plaza region easily).

The area of some annotated region can be a strong cue for verification. 

In this case:

1) the acute angle between road and graffiti wall helps us to verify the case.

2) the area and shape of a region with annotation also helps us to filter out major parts in the map.

To reject a false positive from Google search by image:

The image is the first entry retrieved by Google search by image with key word "google map panoramio".

We try to use two rules (check angle and area) to verify this image.

(This image does not be annotated with building...)

The reasons we can reject this image:

1) Only few acute angle between roads between road are shown.

2) Since testing and reference images are in the same scale. It is easy to show there is no good region match between these two images.