Parking space coordinates

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Hello,

I'm trying to find parking spaces on an image and create rectangles that will represent them. And when I'm going to do that, all of the parking spaces on the image will be empty. Also, as far as I've noticed, I cannot use the exact same solution for different images (or at least it looks to me that way).

These are some of the images on which I tried to detect the parking spaces: http://www.mattwkane.com/wp-content/u... http://stockarch.com/files/imagecache...

My question is, how can I extract the coordinates of a parking space from an image?