Determining individual pixel color

Hello,

I'm assembling a time lapse video from several thousand images. 
Unfortunately, there was a problem with the camera and roughly half of 
these images are shifted up on the X axis by several pixels (creating a 
jitter). Instead of using fancy software such as Adobe After Effects, 
I'd like to script something with image magick to identify which images 
are shifted and then automatically "fix" these images. The problem I'm 
having is identifying which ones are shifted. My initial thought was to 
obtain the color of a certain reliable pixel in every image and use that 
to determine which ones are shifted, however I can't seem to figure out 
how to do that in image magick.

Is it possible? Is there are better approach?

Thanks!!

Eric Schoeller