Just type 'fn_imvalue' in the Matlab command.
Then all existing and new graphs or image displays will be automatically inspected, and linked together when they have the same size. And then mouse pointing or dragging in one of the figures will result in picking values, panning, zooming in or out, in all the linked figures.
Demonstration video on http://www.weizmann.ac.il/home/deneux/toolboxMatlab/fn_imvalue.html.
'fn_imvalue image' to additionally force images to have square pixels
'fn_imvalue clean' to remove the crosshair and pixel value
'fn_imvalue end' to sop the automatic linking
'fn_imvalue chgx/chgy/chxy value' to set a common axis.
'fn_imvalue' IS PART OF THE 'brick' TOOLBOX, DOWNLOADING ONLY THE FUNCTION HERE WILL NOT WORK BECAUSE OF MISSING DEPENDENCIES, YOU MUST DOWNLOAD THE FULL TOOLBOX AT http://www.mathworks.com/matlabcentral/fileexchange/36209-brick-toolbox