metricsROI

   roiLocs = metricsROI(hndl,whichImage)

Author: ImagEval
Purpose:
    Pick out an ROI from one of the 3 windows in the metrics window.
    These are img1,img2, and metricImage.

 Examples:
    hndl = guidata(metricsWindow);
    roiLocs = metricsROI(hndl,'img1');
    roiLocs = metricsROI(hndl,'img2');
    h = metricsWindow; roiLocs = metricsROI(h,'metricImage');