public void measureROIs() {
   targets = new double[] {0, 0, 0, 0, 0, 0, 0, 0, 0};
   // System.out.println("acquireImageAndMeasure");
   byte[] data = acqCtrl.acquireSampleImage();
   // measure intensity at ROIs
   ImageStatistics[] iStats =
       measureROIsIn(data, acqCtrl.getImageWidth(), acqCtrl.getImageHeight(), rois);
   for (int i = 0; i < numIDs; i++) {
     measurements[i] = Math.abs(iStats[i].meanInROI - slmModel.getZeroIntensity() - targets[i]);
   }
   IJ.log("\nMeasured ROIs:");
   for (int i = 0; i < numIDs; i++) {
     IJ.log(
         "   sector "
             + i
             + ": " // + settings[i]
             + " = "
             + measurements[i]);
   }
 }