3 - 12 4600rp, 4600g/4600r, 4800i User’s GuideCenteringUse Centering to narrow the imager’s field of view to make sure the imager readsonly those barcodes intended by the user. For instance, if multiple codes areplaced closely together, centering will insure that only the desired codes areread. (Centering can be used in conjunction with Aimer Delay, page 3-10, forthe most error-free operation in applications where multiple codes are spacedclosely together. Using the Aimer Delay and Centering features, the imager canemulate the operation of older systems, such as linear laser barcode imagers.)In the example below, the gray area is the full imager field of view and the whitearea is the centering window. Barcode 1 will not be read, while Barcode 2 willbe.The default centering window is a 128x96 pixel area in the center of the imager’sfield of view. The following diagram illustrates the default top, bottom, left, andright pixel positions, measured from the top and the left side of the imager’s fieldof view, which is 640 by 480 pixels.If a barcode is not within the predefined window, it will not be decoded or outputby the imager. If centering is turned on by scanningCentering On, the imageronly reads codes that intersect the centering window you specify using theTop,Bottom,Left, orRight barcodes.Barcode 1Barcode 20100%100%DefaultCenter40% 60%40%60%LeftRightBottomTop
