By centering the focusedspot on the interested pixel then shifting the spot to leftfor a proper distance, the crosstalk ofthe irradiated pixel to rightadjacentpixel is measured.
Since most image-processing operations, such as sharpening up a fuzzy document, or altering the colours in a photograph, involve looking at the value of a particular pixel and then altering it depending on the value of adjacent pixels, this is a real advantage.