1. A multi-resolution charge-coupled device (CCD) sensing apparatus, comprising: a photo sensor set having a plurality of photo sensing components for receiving a light signal and generating a plurality of corresponding charge signals accordingly; a shift gate having a plurality of switches for receiving the charge signals from the photo sensing components; and a first CCD shift register having M CCD components and a second CCD shift register having N CCD components, the M CCD components being coupled with at least parts of the switches and the N CCD components being coupled with at least parts of the switches, wherein M and N are positive integers and M is larger than N, value M corresponds to scanning at a first resolution, and the value N corresponds to scanning at a second resolution; wherein the switches selectively output the charge signals to the M CCD components while scanning at the first resolution, and the switches selectively output the charge signals to the N CCD components while scanning at the second resolution.