A method and apparatus are described which perform bandwidth aggregation by simultaneously monitoring and processing a number of simultaneous, non-contiguous or contiguous component carriers in the downlink. Each half circuit includes a first MOS transistor as the input device and a source follower, a second MOS transistor as a transconductance amplifier device, and a third MOS transistor as a folded cascode device. The first heat-dissipating body is mounted on the supporting base. Such errors typically occur due to the misclassification of pixels relating to shadows in an input image as part of the subject object 210 and the misclassification of pixels relating to features on the surface on which the subject object 210 is placed for imaging as part of the subject object 210.