A method of processing a digital image using face detection within the image achieves one or more desired image processing parameters. A device for performing the method comprises a plurality of tension adjusting axial seats; a plurality of roller; a pair of first guide wheels; an upper and a lower layer radiating heater; a third guide wheel set; an upper and a lower layer high temperature radiating heater; a guiding roller; a shaping heater; a plurality of temperature controller roller sets and a product winding wheel. If the input voltage is higher than the threshold level, the frequency of the gate signal is lowered so as to prevent the driving performance of the driving circuit from rising to an excessively high value. When the outer tube is being turned, the turning action makes the transmitting plate a right or left movement as well as an up or down movement, so it further makes the ink cartridge which works as an antenna extending or retracting along the tapered cap. In accordance with one embodiment, the class is indicated by a series of colored dots. Error-detection logic is coupled to an output from the delay element and an output from the receiver.