An original image is subjected to an opening processing and to a closing processing to obtain a blurred image by using an average value between the result of the opening processing and the result of the closing processing as a reference for correcting the brightness. The stator has portions extending radially inwards of the coils and towards one another beneath each coil, which define a spacing between the coil and the armature. Overtone versions of the resonators that provide for differential input and output signal coupling are described. The annular rings of the upper and lower liner ring are mated slidably with two vertical guide rods. The period of oscillation of a spring depends on the spring constant as well as on the compressing mass, and different sports activities require different periods of oscillation. The first periphery traces are electrically connected to the bonding pads and the first axis electrodes or the second axis electrodes respectively.