An image forming apparatus includes an image forming device, an adhesion processing device, an adhesion device, and a fixing device. The determining unit determines whether to print a borderless image or not. The adder takes one adjustment parameter and one return signal as a basis to create the first output signal, with the possibility to program the adjustment parameter. Using the determined search range, an optimal motion vector is detected while sequentially changing the pixel-based sizes of the motion compensating blocks. The distal end is radially offset from the longitudinal axis and defines a cavity. The inkpad base can be freely demounted from and assembled to the base so that it is convenient for the user to grasp the inkpad.