An image processing device includes a first and second rotating member configured to selectively rotate between an open position and a closed position, and a first and second actuator configured to rotate in sync with the first rotating member and the second rotating member, respectively. The image processing device also includes a light sensor including a light emitter configured to emit a light, and a light receptor positioned opposite the light emitter. The light receptor is configured to receive the light from the light emitter, and a space is formed between the light emitter and the light receptor. In addition, the first actuator is selectively positioned within the space and outside of the space based on the position of the first rotating member, and the second actuator is selectively positioned within the space and outside of the space based on the position of the second rotating member. Moreover, the light sensor detects whether the first rotating member is in the open position or the closed position based on whether the first actuator is positioned within the space or outside of the space, and the light sensor detects whether the second rotating member is in the open position or the closed position based on whether the second actuator is positioned within the space or outside of the space.