1. A method for sensing an image mark on a microform using a digital microform imaging apparatus, the apparatus having an area sensor, the method comprising the steps of: defining an image mark region of interest within a pixel array of the area sensor, the pixel array having a predefined number of pixels and the image mark region of interest having a predefined number of pixels less than the predefined number of pixels in the pixel array; sensing at least one image mark on the microform using the image mark region of interest; and sensing an image on the microform using the area sensor.