1. A non-transitory computer-readable medium comprising computer-readable instructions for check detection, said computer-readable instructions comprising instructions for causing a processor to: divide a grayscale image of a digital image into a plurality of segments, wherein the digital image includes a check image and a background image, and wherein each segment comprises a portion of the check image and a portion of the background image; determine a threshold on a data construct of grayscale levels of each segment between data representing the portion of the check image on the segment and data representing the portion of the background image on the segment; identify the portion of the background image using the threshold; process each segment to remove the identified portion of the background image; recombine the segments to form a digital image file comprising the check image; and transmit the digital image file to an institution for processing of a check associated with the check image in the digital image file.