1. An agricultural work machine comprising: a crop gathering machine comprising at least one of a crop cutting device, a crop collecting device or a crop feeding device, and at least one crop conveyor; an image processing system; a data output unit; and at least one sensor system assigned to the crop gathering machine for generating images in order to record a crop flow in the crop gathering machine, wherein the sensor system is in communication with the image processing system in order to transfer the images, wherein the image processing system is configured to process a selection of the images by: (1) pre-processing the images, (2) determining an optical flow and corresponding vector fields from the pre-processed images, and (3) deriving and assessing speed trends of the crop flow from the corresponding vector fields.