Detecting a foreign object inside an agricultural harvester machine

A computer-implemented method of operating an agricultural harvester machine, the method comprising:

• providing the agricultural harvester machine;
• and
• detecting a foreign object in the plurality of harvested crops inside the agricultural harvester machine, wherein the detecting the foreign object includes,
• harvesting a plurality of crops using the agricultural harvester machine;
• capturing an input image of the plurality of harvested crops;
• reproducing the input image as an output image using a computer algorithm trained on images of crops with no foreign objects;
• determining a degree of difference between the input image and the output image;
• and
• determining if the foreign object is present in the input image based on the degree of difference between the input image and the output image.