An agricultural working vehicle, in particular a self-propelled harvesting machine, with a harvested material recovery device which has a harvested material cutting device, a harvested material pickup device and/or a harvested material intake device, and at least one harvested material feeding device, and an image processing system, a data output unit and comprising at least one sensor system associated with the harvested material recovery device for detecting a flow of harvested material in the harvested material recovery device, wherein the sensor system is coupled to the image processing system in order to transfer the images, wherein the images generated by the sensor system are transferred to the image processing system, wherein the image processing system processes a selection of available images, characterized in that the image processing system pre-processes the transferred images in a first step, the image processing system is configured to determine an optical flow and corresponding vector fields from the pre-processed images in a further step, and in the further step for determining the optical flow, to determine positional shifts of intensity patterns between the images (43, 44) of at least one image pair, wherein the positional shifts comprise shift values and shift directions, and to combine the shift values and shift directions of the intensity patterns for each image pair as respective vectors in the corresponding vector field, in particular in a matrix, of the respective image pair, and in a subsequent step, the image processing system is configured to derive and assess material flow speed profiles for the flow of harvested material from the corresponding vector fields and then to transfer the derived and assessed material flow speed profiles to a data output unit coupled to the image processing system, the data output unit is configured to make the derived and assessed material flow speed profiles available to a control and regulation unit of the agricultural working machine, wherein the control and regulation unit is configured to identify a zonal reduction in the material flow speeds and/or the averaged material flow speeds and to interpret it as the occurrence of a material jam, and to disperse the material jam which has occurred by implementing regulating measures. wherein the images generated by the sensor system are transferred to the image processing system, wherein the image processing system processes a selection of available images, characterized in that the image processing system pre-processes the transferred images in a first step, the image processing system is configured to determine an optical flow and corresponding vector fields from the pre-processed images in a further step, and in the further step for determining the optical flow, to determine positional shifts of intensity patterns between the images (43, 44) of at least one image pair, wherein the positional shifts comprise shift values and shift directions, and to combine the shift values and shift directions of the intensity patterns for each image pair as respective vectors in the corresponding vector field, in particular in a matrix, of the respective image pair, and in a subsequent step, the image processing system is configured to derive and assess material flow speed profiles for the flow of harvested material from the corresponding vector fields and then to transfer the derived and assessed material flow speed profiles to a data output unit coupled to the image processing system, the data output unit is configured to make the derived and assessed material flow speed profiles available to a control and regulation unit of the agricultural working machine, wherein the control and regulation unit is configured to identify a zonal reduction in the material flow speeds and/or the averaged material flow speeds and to interpret it as the occurrence of a material jam, and to disperse the material jam which has occurred by implementing regulating measures.