Abstract: A method and system for detecting changes in moving images, wherein the system includes an image pick-up unit (3), an arithmetic unit (1), and a storage device (2). The image pick-up unit (3) records images by pixels. The arithmetic unit (1) files the video signals by pixels in the storage device (2). The arithmetic unit (1) calculates the change in the video signals of the blocks of the image n+1 with reference to the preceding image n. Different values are assigned to the blocks depending on whether the change is larger or smaller than a threshold, i.e., depending on whether the blocks are supposed to be treated further as changed or not changed. The threshold becomes all the lower the more adjacent blocks that have been designated as changed when compared to their thresholds.

Abstract: The present invention relates to a method for producing a closing layer which improves the water and nutrient retention of soils, particularly of sandy soils, characterized in that a layer of clay mineral/polymer gel capable of binding and releasing water in a reversible manner is introduced into the soil, preferably 20-60 cm below the soil surface, in such a way that a clay mineral is reacted either before or after or during activation in the presence of water, with 0.