Method and system for determining the velocity and level of a moving fluid surface

摘要

The invention relates to a method for determining the velocity of a moving fluid surface, which comprises the following steps S1 to S5:
S1) taking a sequence of images of the moving fluid surface by at least one camera;
S2) comparing a first image from the sequence with a second image from the sequence in order to distinguish moving patterns of the fluid surface from non-moving parts and to obtain a first processed image (im_1f) comprising the moving patterns;
S3) comparing a third image from the sequence with a fourth image from the sequence in order to distinguish moving patterns of the fluid surface from non-moving parts and to obtain a second processed image (im_2f) comprising the moving patterns;
S4) comparing the first and second processed images in order to determine the spatial displacements of the moving patterns; and
S5) determining from the spatial displacements the velocity.