| 摘要 |
The invention relates to a method for identifying spatially extended and image features (F) that are not interrelated in terms of pixels in two-dimensional digital images (I) to be examined having pixels (P) arranged in a grid-type manner in the form of a rectangular grid, wherein two coordinate values (x, y) are attributed in each case to each pixel (P) of the two-dimensional digital image (I) according to the position thereof in the rectangular grid of the digital image (I), and the respective coordinate values (x, y) of adjacent pixels (P) differ in each case by one pixel dimension, wherein the individual pixels are passed through in the sequence of a regular scan, wherein for each pixel (P) that is run through in such a manner, the following method steps a) to d) are carried out, namely that the color and/or brightness values attributed to the respective pixels are examined with respect to the presence of a predetermined criterion, in particular with respect to exceeding or dropping below a predetermined threshold value (T), when this criterion is present an environment (U) of a predetermined size and shape surrounding the respective pixel (P) is determined, wherein pixels are only added to the environment (U) as environment pixels (Pu) when said environment pixels (Pu) have already been examined with respect to marked pixels (P) in the environment thereof, at least one environment pixel (Pu) is attributed to the environment (U) of the respective pixel (P), wherein at least one of the coordinate values (x, y) of the environment pixel (Pu) differs from the respective coordinate value (x, y) of the pixel (P) by at least two pixel dimensions and within the environment (U) it is searched for already marked environment pixels (Pu), and when a minimum number of marked environment pixels (Pu) is marked with the same marking (Ml...Mn) within the environment (U), in particular of at least one marked environment pixel (Pu), the same marking (Ml...Mn) is attributed to the respective pixel (P), otherwise a new, and not attributed marking (Ml...Mn) is attributed to the respective pixel (P), and subsequently after the passage of the pixel (P) the amounts of pixel (P) to which in each case the same marking (Ml...Mn) has been attributed, are considered as image features (F). |
