A method to detect and to determine geometrical, dimensional and positional features of products transported by a continuous conveyor, particularly of raw, roughly shaped, roughed or half-finished steel products, moving forward with a transport speed lower or equal to a maximum transport speed, comprising the steps consisting of: - acquiring, through at least an image acquisition device placed crosswise to the forwarding direction of a continuous conveyor and at a distance from it, at least a first series of successive images showing a same area across which runs said continuous conveyor, on which rests at least a product; - identifying in said first image series an initial image including the head end of said product considered in respect to said forwarding direction; - acquiring, through said image acquisition device, at least a second series of successive images showing said product moving forward along said forwarding direction, with an acquisition frequency so as to obtain, at said maximum transport speed, a partial overlapping of two successive images; - selecting, in said initial image and in each image of said second series of successive images showing said product, a recognition area; - estimating the displacement vector of the recognition area, selected in said initial image and in each image of said second image series, between the image where it was selected and an image following the one where it was selected; - identifying among the images of said second successive image series showing said product a final image containing the tail end of said product considered in respect to said forwarding direction; - processing the estimated displacement vectors and/or the acquired images of said product according to calculation and image processing algorithms to obtain at least a dimensional, geometrical or positional characteristic data of said product. - acquiring, through at least an image acquisition device placed crosswise to the forwarding direction of a continuous conveyor and at a distance from it, at least a first series of successive images showing a same area across which runs said continuous conveyor, on which rests at least a product; - identifying in said first image series an initial image including the head end of said product considered in respect to said forwarding direction; - acquiring, through said image acquisition device, at least a second series of successive images showing said product moving forward along said forwarding direction, with an acquisition frequency so as to obtain, at said maximum transport speed, a partial overlapping of two successive images; - selecting, in said initial image and in each image of said second series of successive images showing said product, a recognition area; - estimating the displacement vector of the recognition area, selected in said initial image and in each image of said second image series, between the image where it was selected and an image following the one where it was selected; - identifying among the images of said second successive image series showing said product a final image containing the tail end of said product considered in respect to said forwarding direction; - processing the estimated displacement vectors and/or the acquired images of said product according to calculation and image processing algorithms to obtain at least a dimensional, geometrical or positional characteristic data of said product.