Method for analyzing a surface of a tyre, comprising: a) providing the tyre having said surface to be analyzed, wherein said surface has a pattern which consists of a scheme that is repeated, substantially equal thereto, in a plurality of positions; b) acquiring one or more digital images of a portion of the surface, said portion of the surface being selected in a manner such that said pattern in said surface portion comprises said scheme repeated a plurality of times; c) identifying a plurality of first regions of said one or more digital images, each first region corresponding to a respective sub-portion of the scheme, wherein each first region comprises a plurality of pixels characterised by respective relative coordinates in said first region; d) identifying a respective plurality of regions (305, 306) of said one or more digital images homologous to each first region, wherein each homologous region comprises a plurality of pixels characterised by respective relative coordinates in said homologous region and wherein a respective scheme sub-portion in each homologous region is substantially identical to said respective scheme sub-portion of said each first region; e) for each first region, calculating a model of the respective scheme sub-portion, said scheme sub-portion model being a digital image wherein each pixel is associated with an average value of values associated with the pixels of said each first region and of the respective homologous regions (305, 306) having the same relative coordinates of said each pixel, thus obtaining a plurality of calculated scheme sub-portion models; f) obtaining a model of said scheme in said surface portion by combining said calculated scheme sub-portion models. a) providing the tyre having said surface to be analyzed, wherein said surface has a pattern which consists of a scheme that is repeated, substantially equal thereto, in a plurality of positions; b) acquiring one or more digital images of a portion of the surface, said portion of the surface being selected in a manner such that said pattern in said surface portion comprises said scheme repeated a plurality of times; c) identifying a plurality of first regions of said one or more digital images, each first region corresponding to a respective sub-portion of the scheme, wherein each first region comprises a plurality of pixels characterised by respective relative coordinates in said first region; d) identifying a respective plurality of regions (305, 306) of said one or more digital images homologous to each first region, wherein each homologous region comprises a plurality of pixels characterised by respective relative coordinates in said homologous region and wherein a respective scheme sub-portion in each homologous region is substantially identical to said respective scheme sub-portion of said each first region; e) for each first region, calculating a model of the respective scheme sub-portion, said scheme sub-portion model being a digital image wherein each pixel is associated with an average value of values associated with the pixels of said each first region and of the respective homologous regions (305, 306) having the same relative coordinates of said each pixel, thus obtaining a plurality of calculated scheme sub-portion models; f) obtaining a model of said scheme in said surface portion by combining said calculated scheme sub-portion models.