Apparatus for checking tyres in a tyre production line, the apparatus comprising: - a detection system comprising a linear camera having an objective line lying on an optical plane passing through the linear camera ; - a first light source , a second light source and a third light source adapted to respectively emit a first, a second and a third light radiation in order to illuminate a linear surface portion of a tyre coinciding with or in proximity to said objective line ; - a command and control unit configured for: - selectively activating at least one from among said first light source , second light source and third light source and - activating said linear camera in order to acquire a respective two-dimensional image of said linear surface portion synchronously with the activation of said at least one from among said first light source , second light source and third light source , wherein said first light source and second light source respectively lie on opposite sides with respect to said optical plane , wherein the apparatus comprises a support for said tyre , wherein each of said first light source , second light source and third light source comprises one or more respective sub-sources , each having a respective main extension direction which forms, with said optical plane , an angle smaller than or equal to 45° and wherein the distance of said sub-sources of the third light source from said optical plane is less than the distance of said first light source and second light source from said optical plane , wherein said third light source is adapted to illuminate said objective line with diffuse light, wherein said third light source comprises at least four respective sub-sources distributed on both sides of said optical plane , wherein said sub-sources of said third light source are symmetrically distributed with respect to said optical plane , wherein said sub-sources of the first light source , second light source and third light source are arranged along a line (115; 117) on a reference plane orthogonal to the objective line having concavity directed towards the objective line, said sub-sources being equidistant from said objective line or said sub-sources being arranged as a triangle with vertex on the optical plane , and wherein for each point (P) of the objective line , a respective angle having vertex at the point (P) and lying in a reference plane orthogonal to the objective line , and subtended by said third light source , is greater than or equal to 70°. - a detection system comprising a linear camera having an objective line lying on an optical plane passing through the linear camera ; - a first light source , a second light source and a third light source adapted to respectively emit a first, a second and a third light radiation in order to illuminate a linear surface portion of a tyre coinciding with or in proximity to said objective line ; - a command and control unit configured for: - selectively activating at least one from among said first light source , second light source and third light source and - activating said linear camera in order to acquire a respective two-dimensional image of said linear surface portion synchronously with the activation of said at least one from among said first light source , second light source and third light source , <EOS>