When detecting an objective body from a taken image, a scene of the image is determined, and a parameter to be used in detecting the objective body is controlled according to result of determination. The sealing structure includes a seal that has a lip that extends in an axial direction to engage a radially extending surface on the sealing plate. At least some of the platforms have a scalloped flow surface including a bulge adjoining the pressure side and a bowl adjoining the suction side, aft of the leading edge, of the respective airfoils.