1. A stereo picture generating device comprising: a feature point extracting unit that extracts a plurality of feature points from a first picture generated by photographing an object from a first position; a tracking unit that calculates coordinate of each point on a second picture generated by photographing the object from a second position different from the first position corresponding to each of the plurality of feature points, wherein each of the plurality of the feature points and the corresponding point on the second picture correspond to a same point on the object; a parameter determining unit that determines plane projective transformation coefficients which include at least one coefficient representing a rotational transfer component and at least one coefficient representing a translation component so as to minimize an evaluation value that includes distance between each of transformed feature points, which are obtained by plane-projective-transforming the feature points on the first picture by using the plane projective transformation coefficients, and the corresponding point on the second picture and a weighting term having a value depending on the rotational transfer component; and a transforming unit that plane-projective-transforms the first picture by using the plane projective transformation coefficients, to generate a pair of plane-projective-transformed picture and the second picture as a stereo picture.