Successively Approximate Orientation in Two-Medium Photogrammetry
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概要
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A practical method of exterior orientation of a stereopair in two-medium photogrammetry is proposed. An important and difficult problem in two-medium photogrammetry is to reconstruct the space model of the photographed object by the projectors of stereoscopic plotting instruments. Even if the stereopair is projected in correct perspective position, the corresponding rays issuing from the photographs do not intersect. The corresponding rays intersect only after refracting at the interface of two media, similar to the object space.<BR>The proposed method consists of two phases, relative and absolute orientation, in order to be able to utilize stereoscopic plotting instruments generally used. The residual <I>y</I>-parallaxes which should be appear in directly projected corresponding rays are computed at first. The relative orientation of the stereopair is, thereafter, carried outso as to leave these <I>y</I>-parallaxes. In this case, only five exterior orientation elements are used notwithstandding that eight elements are theoretically necessary to reconstruction of the model. The remaining seven exterior orientation elements are determined by absolute orientation. In this phase, one has to point out that the true position of control points can not be found directly by the plotting instruments. Therefore, an alternative method should be applied: The one is that imaginary apparent positions of given control points are computed and used for absolute orientation, and the another is that observed apparent positions are converted into the true positions by computation and these positions are compared with the given positions of the control points. The former is adopted in the present paper.<BR>Successively approximate procedure is necessary in this method of orientation because both relative and absolute orientation are not correct from a theoretical point of view. Accuracy and characteristics of the proposed method are investigated by computation for typical examples. Denoting the Hight of camera from the submerged object by <I>H</I> and water depth by <I>Hw</I>, sufficient accuracy is obtained by only the first orientation within the limit of <I>Hw/H</I><0.95. If the orientation procedure is repeated once more, fairly good result can also be obtained for the casees of greater <I>Hw/H</I>.
- 社団法人 日本写真測量学会の論文
社団法人 日本写真測量学会 | 論文
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