Corresponding point searching is the most important process at the passive stereo measurement. At the long-range target, the number of pixels of binarized target marker images are sometimes few, concretely about 100 pixels. In this case, the fluctuation of the coordinate of the corresponding points is possibly appeared. We have been studying long-range outdoor measurements by the high-precision passive stereo to detect the small movement of the land for the disaster prevention. For this application, the stability of measurement results is required to avoid the mistake alert.
In this paper, we discuss the fluctuation in detail using several shapes, sizes and rotation conditions. Also, we found the condition that showed outliers which must be avoided for the image measurement. As a result, the circle, the most popular marker shape, sometimes shows more outliers than some of the other shapes such as the slightly rotated square marker.
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