PROBLEM TO BE SOLVED: To provide a distance estimator for passively estimating the distance to a target in an image by collating image information including the target and the distance to which is wanted to estimate with a shape model including size information on a real size corresponding to the target and the distance to which is wanted to estimate.
SOLUTION: An operator operates an operation part 1104 while watching a display part 1103 to collate the target in an image and the distance to which is wanted to estimate, the image being obtained from an image information acquisition part 1101, with the shape model including the size information on a real size corresponding to the target previously held by a model data part 1102. Image information obtained from the acquisition part 1101 at a collation ending time point and shape model information obtained from the data part 1102 are input into a distance calculation part 1105 to estimate the distance to the target.
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