Stereo scopic photogrammetry is the method to measure the three dimensional position of a subject by two cameras in usual. But in this paper a modified new method is illustrated. In this system a camera and a slide projector are used instead of two cameras. A projector projects a pattern of grid on the subject and a camera takes the projected pattern as a film image. Thus the XYZ value of the subject can be calculated by coordinates measured on the correspondent points on both films analytically. This method is specially devised to measure the flat surface with flat tone as human body.
Various kinds of analytical aerial triangulation procedures have been developed and used in practical routine works, which are different each other in their details such as the configuration and numbers of pass points in a model. As a step to the trial of standardization of them, a statistical study on the difference of the error distribution for the residual y-parallax P's, and the closing error V which are computed from P's with the equation (2-3), was tried. 7 projects by 4 different agencies, including GSI, are selected for comparison, and the distribution pattern of P's shows rather normal pattern similar to the normal distribution, but V-distribution shows a considerable anomaly from the normal distribution. To ascertain these results, kai-square test for P's and V, and computation of the correlation coefficients among the residual P's for each 6 pass points, have been carried out. The results of kaisquare test for P's have shown no significant deviations from the normal distribution, and also shown rather weak correlation between them except several cases, where the relative orientation is computed using only 6 pass points. On the other hand, the results for V showed a big values of kai-spuare for almost all cases, and it seems to be reasonable to conclude the non-normal distribution pattern for V. It looks like as partly having a distribution pattern of sin ax/x, which might cause from the interference effect of granuity of sensitive emulsion on the film, functioning as a low pass filter for the two dimensional spacial frequency of the photo image. Further study shall be make clear the cause of these irregular distributions.
An automatic drafting of topographical map is attempted in this study, and will be a first step of automation of aerial photo survey. The possibility of this method was searched for by combining nowaday hardware and software, and checked by an experiment. This method will be able to fully practicable by partial improving.
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