In this study, the stereo vision without optical aid was explored concerning the following problems; the way we made stereo pictures, the way we saw stereo vision simply, and we observed the change of stereo vision. From the first of these above problems, we used central projection, right projection, and oblique projection. As for the second, stereo pictures were added like next: assumptive construction (e.g. to add simple solid like a cube.) : technical hand (e.g. to color the corresponding sides of two stereo pictures.) perspective comparison (e.g. to use circles of different size which are variable according to the distance.) As for the last we observed the variation of apparent size or shape which were affected by direction or distance.

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A straight line is given on the ground plane, and many straight lines, parallel to one another and at constant intervals, are on the same plane. Intersection points of them are at constant intervals. Perspective projection of the given straight line appears as total perspective. Perspective projection of these many straight lines becomes to a group of straight lines, each line passes a vanishing point on HL and their intervals in horizontal direction are constant. Then we get axometric scale of the given straight line from intersection points of the total perspective and the group of straight lines. We get also axometric scales both of a straight line parallel to the given straight line and of one in a differrent direction from the same many straight lines. If we use a drawing paper, on which HL and such a group of straight lines are printed, we can easily draw one or two vanishing point perspective images.

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This paper describes a method for displaying pictures or drawings by luster scanning method. An arbitrary picture film can be processed for a digital coding method which will minimize the number of code levels required to describe a picture.
Ordinary drawings or moire fringe photographs consist of binary data with “black” and “white”, where the code levels are limited within the two. An introduction of the partial differentiation through the Fast Fourier Transform has led to the calculation of moving the side band spectrum in the two-dimensional Fourier transform transmitted over the channel of luster scanning binary data series. For displaying the successively changing patterns equi-moving coordinates are dotted by a dot-printer machine which is better to draw such as scanned pictures than by a conventional computer aided drafting machine or X - Y plotter.
This method shows a good merit for displaying not only linear but also non-linear change phenomena in the engineering fields.

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