Many computer-aided-drawn architectural perspectives, typically of a building's exterior surface arrangement of tiling, sashed window panes, etc., far and near in monotonous succession, are detailed in full uniformly throughout the surface area, without the present consideration of any naturally better drawing in less detail of its more distant portions.
Pictures thus finished tend to give the viewer impressions of deficiency in expression of depth-and scale-effects and also an unnatural and inorganic texture all over a picture esp. in the case of a drawing lacking appropriate degree of omission in both detailing of attendant and distant scenes.
Accordingly, the current study aims to develop a suitable technique for CAD scenery perspectives with farther objects more or less omissively detailed than those nearer, depending on visual distance.
Herein first we try to account for how this issue is treated in artists' paintings and technicians' pieces of architectural scenery.
Subsequently, reference data are calculated e. g. for restraining the spacing of vertical line elements from being too close not to disturb the viewers' sense of perspective ; and lastly we propose quantitative indices of image outputting in multiple parallel lines and of coloration limit to distant scenery segments depending on their visual fadeaway.

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We describe“pseudo morphological operators”that overcome the limitation of dilation and erosion operators, which play important roles in mathematical morphology. By definition, these operators require infinite set operations to obtain results by its definition. But a computer can not execute infinite operations. With a“pseudo dilation operator”and a“pseudo erosion operator, ” set operations are performed at the intersection point of the original object and the ray from the viewpoint. In this way, results are obtained by finite set operations, and the visual image obtained is the same as that with conventional mathematical morphological operations.

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In the Department of Computer Science of Tokyo Kasei Gakuin Tsukuba Women's University Junior College Division, students study CAD as one of the special subjects for information processing . Some graduates from the Department of Computer Science find employment in CAD-related companies, every year.
After learning the general rules of drawing, students learn plotting with a computer and how to use information processing devices as a tool for data transfer through CAD education. Aiming at making paper cars with CAD and participating in a paper car race, students learn basics such as reading and drawing graphics. Students are told to plot with graphics software and to improve the plotting until optimal completion can be reached . In this class, students are instructed to make boxes, paper planes and cars, etc. from their developments. Students are made to feel the necessity of using CAD for the purpose of making paper models with CAD. And they learn graphics and CAD through collaboration and educational exchange in CAD class. Given the task of making a manual of paper cars, which will help other students in learning CAD later on, students are told to make a CAD operation manual. Students can acquire the effectiveness of graphics and CAD through their own experiences. This study presents an example of practical CAD education for female students not possessing knowledge of the basics of drawing.

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[in Japanese]

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