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Volume 23 (1984)
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Volume 23, Issue 1
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1984 Volume 23 Issue 1 Pages 1
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
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1984 Volume 23 Issue 1 Pages 2-3
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
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Chung-Kyue KIM, Haruhisa SHIMODA, Toshibumi SAKATA1984 Volume 23 Issue 1 Pages 4-13
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSLineaments observed from a sattelite imagery are characterized by their positions, the directions and the lengths on a two dimensional space. By analysing their dominant direction, the frequency and the total length on a certain direction, systematic and statistical characteristics of groups of lineaments can be evaluated.
In this study, Hough transform was proposed as an efficient method for lineament analyses. The performance of this method was investigated using a lineament distribution map extracted from a Landsat imagery. As a result, Hough transform was proved to be very useful tool to make a Rose Diagram of trend-total length with a high degree of accuracy. The correlation coefficient between Rose Diagrams by the Hough transform and those by the actual data is more than 0.98.
Fourier transform is a similar method for lineament analyses. The performance difference between these two transform methods was also examined and compared.View full abstractDownload PDF (9885K) -
Kaoru NAKAGAWA, Ryoji OHBA, Keiichi TANAKA, Kazumi MURATA1984 Volume 23 Issue 1 Pages 14-23
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSA new normalization is employed to increase the reliability of correlation method for a distance measurement of a target, for instance grass-land, which has random and poor texture with low contrast of brightness. It is clarified that gain and bias-adjustment at A/D conversion of a stereo-pair pictures arise a problen to mislead the correlogram, and is shown theoretically that an adaptive normalization of the pictures is effective to solve the problem. A normalized cross-correlation (NCC) to obtain homologous points in the stereo-pair is derived by the new normalization. A practical methed employing a fast algorithm to calculate the NCC in real time is proposed, and it shows that the normalization time is independent of the number of data. Finally, the present method is applied to measure the horizontal distances using triangulation at 25 points on the landing-strip of the Miyanomori jump hill, and the profile of the landing-strip is reconstructed by result of the measurements. The specification of the experimental set-up is specially cared in order to realize a handy type range finder with real time ability by the present method. Data processing is carried on a mini-computer and results of the experiment show that the NCC is useful to find the true homologous points in noise-like-texture, and that the fast algorithm is adequate for real time data processing because the execution time of the NCC by the algorithm is one-tenth or less than that by ordinary methods.View full abstractDownload PDF (2986K) -
Chuji MORI, Susumu HATTORI, Ryoichi INNAMI, Hirokazu KUNIKANE1984 Volume 23 Issue 1 Pages 24-35
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSA drum scanning micro-densitometer or a drum scanner is commonly used as an input device for image processing by computers for the reason of high digitizing rate of images. But it should be certified beforehand to what degree of precision is capable of being obtained in the reproduced images when it is used in the field of photogrammetry or remote sensing, where high positional accuracy is required. For high speed digitizing performance may be reached at the cost of high positional accuracy.
This paper proposes a method of testing the positional accuracy of a drum scanner through a practical example. The positional accuracy is analysed in terms of positional repeatability and geometrical distortions. The respective procedures of the test are mentioned with underlying statistical method. Especially for separating uncorrelated noises from correlated signals in the geometrical distortions, the least squares filtering is adapted.View full abstractDownload PDF (1202K) -
Yoshiaki Takahashi1984 Volume 23 Issue 1 Pages 36-43
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSIn this paper, a method to evaluate Path-Radiance in Remote Sensing in the visible region is descrived. This method involves data acquiring, data processing and evaluation of Path-Radiance by using actual field data without the model atmosphere.View full abstractDownload PDF (1903K) -
Chuji MORI1984 Volume 23 Issue 1 Pages 44-55
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSSequential adjustment procedure is practically used for usual aerial triangulation in Japan and orientation elements in plotting instruments are quickly supplied by use of electronic computers. In this paper, nonlinear transformation is distinguished from Helmert transformation, and nonlinear transformation is only applied to correct a minor deformation. A strict solution, approximate solutions and approximate computation procedures are reviewed, then a suitable method of computation will be able to find out when it will be necessary to adjust photographs taken under various unusual conditions.View full abstractDownload PDF (1125K) -
[in Japanese]1984 Volume 23 Issue 1 Pages 59-63
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (613K) -
[in Japanese]1984 Volume 23 Issue 1 Pages 63
Published: February 29, 1984
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (101K)
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