All issues
Volume 64, Issue 2
Displaying 1-19 of 19 articles from this issue
- |<
- <
- 1
- >
- >|
-
H. MURASE2002 Volume 64 Issue 2 Pages 1-2
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2486K) -
2002 Volume 64 Issue 2 Pages 3b
Published: 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (177K) -
2002 Volume 64 Issue 2 Pages 3a
Published: 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (177K) -
Eiji INOUE, Muneshi MITSUOKA, Hideyuki KONYA2002 Volume 64 Issue 2 Pages 4-8
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2558K) -
Koichiro FUKAMI, Masami UENO2002 Volume 64 Issue 2 Pages 9-13
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4274K) -
Takashi OKAYASU, Shingo OZAKI, Satoshi TAKEDA2002 Volume 64 Issue 2 Pages 14-17
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (6401K) -
Masami UENO2002 Volume 64 Issue 2 Pages 18-22
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (6180K) -
M. TANAKA2002 Volume 64 Issue 2 Pages 23-25
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3753K) -
Vision-Based Navigation for Straight RunningMasahiko SUGURI, Eiji MORIMOTO, Mikio UMEDA2002 Volume 64 Issue 2 Pages 49-55
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe unmanned transportation system will play an important role for lager scale farming. The control system of a transportation vehicle, traveling autonomously on farm road, has been developed based on image processing. The objective of this research is detecting the boundary lines between farm road and farm field. The XYZ image data was applied for boundary line detection between farm road and field. The method consisted of “Whole image processing” which was useful for line detection method before the vehicle running, in order to know its last position and orientation, and “Limited image processing” which was useful for the boundary line detection during the vehicle running based on the previous boundary line parameters. As the result of running test, limited image processing could detect the boundary lines at 10.1Hz and the prototype could run on a 100m straight farm road.View full abstractDownload PDF (6668K) -
Obstacle detection for collision avoidanceEiji MORIMOTO, Masahiko SUGURI, Mikio UMEDA2002 Volume 64 Issue 2 Pages 56-61
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSOne of the major challenges in designing autonomous transportation vehicles on farm road is reliable obstacle detection. In this study, HSI values were used for obstacle detection parameter and a smoothing filter, binarize method, clustering were applied for the obstacle detection. A coordinate transformation was used for the distance information detection between the vehicle and the obstacle. As a result of the field test, the developed system could detect obstacles with a 0.4m maximum error at 5.9frame/s.View full abstractDownload PDF (7458K) -
Construction of Steering Controller Considering Geomagnetic WarpAkira MIZUSHIMA, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO, Osamu YU ...2002 Volume 64 Issue 2 Pages 62-70
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this research is to develop an automatic guidance system based on sensor fusion of a geomagnetic direction sensor (GDS) and a gyroscope. From the first report, it was confirmed that an accurate automatic navigation by a fixed desired heading direction was very difficult because of a temporal and spatial geomagnetic variation and a drift error of a gyroscope. In this study, we proposed the dynamic compensation method against both a geomagnetic warp and a gyro drift by constructing the adaptive guidance system. From the computer simulation, the accuracy of sensor fusion guidance system improved about 70% compared with the GDS alone. To evaluate robustness of the developed system, a field test using the developed guidance system was carried out. From the test, the accuracy and robustness of the guidance system improved by utilizing the proposed sensor fusion method using the GDS and the gyroscope.View full abstractDownload PDF (3340K) -
Detection of Radish Seedling Using Automatic Thresholding MethodShu-huai ZHANG, Teruo TAKAHASHI, Hiroshi FUKUCHI, Kouichi SAGA2002 Volume 64 Issue 2 Pages 71-77
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this research is to develop an automatic system for thinning out radish seedlings. In part 1, we discussed a new cultivation method and the best time for thinning out, suited to automatic system. This paper proposed an algorithm how to determine which radish seedling should be thinned out. The approach, based on the OTSU's automatic thresholding method, was firstly applied to acquire the binary images, using the information of ExG (Extra Green) and brightness of radish seedling images. Secondly, we took a projection of the binary image onto horizontal X direction, particularly calculated the summation of binary image's pixels on the vertical Y direction. And then using the summation, the radish seedlings that should thin out, are determined. Finally, the experiments performed on 439 radish seedling images taken from the field, showed the proposed algorithm is effective for about 97% of total images.View full abstractDownload PDF (9168K) -
Kenji IMOU, Takenari SASAKI, Tsuguo OKAMOTO, Yutaka KAIZU2002 Volume 64 Issue 2 Pages 78-83
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the purpose of saving labor and improving safety in farm operations conducted with a pair of vehicles, automatic driving systems of the following or preceding vehicle have been studied. These systems require real-time and precise measurement of the relative position of vehicles. The authors propose a relative position detection system using diffuse light from LEDs. In the first stage of this study, a range-finder was developed and tested, consisting of two stations which emit high-frequency modulated light at each other. The range between the stations is obtained from the phase difference between the two low-frequency beat signals generated in both stations. Performance tests were conducted under direct sunshine, and the maximum and standard errors from the regression values were about 5 and 3cm respectively in the range from 1 to 10m.View full abstractDownload PDF (2815K) -
Yoshinari MORIO, Yoshio IKEDA2002 Volume 64 Issue 2 Pages 84-92
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSHolstein cow identification is very important from points of pedigree registration, artificial insemination, livestock hygiene and food safety control. Earmark identification system is often used in Western countries and Japan. In this study, a black and white pattern identification system using image processing was investigated as an easier and more effective identification system. 20 Holstein cows could be identified perfectly using Euclid distance for their patterns matching in an eigen space which was constructed by Karhunen-Loeve expansion, however, assuming that cow's posture and illumination was invariable in this experiment. After two degree counterclockwise rotation of cow's posture in a computer, their cows could not be identified perfectly. The identification algorithm must be improved to be robust to the relative posture change between cow and camera.View full abstractDownload PDF (1756K) -
Masaki TERAWAKI, Takashi KATAOKA, Hiroshi OKAMOTO, Shun-ichi HATA2002 Volume 64 Issue 2 Pages 93-101
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe distinction between sugar beet and three kinds of weeds, green amaranth, wild buckwheat and field horsetail, were tried based on the shape characteristics using the image processing technique. This would be applied to the development of the automatic thinner and weeding machine system for the direct sowing sugar beet. The linear discriminant function, which was based on the six shape characteristics, was produced for the distinction. The correct distinction rate of sugar beet was 85.7%, however, there were distinction errors of sugar beet as green amaranth and wild buckwheat as sugar beet. These error rates resulted in 11.3% and 13.6%, respectively. New characteristics of the angle of the leaf tip portion were introduced to reduce errors. The final results showed that the correct distinction rate of sugar beet was 87.2% and the error was reduced to less than 8%.View full abstractDownload PDF (3902K) -
Enhancement of Turning Accuracy by Creating Path applied with Motion ConstraintsMichio KISE, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO2002 Volume 64 Issue 2 Pages 102-110
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTurning algorithm for a robot tractor was developed in this paper. Two types of turning paths were created by applying third-order Spline function; forward turning, and switch-back turning. The constraints relating to the tractor characteristics, minimum turning radius and maximum steering speeds, were introduced for creating a feasible turning path. The turning path was recalculated while created path wasn't fulfilled these constraints.
Validity of the constraints was confirmed by a computer simulation. The developed algorithm was tested in the field with the robot tractor developed in a previous paper, and it showed higher following accuracy in comparison to conventional method.View full abstractDownload PDF (1484K) -
Shigemi HIDAKA2002 Volume 64 Issue 2 Pages 111-116
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the steering control system of combines, a driving feeling is produced via the steering wheel by using a forced differential system that drives the differential gear by force. This system has two hydrostatic transmissions for traveling and turning and can make various turning radii along the steering wheel angle by making differential revolution using a planetary gear drive. This paper describes some problems that occur when the forced differential system is used for crawler vehicle, such as combine.View full abstractDownload PDF (888K) -
Shigemi HIDAKA2002 Volume 64 Issue 2 Pages 117-121
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA simple steering control system using a forced differential system for crawler vehicles when abnormal steering operations occur is described turning radii differ when the moving speed changes, and the turning direction differs from moving forward to backward.
To produce steering feeling, it is necessary to build computing functions into the steering control system.
This paper reports on a steering control system that generates steering feeling by using a conical linkage system, which connects the slope of the conical bottom surface to the movement of the lever, and changes the steering wheel stroke to the revolution of the conical bottom circumference. This system is based on the rule that the distance from the top point of a cone to any point on the conical bottom circumference is equal.View full abstractDownload PDF (774K) -
Prototype of a Gantry and Its Application to the Disease Control, Harvesting WorkJun YAMASHITA, Shoichi YUKI, Seiichi ARIMA, Isao MATSUMOTO, Takashi TS ...2002 Volume 64 Issue 2 Pages 122-130
Published: March 01, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to save labor in strawberry cultivation, two types of gantries, for a single-span greenhouse and a wide-span greenhouse, a fungicide sprayer and workbenches for picking operation were manufactured and tested. Furthermore, a simple hand truck to transfer the gantry to a neighboring ridge in the multi-span greenhouse was made. From the results of spraying experiments, it was observed that the gantries could accomplish effective spraying with less fungicide consumption and the necessary time was reduced to 58% compared with manual spraying. In addition, physical burden for picking operation was decreased by using the workbench.View full abstractDownload PDF (3498K)
- |<
- <
- 1
- >
- >|