Details of a Researcher - HIYOSHI Kenji

Papers - HIYOSHI Kenji

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Study on Strawberry Harvesting Bobot Using Machine Vision for Strawberry Grown on Annual Hill Top (Part 2) Reviewed

Journal of the Japanese Society of Agricultural Machinery 69 ( 2 ) 60 - 68 2007.3

Language：Japanese Publishing type：Research paper (scientific journal)

Study on Strawberry Harvesting Robot Using Machine Vision for Strawberry Grown on Annual Hill Top (Part 2) : Ripeness Judgment and Recognition of Peduncle Using Picking Camera, and Fabrication of the Picking Hand

CUI Yongjie, NAGATA Masateru, GUO Feng, HIYOSHI Kenji, KINOSHITA Osamu, MITARAI Masafumi

Journal of JSAM 69 ( 2 ) 60 - 68 2007.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

This paper was carried on a strawberry harvesting robot which can precisely harvest the fruit without damage through cutting and holding the peduncle for strawberries grown on annual hill tops. This second study proposed an image processing method for the ripeness judgment of fruits and the recognition of the peduncle, and described the fabrication of the picking hand. The ripeness judgment of fruits was based on the fruit's coloring rate to determine their proper harvesting timing. The peduncle recognition involves extraction of the display line of peduncle, as well as determination of its cutting position and direction angle. Results confirmed that the harvestable fruits having at least 50 to 60% coloring were able to be determined, while the cutting position and direction angle of the peduncles can be obtained. From the information provided by the image processing method, the picking hand's ability to cut and hold the harvestable fruits through their peduncle was confirmed.

DOI： 10.11357/jsam1937.69.2_60

CiNii Research

農用トラクタの実作業における排出ガスの実態に関する研究

積栄, 日吉健二

農業機械學會誌 67 ( 3 ) 2005.5

Language：Japanese Publishing type：Research paper (scientific journal)

CiNii Research

Judging of tomato maturity by utilizing a low-resolution RGB color system

Gejima Y., Nagata M., Kenji H.

ASAE Annual International Meeting 2004 7045 - 7053 2004.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ASAE Annual International Meeting 2004

On the image processing of personal computer, the RGB color system has the most closely index color map (16.77 million index, 24bit) compared to the other (L*a*b* or HSV etc.) color system. Therefore RGB index values are used in the other color system formula. This study determines a method for higher accuracy judgment by the RGB color system for the index color of tomato maturity. The correlation coefficient between the relationship of tomato maturity and the histogram in 24bit color index map in RGB color system was 0.6202, when it was showed under the index of R=141, G=60 and B=50. The judgment accuracy for using this linear formula was about 50%. Then, when the percentile of histogram of tomato area was used, the correlation coefficient was increased to 0.6225. This reason was affected by the size of tomato. Moreover, we thought that the RGB 24bit color map was too much, thus a lower bit color map was used this analysis. The highest correlation coefficient was obtained 0.9202 in 64 colors(12bit). This result was clearly showed that the group color is better than mono color. Therefore, other color system which has lower color map, were compared to a 15bit color index map on the RGB color system.

Scopus

イチゴ収穫ロボット開発のための遠撮カメラによる:イチゴ果実の画像および位置認識

永田雅輝, 崔永杰, 小林太一, タラダジャスパ, 日吉健二, 槐島芳徳

農業機械学会誌 66 ( 0 ) 89 - 90 2004

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

DOI： 10.11357/jsam1937.66.Supplement_89

CiNii Research

釜炒り茶における炒り葉評価システムの開発に関する研究 (第4報):市販の連続式炒り葉機における解析

槐島芳徳, 永田雅輝, 日吉健二, 藤田進, 松尾啓史

農業機械学会誌 66 ( 0 ) 211 - 212 2004

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

DOI： 10.11357/jsam1937.66.Supplement_211

CiNii Research

農用トラクタの実作業における排出ガスの実態に関する研究（第1報）圃場作業の再現運転による排出ガス質量の推定と実態調査 Reviewed

積　栄，落合良治，髙橋弘行，古山隆司，日吉健二

農業機械学会誌 65 ( 6 ) 120 - 126 2003.11

Language：Japanese Publishing type：Research paper (scientific journal)

農用トラクタの実作業における排出ガスの実態に関する研究（第2報）作業方法による排出ガスの低減法の検討 Reviewed

積　栄，落合良治，髙橋弘行，古山隆司，日吉健二，遠藤　準

農業機械学会誌 65 ( 6 ) 127 - 133 2003.11

Language：Japanese Publishing type：Research paper (scientific journal)

Studies on Exhaust Gas of Agricultural Tractors on Field Work (Part 1) : Estimation of the Actual Situation of the Amount of exhaust Gas by Reproduction of Field Work

SEKI Ei, OCHIAI Yoshiji, TAKAHASHI Hiroyuki, FURUYAMA Takashi, HIYOSHI Kenji

Journal of JSAM 65 ( 6 ) 120 - 126 2003.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

The solution for the problem of exhaust gas from diesel engines has become more important these days, and some improvement is to be needed also on agricultural machineries. Therefore it is important to observe the actual situation of the exhaust gas amount of agricultural tractors on field work. On this report, rotary tillage was considered, which is the most popular work in Japan. To obtain the amount of exhaust gas, PTO Load on rotary tillage was recorded and reproduced with the PTO performance test system in the laboratory. PTO load and PTO speed were correctly reproduced on this system, and the tendency of the results of exhaust gas density by the system was the same as the real ones on the field, which means the reproduction of PTO load by the system is proper from the view of exhaust gas. By the reproduction, the exhaust gas amount of tractors was investigated on rotary tillage, and it supposed that the amount of exhaust gas per kWh varies with various required PTO power.

DOI： 10.11357/jsam1937.65.6_120

CiNii Research

Studies on Exhaust Gas of Agricultural Tractors on Field Work (part 2) : Investigation of the Reduction Method of Exhaust Gas Amount by Consideration of Operation

SEKI Ei, OCHIAI Yoshiji, TAKAHASHI Hiroyuki, FURUYAMA Takashi, HIYOSHI Kenji, ENDOH Jun

Journal of JSAM 65 ( 6 ) 127 - 133 2003.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

The exhaust gas amount of tractors on rotary tillage has been estimated by means of the reproduction method of the actual work on the report part 1 to observe the situation of the exhaust gas on actual field work. On this report, the relation between the exhaust gas amount and the condition on field work, such as PTO load and engine speed was investigated. To understand the relation, the amount of exhaust gas from the actual rotary tillage with various traveling speed and engine speed was estimated, and the changes of estimated C1 mode test results (which represents the amount of exhaust gas from general work of non-road engine) by varying PTO load and engine speed was also considered. As a result, it was made clear that every tractor has its own tendency of changing the amount of exhaust gas by varying PTO load and engine speed, and it seemed possible to decrease each exhaust gas component by considering the tendency and selecting the suitable PTO load and engine speed.

DOI： 10.11357/jsam1937.65.6_127

CiNii Research

精密除草システムのための基礎的研究:画像によるニンジンの作物列検出について

日吉健二, 高橋由浩, 槐島芳徳, 永田雅輝

農業機械学会誌 65 ( 0 ) 13 - 14 2003

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers

DOI： 10.11357/jsam1937.65.Supplement_13

CiNii Research

イチゴの収穫システムの開発に関する研究 (第3報):高さ情報検出の理論について

永田雅輝, 槐島芳徳, 日吉健二, 崔永杰

農業機械学会誌 64 ( 0 ) 177 - 178 2002

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Agricultural Machinery and Food Engineers