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| 1 | The Machine Recognition for Population Feature of Wheat Images Based on BP Neural Network显示文摘Recognition and analysis of dynamic information about population images during wheat growth periods can be taken for the base of quantitative diagnosis for wheat growth. A recognition system based on self-learning BP neural network for feature data of wheat population images, such as total green areas and leaves areas was designed in this paper. In addition, some techniques to create favorable conditions for image recognition was discussed, which were as follows: (1) The method of collecting images by a digital camera and assistant equipment under natural conditions in fields. (2) An algorithm of pixei labeling was used to segment image and extract feature. (3)A high pass filter based on Laplacian was used to strengthen image information. The results showed that the ANN system was availability for image recognition of wheat population feature. | LI Shao-kun, SUO Xing-mei, BAI Zhong-ying, QI Zhi-li, Liu Xiao-hong, GAO Shi-ju and ZHAO Shuang-ning( Institute of Crop Breeding and Cultivation /Key Laboratory of Crop Genetic & Breeding, Ministry of Agriculture, ChineseAcademy of Agricultural Sciences, Beijing 100081 , P . R . China Department of Computer Science and Technology, CentralUniversity for Nationalities, Beijing 100081 , P. R . China School of Computer Science and Technology, Beijing Universityof Posts and Telecommunications, Beijing 100876, P. R . China Research Center of Xinjiang Crop High-yield,Shihezi University, Shihezi 832003, P.R. China) | 2002 | Agricultural Sciences in China2002，1，8： | 4 |
| 2 | 1982, Beginning to learn foreign vocabulary: A review of the research 显示文摘 | Nation I S P | 1982 | RELC Journal1982，131，： | 1 |
| 3 | A vocabulary size test of controlled productive ability 显示文摘 | Laufer B Nation P | 1999 | Language Testing1999，16，1： | 1 |
| 4 | Expert panel report 3(EPR-3): guidelines for the Diagnosis and management of asthma-summary report 2007显示文摘 | National Asthma E Prevention P | 2007 | J Allergy C1in hnmunol2007，120，5： | 1 |
| 5 | Fluency Improvement in a Second Language显示文摘 | AREVART S NATION P | 1991 | Regional Language Center1991，8495，： | 1 |
| 6 | Learning vocabulary in lexical sets : Dangers and guidelines 显示文摘 | Nation I S P | 2000 | TESOL Journal2000，，9： | 1 |
| 7 | What vocabu- lary size is needed to read unsimplified texts for pleasure 显示文摘 | Hirsh D Nation P | 1992 | Reading in a For- eign Language1992，，2： | 1 |
| 8 | Factors affecting guessing vocabulary in context 显示文摘 | Liu N & Nation I S P | 1985 | RELC Journal1985，，16： | 1 |
| 9 | Vocabulary Size and Use: LexicalRichness in L2 Written Production 显示文摘 | Laufer B Nation P | 1995 | AppliedLinguistic1995，，3： | 1 |
| 10 | Word families显示文摘 | Nation P | 1993 | International Journal of Lexicography1993，，3： | 1 |
| 11 | The language learning benefits of extensive reading 显示文摘 | Nation P 1997 | 1997 | The Language Teacher1997，215，： | 1 |
| 12 | 'Vocabulary size and use: lexical richness in L2 written production' 显示文摘 | Nation P & Laufer B | 1995 | Applied Linguistics1995，16，7： | 1 |
| 13 | Vocabulary,Size Test of Controlled Productive Knowledge显示文摘 | | 1998 | Language Testing1998，17，： | 1 |
| 14 | What vocabulary size is needed to read unsimplified texts for pleasure? 显示文摘 | Hirsh D Nation P | 1992 | Reading in a Foreign Language1992，，8： | 1 |
| 15 | Graded readers and vocabulary 显示文摘 | Nation P & Wang K M T | 1999 | Reading in a Foreign Langnage1999，，12： | 1 |
| 16 | How large a vocabulary is needed for reading and listening? 显示文摘 | Nation I S P | 2006 | Canadian Modern Language Review2006，63，1： | 1 |
| 17 | Vocabulary learning and reading 显示文摘 | Saragi T Nation I S P & Meister G F | 1975 | System1975，，6： | 1 |
| 18 | Word families 显示文摘 | Bauer L & Nation P | 1993 | International Journal of Lexicography1993，6，4： | 1 |
| 19 | Unknown Vocabulary Density and Reading Comprehension显示文摘 | HU M NATION I S P | 2000 | Reading in a Foreign Language2000，13，1： | 1 |
| 20 | Symmetric and Asymmetric Mode Interaction in High-Power Travelingwave Amplifiers:Experiments and Theory显示文摘 | Wang P S Xu Z National J A | 2000 | IEEE Trans on Plasma Science2000，28，6： | 1 |
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