A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees
To produce high-quality crops, not only excellent cultivation techniques but also accurate nutrient management techniques are important. In recent years, many nondestructive tools such as the chlorophyll meter “SPAD” and the leaf nitrogen meter “Agri Expert CCN” have been developed for measuring cro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/10/4636 |
| _version_ | 1797598363073380352 |
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| author | Xujun Ye Marin Kitaya Shiori Abe Fanxing Sheng Shuhuai Zhang |
| author_facet | Xujun Ye Marin Kitaya Shiori Abe Fanxing Sheng Shuhuai Zhang |
| author_sort | Xujun Ye |
| collection | DOAJ |
| description | To produce high-quality crops, not only excellent cultivation techniques but also accurate nutrient management techniques are important. In recent years, many nondestructive tools such as the chlorophyll meter “SPAD” and the leaf nitrogen meter “Agri Expert CCN” have been developed for measuring crop leaf chlorophyll and nitrogen contents. However, such devices are still relatively expensive for individual farmers. In this research, we developed a low-cost and small-size camera with built-in LEDs of several specific wavelengths for evaluating the nutrient status of fruit trees. A total of 2 camera prototypes were developed by integrating 3 independent LEDs of specific wavelengths (Camera 1: 950 nm, 660 nm and 560 nm; Camera 2: 950 nm, 660 nm and 727 nm) into the device. In addition, a simple software tool was developed to enable the camera to capture leaf images under different LED lighting conditions. Using the prototypes, we acquired images of apple leaves and investigated the possibility of using the images to estimate the leaf nutrient status indicator SPAD (chlorophyll) and CCN (nitrogen) values obtained using the above-mentioned standard tools. The results indicate that the Camera 1 prototype is superior to the Camera 2 prototype and can potentially be applied to the evaluation of nutrient status in apple leaves. |
| first_indexed | 2024-03-11T03:21:09Z |
| format | Article |
| id | doaj.art-21d6209f0a5540569c089fac121d20ac |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T03:21:09Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-21d6209f0a5540569c089fac121d20ac2023-11-18T03:10:16ZengMDPI AGSensors1424-82202023-05-012310463610.3390/s23104636A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit TreesXujun Ye0Marin Kitaya1Shiori Abe2Fanxing Sheng3Shuhuai Zhang4Faculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, JapanFaculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, JapanFaculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, JapanFaculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, JapanFaculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, JapanTo produce high-quality crops, not only excellent cultivation techniques but also accurate nutrient management techniques are important. In recent years, many nondestructive tools such as the chlorophyll meter “SPAD” and the leaf nitrogen meter “Agri Expert CCN” have been developed for measuring crop leaf chlorophyll and nitrogen contents. However, such devices are still relatively expensive for individual farmers. In this research, we developed a low-cost and small-size camera with built-in LEDs of several specific wavelengths for evaluating the nutrient status of fruit trees. A total of 2 camera prototypes were developed by integrating 3 independent LEDs of specific wavelengths (Camera 1: 950 nm, 660 nm and 560 nm; Camera 2: 950 nm, 660 nm and 727 nm) into the device. In addition, a simple software tool was developed to enable the camera to capture leaf images under different LED lighting conditions. Using the prototypes, we acquired images of apple leaves and investigated the possibility of using the images to estimate the leaf nutrient status indicator SPAD (chlorophyll) and CCN (nitrogen) values obtained using the above-mentioned standard tools. The results indicate that the Camera 1 prototype is superior to the Camera 2 prototype and can potentially be applied to the evaluation of nutrient status in apple leaves.https://www.mdpi.com/1424-8220/23/10/4636low-cost and small-size camerabuilt-in LEDspecific wavelengthsnutrient status evaluationfruit trees |
| spellingShingle | Xujun Ye Marin Kitaya Shiori Abe Fanxing Sheng Shuhuai Zhang A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees Sensors low-cost and small-size camera built-in LED specific wavelengths nutrient status evaluation fruit trees |
| title | A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees |
| title_full | A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees |
| title_fullStr | A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees |
| title_full_unstemmed | A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees |
| title_short | A New Small-Size Camera with Built-In Specific-Wavelength LED Lighting for Evaluating Chlorophyll Status of Fruit Trees |
| title_sort | new small size camera with built in specific wavelength led lighting for evaluating chlorophyll status of fruit trees |
| topic | low-cost and small-size camera built-in LED specific wavelengths nutrient status evaluation fruit trees |
| url | https://www.mdpi.com/1424-8220/23/10/4636 |
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