A New Method for Extracting Individual Plant Bio-Characteristics from High-Resolution Digital Images
Abstract
:1. Introduction
2. Problem Statements
- to identify bounding boxes with no plants;
- to calculate accurate individual plant areas, despite overlap** adjacent plants;
- to calculate accurate individual plant NDVI values, despite overlap** adjacent plants;
3. Methods
3.1. Background Correction
3.2. Center Point Calculation
3.3. Extraction of Plant Areas
3.4. Extraction of NDVI Values
3.4.1. Finding the Overlap** Pixel Rows
3.4.2. Adjusting NDVI Values at Overlap** Pixel Rows
- the maximum and minimum NDVI values of the plant are first calculated, labelled as and ; respectively;
- the whole center row is updated and will be used as a reference for the adjustment of plant pixels at overlap** rows. The step size, which is the difference of NDVI values between two adjacent pixels, is calculated as:
- Let us take a symmetric reference vector, , such that The NDVI values are adjusted as following:
3.5. Testing of the Algorithm
4. Results and Discussions
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Image Time Point | Correlation | |
---|---|---|
Area of Rectangular Bounding Boxes | Area of Circular Plant Regions | |
9 May 2017 | 0.74 | 0.75 |
5 July 2017 | 0.30 | 0.74 |
11 September 2017 | 0.28 | 0.63 |
20 November 2017 | 0.30 | 0.66 |
Image Time Point | Correlation | ||
---|---|---|---|
Unadjusted NDVI from Rectangular Boxes | Unadjusted NDVI from Circular Plant Regions | Adjusted NDVI from Circular Plant Regions | |
9 May 2017 | 0.56 | 0.56 | 0.57 |
5 July 2017 | 0.55 | 0.58 | 0.59 |
11 September 2017 | 0.52 | 0.54 | 0.55 |
20 November 2017 | 0.51 | 0.53 | 0.56 |
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Rabab, S.; Breen, E.; Gebremedhin, A.; Shi, F.; Badenhorst, P.; Chen, Y.-P.P.; Daetwyler, H.D. A New Method for Extracting Individual Plant Bio-Characteristics from High-Resolution Digital Images. Remote Sens. 2021, 13, 1212. https://doi.org/10.3390/rs13061212
Rabab S, Breen E, Gebremedhin A, Shi F, Badenhorst P, Chen Y-PP, Daetwyler HD. A New Method for Extracting Individual Plant Bio-Characteristics from High-Resolution Digital Images. Remote Sensing. 2021; 13(6):1212. https://doi.org/10.3390/rs13061212
Chicago/Turabian StyleRabab, Saba, Edmond Breen, Alem Gebremedhin, Fan Shi, Pieter Badenhorst, Yi-** Phoebe Chen, and Hans D. Daetwyler. 2021. "A New Method for Extracting Individual Plant Bio-Characteristics from High-Resolution Digital Images" Remote Sensing 13, no. 6: 1212. https://doi.org/10.3390/rs13061212