<abstract xmlns="http://www.w3.org/1999/xhtml">

The study evaluated the possibility of using the image acquisition and processing method with ImageJ software for estimating growth vigor and flowering intensity of ‘Conference’ pear trees. For assessing flowering intensity, manual counting of flower clusters and taking of photographs of the trees were conducted at full bloom. Tree vigor was estimated by manually measuring the total length of the central leader and shoots of individual trees. The trees were photographed from the same distance using a hand-held camera. The calibration model for assessing the vigor or flowering of trees by image analysis was based on measurements and photographs taken for nine selected trees differing in the total length of shoots or in the number of flower clusters. Then, a quality assessment of the model was carried out on 26 nonselected trees. Image processing was performed using ImageJ software. High regression coefficients were obtained between the surface area of petals measured on the photographs and the number of inflorescences counted (r2 = 0.98); however, observations carried out in the following year indicate the need for individual calibration of estimation models in each evaluation season. Subsequently, the quality of estimating the flowering intensity of pear trees was assessed using a previously determined calibration model. Mean absolute percentage error (MAPE) values ranged from 14.0% to 21.8%, depending on the measurement time. In the assessment of tree growth vigor, a high correlation (r2 = 0.98) was also obtained between the actual length of shoots measured individually for each tree and the values obtained by analyzing the photographic image, where the MAPE error was 12.9%.
</abstract>

The study evaluated the possibility of using the image acquisition and processing method with ImageJ software for estimating growth vigor and flowering intensity of ‘Conference’ pear trees. For assessing flowering intensity, manual counting of flower clusters and taking of photographs of the trees were conducted at full bloom. Tree vigor was estimated by manually measuring the total length of the central leader and shoots of individual trees. The trees were photographed from the same distance using a hand-held camera. The calibration model for assessing the vigor or flowering of trees by image analysis was based on measurements and photographs taken for nine selected trees differing in the total length of shoots or in the number of flower clusters. Then, a quality assessment of the model was carried out on 26 nonselected trees. Image processing was performed using ImageJ software. High regression coefficients were obtained between the surface area of petals measured on the photographs and the number of inflorescences counted (r2 = 0.98); however, observations carried out in the following year indicate the need for individual calibration of estimation models in each evaluation season. Subsequently, the quality of estimating the flowering intensity of pear trees was assessed using a previously determined calibration model. Mean absolute percentage error (MAPE) values ranged from 14.0% to 21.8%, depending on the measurement time. In the assessment of tree growth vigor, a high correlation (r2 = 0.98) was also obtained between the actual length of shoots measured individually for each tree and the values obtained by analyzing the photographic image, where the MAPE error was 12.9%.

Application of ImageJ Software in the assessment of flowering Intensity and growth Vigor of Pear Trees

Journal of Horticultural Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The study evaluated the possibility of using the image acquisition and processing method with ImageJ software for estimating growth vigor and flowering...

Sampling date	MAE	MAPE
2015	6.11	21.8%
First measurement 2016	8.10	14.0%
Second measurement 2016	11.96	19.1%

Application of ImageJ Software in the assessment of flowering Intensity and growth Vigor of Pear Trees

Article Category: Short communication

Published Online: Dec 13, 2021

Page range: 85 - 94

Received: Jul 01, 2021

Accepted: Oct 01, 2021

DOI: https://doi.org/10.2478/johr-2021-0017

Keywords
image analysis, plant morphology

© 2021 Waldemar Treder et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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Values of absolute error in estimating the flowering intensity of pear trees based on image analysis (2015 and 2016)

Application of ImageJ Software in the assessment of flowering Intensity and growth Vigor of Pear Trees

Article Category: Short communication

Published Online: Dec 13, 2021

Page range: 85 - 94

Received: Jul 01, 2021

Accepted: Oct 01, 2021

DOI: https://doi.org/10.2478/johr-2021-0017

Keywordsimage analysis, plant morphology

© 2021 Waldemar Treder et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Values of absolute error in estimating the flowering intensity of pear trees based on image analysis (2015 and 2016)

Keywords
image analysis, plant morphology