METHOD FOR MEASURING THE GROWTH OF LEAF DISKS OF PLANTS AND APPARATUS SUITED THEREFOR
First Claim
1. A method for measuring the growth of leaf disks, comprising the following steps:
- a) calibrating a capture system and determining calibrating parameters of the capture system;
b) capturing at least one stereo image pair of a leaf disk using the calibrated capture system;
c) processing each capture image, comprising;
i) segmenting the leaf disks by threshold segmentation,ii) carrying out morphological erosion steps on the segmented images,iii) carrying out an edge cleaning to remove the edge of the storage vessel and detecting the edge of the leaf disk on the morphologically eroded images,d) determining the proiected leaf area AP of the leaf disk from the edge-claned imagese) carrying out a 3D reconstruction comprising;
generating a disparity image D by means of a stereo algorithm from the captured image pairs;
calculating a 3D surface model based on the previously determined calibration parameters from the disparity image;
f)smoothing the previously obtained surface model;
g) determining the 3D area A3D of the leaf disk from the smoothed surface modelh) repeating the image capture according to step b) at different timesi) generating time series of the determined areas by evaluating the images that were captured at different times in accordance with steps c-g)j) determining the growth rates of the leaf disk from the time series of the determined areas.
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Abstract
Disclosed is a method and an apparatus for measuring the growth of leaf disks. The method comprises the following steps: a) Calibrating the capture system, b) capturing at least 2 images of a leaf disk, c) processing the image data, comprising i) segmenting the leaf disks by threshold segmentation, ii) multiple morphological erosion steps, iii) edge cleaning to remove the edge of the storage vessel, d) 3D reconstruction: generating a disparity map by means of a stereo algorithm, calculating a 3D surface model based on the previously determined calibration parameters from the disparity map, e) smoothing the previously obtained surface model, f) determining the growth rates from the time series of the areas. The apparatus comprises at least one camera, a lighting unit, a translation table in the X/Y plane for the camera and (infrared) lighting, storage vessels for leaf disks, and electronic evaluation and control units.
14 Citations
17 Claims
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1. A method for measuring the growth of leaf disks, comprising the following steps:
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a) calibrating a capture system and determining calibrating parameters of the capture system; b) capturing at least one stereo image pair of a leaf disk using the calibrated capture system; c) processing each capture image, comprising; i) segmenting the leaf disks by threshold segmentation, ii) carrying out morphological erosion steps on the segmented images, iii) carrying out an edge cleaning to remove the edge of the storage vessel and detecting the edge of the leaf disk on the morphologically eroded images, d) determining the proiected leaf area AP of the leaf disk from the edge-claned images e) carrying out a 3D reconstruction comprising;
generating a disparity image D by means of a stereo algorithm from the captured image pairs;calculating a 3D surface model based on the previously determined calibration parameters from the disparity image; f)smoothing the previously obtained surface model; g) determining the 3D area A3D of the leaf disk from the smoothed surface model h) repeating the image capture according to step b) at different times i) generating time series of the determined areas by evaluating the images that were captured at different times in accordance with steps c-g) j) determining the growth rates of the leaf disk from the time series of the determined areas. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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7. (canceled)
Specification