Otsu Auto Threshold¶
Creates a binary image from a gray image based on the threshold values.
plantcv.threshold.otsu(gray_img, object_type="light")
returns thresholded/binary image
-
Parameters:
- gray_img - Grayscale image data
- object_type - "light" or "dark" (default: "light"). If object is lighter than the background then standard thresholding is done. If object is darker than the background then inverse thresholding is done.
-
Context:
- Used to help differentiate plant and background
Grayscale image (green-magenta channel)
from plantcv import plantcv as pcv
# Set global debug behavior to None (default), "print" (to file),
# or "plot" (Jupyter Notebooks or X11)
pcv.params.debug = "plot"
# Create binary image from a gray image based on threshold values.
# Targeting dark objects in the image.
threshold_dark = pcv.threshold.otsu(gray_img=gray_img, object_type='dark')
Thresholded image
Grayscale image (blue-yellow channel)
# Create binary image from a gray image based on threshold values.
# Targeting light objects in the image.
threshold_light = pcv.threshold.otsu(gray_img=gray_img, object_type='light')
Thresholded image (inverse)
Source Code: Here