Analyze NIR Intensity¶
This function calculates the intensity of each pixel associated with the plant and writes the values out to a file. Can also print out a histogram plot of pixel intensity.
plantcv.analyze_nir_intensity(gray_img, mask, bins, histplot=False)
returns header of histogram, histogram data, analysis_images
- Parameters:
- gray_img - 8- or 16-bit grayscale image data
- mask - Binary mask made from selected contours
- bins - Number of class to divide spectrum into
- histplot - If True plots histogram of intensity values (default histplot = False)
- Context:
- Used to mask rectangular regions of an image
-
Example use:
-
Output Data Units:
- Bins - bin values based on number of bins set by user
- Signal Histogram - histogram of object pixel intensity values 0 (unsaturated) to 255 (saturated)
Original grayscale image
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 = "print"
# Caclulates the proportion of pixels that fall into a signal bin and writes the values to a file. Also provides a histogram of this data
hist_header, hist_data, analysis_images = pcv.analyze_nir_intensity(gray_img, mask, 256, histplot=True)
NIR signal histogram
Image with shape characteristics
Note: The grayscale input image and object mask can be used with the pcv.pseudocolor function which allows the user to pick a colormap for plotting.