RGB to LAB¶

Convert image from RGB colorspace to LAB colorspace and split the channels.

rgb2gray_hsv(img, channel, device, debug=False)

returns device, split image (l, a, or b channel)

• Parameters:
  • img- Image to be converted
  • channel- Split 'l' (lightness), 'a' (green-magenta), or 'b' (blue-yellow) channel
  • device- Counter for image processing steps
  • debug- Default value is False, if True, RGB to LAB intermediate image will be printed
• Context:
  • Used to help differentiate plant and background
• Example use:
  • Use In VIS Tutorial

Original RGB image

import plantcv as pcv

# image converted from RGB to LAB, channels are then split. Lightness ('l') channel is outputed.

device, l_channel=pcv.rgb2gray_lab(img, 'l', device, debug=True)

Lightness channel image

import plantcv as pcv

# image converted from RGB to LAB, channels are then split. Green-Magenta ('a') channel is outputed.

device, a_channel= pcv.rgb2gray_lab(img, 'a', device, debug=True)

Green-Magenta channel image

import plantcv as pcv

# image converted from RGB to Lab, channels are then split. Blue-Yellow ('b') channel is outputed.

device, b_channel=pcv.rgb2gray_lab(img, 'b', device, debug=True)

Blue-Yellow channel image