RGB to HSV and thresholding
This example illustrates how RGB to HSV (Hue, Saturation, Value) conversion can be used to facilitate segmentation processes.
using Images, TestImages, LinearAlgebra rgb_img = testimage("lighthouse") hsv_img = HSV.(rgb_img) channels = channelview(float.(hsv_img)) hue_img = channels[1,:,:] value_img = channels[3,:,:] saturation_img = channels[2,:,:]
A simple segmentation of the image can then be effectively performed by a mere thresholding of the HSV channels.
mask = zeros(size(hue_img)) h, s, v = 80, 150, 150 for ind in eachindex(hue_img) if hue_img[ind] <= h && saturation_img[ind] <= s/255 && value_img[ind] <= v/255 mask[ind] = 1 end end binary_img = colorview(Gray, mask)
The obtained binary image can be used as a mask on the original RGB image.
segmented_img = mask .* rgb_img hcat(rgb_img, binary_img, segmented_img)
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