gnuplot - octave/ gnuplot - Plot RGB pixel intensities

Question

I am trying to read an input image using octave and plot its RGB values as a 3 dimension plot.

I am reading image using

im = imread('image')

How can I plot this?

Also, is it possible to plot a histogram of all the 3 layers?

Thanks

Answer 1

如前所述，Octave API 文档为您提供了图像的 MxNx3 矩阵数据集。

R/G/B 通道是im矩阵的最后一个维度。hist需要一维输入，因此我们需要对其进行重塑：

hist(reshape(im(:,:,1),1,[])) # red
hist(reshape(im(:,:,2),1,[])) # green
hist(reshape(im(:,:,3),1,[])) # blue

关于 3D 图：您是指3D 散点图吗？那么 Octave 的scatter3可能会对您有所帮助。