CODEWITHSUNDEEP
matplotlibjulia
AnOnion
AnOnion

Reputation: 45

Converting a column-major array for use in a PyPLot histogram

I'm trying to do some basic image analysis with Julia after observing how much faster it is than Python.

There are good examples out there of how to import a file in using the Images library. Images reinterprets it then hist changes it to a column-major vector.

using Images
img_gld = imread("image.jpg")
img_gld_gs = convert(Image,img_gld)
img_gld_gs = reinterpret(Uint8,data(img_gld_gs))
import PyPlot
h = PyPlot.plt.hist(vec(img_gld_gs), -1:255)
PyPlot.plt.plot(h)

The last line is wrong and causing the error : "INFO: Loading help data... ERROR: PyError (:PyObject_Call) ValueError('setting an array element with a sequence.',)"

How do I correctly pass the data to PyPlot and get the histogram to display?

Upvotes: 2

Views: 151

Answers (1)

HarmonicaMuse
HarmonicaMuse

Reputation: 7893

Just use PyPlot.hist:

using Images, PyPlot
img = imread("image.jpg")
PyPlot.hist(vec(img), -1:255)

enter image description here

Also see the REPL help mode:

help> PyPlot.hist

Upvotes: 1

Related Questions