histogram.py

#!/usr/bin/env python

#######################################################
# Copyright (c) 2019, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################

import os
import sys

import arrayfire as af

if __name__ == "__main__":
    if len(sys.argv) == 1:
        raise RuntimeError("Expected to the image as the first argument")

    if not os.path.isfile(sys.argv[1]):
        raise RuntimeError("File %s not found" % sys.argv[1])

    if len(sys.argv) > 2:
        af.set_device(int(sys.argv[2]))

    af.info()

    hist_win = af.Window(512, 512, "3D Plot example using ArrayFire")
    img_win = af.Window(480, 640, "Input Image")

    img = af.load_image(sys.argv[1]).as_type(af.Dtype.u8)
    hist = af.histogram(img, 256, 0, 255)

    while not (hist_win.close() or img_win.close()):
        hist_win.hist(hist, 0, 255)
        img_win.image(img)