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# Copyright 2016 (c) Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "Simple image filters" project.
# For details, see https://github.com/egor-tensin/filters.
# Distributed under the MIT License.
import argparse
import sys
from .utils import cmd_line, image
from filters.convolution import convolve
from filters.kernel.gaussian_blur import gen_kernel
DEFAULT_SIGMA = 1.
DEFAULT_RADIUS = 1
def _main_gaussian_blur(
img_path, radius=DEFAULT_RADIUS, sigma=DEFAULT_SIGMA,
output_path=None):
img = image.load_grayscale(img_path)
kernel = gen_kernel(radius, sigma)
output = convolve(img, kernel)
if output_path is None:
image.show(output)
else:
image.save(output_path, output)
def _parse_args(args=sys.argv):
parser = argparse.ArgumentParser(
description='Apply Gaussian blur to an image.')
parser.add_argument('img_path', help='source image file path')
parser.add_argument('--output', '-o', dest='output_path', default=None,
help='save new image to a file')
parser.add_argument('--sigma', '-s',
type=float, default=DEFAULT_SIGMA,
help='specify the sigma coefficient in the Gaussian formula')
parser.add_argument('--radius', '-r',
type=cmd_line.parse_non_negative_integer,
default=DEFAULT_RADIUS,
help='specify convolution kernel radius')
return parser.parse_args(args[1:])
def _main(args=sys.argv):
_main_gaussian_blur(**vars(_parse_args(args)))
if __name__ == '__main__':
_main()
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