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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 filters.convolution import convolve
from filters.kernel.shift import Direction
from .utils import cmd_line, image
DEFAULT_DIRECTION = Direction.SOUTH_EAST
DEFAULT_DISTANCE = 1
def do_shift(
img_path, direction=DEFAULT_DIRECTION, distance=DEFAULT_DISTANCE,
output_path=None):
img = image.load_grayscale(img_path)
kernel = direction.gen_kernel(distance)
output = convolve(img, kernel)
if output_path is None:
image.show(output)
else:
image.save(output_path, output)
def _parse_direction(s):
try:
return Direction(s)
except ValueError:
raise argparse.ArgumentTypeError('invalid direction: ' + s)
def _parse_args(args=None):
if args is None:
args = sys.argv[1:]
parser = argparse.ArgumentParser(
description='Shift an image by a few pixels in a specified direction.')
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('--direction', '-d', choices=Direction,
type=_parse_direction, default=DEFAULT_DIRECTION,
help='specify shifting direction')
parser.add_argument('--distance', '-n',
type=cmd_line.parse_non_negative_integer,
default=DEFAULT_DISTANCE,
help='specify shift size (in pixels)')
return parser.parse_args(args)
def main(args=None):
do_shift(**vars(_parse_args(args)))
if __name__ == '__main__':
main()
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