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# Copyright 2018 DT42
#
# This file is part of BerryNet.
#
# BerryNet is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# BerryNet is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with BerryNet. If not, see <http://www.gnu.org/licenses/>.
import base64
import json
from datetime import datetime
import cv2
import numpy as np
def encode_np_array(img):
retval, jpg_bytes = cv2.imencode('.jpg', img)
return jpg_bytes
def stringify_jpg(jpg_bytes):
return base64.b64encode(jpg_bytes).decode('utf-8')
def destringify_jpg(stringified_jpg):
"""
:return: JPEG bytes
:rtype: bytes
"""
return base64.b64decode(stringified_jpg.encode('utf-8'))
def jpg2bgr(jpg_bytes):
"""
:return: BGR bytes
:rtype: numpy array
"""
array = np.frombuffer(jpg_bytes, dtype=np.uint8)
return cv2.imdecode(array, flags=1)
def jpg2rgb(jpg_bytes):
"""
:return: RGB bytes
:rtype: numpy array
"""
return cv2.cvtColor(jpg2bgr(jpg_bytes), cv2.COLOR_BGR2RGB)
def bgr2rgb(bgr_nparray):
"""Convert image nparray from BGR to RGB.
Args:
bgr_nparray: Image nparray in BGR color model.
Returns:
Image nparray in RGB color model.
"""
return cv2.cvtColor(bgr_nparray, cv2.COLOR_BGR2RGB)
def rgb2bgr(rgb_nparray):
"""Convert image nparray from RGB to BGR.
Args:
rgb_nparray: Image nparray in RGB color model.
Returns:
Image nparray in BGR color model.
"""
return cv2.cvtColor(rgb_nparray, cv2.COLOR_RGB2BGR)
def serialize_payload(json_object):
return json.dumps(json_object)
def serialize_jpg(jpg_bytes):
"""Create Serialized JSON object consisting of image bytes and meta
:param imarray: JPEG bytes
:type imarray: bytes
:return: serialized image JSON
:rtype: string
"""
obj = {}
obj['timestamp'] = datetime.now().isoformat()
obj['bytes'] = stringify_jpg(jpg_bytes)
return json.dumps(obj)
def deserialize_payload(payload):
return json.loads(payload)
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