Add platform image_processing.qrcode (#20215)

* Add platform image_processing.qrcode

* Update qrcode.py

.coveragerc

@@ -573,6 +573,7 @@ omit =
     homeassistant/components/image_processing/dlib_face_identify.py
     homeassistant/components/image_processing/seven_segments.py
     homeassistant/components/image_processing/tensorflow.py
+    homeassistant/components/image_processing/qrcode.py
     homeassistant/components/keyboard_remote.py
     homeassistant/components/keyboard.py
     homeassistant/components/light/avion.py

homeassistant/components/image_processing/qrcode.py

@@ -0,0 +1,69 @@
+"""
+Support for the QR image processing.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/image_processing.qr/
+"""
+from homeassistant.core import split_entity_id
+from homeassistant.components.image_processing import (
+    ImageProcessingEntity, CONF_SOURCE, CONF_ENTITY_ID, CONF_NAME)
+
+REQUIREMENTS = ['pyzbar==0.1.7', 'pillow==5.4.1']
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the demo image processing platform."""
+    # pylint: disable=unused-argument
+    entities = []
+    for camera in config[CONF_SOURCE]:
+        entities.append(QrEntity(
+            camera[CONF_ENTITY_ID], camera.get(CONF_NAME)
+        ))
+
+    add_entities(entities)
+
+
+class QrEntity(ImageProcessingEntity):
+    """QR image processing entity."""
+
+    def __init__(self, camera_entity, name):
+        """Initialize QR image processing entity."""
+        super().__init__()
+
+        self._camera = camera_entity
+        if name:
+            self._name = name
+        else:
+            self._name = "QR {0}".format(
+                split_entity_id(camera_entity)[1])
+        self._state = None
+
+    @property
+    def camera_entity(self):
+        """Return camera entity id from process pictures."""
+        return self._camera
+
+    @property
+    def state(self):
+        """Return the state of the entity."""
+        return self._state
+
+    @property
+    def name(self):
+        """Return the name of the entity."""
+        return self._name
+
+    def process_image(self, image):
+        """Process image."""
+        import io
+        from pyzbar import pyzbar
+        from PIL import Image
+
+        stream = io.BytesIO(image)
+        img = Image.open(stream)
+
+        barcodes = pyzbar.decode(img)
+        if barcodes:
+            self._state = barcodes[0].data.decode("utf-8")
+        else:
+            self._state = None

requirements_all.txt

@@ -789,6 +789,7 @@ piglow==1.2.4
 pilight==0.1.1
 
 # homeassistant.components.camera.proxy
+# homeassistant.components.image_processing.qrcode
 # homeassistant.components.image_processing.tensorflow
 pillow==5.4.1
 
@@ -1397,6 +1398,9 @@ pyxeoma==1.4.0
 # homeassistant.components.zabbix
 pyzabbix==0.7.4
 
+# homeassistant.components.image_processing.qrcode
+pyzbar==0.1.7
+
 # homeassistant.components.sensor.qnap
 qnapstats==0.2.7