Microsoft Azure Ink Recognizer Library for Python
Azure Ink Recognizer client library for Python
Azure Ink Recognizer SDK is an SDK for developers to work with Azure Ink Recognizer Service. The service recognize a collection of ink strokes and return a tree hierarchy of the recognized units, such as lines, words, shapes, as well as the handwriting recognition result of the words.
- Connect to Azure Ink Recognizer Service
- Convert collections of ink strokes into HTTP requests
- Parse HTTP response into ink recognition units
Install the package
Install the Azure Cosmos DB client library for Python with pip:
pip install azure-cognitiveservices-inkrecognizer
Please find the URL at Ink Recognizer Rest API documentation
Please follow the instructions on Ink Recognizer.
Implement ink stroke
If you don't have any pre-defined ink point or ink stroke classes, you can either follow the Ink Stroke Interfaces to build your stroke, or build your own class that has all required fields. If you already defined ink strokes yourself, you should feed attributes in your class according to the interfaces.
from azure.cognitiveservices.inkrecognizer import InkStrokeKind InkPoint = namedtuple("InkPoint", "x y") class InkStroke(): def __init__(self, ink_stroke_id, ink_points, stroke_kind=InkStrokeKind.UNKNOWN, stroke_language=""): self.id = ink_stroke_id self.points = ink_points self.kind = stroke_kind self.language = stroke_language
You can then create a list (or any iterable object) of ink strokes for recognition.
Create a client
Once you got the url for ink recognizer service and an Azure credential instance, you can create an InkRecognizerClient
from azure.cognitiveservices.inkrecognizer import InkRecognizerClient client = InkRecognizerClient(url, api_key) # api_key is your key as string
Or use Async version (Python 3.5.3+ only)
from azure.cognitiveservices.inkrecognizer.aio import InkRecognizerClient client = InkRecognizerClient(url, api_key) # api_key is your key as string
Send a request
You can then send stroke list to Ink Recognizer Service and get the root of all ink recognition results.
# Sync version recognition_root = client.recognize_ink(ink_stroke_list) # Async version recognition_root = await client.recognize_ink(ink_stroke_list)
Get recognition units from results
You can get all the recognition units either by InkRecognitionUnitKind or by hierarchy, then visit support properties of the units. API reference documentation
lines = recognition_root.lines for line in lines: foo_show_bounding_box(line.bounding_box) for word in line.words: print(word.recognized_text)
The Samples provide several code snippets covering some of the most common Ink Recognizer SDK tasks, including:
- Implement InkPoint and InkStroke classes
- Convert stroke unit from pixel to mm
- Set language recognition locale
- Indexing a key word from recognition results
- Set application kind if user know expected type of ink content
Ink Recognizer clients raise exceptions defined in azure-core. For example, if you try to reach an invalid URL, InkRecognizerClient raises ResourceNotFoundError:
from azure.core.exceptions import ResourceNotFoundError client = InkRecognizerClient("invalid_url", credential) try: client.recognize_ink(ink_strokes) except ResourceNotFoundError as e: print(e.message)
Network trace logging is disabled by default for this library. When enabled, HTTP requests will be logged at DEBUG level using the logging library. You can configure logging to print debugging information to stdout or write it to a file:
import sys import logging # Create a logger for the 'azure' SDK logger = logging.getLogger(__name__) logger.setLevel(logging.DEBUG) # Configure a console output handler = logging.StreamHandler(stream=sys.stdout) logger.addHandler(handler) # Configure a file output file_handler = logging.FileHandler(filename) logger.addHandler(file_handler) # Enable network trace logging. Each HTTP request will be logged at DEBUG level. client = InkRecognizerClient(url=url, credential=credential, logging_enable=True)
For more extensive documentation on the Ink Recognizer Service, see the Ink Recognizer Service Documentation.
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