AzureComputerVisionConnector

Categories

Web

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RasterObjectDetector

RekognitionConnector

Accesses the Azure Computer Vision Service to detect objects in images.

Jump to Configuration

Typical Uses

Submitting text to the Azure Computer Vision service to

  • detect individual objects
  • describe the general contents

How does it work?

The AzureComputerVisionConnector uses your Azure Cognitive Services account credentials (either via a previously defined FME web connection, or by setting up a new FME web connection right from the transformer) to access the service.

It will submit images to the service, and return features with attributes that describe the contents of the image. Services supported are object detection, text detection, and face detection.

  • For object detection, if the service is able to identify the exact location of an object in the image, a bounding box geometry will also be returned.
  • Text detection will always return bounding boxes around the detected text.
  • For face detection, if the service is able to identify the exact location of a face in the image, a bounding box geometry will also be returned. There is also the option to detect and locate facial landmarks.

Usage Notes

  • For better performance, requests to the Computer Vision service are made in parallel, and are returned as soon as they complete. Consequently, detection results will not be returned in the same order as their associated requests.
  • While powerful, the use of AI has important legal and ethical implications. Consult your local AI legislation and ethical guidelines before applying the AzureComputerVisionConnector in a production environment. For information about privacy and compliance with respect to Azure Cognitive Services, please see https://azure.microsoft.com/en-ca/support/legal/cognitive-services-compliance-and-privacy.

Configuration

Input Ports

This transformer accepts any feature. Raster geometries may be used as input if Raster Geometry is selected as the image source.

Note  The AzureComputerVisionConnector does not support coordinate systems.

Output Ports

Output will depend on the analysis chosen. Each input feature may result in multiple output features. For example, a single image is likely to contain multiple detectable objects.

Object Detection

Successfully identified objects will result in output features with attributes describing the objects. A bounding box geometry may also be returned, with a separate confidence value. Each input image may result in several detection features. Bounding boxes are in pixel units, and will align with the input.

Attributes

_label

A word or short phrase describing the content of the image. Labels may be general descriptors for the image, or may refer to identifiable instances in the image.

For example, a label of "Vegetation" with no bounding box indicates that there are plants somewhere in the image. A label of "Abies" with a bounding box might indicate that there is a fir tree in the top left corner.

_confidence

A number between 0 and 100 that indicates the probability that a given prediction is correct.

Text Detection

Successfully identified text will result in output features with attributes describing the text. Features will be output for lines of text, and for individual words in each line. Each feature will have a bounding box for the line or word.

When using a local file or raster geometry or URL as input, the bounding box is in pixel units, and will align with the input.

Attributes

_text

The detected text in the line or word.

_type

The type of detected text. Lines are sections of text that are aligned along the same horizontal axis. Sentences may be split across multiple lines. Words are sections of text separated by whitespace, and are associated with parent lines.

Options: LINE, WORD

_id

The number identifying the feature. If the feature represents a line of text, the identifier is unique within the image. If the feature represents a word, the identifier is unique within the parent line.

_parent_id

The _id value of the row the word is in. This value will be null for rows.

Face Detection

Successfully identified faces will result in output features with attributes describing the face. A bounding box geometry will also be returned, with a separate confidence value. Each input image may result in several detection features. Bounding boxes are in pixel units, and will align with the input.

Attributes

The following attributes are returned:

_head_pose_pitch
_head_pose_roll
_head_pose_yaw
_glasses
_blur_level
_blur_value
_exposure_level
_exposure_value
_noise_level
_noise_value

Output will depend on the analysis chosen. Only one output summary feature will be produced per input feature.

Object Detection

A summary feature with the original geometry and attributes preserved will always be output through the Summary port. Attributes will be added to indicate the labels that apply to the image in general, and not to a specific area.

Attributes

_labels{}.confidence

A number between 0 and 100 that indicates the probability that a given label is correct.

_labels{}.name

A word or phrase describing the content of the image.

Text Detection

A summary feature with the original geometry and attributes preserved will always be output through the Summary port. Attributes will be added to indicate the number of lines and words detected.

Attributes

_detected_words

The number of words that were detected in the image.

_detected_lines

The number of lines of text that were detected in the image.

Face Detection

A summary feature that contains details on the total amount of faces that were detected in the image.

Attributes

_detected_faces

The number of faces that were detected in the image.

The incoming feature is output through this port.

Features that cause the operation to fail are output through this port. An fme_rejection_code attribute, having the value ERROR_DURING_PROCESSING, will be added, along with a more descriptive fme_rejection_message attribute which contains more specific details as to the reason for the failure.

Note  If a feature comes in to the AzureComputerVisionConnector already having a value for fme_rejection_code, this value will be removed.

Rejected Feature Handling: can be set to either terminate the translation or continue running when it encounters a rejected feature. This setting is available both as a default FME option and as a workspace parameter.

Parameters

To use the AzureTextAnalyticsConnector or the AzureComputerVisionConnector you will need a Cognitive Services Account, then generate an endpoint and key to authenticate through our connectors.

Credential Source

The AzureComputerVisionConnector can use credentials from different sources. Using a web connection integrates best with FME, but in some cases, you may wish to use one of the other sources.

  • Web Connection - use an Azure Cognitive Services web connection stored in the FME web connections database
  • Embedded - embed an endpoint and secret key as parameters in the transformer

Account

Available when the credential source is Web Connection. To create a Azure Cognitive Services connection, click the 'Account' drop-down box and select 'Add Web Connection...'.

The connection can then be managed via Tools -> FME Options... -> Web Connections.

Endpoint and Secret Key

Available when the credential source is Embedded. An endpoint and secret key can be specified directly in the transformer instead of in a web connection.

Image Source

Where to get the input image for detection. Options are:

  • Local File: specify a path to a JPEG or PNG file on disk
  • URL: specify an image URL
  • Raster Geometry: use the raster geometry of incoming features

Input Filename

If Local File is selected for the image source, the path to the JPEG or PNG file to use.

URL

If URL is selected for the image source, the source URL to use.

Detection Type

The type of operation to perform. Choices are:

  • Object Detection: Detect labels for the given image. If possible, instances of each label will be identified with output bounding boxes.
  • Text Detection: Detect text in the given image. Bounding boxes will be output for each detected line and for each detected word within the line.
  • Face Detection: Detect faces in the given image. Bounding boxes and facial landmarks will be in the output for each detected face.

The remaining parameters available depend on the value of the Request > Detection Type parameter. Parameters for each Detection Type are detailed below.

Object Detection Options

Object detection does not require any additional parameters.

Text Detection Options

Text Analysis Language

The language to be detected. The language code must be used for the attribute value (for example, “en”). Use “Unknown [unk]” for automatic language detection.

Face Detection Options

Output Facial Landmark Points

Whether to include information about facial landmarks in output features.

Editing Transformer Parameters

Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

String Functions

These functions manipulate and format strings.

Special Characters

 A set of control characters is available in the Text Editor.

Math Functions

Math functions are available in both editors.
Date/Time Functions Date and time functions are available in the Text Editor.

Math Operators

These operators are available in the Arithmetic Editor.

FME Feature Functions

These return primarily feature-specific values.

FME Parameters

FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters Create your own editable parameters.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.

Row Reordering

Enabled once you have clicked on a row item. Choices include:

  • Add a row
  • Remove a row
  • Move current row up one
  • Move current row down one
  • Move current row to top
  • Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

  • Cut a row - delete and copy to clipboard
  • Copy a row to the clipboard
  • Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

Reference

Processing Behavior

Feature-Based

Feature Holding

No
Dependencies Azure Cognitive Services Account
Aliases  
History Released FME 2019.2

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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.