NiFi Ingest 23.2

# ObjectClassRecognition

Runs object class recognition on the file(s) associated with an IDOL document FlowFile, and adds information about any recognized objects to the IDOL document.

To run object class recognition you must have a recognizer. OpenText provides some pre-trained recognizers, and you can create your own. For more information about object class recognition, including how to train a recognizer, refer to the Media Server Administration Guide.

Supported file formats

The processor can handle video files.

The processor can handle the following image formats:

- TIFF
- JPEG
- JPEG 2000
- PNG
- GIF
- BMP (compressed BMP files are not supported) and ICO
- PBM, PGM, and PPM
- WebP

Additionally, if you configure your MediaServiceImpl controller service to use a KeyView Export Service, the processor can handle document formats, including:

- Adobe PDF
- Microsoft Word Document (.DOC and .DOCX)
- Microsoft Excel Sheet (.XLS and .XLSX)
- Microsoft PowerPoint Presentation (.PPT and .PPTX)
- OpenDocument Text (.ODT)
- OpenDocument Spreadsheet (.ODS)
- OpenDocument Presentation (.ODP)
- Rich Text (RTF)

## Properties

Name | Default Value | Description
--- | --- | ---
IDOL License Service |  | An IdolLicenseServiceImpl that provides a way to communicate with an IDOL License Server.
Media Service |  | A MediaServiceImpl that manages media analysis resources.
Video Sample Interval | 100 | The interval between video frames that are selected to be analyzed, in milliseconds.
Recognizer File |  | The path of a file that contains the recognizer to use. Set this property to use a recognizer that you exported from Media Server, using the action `ExportObjectClassRecognizer`.
Shared Recognizer |  | The name of the recognizer to use for object class recognition. Set this property to use a recognizer that is stored in the external database specified by the Media Service (see the "Media Service" property).
Detection Threshold | 30 | The minimum confidence score necessary to output a result.
World Coordinate Units |  | When you set this property, the processor performs perspective analysis and outputs real-world 3D coordinates for recognized objects. The processor expects each object class in the recognizer to have a metadata field named `dimensions(UNITS)`. For example, if you set this parameter to "m" the processor expects each class in the recognizer to have a metadata field named `dimensions(m)`. For more information about setting object dimensions, refer to the Media Server Administration Guide.
Camera View Angle |  | The horizontal angle of view of the camera, in degrees. If you want to use perspective analysis, OpenText recommends setting this parameter from the camera specifications (if known).
Image Output Format |  | When set, the processor saves the full image or best video frame for each recognized object, in the specified format (BMP, GIF, JPEG, PDF, PNG, PPM, TIFF or WEBP).
Video Clip Quality |  | When set to "low", "medium", or "high", the processor saves a video clip of the recognized object at the specified quality level.
Video Clip Height | 300 | The height of the video clip that is generated when you set Video Clip Quality, in pixels.

## Relationships

Name | Description
--- | ---
success | Processing was successful.
failure | Processing failed.

## Example Output

The following examples show the metadata that is added to an IDOL document by object class recognition.

Image or document input

    <idol_media>
      <objectclasses>
        <objectclass page="1">
          <recognizer>surveillance</recognizer>
          <class>car</class>
          <bestRegion>
            <region height="507" left="119" page="1" top="108" width="710"/>
            <imagefile>/opt/nifi/idol_repository/Files/ObjectClassRecognition_d696c556-0180-1000-2a61-7c313ce09bf8/0359bf72-2025-4b65-95c3-4ce8c4c59ab5.bmp</imagefile>
          </bestRegion>
          <region height="507" left="119" page="1" top="108" width="710"/>
        </objectclass>
      </objectclasses>
    </idol_media>

Video input

    <idol_media>
      <objectclasses>
        <objectclass duration="3.88" start="3.28">
          <recognizer>surveillance</recognizer>
          <class>car</class>
          <videoFile>/opt/nifi/idol_repository/Files/ObjectClassRecognition_d696c556-0180-1000-2a61-7c313ce09bf8/89954d48-98cd-43f9-b027-4e4f6845ddaf.mp4</videoFile>
          <bestRegion>
            <region height="92" left="487" timestamp="3.92" top="-1" width="130" x="3.96" y="83.92" z="0"/>
            <imagefile>/opt/nifi/idol_repository/Files/ObjectClassRecognition_d696c556-0180-1000-2a61-7c313ce09bf8/e5c819c5-1dcd-4929-af2b-3bf4e8acd1a0.bmp</imagefile>
          </bestRegion>
          <region duration="0.04" height="86" left="479" start="3.28" top="-31" width="122" x="3.94" y="89.17" z="0"/>
          <region duration="0.04" height="89" left="486" start="3.6" top="-16" width="126" x="4.01" y="86.47" z="0"/>
          <region duration="0.04" height="92" left="487" start="3.92" top="-1" width="130" x="3.96" y="83.92" z="0"/>
          <region duration="0.04" height="99" left="494" start="4.24" top="17" width="136" x="4.01" y="80.61" z="0"/>
          <region duration="0.04" height="106" left="501" start="4.56" top="35" width="142" x="4.05" y="77.55" z="0"/>
          <region duration="0.04" height="113" left="508" start="4.88" top="53" width="148" x="4.09" y="74.7" z="0"/>
          ...
        </objectclass>
        ...
      </objectclasses>
    </idol_media>

The XML contains an `objectclass` element for each object that is recognized.

- The `recognizer` element provides the name of the recognizer that was used to recognize the object.
- The `class` element provides the name of the object class.

- The `region` element describes the position of the recognized object.

  When you analyze an image or document the `page` attribute specifies the page on which the object was detected. When you analyze a video and an object is tracked across multiple frames, there can be multiple `region` elements with `start` and `duration` attributes that provide video timestamps, in seconds.

  The `left`, `top`, `width`, and `height` attributes provide the position and size of the region in pixels (`left` specifies the distance from the left side of the image to the left side of the region, and `top` specifies the distance from the top of the image to the top of the region). In the video example you can see that the car's `height` and `width` are increasing as the `start` time increases. This indicates that the car is moving towards the camera.

  When you analyze a video and set World Coordinate Units the `region` element can include `x`, `y`, and `z` attributes that provide the position of the object in real-world 3D coordinates. The measurements are in the same units that were used to specify the object size (metres, in this example). In the example you can see that the car is traveling on a flat road (`z=0`). The x-coordinate is relatively constant and the y-coordinate is decreasing, because the car is moving in a straight line towards the camera.

- The `bestRegion` element represents the best video frame in which the object was visible. It includes the following elements:

  - `region` - The position of the recognized object in the selected frame.
  - `imageFile` - The path of the image that is generated when you set the property Image Output Format.

- The `videoFile` element contains the path of the video file that is generated when you set the property Video Clip Quality.

Copyright 2018-2023 Open Text
Version 23.2 | Last updated March 2023

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Product: IDOL NiFi Ingest 23.2

Topic Title: ObjectClassRecognition