Media Server 25.3
Media Server Help

# TrainImageComparisonReference

Trains Media Server to identify changes to an image. This adds a new reference, with a training image, to an image comparison database.

This action is atomic, so that any interruption to the server does not leave the database in an inconsistent state. The database is not modified if the action returns an error, or if you stop it using the QueueInfo action. If the training images fail, Media Server does not add the reference to the database.

Type: asynchronous

Parameter | Description | Required
--- | --- | ---
`database` | The name of the database to add the new image comparison reference to. The database must already exist. | Yes
`identifier` | A unique identifier for the reference (maximum 254 bytes). If you do not set this parameter, Media Server generates an identifier automatically. | No
`imagedata` | The training image to add. Send files to Media Server using a multipart/form-data HTTP POST request. | Set this or `imagepath`
`imagelabels` | A label to identify the image that you are adding (maximum 254 bytes). If you do not set this parameter, Media Server generates a label automatically. | No
`imagepath` | The path to the training image to add. The path must be absolute, or relative to the Media Server executable file. To strengthen security, Media Server can be configured to read files only from specified directories. For information about the directories that Media Server is permitted to read from, see the parameter AllowedInputDirectories. | Set this or `imagedata`
`metadata` | A comma-separated list of metadata key-value pairs to add to the reference. Separate keys from values using a colon (`:`). To include a comma or colon in a key name or value, enclose the key name or value in quotation marks (`"`) and escape any quotation marks that occur within the string with a backslash (`\`). | No

## Example

The following example trains Media Server by sending the path of a training image using the `imagepath` parameter:

    curl http://localhost:14000 -F action=TrainImageComparisonReference
                                -F database=ReferenceImages
                                -F identifier=toolkit
                                -F imagepath=toolkit1.png
                                -F imagelabels=image1
                                -F "metadata=PartNumber:8572087,\"another:value\":\"1,000\""

Alternatively, you can train Media Server by sending the image data, for example:

    curl http://localhost:14000 -F action=TrainImageComparisonReference
                                -F database=ReferenceImages
                                -F identifier=toolkit
                                -F imagedata=@toolkit1.png
                                -F imagelabels=image1
                                -F "metadata=PartNumber:8572087,\"another:value\":\"1,000\""

## Response

This action is asynchronous, so Media Server always returns success accompanied by a token. You can use this token with the QueueInfo action to retrieve the status of your request.

    <autnresponse>
      <action>QUEUEINFO</action>
      <response>SUCCESS</response>
      <responsedata>
        <actions>
          <action>
            <status>Finished</status>
            <queued_time>2015-Jun-04 09:53:21</queued_time>
            <time_in_queue>0</time_in_queue>
            <process_start_time>2015-Jun-04 09:53:21</process_start_time>
            <time_processing>0</time_processing>
            <process_end_time>2015-Jun-04 09:53:21</process_end_time>
            <build>
              <image>
                <index>1</index>
                <label>image1</label>
                <status>trained</status>
              </image>
            </build>
            <database>ReferenceImages</database>
            <identifier>toolkit</identifier>
            <numimages>1</numimages>
            <numtrained>1</numtrained>
            <token>...</token>
          </action>
        </actions>
      </responsedata>
    </autnresponse>

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Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Media Server 25.3

Topic Title: TrainImageComparisonReference