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Image Comparison Results

The following XML shows a single record produced by image comparison.

<output>
  <record>
    <pageNumber>1</pageNumber>
    <trackname>Compare.Result</trackname>
    <ImageComparisonResult>
      <identity>
        <identifier>Camera39</identifier>
        <database>ReferenceImages</database>
        <imagelabel>4132cf6ee5bcff7b03037140767ff32c</imagelabel>
        <metadata>
          <item>
            <key>Location</key>
            <value>Cambridge</value>
          </item>
        </metadata>
      </identity>
      <imageChangeScore>19.27</imageChangeScore>
      <changedRegion>
        <region>
          <left>40</left>
          <top>8</top>
          <width>40</width>
          <height>40</height>
        </region>
        <score>82.72</score>
      </changedRegion>
      <changedRegion>
        <region>
          <left>80</left>
          <top>8</top>
          <width>40</width>
          <height>40</height>
        </region>
        <score>30.14</score>
      </changedRegion>
      ...
</output>

The record contains the following information:

• The identity element describes the reference image (in your training database) that was used for comparison. HPE Media Server creates a separate record for each reference that the ingested image was compared to.

  • The identifier element provides the identifier of the reference.
  • The database element provides the name of the database in which the reference exists.
  • The imagelabel element provides the label of the reference image that was used for comparison.
  • The metadata element provides metadata that you associated with the reference when you trained HPE Media Server. If there is no metadata in the training database, this element is omitted.
• The imageChangeScore element indicates the amount of change between the images. This value is a percentage, between zero (no changes) and 100 (every region has significant changes).

• Each changedRegion element provides the amount of change in a small region of the image. You can use this information to locate the largest changes.

  • The region element describes the position of the top-left corner of the region, and its width and height.
  • The score element specifies how much the region has changed, as a percentage from zero to 100. A high score indicates that there are major changes within the region and a low score indicates minor differences.