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# Object Recognition

Object Recognition recognizes known objects that appear in media. Object recognition identifies specific objects, not classes of objects.

Before using object recognition, you must train Media Server by adding training images to the training database. For instructions that describe how to train Media Server, refer to the Media Server Administration Guide.

Configuration Parameter | Description
--- | ---
ColorAnalysis | Whether to perform color analysis on detected objects to reduce false detections.
Database | An object database to use to recognize objects in an image.
Geometry | The analysis mode to use when comparing the source media to 2-D objects in the training database.
Geometry3 | The analysis mode to use when comparing the source media to 3-D objects in the training database.
Identifier | A comma-separated list of identifiers that specifies the objects to match against.
Input | The image track to process.
MaxInputQueueLength | Can be used to place a limit on latency.
MaxSize | The maximum expected size of an object.
Metadata | A metadata field name and value to specify the objects to recognize.
MinSize | The minimum expected size of an object.
NumParallel | The maximum number of video frames to analyze simultaneously.
ObjectEnvironment | The type of background that a partially or completely transparent object is superimposed on.
Occlusion | Whether the object might be partially hidden in images.
Region | A region of the frame to restrict processing to.
RegionUnit | The units that the Region parameter uses to specify the size and position of a region.
RestrictToInputRegion | Specifies whether to analyze a region of the input image or video frame that is specified in the input record, instead of the entire image.
SampleInterval | The interval at which frames are selected to be analyzed.
SegmentDuration | The maximum duration of a record in the `SegmentedResult` or `SegmentedResultWithSource` track.
SizeUnit | The units to use for setting the `MinSize` and `MaxSize` parameters.
SyncDatabase | Specifies whether to synchronize with the training database before beginning the analysis task.
Type | The analysis engine to use. Set this parameter to `ObjectRecognition`.

## Output Tracks

Output track | Type | Description | Output1This column indicates whether the information contained in the track is included by default in the output created by an output task (when you don't set the Input parameter for the output task).
--- | --- | --- | ---
`Data` | ObjectRecognitionResult | Contains one record, describing the analysis results, per recognized object, per video frame. | No
`DataWithSource` | ObjectRecognitionResultAndImage | The same as the `Data` track, but each record also includes the source frame. | No
`Event` | ObjectRecognitionEvent | (Deprecated) Media Server creates a record in the `Event` track when an object appears or disappears. | Yes
`Result` | ObjectRecognitionResult | Contains one record, describing the analysis results, for each recognized object. When the same object appears in many consecutive frames, Media Server produces a single result. | Yes
`ResultWithSource` | ObjectRecognitionResultAndImage | The same as the `Result` track, but each record also includes the best source frame. | No
`SegmentedResult` | ObjectRecognitionResult | (Available only when processing video). Contains one or more records, describing the analysis results, for each recognized object. The maximum duration of records in this track is limited by the parameter SegmentDuration, so multiple records are created with the same ID when an object remains in the scene for longer than this duration. | Yes
`SegmentedResultWithSource` | ObjectRecognitionResultAndImage | (Available only when processing video). The same as the `SegmentedResult` track, but each record also includes the best source frame. | No
`Start` | ObjectRecognitionResult | The same as the `Data` track, except it contains only the first record of each event. | No
`End` | ObjectRecognitionResult | The same as the `Data` track, except it contains only the last record of each event. | No

ObjectRecognitionResult

Field name | Type | Description
--- | --- | ---
id | UUIDData | A universally unique identifier to identify the object
identity | IdentityData | The identity of the model in the database that matches the detected object
boundary | PolygonData | A polygon to indicate the location of the object in the frame

ObjectRecognitionResultAndImage

The same as `ObjectRecognitionResult` records, with the following additional fields.

Field name | Type | Description
--- | --- | ---
image | ImageData | The source frame

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