Importing & Exporting Tracking Models

Brian Genna -

 

Analyzer has the ability to use data from a finished tracking job to help track more jobs with the same actor by using the Import Tracking Model and Export Tracking Model options. This can help speed tracking up significantly, particularly if there are a large number of shots with the same actor by providing an excellent starting point for the job. 

Export Tracking Model

Export Tracking Model gathers both the statistical models that were used in the shot as well as the individual training frames and saves them for use in other shots. The depth of the model and the number of training frames can be added to with each subsequent shot if desired, making a more complete model.

To export tracking data from a finished shot:

  1. All three face groups must have been trained
  2. Select 'Export Tracking Model' from the File menu
  3. Choose a folder to save the files to. It is recommended that a separate folder is created for each actor's data.
  4. You should receive a confirmation message saying confirming a successful export
    Importmodel_confirmation.jpg
     

*Note - If you are exporting from a shot that already used the Import Tracking Model function, then you will be asked if you want to overwrite the data that already exists. Selecting 'Yes' will add the new models and training frames to the folder, but you will still have all of the ones you previously imported. This is how the data pool grows and the model becomes more complete.

Import Tracking Model

Importmodel_menu.jpg

Import Tracking Model takes the models and training frames that were exported and brings them into Analyzer to be used on a new job.

To import tracking data into a new shot:

  1. Begin a new job as normal
  2. Select 'Import Tracking Model' from the File menu
  3. Select the folder where the data exists
  4. If successful, a confirmation message appears detailing what was imported
    Importmodel_import_confirmation.jpg
     

Using Imported Data

To use the data:

  1. Begin by placing one training frame on the face group you want to start with, the Eyes, Mouth, or Brows (remember, the Face is not a work group and should only be used to review a shot)
  2. Select 'Track' as you normally would.
  3. Once tracking is complete, review the results. Add training frames as normal to frames that are off.
  4. When you have added the training frames, go to the Track menu and select 'Train Model - All.' This will train a model using both the imported training frames and the new ones created within the shot.
  5. Repeat this until satisfied with the results, then do so for each subsequent face group.
  6. If desired when finished, export the new frames and model as described above.

*Note - 'Train Model - Local' only uses the training frames in the current job. This can be useful if the number of training frames becomes too great, or if the imported frames are not representative of the shot you're working on.

*Note - Once a solid model has been achieved through multiple uses of the Export Tracking Model function, it is recommended to stop adding more data. There is a point at which too many similar training frames can make the tracking jittery.

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