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"FacialExpression" (Built-in Classifier)

Recognize what expression a face displays from an image.

Classes

Details

  • The classifier is applied to the largest face found in the image.

Examples

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Basic Examples  (2)

Determine the facial expression of a person:

Wolfram Language code: Classify["FacialExpression", [image] ]

Obtain the probabilities for the 3 most likely classes:

Wolfram Language code: Classify["FacialExpression"][[image], "TopProbabilities" -> 3]

Obtain a ClassifierFunction for this classifier:

Wolfram Language code: c = Classify["FacialExpression"]

Use the classifier function to classify the facial expression of an example:

Wolfram Language code: c[[image]]

Classify many examples at once:

Wolfram Language code: c[{[image], [image]}]

Scope  (2)

Find faces in an image:

Wolfram Language code: img = [image];
Wolfram Language code: faces = ImageTrim[img, #]& /@ FindFaces[img]

Use the classifier on each face:

Wolfram Language code: Classify["FacialExpression", faces]

For images with many faces, the "FacialExpression" classifier selects the largest face automatically:

Wolfram Language code: Classify["FacialExpression", img]

Load the ClassifierFunction corresponding to the built-in classifier:

Wolfram Language code: c = Classify["FacialExpression"]

Obtain the possible classes:

Wolfram Language code: Information[c, "Classes"]

Options  (2)

ClassPriors  (1)

Use a custom ClassPriors to restrict the possible outputs:

Wolfram Language code: Classify["FacialExpression", [image], ClassPriors -> <|Entity["Word", "sadness"] -> 0.5, Entity["Word", "happiness"] -> 0.5|>]

IndeterminateThreshold  (1)

Use a custom IndeterminateThreshold:

Wolfram Language code: Classify["FacialExpression", [image], IndeterminateThreshold -> 0.6]

Interactive Examples  (1)

Interact with the classifier using a dynamic interface:

Wolfram Language code: Dynamic[im = CurrentImage[];Labeled[im, Column@Classify["FacialExpression"][im, "TopProbabilities" -> 3]] ]

Neat Examples  (1)

Obtain different expressions with their corresponding probabilities:

Wolfram Language code: expressions = Classify["FacialExpression", [image], "Probabilities"]

Visualize the result using WordCloud:

Wolfram Language code: WordCloud[expressions]