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The confidence level for the detection of the face.
The range is Face.ScoreMin to Face.ScoreMax. Face.ScoreMax is the highest confidence.
Depending on the device, even very low-confidence faces may be listed, so applications should filter out faces with low confidence, depending on the use case. For a typical point-and-shoot camera application that wishes to display rectangles around detected faces, filtering out faces with confidence less than half of Face.ScoreMax is recommended.