VisibilityFilter (util/visibility_smoothing_calculator.cc)

Copyright 2020 The MediaPipe Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

// Source: https://github.com/google-ai-edge/mediapipe | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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// Copyright 2020 The MediaPipe Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
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