External denoiser based on noise estimation and moving object detection.

webrtc/modules/video_processing/noise_estimation.h

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_PROCESSING_NOISE_ESTIMATION_H_
+#define WEBRTC_MODULES_VIDEO_PROCESSING_NOISE_ESTIMATION_H_
+
+#include <climits>
+
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/video_processing/include/video_processing_defines.h"
+
+namespace webrtc {
+
+#define DISPLAY 0
+
+const int kNoiseThreshold = 120;
+// Disable the threshold for now.
+const int kNoiseThresholdHigh = INT_MAX;
+
+class NoiseEstimation {
+ public:
+  void SetResolution(int width, int height);
+  void GetNoise(int mb_index, uint32_t var, uint32_t luma);
+  void ResetConsecLowVar(int mb_index);
+  // 0: low, 1: medium, 2: high
+  // However, since kNoiseThresholdHigh is disabled for now,
+  // there are only 2 levels: low and high.
+  uint8_t GetNoiseLevel();
+
+ private:
+  int width_;
+  int height_;
+  uint32_t noise_var_;
+  double noise_var_accum_;
+  int num_noisy_block_;
+  int num_stationary_block_;
+  double percent_non_montion_block_;
+  rtc::scoped_ptr<uint32_t[]> consec_low_var_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_PROCESSING_NOISE_ESTIMATION_H_