chromium/third_party/libvpx/source/libvpx/vpx_dsp/skin_detection.c

/*
 *  Copyright (c) 2017 The WebM 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.
 */

#include "vpx_dsp/skin_detection.h"

#define MODEL_MODE …

// Fixed-point skin color model parameters.
static const int skin_mean[5][2] = …;
static const int skin_inv_cov[4] = …;  // q16
static const int skin_threshold[6] = …;  // q18
// Thresholds on luminance.
static const int y_low = …;
static const int y_high = …;

// Evaluates the Mahalanobis distance measure for the input CbCr values.
static int vpx_evaluate_skin_color_difference(const int cb, const int cr,
                                              const int idx) { … }

// Checks if the input yCbCr values corresponds to skin color.
int vpx_skin_pixel(const int y, const int cb, const int cr, int motion) { … }