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Diffstat (limited to 'vp10/encoder/skin_detection.c')
| -rw-r--r-- | vp10/encoder/skin_detection.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/vp10/encoder/skin_detection.c b/vp10/encoder/skin_detection.c deleted file mode 100644 index 9aac477a8..000000000 --- a/vp10/encoder/skin_detection.c +++ /dev/null @@ -1,104 +0,0 @@ -/* - * Copyright (c) 2015 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 <limits.h> -#include <math.h> - -#include "vp10/common/blockd.h" -#include "vp10/encoder/encoder.h" -#include "vp10/encoder/skin_detection.h" - -// Fixed-point skin color model parameters. -static const int skin_mean[2] = {7463, 9614}; // q6 -static const int skin_inv_cov[4] = {4107, 1663, 1663, 2157}; // q16 -static const int skin_threshold = 1570636; // q18 - -// Thresholds on luminance. -static const int y_low = 20; -static const int y_high = 220; - -// Evaluates the Mahalanobis distance measure for the input CbCr values. -static int evaluate_skin_color_difference(int cb, int cr) { - const int cb_q6 = cb << 6; - const int cr_q6 = cr << 6; - const int cb_diff_q12 = (cb_q6 - skin_mean[0]) * (cb_q6 - skin_mean[0]); - const int cbcr_diff_q12 = (cb_q6 - skin_mean[0]) * (cr_q6 - skin_mean[1]); - const int cr_diff_q12 = (cr_q6 - skin_mean[1]) * (cr_q6 - skin_mean[1]); - const int cb_diff_q2 = (cb_diff_q12 + (1 << 9)) >> 10; - const int cbcr_diff_q2 = (cbcr_diff_q12 + (1 << 9)) >> 10; - const int cr_diff_q2 = (cr_diff_q12 + (1 << 9)) >> 10; - const int skin_diff = skin_inv_cov[0] * cb_diff_q2 + - skin_inv_cov[1] * cbcr_diff_q2 + - skin_inv_cov[2] * cbcr_diff_q2 + - skin_inv_cov[3] * cr_diff_q2; - return skin_diff; -} - -int vp10_skin_pixel(const uint8_t y, const uint8_t cb, const uint8_t cr) { - if (y < y_low || y > y_high) - return 0; - else - return (evaluate_skin_color_difference(cb, cr) < skin_threshold); -} - -#ifdef OUTPUT_YUV_SKINMAP -// For viewing skin map on input source. -void vp10_compute_skin_map(VP10_COMP *const cpi, FILE *yuv_skinmap_file) { - int i, j, mi_row, mi_col; - VP10_COMMON *const cm = &cpi->common; - uint8_t *y; - const uint8_t *src_y = cpi->Source->y_buffer; - const uint8_t *src_u = cpi->Source->u_buffer; - const uint8_t *src_v = cpi->Source->v_buffer; - const int src_ystride = cpi->Source->y_stride; - const int src_uvstride = cpi->Source->uv_stride; - YV12_BUFFER_CONFIG skinmap; - memset(&skinmap, 0, sizeof(YV12_BUFFER_CONFIG)); - if (vpx_alloc_frame_buffer(&skinmap, cm->width, cm->height, - cm->subsampling_x, cm->subsampling_y, - VP9_ENC_BORDER_IN_PIXELS, cm->byte_alignment)) { - vpx_free_frame_buffer(&skinmap); - return; - } - memset(skinmap.buffer_alloc, 128, skinmap.frame_size); - y = skinmap.y_buffer; - // Loop through 8x8 blocks and set skin map based on center pixel of block. - // Set y to white for skin block, otherwise set to source with gray scale. - // Ignore rightmost/bottom boundary blocks. - for (mi_row = 0; mi_row < cm->mi_rows - 1; ++mi_row) { - for (mi_col = 0; mi_col < cm->mi_cols - 1; ++mi_col) { - // Use middle pixel for each 8x8 block for skin detection. - // If middle pixel is skin, assign whole 8x8 block to skin. - const uint8_t ysource = src_y[4 * src_ystride + 4]; - const uint8_t usource = src_u[2 * src_uvstride + 2]; - const uint8_t vsource = src_v[2 * src_uvstride + 2]; - const int is_skin = vp10_skin_pixel(ysource, usource, vsource); - for (i = 0; i < 8; i++) { - for (j = 0; j < 8; j++) { - if (is_skin) - y[i * src_ystride + j] = 255; - else - y[i * src_ystride + j] = src_y[i * src_ystride + j]; - } - } - y += 8; - src_y += 8; - src_u += 4; - src_v += 4; - } - y += (src_ystride << 3) - ((cm->mi_cols - 1) << 3); - src_y += (src_ystride << 3) - ((cm->mi_cols - 1) << 3); - src_u += (src_uvstride << 2) - ((cm->mi_cols - 1) << 2); - src_v += (src_uvstride << 2) - ((cm->mi_cols - 1) << 2); - } - vp10_write_yuv_frame_420(&skinmap, yuv_skinmap_file); - vpx_free_frame_buffer(&skinmap); -} -#endif |