175 lines
6.9 KiB
C
175 lines
6.9 KiB
C
/*
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* Copyright (c) 2015 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <limits.h>
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#include <math.h>
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#include "vp9/common/vp9_blockd.h"
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#include "vp9/encoder/vp9_encoder.h"
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#include "vp9/encoder/vp9_skin_detection.h"
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int vp9_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
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int stride, int strideuv, int bsize,
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int consec_zeromv, int curr_motion_magn) {
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// No skin if block has been zero/small motion for long consecutive time.
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if (consec_zeromv > 60 && curr_motion_magn == 0) {
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return 0;
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} else {
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int motion = 1;
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// Take center pixel in block to determine is_skin.
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const int y_width_shift = (4 << b_width_log2_lookup[bsize]) >> 1;
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const int y_height_shift = (4 << b_height_log2_lookup[bsize]) >> 1;
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const int uv_width_shift = y_width_shift >> 1;
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const int uv_height_shift = y_height_shift >> 1;
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const uint8_t ysource = y[y_height_shift * stride + y_width_shift];
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const uint8_t usource = u[uv_height_shift * strideuv + uv_width_shift];
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const uint8_t vsource = v[uv_height_shift * strideuv + uv_width_shift];
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if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
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return vpx_skin_pixel(ysource, usource, vsource, motion);
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}
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}
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void vp9_compute_skin_sb(VP9_COMP *const cpi, BLOCK_SIZE bsize, int mi_row,
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int mi_col) {
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int i, j, num_bl;
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VP9_COMMON *const cm = &cpi->common;
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const uint8_t *src_y = cpi->Source->y_buffer;
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const uint8_t *src_u = cpi->Source->u_buffer;
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const uint8_t *src_v = cpi->Source->v_buffer;
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const int src_ystride = cpi->Source->y_stride;
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const int src_uvstride = cpi->Source->uv_stride;
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const int y_bsize = 4 << b_width_log2_lookup[bsize];
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const int uv_bsize = y_bsize >> 1;
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const int shy = (y_bsize == 8) ? 3 : 4;
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const int shuv = shy - 1;
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const int fac = y_bsize / 8;
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const int y_shift = src_ystride * (mi_row << 3) + (mi_col << 3);
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const int uv_shift = src_uvstride * (mi_row << 2) + (mi_col << 2);
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const int mi_row_limit = VPXMIN(mi_row + 8, cm->mi_rows - 2);
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const int mi_col_limit = VPXMIN(mi_col + 8, cm->mi_cols - 2);
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src_y += y_shift;
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src_u += uv_shift;
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src_v += uv_shift;
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for (i = mi_row; i < mi_row_limit; i += fac) {
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num_bl = 0;
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for (j = mi_col; j < mi_col_limit; j += fac) {
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int consec_zeromv = 0;
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int bl_index = i * cm->mi_cols + j;
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int bl_index1 = bl_index + 1;
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int bl_index2 = bl_index + cm->mi_cols;
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int bl_index3 = bl_index2 + 1;
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// Don't detect skin on the boundary.
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if (i == 0 || j == 0) continue;
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if (bsize == BLOCK_8X8)
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consec_zeromv = cpi->consec_zero_mv[bl_index];
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else
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consec_zeromv = VPXMIN(cpi->consec_zero_mv[bl_index],
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VPXMIN(cpi->consec_zero_mv[bl_index1],
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VPXMIN(cpi->consec_zero_mv[bl_index2],
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cpi->consec_zero_mv[bl_index3])));
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cpi->skin_map[bl_index] =
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vp9_compute_skin_block(src_y, src_u, src_v, src_ystride, src_uvstride,
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bsize, consec_zeromv, 0);
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num_bl++;
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src_y += y_bsize;
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src_u += uv_bsize;
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src_v += uv_bsize;
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}
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src_y += (src_ystride << shy) - (num_bl << shy);
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src_u += (src_uvstride << shuv) - (num_bl << shuv);
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src_v += (src_uvstride << shuv) - (num_bl << shuv);
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}
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// Remove isolated skin blocks (none of its neighbors are skin) and isolated
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// non-skin blocks (all of its neighbors are skin).
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// Skip 4 corner blocks which have only 3 neighbors to remove isolated skin
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// blocks. Skip superblock borders to remove isolated non-skin blocks.
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for (i = mi_row; i < mi_row_limit; i += fac) {
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for (j = mi_col; j < mi_col_limit; j += fac) {
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int bl_index = i * cm->mi_cols + j;
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int num_neighbor = 0;
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int mi, mj;
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int non_skin_threshold = 8;
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// Skip 4 corners.
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if ((i == mi_row && (j == mi_col || j == mi_col_limit - fac)) ||
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(i == mi_row_limit - fac && (j == mi_col || j == mi_col_limit - fac)))
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continue;
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// There are only 5 neighbors for non-skin blocks on the border.
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if (i == mi_row || i == mi_row_limit - fac || j == mi_col ||
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j == mi_col_limit - fac)
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non_skin_threshold = 5;
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for (mi = -fac; mi <= fac; mi += fac) {
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for (mj = -fac; mj <= fac; mj += fac) {
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if (i + mi >= mi_row && i + mi < mi_row_limit && j + mj >= mi_col &&
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j + mj < mi_col_limit) {
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int bl_neighbor_index = (i + mi) * cm->mi_cols + j + mj;
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if (cpi->skin_map[bl_neighbor_index]) num_neighbor++;
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}
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}
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}
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if (cpi->skin_map[bl_index] && num_neighbor < 2)
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cpi->skin_map[bl_index] = 0;
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if (!cpi->skin_map[bl_index] && num_neighbor == non_skin_threshold)
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cpi->skin_map[bl_index] = 1;
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}
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}
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}
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#ifdef OUTPUT_YUV_SKINMAP
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// For viewing skin map on input source.
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void vp9_output_skin_map(VP9_COMP *const cpi, FILE *yuv_skinmap_file) {
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int i, j, mi_row, mi_col, num_bl;
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VP9_COMMON *const cm = &cpi->common;
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uint8_t *y;
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const uint8_t *src_y = cpi->Source->y_buffer;
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const int src_ystride = cpi->Source->y_stride;
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const int y_bsize = 16; // Use 8x8 or 16x16.
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const int shy = (y_bsize == 8) ? 3 : 4;
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const int fac = y_bsize / 8;
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YV12_BUFFER_CONFIG skinmap;
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memset(&skinmap, 0, sizeof(YV12_BUFFER_CONFIG));
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if (vpx_alloc_frame_buffer(&skinmap, cm->width, cm->height, cm->subsampling_x,
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cm->subsampling_y, VP9_ENC_BORDER_IN_PIXELS,
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cm->byte_alignment)) {
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vpx_free_frame_buffer(&skinmap);
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return;
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}
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memset(skinmap.buffer_alloc, 128, skinmap.frame_size);
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y = skinmap.y_buffer;
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// Loop through blocks and set skin map based on center pixel of block.
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// Set y to white for skin block, otherwise set to source with gray scale.
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// Ignore rightmost/bottom boundary blocks.
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for (mi_row = 0; mi_row < cm->mi_rows - 1; mi_row += fac) {
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num_bl = 0;
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for (mi_col = 0; mi_col < cm->mi_cols - 1; mi_col += fac) {
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const int block_index = mi_row * cm->mi_cols + mi_col;
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const int is_skin = cpi->skin_map[block_index];
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for (i = 0; i < y_bsize; i++) {
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for (j = 0; j < y_bsize; j++) {
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y[i * src_ystride + j] = is_skin ? 255 : src_y[i * src_ystride + j];
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}
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}
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num_bl++;
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y += y_bsize;
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src_y += y_bsize;
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}
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y += (src_ystride << shy) - (num_bl << shy);
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src_y += (src_ystride << shy) - (num_bl << shy);
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}
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vpx_write_yuv_frame(yuv_skinmap_file, &skinmap);
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vpx_free_frame_buffer(&skinmap);
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}
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#endif
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