/* * SPDX-License-Identifier: MIT * * Copyright (C) 2013-2024 OpenMV, LLC. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * LBPu2 8,2 Operator. * Note: The distance function uses weights optimized for face recognition. * Note: See Timo Ahonen's "Face Recognition with Local Binary Patterns". */ #include #include #include #include "imlib.h" #include "file_utils.h" #ifdef IMLIB_ENABLE_FIND_LBP #define LBP_HIST_SIZE (59) //58 uniform hist + 1 #define LBP_NUM_REGIONS (7) //7x7 regions #define LBP_DESC_SIZE (LBP_NUM_REGIONS * LBP_NUM_REGIONS * LBP_HIST_SIZE) const static int8_t lbp_weights[49] = { 2, 1, 1, 1, 1, 1, 2, 2, 4, 4, 1, 4, 4, 2, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 2, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, }; const static uint8_t uniform_tbl[256] = { 0, 1, 2, 3, 4, 58, 5, 6, 7, 58, 58, 58, 8, 58, 9, 10, 11, 58, 58, 58, 58, 58, 58, 58, 12, 58, 58, 58, 13, 58, 14, 15, 16, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 17, 58, 58, 58, 58, 58, 58, 58, 18, 58, 58, 58, 19, 58, 20, 21, 22, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 23, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 24, 58, 58, 58, 58, 58, 58, 58, 25, 58, 58, 58, 26, 58, 27, 28, 29, 30, 58, 31, 58, 58, 58, 32, 58, 58, 58, 58, 58, 58, 58, 33, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 34, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 35, 36, 37, 58, 38, 58, 58, 58, 39, 58, 58, 58, 58, 58, 58, 58, 40, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 41, 42, 43, 58, 44, 58, 58, 58, 45, 58, 58, 58, 58, 58, 58, 58, 46, 47, 48, 58, 49, 58, 58, 58, 50, 51, 52, 58, 53, 54, 55, 56, 57 }; uint8_t *imlib_lbp_desc(image_t *image, rectangle_t *roi) { int s = image->w; //stride int RX = roi->w / LBP_NUM_REGIONS; int RY = roi->h / LBP_NUM_REGIONS; uint8_t *data = image->data; uint8_t *desc = m_malloc0(LBP_DESC_SIZE); for (int y = roi->y; y < (roi->y + roi->h) - 3; y++) { int y_idx = ((y - roi->y) / RY) * LBP_NUM_REGIONS; for (int x = roi->x; x < (roi->x + roi->w) - 3; x++) { uint8_t lbp = 0; uint8_t p = data[(y + 1) * s + x + 1]; int hist_idx = y_idx + (x - roi->x) / RX; lbp |= (data[(y + 0) * s + x + 0] >= p) << 0; lbp |= (data[(y + 0) * s + x + 1] >= p) << 1; lbp |= (data[(y + 0) * s + x + 2] >= p) << 2; lbp |= (data[(y + 1) * s + x + 2] >= p) << 3; lbp |= (data[(y + 2) * s + x + 2] >= p) << 4; lbp |= (data[(y + 2) * s + x + 1] >= p) << 5; lbp |= (data[(y + 2) * s + x + 0] >= p) << 6; lbp |= (data[(y + 1) * s + x + 0] >= p) << 7; desc[hist_idx * LBP_HIST_SIZE + uniform_tbl[lbp]]++; } } return desc; } int imlib_lbp_desc_distance(uint8_t *d0, uint8_t *d1) { uint32_t sum = 0; for (int i = 0; i < LBP_DESC_SIZE; i++) { int w = lbp_weights[i / LBP_HIST_SIZE]; sum += w * ((((d0[i] - d1[i]) * (d0[i] - d1[i])) / IM_MAX((d0[i] + d1[i]), 1))); } return sum; } int imlib_lbp_desc_save(FIL *fp, uint8_t *desc) { UINT bytes; // Write descriptor return file_ll_write(fp, desc, LBP_DESC_SIZE, &bytes); } int imlib_lbp_desc_load(FIL *fp, uint8_t **desc) { UINT bytes; FRESULT res = FR_OK; *desc = NULL; uint8_t *hist = m_malloc(LBP_DESC_SIZE); // Read descriptor res = file_ll_read(fp, hist, LBP_DESC_SIZE, &bytes); if (res != FR_OK || bytes != LBP_DESC_SIZE) { *desc = NULL; m_free(hist); } else { *desc = hist; } return res; } #endif //IMLIB_ENABLE_FIND_LBP