added BIF implementation

minor refactoring

added more tests

minor

fixed warnings

minor

minor

minor

fixed comment

modules/face/include/opencv2/face/bif.hpp

+/*
+By downloading, copying, installing or using the software you agree to this license.
+If you do not agree to this license, do not download, install,
+copy or use the software.
+
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2000-2015, Intel Corporation, all rights reserved.
+Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
+Copyright (C) 2009-2015, NVIDIA Corporation, all rights reserved.
+Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.
+Copyright (C) 2015, OpenCV Foundation, all rights reserved.
+Copyright (C) 2015, Itseez Inc., all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are disclaimed.
+In no event shall copyright holders or contributors be liable for any direct,
+indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.
+*/
+
+#ifndef __OPENCV_BIF_HPP__
+#define __OPENCV_BIF_HPP__
+
+#include "opencv2/core.hpp"
+
+namespace cv {
+namespace face {
+
+/** Implementation of bio-inspired features (BIF) from the paper:
+ *  Guo, Guodong, et al. "Human age estimation using bio-inspired features."
+ *  Computer Vision and Pattern Recognition, 2009. CVPR 2009.
+ */
+class CV_EXPORTS_W BIF : public Algorithm {
+public:
+    /** @returns The number of filter bands used for computing BIF. */
+    CV_WRAP virtual int getNumBands() const = 0;
+
+    /** @returns The number of image rotations. */
+    CV_WRAP virtual int getNumRotations() const = 0;
+
+    /** Computes features sby input image.
+     *  @param image Input image (CV_32FC1).
+     *  @param features Feature vector (CV_32FC1).
+     */
+    CV_WRAP virtual void compute(InputArray image,
+                                 OutputArray features) const = 0;
+};
+
+/**
+ * @param num_bands The number of filter bands (<=8) used for computing BIF.
+ * @param num_rotations The number of image rotations for computing BIF.
+ * @returns Object for computing BIF.
+ */
+CV_EXPORTS_W cv::Ptr<BIF> createBIF(int num_bands = 8, int num_rotations = 12);
+
+}  // namespace cv
+}  // namespace face
+
+#endif  // #ifndef __OPENCV_FACEREC_HPP__

modules/face/src/bif.cpp

+/*
+By downloading, copying, installing or using the software you agree to this license.
+If you do not agree to this license, do not download, install,
+copy or use the software.
+
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2000-2015, Intel Corporation, all rights reserved.
+Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
+Copyright (C) 2009-2015, NVIDIA Corporation, all rights reserved.
+Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.
+Copyright (C) 2015, OpenCV Foundation, all rights reserved.
+Copyright (C) 2015, Itseez Inc., all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are disclaimed.
+In no event shall copyright holders or contributors be liable for any direct,
+indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.
+*/
+
+
+/*
+This file contains implementation of the bio-inspired features (BIF) approach
+for computing image descriptors, applicable for human age estimation. For more
+details we refer to [1,2].
+
+REFERENCES
+  [1] Guo, Guodong, et al. "Human age estimation using bio-inspired features."
+      Computer Vision and Pattern Recognition, 2009. CVPR 2009.
+  [2] Spizhevoi, A. S., and A. V. Bovyrin. "Estimating human age using
+      bio-inspired features and the ranking method." Pattern Recognition and
+      Image Analysis 25.3 (2015): 547-552.
+*/
+
+#include "precomp.hpp"
+#include "opencv2/face/bif.hpp"
+#include <iostream>
+#include <vector>
+
+namespace {
+
+// The constants below are taken from paper [1].
+
+const int kNumBandsMax = 8;
+
+const cv::Size kCellSizes[kNumBandsMax] = {
+    cv::Size(6,6), cv::Size(8,8), cv::Size(10,10), cv::Size(12,12),
+    cv::Size(14,14), cv::Size(16,16), cv::Size(18,18), cv::Size(20,20)
+};
+
+const cv::Size kGaborSize[kNumBandsMax][2] = {
+    {cv::Size(5,5), cv::Size(7,7)}, {cv::Size(9,9), cv::Size(11,11)},
+    {cv::Size(13,13), cv::Size(15,15)}, {cv::Size(17,17), cv::Size(19,19)},
+    {cv::Size(21,21), cv::Size(23,23)}, {cv::Size(25,25), cv::Size(27,27)},
+    {cv::Size(29,29), cv::Size(31,31)}, {cv::Size(33,33), cv::Size(35,35)}
+};
+
+const double kGaborGamma = 0.3;
+
+const double kGaborSigmas[kNumBandsMax][2] = {
+    {2.0, 2.8}, {3.6, 4.5}, {5.4, 6.3}, {7.3, 8.2},
+    {9.2, 10.2}, {11.3, 12.3}, {13.4, 14.6}, {15.8, 17.0}
+};
+
+const double kGaborWavelens[kNumBandsMax][2] = {
+    {2.5, 3.5}, {4.6, 5.6}, {6.8, 7.9}, {9.1, 10.3},
+    {11.5, 12.7}, {14.1, 15.4}, {16.8, 18.2}, {19.7, 21.2}
+};
+
+class BIFImpl : public cv::face::BIF {
+public:
+    BIFImpl(int num_bands, int num_rotations) {
+        initUnits(num_bands, num_rotations);
+    }
+
+    virtual int getNumBands() const { return num_bands_; }
+
+    virtual int getNumRotations() const { return num_rotations_; }
+
+    virtual void compute(cv::InputArray image,
+                         cv::OutputArray features) const;
+
+private:
+    struct UnitParams {
+        cv::Size cell_size;
+        cv::Mat filter1, filter2;
+    };
+
+    void initUnits(int num_bands, int num_rotations);
+    void computeUnit(int unit_idx, const cv::Mat &img, cv::Mat &dst) const;
+
+    int num_bands_;
+    int num_rotations_;
+    std::vector<UnitParams> units_;
+};
+
+void BIFImpl::compute(cv::InputArray _image,
+                      cv::OutputArray _features) const {
+    cv::Mat image = _image.getMat();
+    CV_Assert(image.type() == CV_32F);
+
+    std::vector<cv::Mat> fea_units(units_.size());
+    int fea_dim = 0;
+
+    for (size_t i = 0; i < units_.size(); ++i) {
+        computeUnit(static_cast<int>(i), image, fea_units[i]);
+        fea_dim += fea_units[i].rows;
+    }
+
+    _features.create(fea_dim, 1, CV_32F);
+    cv::Mat fea = _features.getMat();
+
+    int offset = 0;
+    for (size_t i = 0; i < fea_units.size(); ++i) {
+        cv::Mat roi = fea.rowRange(offset, offset + fea_units[i].rows);
+        fea_units[i].copyTo(roi);
+        offset += fea_units[i].rows;
+    }
+    CV_Assert(offset == fea_dim);
+}
+
+void BIFImpl::initUnits(int num_bands, int num_rotations) {
+    CV_Assert(num_bands > 0 && num_bands <= kNumBandsMax);
+    CV_Assert(num_rotations > 0);
+
+    num_bands_ = num_bands;
+    num_rotations_ = num_rotations;
+
+    for (int ri = 0; ri < num_rotations; ++ri) {
+        double angle = CV_PI / num_rotations * ri;
+
+        for (int bi = 0; bi < num_bands; ++bi) {
+            cv::Mat kernel[2];
+            for (int i = 0; i < 2; ++i) {
+                kernel[i] = cv::getGaborKernel(
+                    kGaborSize[bi][i], kGaborSigmas[bi][i], angle,
+                    kGaborWavelens[bi][i], kGaborGamma, 0, CV_32F);
+
+                // Make variance for the Gaussian part of the Gabor filter
+                // the same across all filters.
+                kernel[i] /= 2 * kGaborSigmas[bi][i] * kGaborSigmas[bi][i]
+                             / kGaborGamma;
+            }
+
+            UnitParams unit;
+            unit.cell_size = kCellSizes[bi];
+            unit.filter1 = kernel[0];
+            unit.filter2 = kernel[1];
+            units_.push_back(unit);
+        }
+    }
+}
+
+void BIFImpl::computeUnit(int unit_idx, const cv::Mat &img,
+                          cv::Mat &dst) const {
+    cv::Mat resp1, resp2;
+    cv::filter2D(img, resp1, CV_32F, units_[unit_idx].filter1);
+    cv::filter2D(img, resp2, CV_32F, units_[unit_idx].filter2);
+
+    cv::Mat resp, sum, sumsq;
+    cv::max(resp1, resp2, resp);
+    cv::integral(resp, sum, sumsq);
+
+    int Hhalf = units_[unit_idx].cell_size.height / 2;
+    int Whalf = units_[unit_idx].cell_size.width / 2;
+
+    int nrows = (resp.rows + Hhalf - 1) / Hhalf;
+    int ncols = (resp.cols + Whalf - 1) / Whalf;
+    dst.create(nrows*ncols, 1, CV_32F);
+
+    for (int pos = 0, yc = 0; yc < resp.rows; yc += Hhalf) {
+        int y0 = std::max(0, yc - Hhalf);
+        int y1 = std::min(resp.rows, yc + Hhalf);
+
+        for (int xc = 0; xc < resp.cols; xc += Whalf, ++pos) {
+            int x0 = std::max(0, xc - Whalf);
+            int x1 = std::min(resp.cols, xc + Whalf);
+            int area = (y1-y0) * (x1-x0);
+
+            float mean = sum.at<float>(y1,x1) - sum.at<float>(y1,x0)
+                         - sum.at<float>(y0,x1) + sum.at<float>(y0,x0);
+            mean /= area;
+
+            double sd = sumsq.at<double>(y1,x1) - sumsq.at<double>(y1,x0)
+                        - sumsq.at<double>(y0,x1) + sumsq.at<double>(y0,x0);
+            sd = sqrt(sd / area - mean * mean);
+
+            dst.at<float>(pos) = static_cast<float>(sd);
+        }
+    }
+}
+
+}  // namespace
+
+cv::Ptr<cv::face::BIF> cv::face::createBIF(int num_bands, int num_rotations) {
+    return cv::Ptr<cv::face::BIF>(new BIFImpl(num_bands, num_rotations));
+}

modules/face/test/test_bif.cpp

+/*
+By downloading, copying, installing or using the software you agree to this
+license. If you do not agree to this license, do not download, install,
+copy or use the software.
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are
+disclaimed. In no event shall copyright holders or contributors be liable for
+any direct, indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.
+*/
+
+#include "test_precomp.hpp"
+
+TEST(CV_Face_BIF, can_create_default) {
+    cv::Ptr<cv::face::BIF> bif;
+    EXPECT_NO_THROW(bif = cv::face::createBIF());
+    EXPECT_FALSE(bif.empty());
+}
+
+TEST(CV_Face_BIF, fails_when_zero_bands) {
+    EXPECT_ANY_THROW(cv::face::createBIF(0));
+}
+
+TEST(CV_Face_BIF, fails_when_too_many_bands) {
+    EXPECT_ANY_THROW(cv::face::createBIF(9));
+}
+
+TEST(CV_Face_BIF, fails_when_zero_rotations) {
+    EXPECT_ANY_THROW(cv::face::createBIF(8, 0));
+}
+
+TEST(CV_Face_BIF, can_compute) {
+    cv::Mat image(60, 60, CV_32F);
+    cv::theRNG().fill(image, cv::RNG::UNIFORM, -1, 1);
+
+    cv::Ptr<cv::face::BIF> bif = cv::face::createBIF();
+    cv::Mat fea;
+    EXPECT_NO_THROW(bif->compute(image, fea));
+    EXPECT_EQ(cv::Size(1, 13188), fea.size());
+}

modules/face/test/test_main.cpp

+/*
+By downloading, copying, installing or using the software you agree to this
+license. If you do not agree to this license, do not download, install,
+copy or use the software.
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are
+disclaimed. In no event shall copyright holders or contributors be liable for
+any direct, indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.
+*/
+
+#include "test_precomp.hpp"
+
+CV_TEST_MAIN("cv")

modules/face/test/test_precomp.hpp

+/*
+By downloading, copying, installing or using the software you agree to this
+license. If you do not agree to this license, do not download, install,
+copy or use the software.
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are
+disclaimed. In no event shall copyright holders or contributors be liable for
+any direct, indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.
+*/
+
+#ifdef __GNUC__
+#  pragma GCC diagnostic ignored "-Wmissing-declarations"
+#  if defined __clang__ || defined __APPLE__
+#    pragma GCC diagnostic ignored "-Wmissing-prototypes"
+#    pragma GCC diagnostic ignored "-Wextra"
+#  endif
+#endif
+
+#ifndef __OPENCV_TEST_PRECOMP_HPP__
+#define __OPENCV_TEST_PRECOMP_HPP__
+
+#include <iostream>
+#include "opencv2/ts.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/face.hpp"
+#include "opencv2/face/bif.hpp"
+
+#endif