????????下面是OpenCV 3.3中基于CascadeClassifier類的LBP算法實(shí)現(xiàn)的人臉檢測，從結(jié)果上看，不如其它開源庫效果好，如libfacedetection，可參考?https://blog.csdn.net/fengbingchun/article/details/52964163?

#include "funset.hpp"
#include <string>
#include <vector>
#include <algorithm>
#include <opencv2/opencv.hpp>namespace {const std::string images_path_detect{ "E:/GitCode/Face_Test/testdata/detection/" };
const std::vector<std::string> images_name_detect{ "1.jpg", "2.jpg", "3.jpg", "4.jpg", "5.jpg", "6.jpg", "7.jpg", "8.jpg", "9.jpg", "10.jpg","11.jpg", "12.jpg", "13.jpg", "14.jpg", "15.jpg", "16.jpg", "17.jpg", "18.jpg", "19.jpg", "20.jpg" };void save_mats()
{const int width = 200, height = 200;cv::Mat dst(height * 5, width * 4, CV_8UC3);for (int i = 0; i < images_name_detect.size(); ++i) {std::string input_image = images_path_detect + "_" + images_name_detect[i];cv::Mat src = cv::imread(input_image, 1);if (src.empty()) {fprintf(stderr, "read image error: %s\n", input_image.c_str());return;}cv::resize(src, src, cv::Size(width, height), 0, 0, 4);int x = (i * width) % (width * 4);int y = (i / 4) * height;cv::Mat part = dst(cv::Rect(x, y, width, height));src.copyTo(part);}std::string output_image = images_path_detect + "result.png";cv::imwrite(output_image, dst);
}} // namespaceint test_face_detect_LBP()
{const std::string lbp_files_path{ "E:/GitCode/Face_Test/testdata/lbpcascades/" };const std::vector<std::string> lbpcascades_files{ "lbpcascade_frontalface.xml", "lbpcascade_frontalface_improved.xml", "lbpcascade_profileface.xml" };cv::CascadeClassifier face_cascade(lbp_files_path+lbpcascades_files[0]);if (face_cascade.empty()) {fprintf(stderr, "classifier hasn't been loaded\n");return -1;}// Search for many objects in the one image.const int flags = cv::CASCADE_SCALE_IMAGE;// Smallest object size.const cv::Size min_feature_size = cv::Size(10, 10);// How detailed should the search be. Must be larger than 1.0.const float search_scale_factor = 1.1f;// How much the detections should be filtered out. This should depend on how bad false detections are to your system.// min_neighbors=2 means lots of good+bad detections, and min_neighbors=6 means only good detections are given but some are missed.const int min_neighbors = 2;const int scaled_width = 320;for (int i = 0; i < images_name_detect.size(); ++i) {std::string name = images_path_detect + images_name_detect[i];cv::Mat bgr = cv::imread(name, 1);cv::Mat gray = cv::imread(name, 0);if (!bgr.data || bgr.channels() != 3 || !gray.data || gray.channels() != 1) {fprintf(stderr, "read image fail: %s\n", name.c_str());return -1;}fprintf(stdout, "image name: %s: size(width, height): (%d, %d)\n", images_name_detect[i].c_str(), gray.cols, gray.rows);// possibly shrink the image to run much faster.cv::Mat resized, equalized;float scale = gray.cols / (float)scaled_width;if (gray.cols > scaled_width) {// Shrink the image while keeping the same aspect ratio.int scaled_height = cvRound(gray.rows / scale);cv::resize(gray, resized, cv::Size(scaled_width, scaled_height));} else {// Access the input image directly, since it is already small.resized = gray;}// standardize the brightness and contrast to improve dark images.cv::equalizeHist(resized, equalized);std::vector<cv::Rect> objects;// Detect objects in the small grayscale image.face_cascade.detectMultiScale(equalized, objects, search_scale_factor, min_neighbors, flags, min_feature_size);fprintf(stdout, "image name: %s: detect face count: %d\n", images_name_detect[i].c_str(), objects.size());// Enlarge the results if the image was temporarily shrunk before detection.if (gray.cols > scaled_width) {for (int j = 0; j < objects.size(); ++j) {objects[j].x = cvRound(objects[j].x * scale);objects[j].y = cvRound(objects[j].y * scale);objects[j].width = cvRound(objects[j].width * scale);objects[j].height = cvRound(objects[j].height * scale);}}for (int j = 0; j < objects.size(); ++j) {// Make sure the object is completely within the image, in case it was on a border.objects[j].x = std::max(objects[j].x, 0);objects[j].y = std::max(objects[j].y, 0);if (objects[j].x + objects[j].width > gray.cols) {objects[j].x = gray.cols - objects[j].width;}if (objects[j].y + objects[j].height > gray.rows) {objects[j].y = gray.rows - objects[j].height;}cv::rectangle(bgr, objects[j], cv::Scalar(0, 255, 0), 2);}std::string save_result = images_path_detect + "_" + images_name_detect[i];cv::imwrite(save_result, bgr);}save_mats();return 0;
} 

????????檢測結(jié)果如下：

GitHub：?https://github.com/fengbingchun/Face_Test?

總結(jié)

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