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OpenCVでフレーム間の差分を計算して、閾値を超えた箇所だけ描写する。
ofImage.getTexture().bind(), ofImage.getTexture().unbind()でofDrawBox()へ反映。
setup()関数内でofDisableArbTex()をするのを忘れないようにする。
Calculate the difference between frames in OpenCV and draw only the parts that exceed the threshold.
Reflect it to ofDrawBox() by ofImage.getTexture().bind(), ofImage.getTexture().unbind().
Don’t forget to do ofDisableArbTex() in the setup() function.
[ Source ]
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#pragma once #include "ofMain.h" #include "opencv2/opencv.hpp" class ofApp : public ofBaseApp { public: void setup(); void update(); void draw(); void keyPressed(int key) {}; void keyReleased(int key) {}; void mouseMoved(int x, int y) {}; void mouseDragged(int x, int y, int button) {}; void mousePressed(int x, int y, int button) {}; void mouseReleased(int x, int y, int button) {}; void windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; ofEasyCam cam; cv::VideoCapture cap; cv::Size cap_size; int number_of_frames; vector<cv::Mat> frame_list; float rect_size; vector<float> draw_rect_size_list; vector<cv::Mat> rect_frame_list; vector<unique_ptr<ofImage>> rect_image_list; vector<cv::Rect> cv_rect_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofEnableDepthTest(); ofDisableArbTex(); this->cap_size = cv::Size(640, 360); this->rect_size = 10; for (int x = 0; x < this->cap_size.width; x += this->rect_size) { for (int y = 0; y < this->cap_size.height; y += this->rect_size) { auto image = make_unique<ofImage>(); image->allocate(this->rect_size, this->rect_size, OF_IMAGE_COLOR); cv::Mat frame = cv::Mat(cv::Size(image->getWidth(), image->getHeight()), CV_MAKETYPE(CV_8UC3, image->getPixels().getNumChannels()), image->getPixels().getData(), 0); cv::Rect rect = cv::Rect(x, y, this->rect_size, this->rect_size); this->rect_image_list.push_back(move(image)); this->cv_rect_list.push_back(rect); this->rect_frame_list.push_back(frame); this->draw_rect_size_list.push_back(this->rect_size); } } auto file_path = "D:\\MP4\\Pexels Videos 2880.mp4"; this->cap.open(file_path); this->number_of_frames = this->cap.get(cv::CAP_PROP_FRAME_COUNT); for (int i = 0; i < this->number_of_frames; i++) { cv::Mat src, tmp; this->cap >> src; if (src.empty()) { continue; } cv::resize(src, tmp, this->cap_size); cv::cvtColor(tmp, tmp, cv::COLOR_BGR2RGB); this->frame_list.push_back(tmp); } } //-------------------------------------------------------------- void ofApp::update() { int frame_index = (int)(ofGetFrameNum() * 0.42) % this->number_of_frames; int next_frame_index = (frame_index + 1) % this->number_of_frames; for (int i = 0; i < this->draw_rect_size_list.size(); i++) { this->draw_rect_size_list[i] = this->draw_rect_size_list[i] <= 0 ? 0 : this->draw_rect_size_list[i] - 0.3; } if (frame_index < next_frame_index) { cv::Mat gap = this->frame_list[frame_index] - this->frame_list[next_frame_index]; for (int i = 0; i < this->cv_rect_list.size(); i++) { int x = this->cv_rect_list[i].x + this->rect_size * 0.5; int y = this->cv_rect_list[i].y + this->rect_size * 0.5; cv::Vec3b* gap_value = gap.ptr<cv::Vec3b>(y, 0); cv::Vec3b* color_value = this->frame_list[frame_index].ptr<cv::Vec3b>(y, 0); cv::Vec3b gv = gap_value[x]; cv::Vec3b cv = color_value[x]; if ((gv[0] + gv[1] + gv[2]) > 50) { this->draw_rect_size_list[i] = this->draw_rect_size_list[i] <= this->rect_size ? this->rect_size : this->rect_size; } } } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofRotateX(180); ofFill(); for (int i = 0; i < this->rect_frame_list.size(); i++) { ofPushMatrix(); ofTranslate(this->cv_rect_list[i].x + 50 - ofGetWidth() * 0.5, this->cv_rect_list[i].y + 180 - ofGetHeight() * 0.5, -1); ofRotateX(180); int frame_index = (int)(ofGetFrameNum() * 0.42) % this->number_of_frames; cv::Mat tmp_box_image(this->frame_list[frame_index], this->cv_rect_list[i]); tmp_box_image.copyTo(this->rect_frame_list[i]); if (this->draw_rect_size_list[i] > 0) { this->rect_image_list[i]->update(); this->rect_image_list[i]->getTexture().bind(); auto height = this->draw_rect_size_list[i] * 5; ofSetColor(ofMap(this->draw_rect_size_list[i], 0, this->rect_size, 0, 255)); ofDrawBox(glm::vec3(), this->rect_size); this->rect_image_list[i]->unbind(); } ofPopMatrix(); } ofNoFill(); ofSetColor(39); ofDrawBox(glm::vec3(this->rect_size * 0.5, this->rect_size * -0.5, 0), 640, 360, this->rect_size); this->cam.end(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |