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vlc
0001-Port-OpenCV-facedetect-example-to-C-API.patch
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File 0001-Port-OpenCV-facedetect-example-to-C-API.patch of Package vlc
From f53677bf35c6b0a669d799182d6383f350d1503d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de> Date: Sun, 12 Jan 2020 17:37:53 +0100 Subject: [PATCH] Port OpenCV facedetect example to C++ API Tested with: cvlc --video-filter=opencv_wrapper \ --opencv-filter-name opencv_example \ --opencv-chroma RGB32 \ --opencv-haarcascade-file /tmp/haarcascade_frontalface_default.xml \ v4l2:///dev/video0 --- modules/video_filter/opencv_example.cpp | 117 +++++++++++------------- 1 file changed, 52 insertions(+), 65 deletions(-) diff --git a/modules/video_filter/opencv_example.cpp b/modules/video_filter/opencv_example.cpp index a7a0bd7821..87a3451f1a 100644 --- a/modules/video_filter/opencv_example.cpp +++ b/modules/video_filter/opencv_example.cpp @@ -40,19 +40,16 @@ #include <vlc_image.h> #include "filter_event_info.h" -#include <opencv2/core/core_c.h> -#include <opencv2/core/core.hpp> -#include <opencv2/imgproc/imgproc_c.h> -#include <opencv2/imgproc/imgproc.hpp> -#include <opencv2/objdetect/objdetect.hpp> +#include <opencv2/opencv.hpp> /***************************************************************************** * filter_sys_t : filter descriptor *****************************************************************************/ -struct filter_sys_t +class filter_sys_t { - CvMemStorage* p_storage; - CvHaarClassifierCascade* p_cascade; +public: + cv::CascadeClassifier cascade; + std::vector<video_filter_region_info_t> event_info_storage; video_filter_event_info_t event_info; int i_id; }; @@ -92,15 +89,15 @@ static int OpenFilter( vlc_object_t *p_this ) filter_sys_t *p_sys; /* Allocate the memory needed to store the decoder's structure */ - if( ( p_filter->p_sys = p_sys = - (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL ) + p_filter->p_sys = p_sys = new filter_sys_t; + if(p_sys == nullptr) { return VLC_ENOMEM; } //init the video_filter_event_info_t struct p_sys->event_info.i_region_size = 0; - p_sys->event_info.p_region = NULL; + p_sys->event_info.p_region = nullptr; p_sys->i_id = 0; p_filter->pf_video_filter = Filter; @@ -116,8 +113,9 @@ static int OpenFilter( vlc_object_t *p_this ) //OpenCV init specific to this example char* filename = var_InheritString( p_filter, "opencv-haarcascade-file" ); - p_sys->p_cascade = (CvHaarClassifierCascade*)cvLoad( filename, 0, 0, 0 ); - p_sys->p_storage = cvCreateMemStorage(0); + if (!p_sys->cascade.load(filename)) { + msg_Err( p_filter, "Could not load %s", filename); + } free( filename ); return VLC_SUCCESS; @@ -131,14 +129,7 @@ static void CloseFilter( vlc_object_t *p_this ) filter_t *p_filter = (filter_t*)p_this; filter_sys_t *p_sys = p_filter->p_sys; - if( p_sys->p_cascade ) - cvReleaseHaarClassifierCascade( &p_sys->p_cascade ); - - if( p_sys->p_storage ) - cvReleaseMemStorage( &p_sys->p_storage ); - - free( p_sys->event_info.p_region ); - free( p_sys ); + delete p_sys; var_Destroy( p_filter->obj.libvlc, VIDEO_FILTER_EVENT_VARIABLE); } @@ -148,15 +139,13 @@ static void CloseFilter( vlc_object_t *p_this ) ****************************************************************************/ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic ) { - IplImage** p_img = NULL; - CvPoint pt1, pt2; - int scale = 1; + IplImage** p_img = nullptr; filter_sys_t *p_sys = p_filter->p_sys; - + if ((!p_pic) ) { msg_Err( p_filter, "no image array" ); - return NULL; + return nullptr; } //(hack) cast the picture_t to array of IplImage* p_img = (IplImage**) p_pic; @@ -165,50 +154,48 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic ) if ((!p_img[0])) //1st plane is 'I' i.e. greyscale { msg_Err( p_filter, "no image" ); - return NULL; + return nullptr; } + // Wrapper for IplImage* -> cv::Mat (reference, not copy) + cv::Mat gray = cv::cvarrToMat(p_img[0]); //perform face detection - cvClearMemStorage(p_sys->p_storage); - if( p_sys->p_cascade ) + if (p_sys->cascade.empty()) + msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" ); + + //we should make some of these params config variables + std::vector<cv::Rect> faces; + p_sys->cascade.detectMultiScale(gray, faces, + 1.15, 5, + CV_HAAR_DO_CANNY_PRUNING, + cv::Size(20, 20)); + //create the video_filter_region_info_t struct + if (faces.empty()) + return p_pic; + + //msg_Dbg( p_filter, "Found %d face(s)", faces.size()); + p_sys->event_info_storage.resize(faces.size()); + p_sys->event_info.i_region_size = faces.size(); + p_sys->event_info.p_region = p_sys->event_info_storage.data(); + if( !p_sys->event_info.p_region ) + return nullptr; + + //populate the video_filter_region_info_t struct + for( int i = 0; i < faces.size(); i++ ) { - //we should make some of these params config variables - CvSeq *faces = cvHaarDetectObjects( p_img[0], p_sys->p_cascade, - p_sys->p_storage, 1.15, 5, - CV_HAAR_DO_CANNY_PRUNING, - cvSize(20, 20) ); - //create the video_filter_region_info_t struct - if (faces && (faces->total > 0)) - { - //msg_Dbg( p_filter, "Found %d face(s)", faces->total ); - free( p_sys->event_info.p_region ); - p_sys->event_info.p_region = (video_filter_region_info_t*) - calloc( faces->total, sizeof(video_filter_region_info_t)); - if( !p_sys->event_info.p_region ) - return NULL; - p_sys->event_info.i_region_size = faces->total; - } - - //populate the video_filter_region_info_t struct - for( int i = 0; i < (faces ? faces->total : 0); i++ ) - { - CvRect *r = (CvRect*)cvGetSeqElem( faces, i ); - pt1.x = r->x*scale; - pt2.x = (r->x+r->width)*scale; - pt1.y = r->y*scale; - pt2.y = (r->y+r->height)*scale; - cvRectangle( p_img[0], pt1, pt2, CV_RGB(0,0,0), 3, 8, 0 ); - - *(CvRect*)(&(p_sys->event_info.p_region[i])) = *r; - p_sys->event_info.p_region[i].i_id = p_sys->i_id++; - p_sys->event_info.p_region[i].p_description = "Face Detected"; - } - - if (faces && (faces->total > 0)) //raise the video filter event - var_TriggerCallback( p_filter->obj.libvlc, VIDEO_FILTER_EVENT_VARIABLE ); + const cv::Rect& r = faces[i]; + cv::rectangle(gray, r, CV_RGB(0,0,0), 3); + + p_sys->event_info.p_region[i].i_x = r.x; + p_sys->event_info.p_region[i].i_y = r.y; + p_sys->event_info.p_region[i].i_width = r.width; + p_sys->event_info.p_region[i].i_height = r.height; + + p_sys->event_info.p_region[i].i_id = p_sys->i_id++; + p_sys->event_info.p_region[i].p_description = "Face Detected"; } - else - msg_Err( p_filter, "No cascade - is opencv-haarcascade-file valid?" ); + + var_TriggerCallback( p_filter->obj.libvlc, VIDEO_FILTER_EVENT_VARIABLE ); return p_pic; } -- 2.24.1
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