opencv圖像更新gtk中的視頻流linux與C編程

Question

我使用的是opencv 1.0.0和gtk2.0。我想從視頻流中連續抓取圖像。到目前爲止，我已經成功地抓住了靜止圖像。這是非標準的IP攝像機，不是VGA/USB/V4L，所以需要知道明確的方法來連續刷新或更新視頻流的圖像！

GtkWidget *image; 

... 
... 

IplImage* bayerImage = NULL; 
IplImage* rgbImage = NULL; 

... 
... 
... 

cvCvtColor(bayerImage, rgbImage, CV_BayerBG2RGB); 
// Usually opencv image is BGR, so we need to change it to RGB 

pix = gdk_pixbuf_new_from_data ((guchar*)rgbImage->imageData, 
       GDK_COLORSPACE_RGB, 
       FALSE, 
       rgbImage->depth, 
       rgbImage->width, 
       rgbImage->height, 
       (rgbImage->widthStep), 
        NULL, 
        NULL); 
image = gtk_image_new_from_pixbuf (pix); 

Answer 1

/* (c) 2010 Virgoptrex. Feel Free to use. Leave credits intact */ 

#include gtk/gtk.h 

gint t=0; 

    gboolean 
    expose_event_callback (GtkWidget *widget, GdkEventExpose *event, gpointer data) 
    { 


    //g_object_ref_sink (widget->window); 

    // gdk_drawable_ref (widget->window); 

     gdk_draw_arc (widget->window, 
        widget->style->fg_gc[GTK_WIDGET_STATE (widget)], 
        TRUE, 
        0, 0, widget->allocation.width, widget->allocation.height, 
        0, 64 * 18*t); 

     //gdk_drawable_unref (widget->window); 



     return TRUE; 
    } 



static gboolean 
time_handler(GtkWidget *widget) 
{  


gtk_widget_queue_draw(GTK_WIDGET(widget)); 

    if (t<20) 
    { t++; } 
    else if (t >=20) 
    { t=0; } 

printf("hello %d\n",t); 
    return TRUE; 


} 

int main(int argc, 
      char *argv[]) 
{ 
    GtkWidget *window; 
    GtkWidget *aspect_frame; 
    GtkWidget *drawing_area; 
    gtk_init (&argc, &argv); 

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL); 



    gtk_window_set_title (GTK_WINDOW (window), "Aspect Frame"); 
    g_signal_connect (G_OBJECT (window), "destroy", 
        G_CALLBACK (gtk_main_quit), NULL); 
    gtk_container_set_border_width (GTK_CONTAINER (window), 10); 

    /* Create an aspect_frame and add it to our toplevel window */ 

    aspect_frame = gtk_aspect_frame_new ("2x1", /* label */ 
             0.5, /* center x */ 
             0.5, /* center y */ 
             2, /* xsize/ysize = 2 */ 
             FALSE /* ignore child's aspect */); 

    gtk_container_add (GTK_CONTAINER (window), aspect_frame); 
    gtk_widget_show (aspect_frame); 

    /* Now add a child widget to the aspect frame */ 

    drawing_area = gtk_drawing_area_new(); 

    /* Ask for a 200x200 window, but the AspectFrame will give us a 200x100 
    * window since we are forcing a 2x1 aspect ratio */ 
    gtk_widget_set_size_request (drawing_area, 200, 200); 
    gtk_container_add (GTK_CONTAINER (aspect_frame), drawing_area); 
    gtk_widget_show (drawing_area); 

    g_signal_connect (G_OBJECT (drawing_area), "expose_event", 
         G_CALLBACK (expose_event_callback), NULL); 

    g_timeout_add(100, (GSourceFunc) time_handler, (gpointer)drawing_area); 


    gtk_widget_show (window); 
    gtk_main(); 
    return 0; 
}