在examples/darknet.c文件中若使用detect命令可以看到调用了test_detector.

...

else if (0 == strcmp(argv[1], "detect")){

        float thresh = find_float_arg(argc, argv, "-thresh", .24);

        char *filename = (argc > 4) ? argv[4]: 0;

        char *outfile = find_char_arg(argc, argv, "-out", 0);

        int fullscreen = find_arg(argc, argv, "-fullscreen");

        test_detector("cfg/coco.data", argv[2], argv[3], filename, thresh, .5, outfile, fullscreen);

	    }

...

test_detector位于examples/detector.c :562,对其识别结果调用了draw_detections，在入口

void draw_detections(image im, detection *dets, int num, float thresh, char **names, image **alphabet, int classes)

中，存储了识别结果的是dets，识别数量为num.

dets结构为：

typedef struct detection{

    box bbox;

    int classes;

    float *prob;

    float *mask;

    float objectness;

    int sort_class;

} detection;

box 结构为：

typedef struct{

    float x, y, w, h;

} box;

那是不是直接使用如下的访问方式就行了呢？

printf("x=%lf,y=%lf,w=%lf,h=%lf",

        dets->bbox.x,dets->bbox.y,

        dets->bbox.w,dets->bbox.h);

但是运行结果并不如意

x=0.324301,y=0.611036,w=0.313848,h=0.573097

其实获取正确的矩形数据应该在draw_detections里寻找才是，果不其然，bingo！

void draw_detections(image im, detection *dets, int num, float thresh, char **names, image **alphabet, int classes)

{

...

	for(i = 0; i < num; ++i){

        ...

		int left  = (b.x-b.w/2.)*im.w;

		int right = (b.x+b.w/2.)*im.w;

		int top   = (b.y-b.h/2.)*im.h;

		int bot   = (b.y+b.h/2.)*im.h;

		if(left < 0) left = 0;

		if(right > im.w-1) right = im.w-1;

		if(top < 0) top = 0;

		if(bot > im.h-1) bot = im.h-1;

		// add

		printf("left=%d,right=%d,top=%d,bot=%d\n",left,right,top,bot);

		// end add

		...

}

将其在test_detector中嵌入，运行效果如下：

left=128,right=369,top=186,bot=517

left=533,right=621,top=94,bot=157

left=465,right=679,top=71,bot=169

left=205,right=576,top=151,bot=449

___________________________

(left,top)-----------

|				    |

|				    |

---------------(right,bot)

---

>[1] box,detection的定义在include\darknet.h
>[2] detector.c在examples\detector.c
>[3] image.c在src\image.c