小编jos*_*and的帖子

我使用OpenCv查找与参考图像上的模板匹配的区域.当代码找到与模板匹配的区域时,在该区域周围绘制一个矩形,但我想要的是当代码找不到该区域时代码不会绘制任何矩形

码:

IplImage    *res;
    CvPoint     minloc, maxloc;
    double      minval, maxval;
    int         img_width, img_height;
    int         tpl_width, tpl_height;
    int         res_width, res_height;

    NSString *path = [[NSBundle mainBundle] pathForResource:@"reference" ofType:@"jpg"];
    reference.image = [UIImage imageWithContentsOfFile:path];

    NSString *pathPatron = [[NSBundle mainBundle] pathForResource:@"template" ofType:@"jpg"];
    template.image = [UIImage imageWithContentsOfFile:pathPatron];

    IplImage *img = [self CreateIplImageFromUIImage:original.image];//
    IplImage *tpl = [self CreateIplImageFromUIImage:patron.image];

    img_width  = img->width;
    img_height = img->height;
    tpl_width  = tpl->width;
    tpl_height = tpl->height;
    res_width  = img_width - tpl_width + 1;
    res_height = img_height - tpl_height + 1;    
    res = cvCreateImage( …