matlab计算iou

可以使用以下代码计算两个矩形框之间的交并比（IoU）：

function iou = bbox_iou(bbox1, bbox2)
% bbox1和bbox2分别是两个矩形框的坐标，格式为[xmin, ymin, xmax, ymax]
    if ~isempty(bbox1) && ~isempty(bbox2)
        bbox1 = double(bbox1);
        bbox2 = double(bbox2);
        intersect_bbox = [max(bbox1(1), bbox2(1)), max(bbox1(2), bbox2(2)), min(bbox1(3), bbox2(3)), min(bbox1(4), bbox2(4))];
        w = intersect_bbox(3) - intersect_bbox(1) + 1;
        h = intersect_bbox(4) - intersect_bbox(2) + 1;
        if w > 0 && h > 0
            intersect_area = w * h;
            bbox1_area = (bbox1(3) - bbox1(1) + 1) * (bbox1(4) - bbox1(2) + 1);
            bbox2_area = (bbox2(3) - bbox2(1) + 1) * (bbox2(4) - bbox2(2) + 1);
            iou = intersect_area / (bbox1_area + bbox2_area - intersect_area);
        else
            iou = 0;
        end
    else
        iou = 0;
    end
end

其中，bbox1和bbox2分别是两个矩形框的坐标，格式为[xmin, ymin, xmax, ymax]。返回值iou为交并比。