在应用程序设计器GUI中限制ROI时出错-Matlab

Question

如何创建矩形的投资回报率并使用应用设计器设置阈值？

这是我得到的错误，它另外打开一个用于标记ROI的图形：

Error using imbinarize
Expected I to be one of these types:

uint8, uint16, uint32, int8, int16, int32, single, double

Instead its type was images.roi.Rectangle.

Error in imbinarize>validateImage (line 262)
validateattributes(I,supportedClasses,supportedAttribs,mfilename,'I');

Error in imbinarize>parseInputs (line 198)
validateImage(I);

Error in imbinarize (line 134)
[I,isNumericThreshold,options] = parseInputs(I,varargin{:});

代码：

    function ButtonPushed(app, event)

        I = imread('coins.png');
        imshow(I,'Parent', app.imageAxes);
        level = graythresh(I)
        roiRect = drawrectangle()
        BW = imbinarize(roiRect,level);
    end

Answer 1

[请尝试使用此代码，drawrectangle()函数将返回一个对象，而不是图像，您必须从该对象获取位置并根据此裁剪您的ROI。

    function ButtonPushed(app, event)

        I = imread('coins.png');
        imshow(I,'Parent', app.imageAxes);
        level = graythresh(I)
        roiRect = drawrectangle()
        roi = imcrop(I,roiRect.Position);
        BW = imbinarize(roi,level);
    end