注解图像显示并绘制 ROI

在图像上叠加掩膜和标签，并绘制多个形状的感兴趣区域

工具箱支持一组对象，您可以使用这些对象创建许多形状的 ROI，例如圆形、椭圆形、多边形、矩形和手绘形状。创建对象后，您可以修改其形状、位置、外观和行为。

函数

`imoverlay`	将二值掩膜刻入二维图像
`labeloverlay`	Overlay label matrix regions on 2-D image
`uipaint`	Draw using paintbrush in viewer window (自 R2026a 起)

uidraw Interactively draw ROI in viewer window (自 R2026a 起)

`drawassisted`	Create customizable freehand ROI with assistance from object edges
`drawcircle`	Create customizable circular ROI
`drawcrosshair`	Create customizable crosshair ROI
`drawcuboid`	Create customizable cuboidal ROI
`drawellipse`	Create customizable elliptical ROI
`drawfreehand`	Create customizable freehand ROI
`drawline`	Create customizable linear ROI
`drawpoint`	Create customizable point ROI
`drawpolygon`	Create customizable polygonal ROI
`drawpolyline`	Create customizable polyline ROI
`drawrectangle`	Create customizable rectangular ROI

`AssistedFreehand`	Assisted freehand region of interest
`Circle`	Circular region of interest
`Crosshair`	Crosshair region of interest
`Cuboid`	Cuboidal region of interest
`Ellipse`	Elliptical region of interest
`Freehand`	Freehand region of interest
`Line`	Line region of interest
`Point`	Point region of interest
`Polygon`	Polygonal region of interest
`Polyline`	Polyline region of interest
`Rectangle`	Rectangular region of interest

`draw`	开始以交互方式绘制 ROI
`reduce`	Reduce density of points in ROI
`beginDrawingFromPoint`	Begin drawing ROI from specified point
`inROI`	Query if points are located in ROI
`bringToFront`	Bring ROI to front of Axes stacking order
`wait`	Block MATLAB command line until ROI operation is finished

Create ROI Shapes
ROI objects represent ROIs as geometric and hand-drawn shapes.

Subsample or Simplify a Freehand ROI
This example shows how to subsample or reduce the number of points in a Freehand ROI object.
Create Freehand ROI Editing Tool
This example shows how to create a simple tool to edit the shape of a freehand ROI using another ROI object.
Use Wait Function After Drawing ROI
This example shows how to define a custom wait function that blocks the MATLAB® command line until you finish positioning a rectangle.
Create Image Comparison Tool Using ROIs
This example shows how to use the new ROI functions to create an interactive image comparison tool.

Add and edit point and line annotations in a Viewer object displaying a 3-D Brain MRI scan.

Display a detailed region of a blocked image selected interactively using ROI tools.