inROI

Query if points are located in ROI

Syntax

tf = inROI(ROI,x,y)

tf = inROI(ROI,x,y,z)

Description

tf = inROI(ROI,x,y) returns a logical array, tf, that indicates whether points with coordinates (x,y) are inside or outside the 2-D ROI.

tf = inROI(ROI,x,y,z) returns a logical array, tf, that indicates whether points with coordinates (x,y,z) are inside or outside the 3-D Cuboid ROI.

Examples

Query Points Inside Rectangular ROI

Read an image into the workspace and display it.

I = imread('trailer.jpg');
figure
imshow(I)

Draw a rectangular ROI on the image, using the Position argument to specify the position of the rectangle as [xmin,ymin,width,height].

h = drawrectangle('Position',[190 308 682 276],'StripeColor','r');

Specify the x- and y-coordinates of three points. The last point is the upper left corner of the rectangular ROI.

xcoords = [335 335 190];
ycoords = [200 400 308];

Query if the three points are inside the ROI.

tf = inROI(h,xcoords,ycoords)

tf = 3×1 logical array

   0
   1
   1

Input Arguments

ROI — Region of interest

ROI object

Region of interest, specified as an ROI object of one of these types:

AssistedFreehand	Freehand
Circle	Polygon
Cuboid	Rectangle
Ellipse

x — X-coordinates of query points

numeric scalar | numeric vector

X-coordinates of the query points, specified as a numeric scalar or vector.

y — Y-coordinates of query points

numeric scalar | numeric vector

Y-coordinates of the query points, specified as a numeric scalar or vector.

z — Z-coordinates of query points

numeric scalar | numeric vector

Z-coordinates of the query points, specified as a numeric scalar or vector.

Output Arguments

tf — Status of query points

logical array

Status of query points, returned as a logical array. The array is the same length as the input arrays x, y, and z. Elements of the logical array set to true indicate that the corresponding query point is inside the ROI. Elements that are false indicate the point is not inside the ROI.

Version History

Introduced in R2018b