如何在Matlab中突出显示图像中的感兴趣区域

Question

我想知道如何在给定/指定位置的Matlab图像中突出显示感兴趣的蒙版/区域（或如何标记识别的对象）？

Answer 1

Another useful command is rectangle . Suppose rect holds the bounding box around the object (in format [ from_x from_y width height] ), then the following code will produce a box around the object in the image:

figure('Name', 'showing detected object');
imshow( img ); % show original image
hold all;  % hold image and plot rectangle on top
rectangle( 'Position', rect );

Answer 2

if you have all the vertexes of the region you are interested in you can simply use the line command. I post you how to draw a rectangle having the four vertexes (each a pair of x,y coordinates).

rect1=[a';b';c';d';a'];

line(rect1(:,1),rect1(:,2),'LineWidth',5);

I don't know if that is what you are looking for.

Answer 3

If you want the user to select a region on an image, then you can use the functions:

imrect
impoly
imellipse
imline

from the Image Processing toolkit.