Image Processing Toolbox

Selecting Objects in a Binary Image

You can use the bwselect function to select individual objects in a binary image. You specify pixels in the input image, and bwselect returns a binary image that includes only those objects from the input image that contain one of the specified pixels.

You can specify the pixels either noninteractively or with a mouse. For example, suppose you want to select objects in the image displayed in the current axes. You type

• BW2 = bwselect;
  

The cursor changes to a cross-hair when it is over the image. Click on the objects you want to select; bwselect displays a small star over each pixel you click on. When you are done, press Return. bwselect returns a binary image consisting of the objects you selected, and removes the stars.

See the reference page for bwselect for more information.

Connected-Component Labeling

Finding the Area of Binary Images