Image Processing Toolbox

Step 7: Watershed Segmentation

Use the watershed function to accomplish Watershed segmentation of the imposed minima image.

• wat = watershed(Iimpose);
  

The watershed function returns a label matrix containing nonnegative numbers that correspond to watershed regions. Pixels that do not fall into any watershed region are given a pixel value of 0.

A good way to visualize a label matrix is to convert it to a color image, using the label2rgb function. In the color version of the image, each labeled region displays in a different color and the pixels that separate the regions display white.

• rgb = label2rgb(wat);
  figure, imshow(rgb);
  title('watershed segmented image');
  
  
  

Step 6: Detect Intensity Valleys

Step 8: Extract Features from Label Matrix