Lab 2

Todd Goldfinger

1/11/03

Goal: Write an algorithm to do perform color image segmentation.

I implemented RGB color segmentation in matlab. The algorithm divides the image into three

color planes and keeps an intensity range in a square region specified by the user in each plane. All

other intensities are set to zero. This is equivalent to segmenting a small color cube out of the full

color cube. A binary image is made out of the three planes by looking for the non-zero entries in

all three planes. The function prototype is below.

function segimg=segment(img,R,G,B,Rrange,Grange,Brange)

R, G, and B specify the center of the cube to segment from the full color

cube. Rrange, Grange, and Brange are the half-lengths of the cube. I

tested the algorithm on the image below. I chose the following parameters

to segment out the dark regions.

R	G	B	Rrange	Grange	Brange
25	25	25	40	40	40

A) Original image.

B) Original image with segmentation overlay.

C) Segmentation only.

From B, you can see that the segmentation got all the dark areas (and possibly a little more)