数字图像处理实验（17）：PROJECT 06-04，Color Image Segmentation

实验报告：

Objective:
Color image segmentation is a big issue in image processing. This students need to know the basics of this topic.
Main requirements:
Ability of programming with C, C++, or Matlab.
Instruction manual:
Download Fig. 6.28(b) and duplicate Example 6.15, but segment instead the darkest regions in the image.

本实验是彩色图像分割，从彩色图像中分割出特定颜色。这里我选了红色，从下面图片分割红色出来，主要是草莓的部分有较多的红色分量。
原图像：

实验代码：

%close all;clc;clear all;%img = imread('Fig6.30(01).jpg');figure;subplot(2, 2, 1);imshow(img);title('original image');%img1 = im2double(img);R = img1(:, :, 1);G = img1(:, :, 2);B = img1(:, :, 3);subplot(2, 3, 4);imshow(R);title('Red');subplot(2, 3, 5);imshow(G);title('Green');subplot(2, 3, 6);imshow(B);title('Blue');%R1 = R(129:256, 86:170);R1_ave = mean(mean(R1(:)));[M, N] = size(R1);sd = 0.0;for i = 1:M    for j = 1:N        sd = sd + (R1(i, j) - R1_ave) * (R1(i, j) - R1_ave);    endendR1_d = sqrt(sd/(M*N));R2 = zeros(size(img, 1), size(img, 2));index = find((R > R1_ave - 1.25*R1_d) & (R < R1_ave + 1.25*R1_d));R2(index) = 1;subplot(2, 2, 2);imshow(R2);title('segment red');

实验结果：

从颜色分割的结果来看，白色部分主要为草莓的那部分区域，也正好是我们所要区分的红色的区域。