【MATLAB数字图像处理】伪彩色增强

川长思鸟来 2024-04-17 14:30 79阅读 0赞

伪彩色增强主要有密度分割法和空间域灰度级-彩色变换法。  
利用密度分割法来实现图像的伪彩色增强。

clear all;
    I = imread('lenna.jpg');
    I = rgb2gray(I);
    figure,
    subplot(1,2,1);
    imshow(I);
    title('原始图像')
    I = double(I);
    c = zeros(size(I));
    d = ones(size(I))*255;
    pos = find(((I>=32)&(I<63))|((I>=96)&(I<127))|((I>=154)&(I<191))|((I>=234)&(I<=255)));
    c(pos)=d(pos);
    f(:,:,3)=c;
    c = zeros(size(I));
    d = ones(size(I))*255;
    pos = find(((I>=64)&(I<95))|((I>=96)&(I<127))|((I>=192)&(I<233))|((I>=234)&(I<=255)));
    c(pos)=d(pos);
    f(:,:,2)=c;
    c = zeros(size(I));
    d = ones(size(I))*255;
    pos = find(((I>=128)&(I<154))|((I>=154)&(I<191))|((I>=192)&(I<233))|((I>=234)&(I<=255)));
    c(pos)=d(pos);
    f(:,:,1)=c;
    f = uint8(f);
    subplot(1,2,2);
    imshow(f);
    title('密度分割法伪彩色增强')

运行结果如图所示：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx_size_16_color_FFFFFF_t_70]  
利用空间域灰度级-彩色变换法对图像进行伪彩色增强。

clear all;
    I = imread('lenna.jpg');
    I = rgb2gray(I);
    figure,
    subplot(1,2,1);
    imshow(I);
    title('原始图像')
    I = double(I);
    [M,N] = size(I);
    L = 256;
    for i=1:M
        for j=1:N
            if I(i,j)<=L/4;
                R(i,j)=0;
                G(i,j)=4*I(i,j);
                B(i,j)=L;
            else
                if I(i,j)<=L/2;
                     R(i,j)=0;
                     G(i,j)=L;
                     B(i,j)=4*I(i,j)+2*L;
                else
                    if I(i,j)<=3*L/4
                        R(i,j)=4*I(i,j)-2*L;
                        G(i,j)=L;
                        B(i,j)=0;
                    else
                        R(i,j)=L;
                        G(i,j)=-4*I(i,j)+4*L;
                        B(i,j)=0;
                    end
                end
            end
        end
    end
    for i=1:M
        for j=1:N
            C(i,j,1)=R(i,j);
            C(i,j,2)=G(i,j);
            C(i,j,3)=B(i,j);
        end
    end
    C=uint8(C);
    subplot(1,2,2);
    imshow(C);
    title('空间域灰度级-彩色变换法的伪彩色增强')

运行结果如图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190827141652294.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2019082714190486.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xodzE5OTMxMjAx,size_16,color_FFFFFF,t_70