MATLAB初體驗(灰階圖rgb2gray(),二值化,負片,旋轉圖像)

1.程式碼(二值化):

    clear all; clc;% 清空

    filepath=['C:\Users\student\Desktop\p123']; %讀圖

    c=imread(filepath,'jpg');%副檔名

    br=rgb2gray(c);%轉成灰階圖

        for(i=1:1:107)%長107

            for(j=1:1:160)%寬160

                  if (c(i,j)>128)%如果大於128 轉成256 白

                     br(i,j)=256;

                  else

                     br(i,j)=1;%小於則黑

                  end

            end

        end

    figure(1),imshow(br);%印出

2.程式碼(負片):

    clear all; clc;

    filepath=['C:\Users\student\Desktop\p123']; 

    c=imread(filepath,'jpg');

    br=rgb2gray(c);

     for(i=1:1:107)

            for(j=1:1:160)     

                br(i,j)=257 - c(i,j);%用257減 

            end

     end

    figure(1),imshow(c);  

    figure(2),imshow(br);

3.程式碼(旋轉):

%旋轉180度

    clear all; clc;

    filepath=['C:\Users\student\Desktop\p123']; %讀圖

    c=imread(filepath,'jpg');%°讀副檔名

     for(i=1:1:107)

            for(j=1:1:160)     

                br(i,j)=c(108-i,161-j);% EX:(1.1)位置值轉給(108-1,161-1)位置

                %以此類推

            end

     end

    figure(1),imshow(c);  

    figure(2),imshow(br);