matlab圖像的幾何變換與彩色處理

1、實驗四、圖像的幾何變換與彩色處理一、實驗目的1理解和掌握圖像的平移、垂直鏡像變換、水平鏡像變換、縮放和旋轉(zhuǎn)的原理和應用;2熟悉圖像幾何變換的MATLAB操作和基本功能3 掌握彩色圖像處理的基本技術二、實驗步驟1 啟動MATLAB程序,讀入圖像并對圖像文件分別進行平移、垂直鏡像變換、水平鏡像變換、縮放和旋轉(zhuǎn)操作%平移>> flowerImg=imread('flower.jpg'>> se=translate(strel(1,100 100;>> img2=imdilate(flowerImg,se;>> subplot(1,2,1

2、;>> imshow(flowerImg;>> subplot(1,2,2;>> imshow(img2; I1=imread('flower.jpg'I1=double(I1;H=size(I1;I2(1:H(1,1:H(2,1:H(3=I1(H(1:-1:1,1:H(2,1:H(3; I3(1:H(1,1:H(2,1:H(3=I1(1:H(1,H(2:-1:1,1:H(3; Subplot(2,2,1;Imshow(uint8(I1;Title('原圖'Subplot(2,2,2;Imshow(uint8(I3;Title

3、('水平鏡像'Subplot(2,2,3;Imshow(uint8(I2;Title('垂直鏡像' img1=imread('flower.jpg'figure,imshow(img1;%縮放img2=imresize(img1,0.25;figure,imshow(img2;imwrite(img2,'a2.jpg'%旋轉(zhuǎn)img3=imrotate(img1,90; figure,imshow(img3; imwrite(img3,'a3.jpg' 2 實驗如下操作:(1改變圖像縮放比例f= imread(

4、9;flower.jpg'T= 0.5 0 0; 0 0.5 0; 0 0 1;tform=maketform('affine',T;g1,xdata1,ydata1=imtransform(f,tform,'FillValue',255;T= 1 0 0; 0 1 0; 0 0 1;tform=maketform('affine',T;g2,xdata2,ydata2=imtransform(f,tform,'FillValue',255;T= 1.5 0 0; 0 1.5 0; 0 0 1;tform=maketfor

5、m('affine',T;g3,xdata3,ydata3=imtransform(f,tform,'FillValue',255;hold onimshow(g3,'XData', xdata3, 'YData', ydata3hold onimshow(g2,'XData', xdata2, 'YData', ydata2hold onimshow(g1,'XData', xdata1, 'YData', ydata1axis autoaxis on (2改變圖像

6、的旋轉(zhuǎn)角度,f= imread('flower.jpg'theta=3*pi/4;T=cos(theta sin(theta 0; -sin(theta cos(theta 0; 0 0 1; tform=maketform('affine',T;g3,xdata3,ydata3=imtransform(f,tform,'FillValue',255; theta=pi;T=cos(theta sin(theta 0; -sin(theta cos(theta 0; 0 0 1; tform=maketform('affine',

7、T;g4,xdata4,ydata4=imtransform(f,tform,'FillValue',255; imshow(f;hold onimshow(g3,'XData', xdata3, 'YData', ydata3hold onimshow(g4,'XData', xdata4, 'YData', ydata4axis autoaxis on 觀察變換結果,要求把經(jīng)過不同類型幾何變換的圖像和原圖像在同一坐標系內(nèi)顯示輸出(請參考課件或教材上的代碼3 讀入一幅彩色圖像,進行如下圖像處理:(1在RGB彩色空

8、間中對圖像進行模糊和銳化處理rgb= imread('flower.jpg'figure; imshow(rgb; title('原圖'%平滑濾波r=rgb(:,:,1;g=rgb(:,:,2;b=rgb(:,:,3;m=fspecial('average',8,8;r_filtered=imfilter(r,m;g_filtered=imfilter(g,m;b_filtered=imfilter(b,m;rgb_filtered=cat(3,r_filtered,g_filtered,b_filtered;figure; imshow(rgb

9、_filtered; title('模糊后'imwrite(rgb_filtered, 'RGB彩色空間模糊后.jpg'%拉普拉斯lapMatrix=1 1 1;1 -8 1;1 1 1;i_tmp=imfilter(rgb,lapMatrix,'replicate'i_sharped=imsubtract(rgb,i_tmp;figure; imshow(i_sharped; title('銳化后' imwrite(i_sharped, 'RGB彩色空間銳化后.jpg' (2在HSI彩色空間中,對H分量圖像進行模

10、糊和銳化處理,轉(zhuǎn)換回RGB格式并觀察效果(3在HSI彩色空間中,對S分量圖像進行模糊和銳化處理,轉(zhuǎn)換回RGB格式并觀察效果(4在HSI彩色空間中,對I分量圖像進行模糊和銳化處理,轉(zhuǎn)換回RGB格式并觀察效果fc = imread('flower.jpg'h = rgb2hsi(fc;H = h (:,:,1;S = h (:,:,2;I = h (:,:,3;subplot(3,3,1;imshow(fc; title('原圖'%平滑濾波m=fspecial('average',8,8;h_filtered=imfilter(H,m;img_h_f

11、iltered = cat(3,h_filtered,S,I;rgb_h_filtered = hsi2rgb(img_h_filtered;subplot(3,3,2;imshow(rgb_h_filtered; title('H分量模糊后'imwrite(rgb_h_filtered, 'H分量模糊后.jpg'%拉普拉斯lapMatrix=1 1 1;1 -8 1;1 1 1;i_tmp=imfilter(H,lapMatrix,'replicate'H_sharped=imsubtract(H,i_tmp;img_h_sharped = c

12、at(3,H_sharped,S,I;rgb_h_sharped = hsi2rgb(img_h_sharped;subplot(3,3,3; imshow(rgb_h_sharped; title('H分量銳化后' imwrite(rgb_h_sharped, 'H分量銳化后.jpg'subplot(3,3,4;imshow(fc; title('原圖'%平滑濾波m=fspecial('average',8,8;s_filtered=imfilter(S,m;img_s_filtered = cat(3,H,s_filtered

13、,I;rgb_s_filtered = hsi2rgb(img_s_filtered;subplot(3,3,5;imshow(rgb_s_filtered; title('S分量模糊后' imwrite(rgb_s_filtered, 'S分量模糊后.jpg'%拉普拉斯lapMatrix=1 1 1;1 -8 1;1 1 1;i_tmp=imfilter(S,lapMatrix,'replicate's_sharped=imsubtract(S,i_tmp;img_s_sharped = cat(3,H,s_sharped,I;rgb_s_sh

14、arped = hsi2rgb(img_s_sharped;subplot(3,3,6; imshow(rgb_s_sharped; title('S分量銳化后' imwrite(rgb_s_sharped, 'S分量銳化后.jpg'subplot(3,3,7;imshow(fc; title('原圖'%平滑濾波m=fspecial('average',8,8;i_filtered=imfilter(I,m;img_i_filtered = cat(3,H,S,i_filtered;rgb_i_filtered = hsi2rgb(img_i_filtered;subplot(3,3,8;imshow(rgb_i_filtered; title('I分量模糊后' imwrite(rgb_i_filtered, 'I分量模糊后.jpg'%拉普拉斯lapMatrix=1 1 1;1 -8 1;1 1 1;i_tmp=imfilter(I,lapMatrix,'replicate'