MATLAB第4章圖像處理1課件

1、第4章 Matlab7.0的圖像處理基本操作4.1 圖像的代數(shù)運(yùn)算4.2 圖像的幾何運(yùn)算4.1 圖像的代數(shù)運(yùn)算4.1.1 相加運(yùn)算imadd兩幅圖像疊加：I和J圖像矩陣的大小和類型相同，也就是維數(shù)要相同。I = imread(rice.png);J = imread(cameraman.tif);K = imadd(I,J,uint16); subplot(2,2,1), imshow(I)subplot(2,2,2), imshow(J)subplot(2,2,3), imshow(K,)圖像整體亮度增加：一個(gè)圖像和一個(gè)常數(shù)的求和。I = imread(rice.png);J=imadd(I

2、, 50);subplot(1,2,1), imshow(I)subplot(1,2,2), imshow(J)4.1.2 減法運(yùn)算imsubtract兩幅圖像相減I = imread(rice.png);J=imread(cameraman.tif);Iq = imsubtract(I,J);subplot(2,2,1), imshow(I)subplot(2,2,2), imshow(J)subplot(2,2,3), imshow(Iq)圖像整體亮度減小I = imread(rice.png);J=imsubtract(I, 50);subplot(1,2,1), imshow(I)su

3、bplot(1,2,2), imshow(J)4.1.3 乘法運(yùn)算immultiply亮度縮放I = imread(moon.tif);J = immultiply(I,0.5);K = immultiply(I,2);subplot(1,3,1), imshow(I)subplot(1,3,2), imshow(J)subplot(1,3,3), imshow(K)兩幅圖像相乘(通常無意義)I = imread(cameraman.tif); I16=uint16(I);J=imread(rice.png); J16=uint16(J);Iq = immultiply(I16,J16);im

4、show(Iq,)4.1.4 除法運(yùn)算imdivide亮度縮放I = imread(moon.tif);J = imdivide(I,0.5);K = imdivide(I,2);subplot(1,3,1), imshow(I)subplot(1,3,2), imshow(J)subplot(1,3,3), imshow(K)兩幅圖像相除I = imread(cameraman.tif); I16=uint16(I);J=imread(rice.png); J16=uint16(J);Iq = imdivide(I16,J16);imshow(Iq,)4.2.1 圖像插值最近鄰插值：最近采樣

5、點(diǎn)雙線性插值：2*2雙三次線性插值：4*44.2.2 圖像縮放imresize()imresize(A,m,method)imresize(A,mrows ncols,method)methodnearest(默認(rèn))：最近鄰插值bilinear:雙線性插值bicubic:三線性插值4.2.3 圖像旋轉(zhuǎn)imrotate(A,angle,method):逆時(shí)針I(yè)=imread(cameraman.tif);J=imrotate(I,45,bilinear);figure,imshow(I)figure,imshow(J)4.2.4 圖像切割imcrop(A,rect)rect:x y width heightI = imrea