附录MATLAB图像处理命令1.applylut功能:在二进制图像中利用lookup表进行边沿操作。
语法:A = applylut(BW,lut)举例lut = makelut('sum(x(:)) == 4',2);BW1 = imread('text.tif');BW2 = applylut(BW1,lut);imshow(BW1)figure, imshow(BW2)相关命令:makelut2.bestblk功能:确定进行块操作的块大小。
语法:siz = bestblk([m n],k)[mb,nb] = bestblk([m n],k)举例siz = bestblk([640 800],72)siz =6450MATLAB高级应用——图形及影像处理330相关命令:blkproc3.blkproc功能:实现图像的显式块操作。
语法:B = blkproc(A,[m n],fun)B = blkproc(A,[m n],fun,P1,P2,...)B = blkproc(A,[m n],[mborder nborder],fun,...)B = blkproc(A,'indexed',...)举例I = imread('alumgrns.tif');I2 = blkproc(I,[8 8],'std2(x)*ones(size(x))');imshow(I)figure, imshow(I2,[]);相关命令:colfilt, nlfilter,inline4.brighten功能:增加或降低颜色映像表的亮度。
语法:brighten(beta)newmap = brighten(beta)newmap = brighten(map,beta)brighten(fig,beta)相关命令:附录MATLAB图像处理命令329imadjust, rgbplot5.bwarea功能:计算二进制图像对象的面积。
语法:total = bwarea(BW)举例BW = imread('circles.tif');imshow(BW);bwarea(BW)ans =15799相关命令:bweuler, bwperim6.bweuler.功能:计算二进制图像的欧拉数。
语法:eul = bweuler(BW,n)举例BW = imread('circles.tif');imshow(BW);bweuler(BW)ans =–2MATLAB高级应用——图形及影像处理330相关命令:bwmorph, bwperim7.bwfill功能:填充二进制图像的背景色。
语法:BW2 = bwfill(BW1,c,r,n)BW2 = bwfill(BW1,n)[BW2,idx] = bwfill(...)BW2 = bwfill(x,y,BW1,xi,yi,n)[x,y,BW2,idx,xi,yi] = bwfill(...)BW2 = bwfill(BW1,'holes',n)[BW2,idx] = bwfill(BW1,'holes',n)举例BW1 =[1 0 0 0 0 0 0 01 1 1 1 1 0 0 01 0 0 0 1 0 1 01 0 0 0 1 1 1 01 1 1 1 0 1 1 11 0 0 1 1 0 1 01 0 0 0 1 0 1 01 0 0 0 1 1 1 0]BW2 = bwfill(BW1,3,3,8)BW2 =1 0 0 0 0 0 0 01 1 1 1 1 0 0 01 1 1 1 1 0 1 01 1 1 1 1 1 1 01 1 1 1 0 1 1 11 0 0 1 1 0 1 01 0 0 0 1 0 1 01 0 0 0 1 1 1 0I = imread('blood1.tif');附录MATLAB图像处理命令329 BW3 = ~im2bw(I);BW4 = bwfill(BW3,'holes');imshow(BW3)figure, imshow(BW4)相关命令:bwselect, roifill8.bwlabel功能:标注二进制图像中已连接的部分。
语法:L = bwlabel(BW,n)[L,num] = bwlabel(BW,n)举例BW = [1 1 1 0 0 0 0 01 1 1 0 1 1 0 01 1 1 0 1 1 0 01 1 1 0 0 0 1 01 1 1 0 0 0 1 01 1 1 0 0 0 1 01 1 1 0 0 1 1 01 1 1 0 0 0 0 0]L = bwlabel(BW,4)L =1 1 1 0 0 0 0 01 1 1 02 2 0 01 1 1 02 2 0 01 1 1 0 0 0 3 0MATLAB高级应用——图形及影像处理3301 1 1 0 0 0 3 01 1 1 0 0 0 3 01 1 1 0 0 3 3 01 1 1 0 0 0 0 0[r,c] = find(L==2);rc = [r c]rc =2 53 52 63 6相关命令:bweuler, bwselect9.bwmorph功能:提取二进制图像的轮廓。
语法:BW2 = bwmorph(BW1,operation)BW2 = bwmorph(BW1,operation,n) 举例BW1 = imread('circles.tif');imshow(BW1);BW2 = bwmorph(BW1,'remove');BW3 = bwmorph(BW1,'skel',Inf);imshow(BW2)附录MATLAB图像处理命令329 figure, imshow(BW3)相关命令:bweuler, bwperim, dilate, erode10.bwperim功能:计算二进制图像中对象的周长。
语法:BW2 = bwperim(BW1,n)举例BW1 = imread('circbw.tif');BW2 = bwperim(BW1,8);imshow(BW1)figure, imshow(BW2)相关命令:bwarea, bweuler, bwfillMATLAB高级应用——图形及影像处理33011.bwselect功能:在二进制图像中选择对象。
语法:BW2 = bwselect(BW1,c,r,n)BW2 = bwselect(BW1,n)[BW2,idx] = bwselect(...)举例BW1 = imread('text.tif');c = [16 90 144];r = [85 197 247];BW2 = bwselect(BW1,c,r,4);imshow(BW1)figure, imshow(BW2)相关命令:bwfill, bwlabel, impixel, roipoly, roifill 12.cmpermute功能:调整颜色映像表中的颜色。
语法:[Y,newmap] = cmpermute(X,map)[Y,newmap] = cmpermute(X,map,index) 举例To order a colormap by luminance, use:ntsc = rgb2ntsc(map);附录MATLAB图像处理命令329 [dum,index] = sort(ntsc(:,1));[Y,newmap] = cmpermute(X,map,index);相关命令:randperm13.cmunique功能:查找颜色映像表中特定的颜色及相应的图像。
语法:[Y,newmap] = cmunique(X,map)[Y,newmap] = cmunique(RGB)[Y,newmap] = cmunique(I)相关命令:gray2ind, rgb2ind14.col2im功能:将矩阵的列重新组织到块中。
语法:A = col2im(B,[m n],[mm nn],block_type)A = col2im(B,[m n],[mm nn])相关命令:blkproc, colfilt, im2col, nlfilter15.colfilt功能:利用列相关函数进行边沿操作。
语法:B = colfilt(A,[m n],block_type,fun)B = colfilt(A,[m n],block_type,fun,P1,P2,...)B = colfilt(A,[m n],[mblock nblock],block_type,fun,...)B = colfilt(A,'indexed',...)相关命令:blkproc, col2im, im2col, nlfilterMATLAB高级应用——图形及影像处理33016.colorbar功能:显示颜色条。
语法:colorbar('vert')colorbar('horiz')colorbar(h)colorbarh = colorbar(...)举例I = imread('blood1.tif');h = fspecial('log');I2 = filter2(h,I);imshow(I2,[]), colormap(jet(64)), colorbar17.conv2功能:进行二维卷积操作。
语法:C = conv2(A,B)C = conv2(hcol,hrow,A)C = conv2(...,shape)举例A = magic(5)A =17 24 1 8 15附录MATLAB图像处理命令32923 5 7 14 164 6 13 20 2210 12 19 21 311 18 25 2 9B = [1 2 1;0 2 0;3 1 3]B =1 2 10 2 03 1 3C = conv2(A,B)C =17 58 66 34 32 38 1523 85 88 35 67 76 1655 149 117 163 159 135 6779 78 160 161 187 129 5123 82 153 199 205 108 7530 68 135 168 91 84 933 65 126 85 104 15 27相关命令:filter218.convmtx2功能:计算二维卷积矩阵。
语法:T = convmtx2(H,m,n)T = convmtx2(H,[m n])相关命令:conv219.convn功能:计算n维卷积。