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1、WORD.23/23附录MATLAB图像处理工具箱函数表1 通用函数函数功能语法colorbar显示颜色条colorbarcolorbar(.,peer,axes_handle)colorbar(axes_handle)colorbar(location)colorbar(.,PropertyName,propertyvalue)cbar_axes = colorbar(.)getimage从坐标轴取得图像数据A = getimage(h)x,y,A = getimage(h).,A,flag = getimage(h). = getimageimage创建并显示图像对象image(C)ima
2、ge(x,y,C)image(.,PropertyName,PropertyValue,.)image(PropertyName,PropertyValue,.) Formal syntax - PN/PV onlyhandle = image(.)imagesc按图像显示数据矩阵imagesc(C)imagesc(x,y,C)imagesc(.,clims)h = imagesc(.)imshow显示图像imshow(I,n)imshow(I,low high)imshow(BW)imshow(X,map)imshow(RGB)imshow(,display_option)imshow(x,
3、y,A,)imshow filenameh = imshow()imview利用图像浏览器显示图像imview(I)imview(RGB)imview(X,map)imview(I,range)imview(filename)imview(.,InitialMagnification,initial_mag)h = imview(.)imview close allmontage在矩形框中同时显示多帧图像montage(I)montage(BW)montage(X,map)montage(RGB)h = montage(.)immovie创建多帧索引色图像的电影动画mov = immovie(
4、X,map)mov = immovie(RGB)subimage在一个图形中显示多个图像,结合函数subplot使用subimage(X,map)subimage(I)subimage(BW)subimage(RGB)subimage(x,y,.)h = subimage(.)truesize调整图像显示尺寸truesize(fig,mrows mcols)truesize(fig)wrap将图像显示到纹理映射表面warp(X,map)warp(I,n)warp(BW)warp(RGB)warp(z,.)warp(x,y,z,.)h = warp(.)zoom缩放图像或图形zoom on zo
5、om offzoom outzoom resetzoomzoom xonzoom yonzoom(factor)zoom(fig, option)表2 图像文件I/O函数函数功能语法imfinfo返回图像文件信息info = imfinfo(filename,fmt)info = imfinfo(filename)imread从图像文件中读取图像A = imread(filename,fmt)X,map = imread(filename,fmt). = imread(filename). = imread(URL,.). = imread(.,idx) (CUR, GIF, ICO, and
6、 TIFF only). = imread(.,PixelRegion,ROWS, COLS) (TIFF only). = imread(.,frames,idx) (GIF only). = imread(.,ref) (HDF only). = imread(.,BackgroundColor,BG) (PNG only)A,map,alpha = imread(.) (ICO, CUR, and PNG only)imwrite把图像写入图像文件中imwrite(A,filename,fmt)imwrite(X,map,filename,fmt)imwrite(.,filename)i
7、mwrite(.,Param1,Val1,Param2,Val2.)表3 空间变换函数函数功能语法findbounds为空间变换寻找输出边界outbounds = findbounds(TFORM,inbounds)fliptform切换空间变换结构的输入和输出角色TFLIP = fliptform(T)imcrop剪切图像I2 = imcrop(I)X2 = imcrop(X,map)RGB2 = imcrop(RGB)I2 = imcrop(I,rect)X2 = imcrop(X,map,rect)RGB2 = imcrop(RGB,rect). = imcrop(x,y,.)A,rec
8、t = imcrop(.)x,y,A,rect = imcrop(.)imresize图像缩放B = imresize(A,m)B = imresize(A,m,method)B = imresize(A,mrows ncols,method)B = imresize(.,method,n)B = imresize(.,method,h)imrotate图像旋转B = imrotate(A,angle)B = imrotate(A,angle,method)B = imrotate(A,angle,method,bbox)interp22-D数据插值ZI = interp2(X,Y,Z,XI,
9、YI)ZI = interp2(Z,XI,YI)ZI = interp2(Z,ntimes)ZI = interp2(X,Y,Z,XI,YI,method)imtransform对图像进行2-D空间变换B = imtransform(A,TFORM)B = imtransform(A,TFORM,INTERP)B,XDATA,YDATA = imtransform(.)B,XDATA,YDATA = imtransform(.,param1,val1,param2,val2,.)makeresampler生成重采样结构R = makeresampler(interpolant,padmetho
10、d)maketform生成几何变换结构T = maketform(transformtype,.)tformarray多维数组的空间变换B = tformarray(A,T,R,TDIMS_A,TDIMS_B,TSIZE_B,TMAP_B,F)tformfwd正向空间变换X,Y = tformfwd(T,U,V)X1,X2,X3,. = tformfwd(T,U1,U2,U3,.)X = tformfwd(T,U)X1,X2,X3,. = tformfwd(T,U)X = tformfwd(T,U1,U2,U3,.)tforminv逆向空间变换U = tforminv(X,T)表4 像素和统计
11、处理函数函数功能语法corr2计算两个矩阵的2-D相关系数r = corr2(A,B)imcontour创建图像的轮廓图imcontour(I)imcontour(I,n)imcontour(I,v)imcontour(x,y,.)imcontour(.,LineSpec)C,h = imcontour(.)imhist显示图像的直方图imhist(I,n)imhist(X,map)counts,x = imhist(.)impixel确定像素颜色值P = impixel(I)P = impixel(X,map)P = impixel(RGB)P = impixel(I,c,r)P = imp
12、ixel(X,map,c,r)P = impixel(RGB,c,r)c,r,P = impixel(.)P = impixel(x,y,I,xi,yi)P = impixel(x,y,X,map,xi,yi)P = impixel(x,y,RGB,xi,yi)xi,yi,P = impixel(x,y,.)improfile沿线段计算剖面图的像素值c = improfilec = improfile(n)c = improfile(I,xi,yi)c = improfile(I,xi,yi,n)cx,cy,c = improfile(.)cx,cy,c,xi,yi = improfile(.
13、). = improfile(x,y,I,xi,yi). = improfile(x,y,I,xi,yi,n). = improfile(.,method)mean2求矩阵元素平均值B = mean2(A)pixval显示图像像素信息pixval onpixval offpixvalpixval(fig,option)pixval(ax,option)pixval(H,option)regionprops得到图像区域属性STATS = regionprops(L,properties)std2计算矩阵元素的标准偏移b = std2(A)表5 图像分析函数函数功能语法edge识别灰度图像中的边界
14、BW = edge(I,sobel)BW = edge(I,sobel,thresh)BW = edge(I,sobel,thresh,direction)BW,thresh = edge(I,sobel,.)BW = edge(I,prewitt)BW = edge(I,prewitt,thresh)BW = edge(I,prewitt,thresh,direction)BW,thresh = edge(I,prewitt,.)BW = edge(I,roberts)BW = edge(I,roberts,thresh)BW,thresh = edge(I,roberts,.)BW = e
15、dge(I,log)BW = edge(I,log,thresh)BW = edge(I,log,thresh,sigma)BW,threshold = edge(I,log,.)qtdecomp执行四叉树分解S = qtdecomp(I)S = qtdecomp(I,threshold)S = qtdecomp(I,threshold,mindim)S = qtdecomp(I,threshold,mindim maxdim)S = qtdecomp(I,fun)S = qtdecomp(I,fun,P1,P2,.)qtgetblk获取四叉树分解中的数组块值vals,r,c = qtgetb
16、lk(I,S,dim)vals,idx = qtgetblk(I,S,dim)qtsetblk设置四叉树分解中的数组块值J = qtsetblk(I,S,dim,vals)表6 图像增强函数函数功能语法adapthisteq执行对比度受限的直方图均衡J = adapthisteq(I)J = adapthisteq(I,param1,val1,param2,val2.)decorrstretch对多通道图像应用解卷积延拓S = decorrstretch(I)S = decorrstretch(I,TOL)histeq用直方图均等化增强对比度J = histeq(I,hgram)J = his
17、teq(I,n)J,T = histeq(I,.)newmap = histeq(X,map,hgram)newmap = histeq(X,map)newmap,T = histeq(X,.)imadjust调整图像灰度值或颜色映射表J = imadjust(I)J = imadjust(I,low_in; high_in,low_out; high_out)J = imadjust(.,gamma)newmap = imadjust(map,low_in high_in,low_out high_out,gamma)RGB2 = imadjust(RGB1,.)imnoise向图像中加入噪
18、声J = imnoise(I,type)J = imnoise(I,type,parameters)medfilt2进行二维中值滤波B = medfilt2(A,m n)B = medfilt2(A)B = medfilt2(A,indexed,.)ordfilt2进行二维统计顺序滤波B = ordfilt2(A,order,domain)B = ordfilt2(A,order,domain,S)B = ordfilt2(.,padopt)stretchlim得到图像对比度延拓的灰度上下限LOW_HIGH = stretchlim(I,TOL)LOW_HIGH = stretchlim(RG
19、B,TOL)wiener2进行二维适应性去噪滤波J = wiener2(I,m n,noise)J,noise = wiener2(I,m n)表7 线性滤波函数函数功能语法conv2二维卷积C = conv2(A,B)C = conv2(hcol,hrow,A)C = conv2(.,shape)convmtx2二维矩阵卷积T = convmtx2(H,m,n)T = convmtx2(H,m n)convnn维卷积C = convn(A,B)C = convn(A,B,shape)filter2二维线性滤波Y = filter2(h,X)Y = filter2(h,X,shape)fspe
20、cial创建预定义滤波器h = fspecial(type)h = fspecial(type,parameters)imfilter多维图像滤波B = imfilter(A,H)B = imfilter(A,H,option1,option2,.)表8 线性二维滤波器设计函数函数功能语法freqspace确定二维频率响应的频率空间f1,f2 = freqspace(n)f1,f2 = freqspace(m n)x1,y1 = freqspace(.,meshgrid)f = freqspace(N)f = freqspace(N,whole)freqz2计算二维频率响应H,f1,f2 =
21、freqz2(h,n1,n2)H,f1,f2 = freqz2(h,n2 n1)H,f1,f2 = freqz2(h)H,f1,f2 = freqz2(h,f1,f2). = freqz2(h,.,dx dy). = freqz2(h,.,dx)freqz2(.)fsamp2用频率采样法设计二维FIR滤波器h = fsamp2(Hd)h = fsamp2(f1,f2,Hd,m n)ftrans2通过频率转换法设计二维FIR滤波器h = ftrans2(b,t)h = ftrans2(b)fwind1用一维窗口方法设计二维FIR滤波器h = fwind1(Hd,win)h = fwind1(Hd
22、,win1,win2)h = fwind1(f1,f2,Hd,.)fwind2用二维窗口方法设计二维FIR滤波器h = fwind2(Hd,win)h = fwind2(f1,f2,Hd,win)表9 图像变换函数函数功能语法dct2进行二维离散余弦变换B = dct2(A)B = dct2(A,m,n)B = dct2(A,m n)dctmtx计算离散余弦变换矩阵D = dctmtx(n)fft2进行二维快速傅立叶变换Y = fft2(X)Y = fft2(X,m,n)fftn进行n维快速傅立叶变换Y = fftn(X)Y = fftn(X,siz)fftshift转换快速傅立叶变换的输出象
23、限Y = fftshift(X)Y = fftshift(X,dim)idct2计算二维逆离散余弦变换B = idct2(A)B = idct2(A,m,n)B = idct2(A,m n)ifft2计算二维逆快速傅立叶变换Y = ifft2(X)Y = ifft2(X,m,n)y = ifft2(., nonsymmetric)y = ifft2(., nonsymmetric)ifftn计算n维逆快速傅立叶变换Y = ifftn(X)Y = ifftn(X,siz)y = ifftn(., nonsymmetric)y = ifftn(., nonsymmetric)iradon逆Rado
24、n变换I = iradon(R,theta)I = iradon(R,theta,interp,filter,frequency_scaling,output_size)I,H = iradon(.)phantom产生一个头部幻影图像P = phantom(def,n)P = phantom(E,n)P,E = phantom(.)radon计算Radon变换R=radon(I,theta)R,xp=radon()fanbeam计算扇形投影变换F = fanbeam(I,D)F = fanbeam(.,param1,val1,param1,val2,.)F,sensor_positions,f
25、an_rotation_angles = fanbeam(.)表10 边沿和块处理函数函数功能语法bestblk确定进行块操作的块大小siz = bestblk(m n,k)mb,nb = bestblk(m n,k)blkproc实现图像的非重叠(distinct)块操作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,.)col2im将矩阵的列重新组织到块中A = col2im(B,m n,mm nn, block_t
26、ype)A = col2im(B,m n,mm nn)colfilt利用列相关函数进行边沿操作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,.)im2col重调图像块为列B = im2col(A,m n,block_type)B = im2col(A,m n)B = im2col(A,indexed,.)nlfilter通用滑动邻域操作B = nlfil
27、ter(A,m n,fun)B = nlfilter(A,m n,fun,P1,P2,.)B = nlfilter(A,indexed,.)表11图像形态学操作函数函数功能语法applylut在二值图像中利用查找表进行邻域操作A = applylut(BW,LUT)bwarea计算二值图像的对象面积total = bwarea(BW)bweuler计算二值图像的欧拉数eul = bweuler(BW,n)bwhitmiss执行二值图像的击中和击不中操作BW2 = bwhitmiss(BW1,SE1,SE2)BW2 = bwhitmiss(BW1,INTERVAL)bwlabel标注二值图像中已
28、连接的部分L = bwlabel(BW,n)L,num = bwlabel(BW,n)bwmorph二值图像的通用形态学操作BW2 = bwmorph(BW,operation)BW2 = bwmorph(BW,operation,n)bwperim计算二值图像中对象的周长BW2 = bwperim(BW1)BW2 = bwperim(BW1,CONN)bwselect在二值图像中选择对象BW2 = bwselect(BW,c,r,n)BW2 = bwselect(BW,n)BW2,idx = bwselect(.)BW2 = bwselect(x,y,BW,xi,yi,n)x,y,BW2,i
29、dx,xi,yi = bwselect(.)makelut创建用于applylut函数的查找表lut = makelut(fun,n)lut = makelut(fun,n,P1,P2,.)bwdist距离变换D = bwdist(BW)D,L = bwdist(BW)D,L = bwdist(BW,METHOD)imbothat执行形态学的闭包运算IM2 = imbothat(IM,SE)IM2 = imbothat(IM,NHOOD)imclose图像的闭运算IM2 = imclose(IM,SE)IM2 = imclose(IM,NHOOD)imopen图像的开运算IM2 = imope
30、n(IM,SE)IM2 = imopen(IM,NHOOD)imdilate图像的膨胀IM2 = imdilate(IM,SE)IM2 = imdilate(IM,NHOOD)IM2 = imdilate(IM,SE,PACKOPT)IM2 = imdilate(.,PADOPT)imerode图像的腐蚀IM2 = imerode(IM,SE)IM2 = imerode(IM,NHOOD)IM2 = imerode(IM,SE,PACKOPT,M)IM2 = imerode(.,PADOPT)imfill填充图像区域BW2 = imfill(BW,locations)BW2 = imfill(
31、BW,holes)I2 = imfill(I)BW2 = imfill(BW)BW2 locations = imfill(BW)BW2 = imfill(BW,locations,CONN)BW2 = imfill(BW,CONN,holes)I2 = imfill(I,CONN)imtophat用开运算后的图像减去原图像IM2 = imtophat(IM,SE)IM2 = imtophat(IM,NHOOD)strel创建形态学结构元素SE = strel(shape,parameters)表12 区域处理函数函数功能语法roicolor选择感兴趣的颜色区BW = roicolor(A,l
32、ow,high)BW = roicolor(A,v)roifill在图像的任意区域中进行平滑插补J = roifill(I,c,r)J = roifill(I)J = roifill(I,BW)J,BW = roifill(.)J = roifill(x,y,I,xi,yi)x,y,J,BW,xi,yi = roifill(.)roifilt2滤波特定区域J = roifilt2(h,I,BW)J = roifilt2(I,BW,fun)J = roifilt2(I,BW,fun,P1,P2,.)roipoly选择一个感兴趣的多边形区域BW = roipoly(I,c,r)BW = roipo
33、ly(I)BW = roipoly(x,y,I,xi,yi)BW,xi,yi = roipoly(.)x,y,BW,xi,yi = roipoly(.)表13 图像代数操作函数功能语法imadd加运算Z = imadd(X,Y)imsubtract减运算Z = imsubtract(X,Y)immultiply乘运算Z = immultiply(X,Y)imdivide除运算Z = imdivide(X,Y)表14 颜色空间转换函数函数功能语法hsv2rgb转换HSV的值为RGB颜色空间M = hsv2rgb(H)ntsc2rgb转换NTSC的值为RGB颜色空间rgbmap = ntsc2rg
34、b(yiqmap)RGB = ntsc2rgb(YIQ)rgb2hsv转换RGB的值为HSV颜色空间cmap = rgb2hsv(M)rgb2ntsc转换RGB的值为NTSC颜色空间yiqmap = rgb2ntsc(rgbmap)YIQ = rgb2ntsc(RGB)rgb2ycbcr转换RGB的值为YCbCr颜色空间ycbcrmap = rgb2ycbcr(rgbmap)YCBCR = rgb2ycbcr(RGB)ycbcr2rgb转换YCbCr的值为RGB颜色空间rgbmap = ycbcr2rgb(ycbcrmap)RGB = ycbcr2rgb(YCBCR)表15 图像类型和类型转换
35、函数函数功能语法dither通过抖动增加外观颜色分辨率,转换图像X = dither(RGB,map)BW = dither(I)gray2ind转换灰度图像为索引色图像X,map = gray2ind(I,n)X,map = gray2ind(BW,n)grayslice从灰度图像为索引色图像X = grayslice(I,n)X = grayslice(I,v)im2bw转换图像为二值图像BW = im2bw(I,level)BW = im2bw(X,map,level)BW = im2bw(RGB,level)im2double转换图像矩阵为双精度类型I2 = im2double(I)R
36、GB2 = im2double(RGB)I = im2double(BW)X2 = im2double(X,indexed)double转换数据为双精度类型double(X)uint8转换数据为8位无符号整型I = uint8(X)im2uint8转换图像阵列为8位为无符号整型I2 = im2uint8(I)RGB2 = im2uint8(RGB)I = im2uint8(BW)X2 = im2uint8(X,indexed)im2uint16转换图像阵列为16位为无符号整型I2 = im2uint16(I)RGB2 = im2uint16(RGB)I = im2uint16(BW)X2 = im2uint16(X,indexed)uint16转换数据为16位无符号整型I = uint16(X)ind2gray转换索引色图像为灰度图像I = ind2gray(X,map)ind2rgb转换索引色图像为
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